- civil engineeredit
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Indonesia is the right area to develop bamboo as a construction material because this country is a well-known bamboo producing country in the Asia-Pacific region. One of the bamboo species that can be studied is Bambusa vulgaris because... more
Indonesia is the right area to develop bamboo as a construction material because this country is a well-known bamboo producing country in the Asia-Pacific region. One of the bamboo species that can be studied is Bambusa vulgaris because this species grows in almost all parts of Indonesia. This study focused on Finite Element simulation to calculate the compressive strength and tensile strength of Bambusa vulgaris sourced from Deli Serdang, Langkat, and Sedang Bedagai district. The results of the strength obtained from the simulation will be compared with the results from the previous study with the same species and the same location, to see the reliability of the model simulation with software. From simulation results, it is found that the compressive strength is 46.70 MPa, 58.33 MPa, and 47.65 MPa. For tensile strength, the results obtained from the simulation are 194.08 MPa, 182.49 MPa, and 156.44 MPa.The difference given between the simulation result and the test results in previous studies for compressive strength is 5.38 – 10,09% and for tensile strength is 1,96 – 9,39%. This result indicates that simulation with Finite Element Analysis can provide results that are sufficiently close to a laboratory test.
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Cement is a concrete constituent material that has a great influence on concrete quality, both normal and high-quality concrete. High quality concrete in SNI 03-6468-2000 is defined as concrete which has compressive strength... more
Cement is a concrete constituent material that has a great influence on concrete quality, both normal and high-quality concrete. High quality concrete in SNI 03-6468-2000 is defined as concrete which has compressive strength characteristics above 41.4 MPa. During the process, cement produces gas emissions obtained from combustion, calcination of limestone, and the use of electrical energy. The purpose of using cement in the preparation of concrete itself is as a binder between aggregates. Nowadays, commonly used cement (OPC cement) can be replaced with slag cement. Slag cement is the result of the addition of Granulated Blast Furnace Slag into the final grinding of cement which is a waste product from the steel ore smelting process. This research is comparing the magnitude of the tensile strength and the modulus of elasticity of the samples with 100% OPC cement and those with 100% slag cement. The samples used were cylinders with 15 cm diameter and 30 cm height. The tests were carried out when the concrete reaches 90 days age. The curing of the samples was carried out with four variations which is by submerging those in tap water, Kuala Tanjung sea water, Sulphuric Acid water, and compound curing. The results of this test were obtained if the slag cement-used concrete is able to have a tensile strength that is almost the same as OPC cement-used concrete which is 4.341 MPa for normal concrete and 4.293 MPa for slag concrete and its modulus of elasticity of 46103.67 MPa for normal concrete and 46892.82 MPa for slag concrete.
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Damages that often emerge in concrete include cracks, delamination, spalling, wear, fracture, porous, voids (perforated). These damages need to be repaired, one of which is by patch repair. With consideration of strength and frugality, a... more
Damages that often emerge in concrete include cracks, delamination, spalling, wear, fracture, porous, voids (perforated). These damages need to be repaired, one of which is by patch repair. With consideration of strength and frugality, a self-made repair material was developed using mortar as a base material, i.e., geopolymer mortar. Geopolymer mortar is a mortar with natural materials and materials that have a high content of silica oxide and alumina (such as Fly Ash and GGBFS) as a binder that must be activated with an alkaline activator in the form of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). The use of Fly Ash and GGBFS as a binder to replace cement in geopolymer mortar has a positive impact from an environmental point of view because it can reduce the use of cement and can reduce environmental pollution due to Fly Ash and GGBFS waste. In this research, the effect of variations in Fly Ash and GGBFS and variations in the molarity of NaOH on the compressive strength o...
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Cement is a concrete constituent material that has a great influence on concrete quality, both normal and high-quality concrete. High quality concrete in SNI 03-6468-2000 is defined as concrete which has compressive strength... more
Cement is a concrete constituent material that has a great influence on concrete quality, both normal and high-quality concrete. High quality concrete in SNI 03-6468-2000 is defined as concrete which has compressive strength characteristics above 41.4 MPa. During the process, cement produces gas emissions obtained from combustion, calcination of limestone, and the use of electrical energy. The purpose of using cement in the preparation of concrete itself is as a binder between aggregates. Nowadays, commonly used cement (OPC cement) can be replaced with slag cement. Slag cement is the result of the addition of Granulated Blast Furnace Slag into the final grinding of cement which is a waste product from the steel ore smelting process. This research is comparing the magnitude of the tensile strength and the modulus of elasticity of the samples with 100% OPC cement and those with 100% slag cement. The samples used were cylinders with 15 cm diameter and 30 cm height. The tests were carri...
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Based on PP. No.85 of 1999 on the management of hazardous and toxic (B3), fly ash and bottom ash wastes are categorized into B3 waste because there are heavy metal oxide contents that can pollute the environment. One form of environmental... more
Based on PP. No.85 of 1999 on the management of hazardous and toxic (B3), fly ash and bottom ash wastes are categorized into B3 waste because there are heavy metal oxide contents that can pollute the environment. One form of environmental rescue that can be applied is to utilize waste fly ash and bottom ash in the manufacture of concrete. In this research, fly ash and bottom ash waste are used as substitution of cement and fine aggregate to make lightweight concrete. The purpose of this research is to know the mechanical properties of non-autoclaved aerated lightweight concrete (NAAC) with FA and BA substitution to cement and fine aggregate which is expected to improve the quality of concrete. The NAAC lightweight concrete in this study is divided into 4 categories: normal NAAC lightweight concrete, NAAC lightweight NAAC substituted concrete with FA, NAAC lightweight concrete substituted with BA, and NAAC combined light weight from FA and BA with variations of 10%, 20% And 30%. The test specimen used in cylindrical shape, which was tested at the age of 28 days, amounted to 90 pieces and consisted of 10 variations. Each variation amounted to 9 samples. Based on the test results with FA and BA substitutions of 10%, 20%, and 30%, the highest compressive strength was achieved in samples with FA 30% of 12.687 MPa, maximum tensile strength achieved in samples with FA 30% of 1,540 MPa, The highest absorption was achieved in normal NAAC of 5.66%. Based on the weight of the contents of all samples, samples can be categorized in lightweight concrete, since the weight of the contents is less than 1900 kg / m3.
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Volcanic ash obtained from Mount Sinabung is an aluminosilicate material that is generally available deposited in the land of Sinabung. The study focuses to investigate the effect of volcanic ash as partial replacement of... more
Volcanic ash obtained from Mount Sinabung is an aluminosilicate material that is generally available deposited in the land of Sinabung. The study focuses to investigate the effect of volcanic ash as partial replacement of ground-granulated blast-furnace slag (GGBFS) based alkaline activated mortar (AAM) in varying six ratios from 10 wt.% to 60 wt.% in terms of the compressive strength (CS) and structural characteristics. The six-mixture design of AAM was conducted with addition of alkaline activator solution (AAS) to solid material. The AAS were prepared from a combination of 10 M NaOH and Na2SiO3, whereas, solid materials consisted of GGBFS, VA and fine aggregates. The results of the experiments were analysed by CS at the age of 7, 28, and 56 days and supported by SEM characterization for the optimum mixture. The results have revealed that the least significant factor in terms of compressive strength value is the addition of volcanic ash content whereby the highest value of 93.50 M...
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The outbreak of Corona Virus Disease 2019 (Covid 19) cases that occurred from 2020 until now limits the current maximum allowed room capacity, which is only around 25% to 50% of the maximum room capacity. The purpose of this study is to... more
The outbreak of Corona Virus Disease 2019 (Covid 19) cases that occurred from 2020 until now limits the current maximum allowed room capacity, which is only around 25% to 50% of the maximum room capacity. The purpose of this study is to design a device that can detect temperature and limit room capacity automatically as an effort to prevent the transmission of the covid 19 virus. In designing a room capacity measuring device and an atmega328 microcontroller-based body temperature detector with a viewer on an android smartphone. The ultrasonic sensor HC-SR04 is used to measure the capacity of the room to determine the number of people entering and leaving. Then this tool also uses the MLX90614 sensor to detect the body temperature of everyone who wants to enter with the temperature conditions below 38°C. When both sensors have worked according to their functions, the doorstop can be opened. The results of the data obtained on each sensor will be sent to the microcontroller as a contr...
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Indonesia is the 9th largest pineapple producer in the world with a production of 1.39 million tons per year. this makes the pineapple leaf fiber (PALF) waste available abundantly in Indonesia. Palf waste has not been widely used in... more
Indonesia is the 9th largest pineapple producer in the world with a production of 1.39 million tons per year. this makes the pineapple leaf fiber (PALF) waste available abundantly in Indonesia. Palf waste has not been widely used in Indonesia. palf is usually used as fabric for textiles or yarn to be used as clothes and as handicrafts. palf has excellent mechanical properties and is environmentally friendly. in this study palf is used as a material for construction. Adding fiber to the concrete mixture is one way to minimize cracks in the concrete. This study aims to increase the compressive strength, tensile strength of concrete and utilize palf potential as construction material. This study compares the compressive strength and tensile strength of normal concrete against compressive strength and tensile strength of concrete with the addition of pineapple fiber with variations of 0%, 0.5 %, 1%, 1.5% to the weight of cement. The specimen used was a cylinder with a diameter of 15cm a...
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Lightweight concrete brick is a brick which made of cement, sand, water, and foam as the basic composition. This brick are divided into 2, based on the foam used such as AAC (Autoclave Aerated Concrete) that use aluminium paste and... more
Lightweight concrete brick is a brick which made of cement, sand, water, and foam as the basic composition. This brick are divided into 2, based on the foam used such as AAC (Autoclave Aerated Concrete) that use aluminium paste and CLC(Cellular Lightweight Concrete) that use foaming agent from BASF as its foaming material. In this trial, the lightweight brick that are ging to be use are the CLC with foaming agent as its foaming material with the mixture of stone ash that are produced by the Stone Crusher with spesific gravity 2666 kg/m3 as their partly sand substitution . In this research, the stone ash variant that are used are 10%, 15%, and 20% from the amount of sand that planned before. After casting, the result of the 10% will receive a reduction of compressive strength while an increasing in absorption as 25.07% and 39.005% and the 15% variant will recieve a reduction of compressive strength as much as 65.8% and a reduction of absorption as much as 17.441% and the 20% variant will recieve a reduction of compressive strength as much as 67.4% while an increasing of absorption as much as 17.956%.
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One key element in that development is concrete. The basic ingredients of concrete is a mixture of cement, water, fine aggregate and coarse aggregate, while the concrete using steel reinforcement called reinforced concrete. The times in... more
One key element in that development is concrete. The basic ingredients of concrete is a mixture of cement, water, fine aggregate and coarse aggregate, while the concrete using steel reinforcement called reinforced concrete. The times in the era of rapid globalization have resulted in increasing number of second-hand goods / waste can be a problem for the existence of life, one of which is the existence of waste steel slag. To that end, much has been done in order to recycle in order to overcome the problem of the existence of this waste. One way is to capitalize upon such waste for purposes that could be used. In this study, the steel slag is used as a substitute or substitutes in normal concrete mix. Variations addition of steel slag at normal concrete to determine the compressive strength and flexural strength better and is expected to improve the quality of the concrete form of the compressive strength and strong bending. The variation of the addition of steel slag used was 0%, 1...
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Wood is the most common forest-based product used in the construction industry, but due to reducing area of forest in the world, substitution materials for wood are needed. Bamboo has a huge prospect for the future as a wood substitute,... more
Wood is the most common forest-based product used in the construction industry, but due to reducing area of forest in the world, substitution materials for wood are needed. Bamboo has a huge prospect for the future as a wood substitute, and extensive and continuous research of bamboo, especially in mechanical properties of bamboo must be carried out to support bamboo as a material substitution for woods. This research focused on the shear strength of bamboo by comparing two types of standard tests used to determine the shear strength of bamboo. The standards are ISO 22517 and ASTM D 143. The compression test to determine the compressive strength is also conducted in this research. The bamboo species that used in this research are the species that grow in various district in the eastern region of Sumatera Utara. The result of the test shows that the highest shear strength for the specimens tested by ISO 22157 standard is Bambusa vulgaris with 6.32 MPa from Asahan and Tanjung Balai, a...
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Many studies have been conducting in providing urban floods solutions to reduce runoff water in various ways. In developing urban areas equipped with drainage systems, where the channel has full capacity and flooding in some urban areas.... more
Many studies have been conducting in providing urban floods solutions to reduce runoff water in various ways. In developing urban areas equipped with drainage systems, where the channel has full capacity and flooding in some urban areas. One of the problems that can be identified is the condition where drainage has a peak flow load at the same hour leading to the same meeting point, outlet, or discharge, resulting in an increase of peak flow. This paper give an approach to how to integrate the runoff capacity of flow from minor drainage to mayor drainage for anticipating a peak flow in a particular area. The most important result was when high rainfall intensity started in the first hour, it should be no obstacles until the flow from minor drainage flow through the outlet towards major drainage, in the four hours after rainfall, peak flow happens to flow through study area. In the analysis, it is known that the peak flood discharge period of 5-yr and 10-yr returns is one hour after ...
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This research explains that the use of superplasticizer admixture as an additional material in concrete mixes is expected to minimize concrete damage due to burning at high temperatures by increasing the quality of concrete in its... more
This research explains that the use of superplasticizer admixture as an additional material in concrete mixes is expected to minimize concrete damage due to burning at high temperatures by increasing the quality of concrete in its mechanical properties which is compressive strength and physical properties which is concrete porosity. The variations in the addition of superplasticizer admixture used are 1%; 1.5%; and 2%, while variations in concrete combustion are 200°C; 500°C; and 800°C.The test results show a decrease in compressive strength and increase in concrete porosity due to combustion at high temperatures. The tendency of concrete compressive strength will decrease along with the increasing temperature. At the temperature of 200°C, a decrease of 7.14%; 40.57%; and 65.71% occurs, at the 500 °C, decreased by 2.74%; 15.07%; and 65.75%, while at 800°C decreased by 13.79%; 14.47%; and 53.95% of the initial strength of concrete without combustion. The porosity of concrete will ris...
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One of the development of concrete technology in construction’s world is Self-Compacting Concrete. Self-Compacting Concrete (SCC) is an innovative concrete that able to “flow” and condensed by gravity and its own weight with little... more
One of the development of concrete technology in construction’s world is Self-Compacting Concrete. Self-Compacting Concrete (SCC) is an innovative concrete that able to “flow” and condensed by gravity and its own weight with little vibration or even without a vibration device at all. However, these concrete still have deficiencies like general concrete that is weak to tensile. To increase the tensile strength of the concrete is by adding fiber into the mix. One type of fiber that can be used as an additive to the mix is Polypropylene fibers. This study aims to determine the effect of adding polypropylene fibers to the mechanical properties and characteristics of SCC concrete and to know the optimal polypropylene fiber content in the manufacture of Self Compacting Concrete. Fiber addition variations are 0 kg / m3; 0.25 kg / m3; 0.5 kg / m3 and 0.75 kg / m3. The result of the research showed that the variation of 0.5 kg / m3 and 0.75 kg / m3 addition of fibers didn’t fulfill the requi...
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... Anggota : 1. Ir. Daniel R. Teruna, MT 2. Prof. Dr. Ing. Johannes Tarigan 3. Dr. Ing. HotmaPanggabean 4. Ir. Sanci Barus, MT Rahmi Karolina : Analisa Dan Kajian Eksperimental Hubungan Momen - Kurvator Pada Balok Beton Bertulang, 2008... more
... Anggota : 1. Ir. Daniel R. Teruna, MT 2. Prof. Dr. Ing. Johannes Tarigan 3. Dr. Ing. HotmaPanggabean 4. Ir. Sanci Barus, MT Rahmi Karolina : Analisa Dan Kajian Eksperimental Hubungan Momen - Kurvator Pada Balok Beton Bertulang, 2008 USU e-Repository © 2008 Page 5. ...
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Concrete is one of the construction materials that have been commonly used for the construction of buildings, bridges, roads and so forth. The need for concrete will increase in line with the increasing need of basic human facilities and... more
Concrete is one of the construction materials that have been commonly used for the construction of buildings, bridges, roads and so forth. The need for concrete will increase in line with the increasing need of basic human facilities and infrastructures. Therefore, the production of cement as a binder of concrete increases as well. In the process of cement production occurs a process of a huge amount of CO2 release into the atmosphere and then damage the environment which among them cause global warming. To overcome these problems, it’s necessary to find another material as a substitute for cement. Geopolymer concrete is an alternative to substitute concrete that uses cement. Geopolymer concrete is made without the use of cement as a concrete binder, and instead, using sinabung ash which is rich in silica and alumina and can react with alkaline liquids to produce a binder. In this research, the flexure strength of concrete is tested to a number of samples in the form of 15x15x60 cm3...
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Pedoman penyusunan modul diklat guru pembelajar bagi guru dan tenaga kependidikan merupakan petunjuk bagi penyelenggara pelatihan di dalam melaksakan pengembangan modul. Pedoman ini disajikan untuk memberikan informasi tentang penyusunan... more
Pedoman penyusunan modul diklat guru pembelajar bagi guru dan tenaga kependidikan merupakan petunjuk bagi penyelenggara pelatihan di dalam melaksakan pengembangan modul. Pedoman ini disajikan untuk memberikan informasi tentang penyusunan modul sebagai salah satu bentuk bahan dalam kegiatan Guru Pembelajar bagi guru dan tenaga kependidikan.
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Mount Sinabung, located in Karo district, North Sumatra, Indonesia is one of the active volcanoes in Indonesia. The eruption of Mount Sinabung produces volcanic smoke and dust. The last eruption that occurred on Friday, 6 April, 2018 with... more
Mount Sinabung, located in Karo district, North Sumatra, Indonesia is one of the active volcanoes in Indonesia. The eruption of Mount Sinabung produces volcanic smoke and dust. The last eruption that occurred on Friday, 6 April, 2018 with column of ash height more than 5 meters and hot clouds glide as far as 3.5 meters to the southeast. Almost four subdistricts in Karo district affected by the eruption which erupted volcanic ash as far as 5 kilometers and still in standby IV category until now. The number of volcanic ash pile from the eruption of Mount Sinabung has become an environmental problem and has harmed the surrounding community. In this research, volcanic ash from the eruption of Mount Sinabung will be used as a mixture of Interlock concrete bricks with mixed variations of 0%, 10%, 20%, 30%, 40% and 50%. Volcanic ash sieved with no. 2000 will be substituted as constituent material of Interlock concrete bricks making, hoping it can increase concrete strength. Tests include a...
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The condition of the reading hut, which only has the pillars of non-structural wood which has a short wooden life, requires the community to periodically replace the rotten wood pillars. Of course this will take a lot of time and costs.... more
The condition of the reading hut, which only has the pillars of non-structural wood which has a short wooden life, requires the community to periodically replace the rotten wood pillars. Of course this will take a lot of time and costs. Children and adults at the service location have good reading interests. They routinely visit the floating reading hut, but lately people's interest has diminished because the condition of the floating library is not feasible. The woods of the floating library building are decayed and not suitable to be occupied. Especially the foundation or pillar of the building can no longer be able to survive firmly. These things are the background of the community service activities team to choose the location to be able to apply civil engineering in making foundation or as a pillar of the floating library building of Belawan Fishermen's Village. The main thing and priority that becomes the problem in theFishermen Village which is the service partner is ...
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The development of science and technology in the field of construction that is rapidly increasing, is always followed by the growing community needs for infrastructure facilities, such as buildings, bridges and other construction. One of... more
The development of science and technology in the field of construction that is rapidly increasing, is always followed by the growing community needs for infrastructure facilities, such as buildings, bridges and other construction. One of the key element in that development is concrete. Due to the rapid development of science and technology in the field of construction, it’s required a building material which has better advantage than the materials of the existing building. To obtain a better building materials, one alternative is the use of waste as aggregate in concrete mixture. In this study the authors using waste steel waste (steel slag) as a substitute for coarse aggregate. Steel slag used is steel waste from PT. Growth Sumatra Industry. The gravel substitution variations is 0%, 15%, and 25% and the testing was done by the slump test, compressive strength and flexural strength of concrete. From the test results obtained optimum compressive strength variation occurs in 25% subst...
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A The current environmental problem is regarding to CO2 gas emissions from cement production and the presence of hazardous material waste (B3) from steel production. One solution for that problem is by applying slag cement as a substitute... more
A The current environmental problem is regarding to CO2 gas emissions from cement production and the presence of hazardous material waste (B3) from steel production. One solution for that problem is by applying slag cement as a substitute for type I portland cement in concrete mix to create a high quality concrete that is environmentally friendly with a high durability and initial strength. This research aimed to compare a high quality concrete made from slag cement and a high quality concrete with conventional mixture. The slag cement used was obtained from PT. Indocement Indonesia. It is coupled with the use of Master Ease 3029 superplasticizer. The results showed that from the samples of concrete of 3, 7, 14, 28, 56 and 90 days of age, the maximum absorption value of normal concrete occurs at the age of 90 days with acid water curing of 1.57%. While the maximum absorption value of slag cement concrete occurs at the same age with acid water curing of 1.50%. The curing of normal co...
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The use of borax solution as a preservative in wood and bamboo materials is well known in the community. A borax solution is an environmentally friendly liquid that can dissolve in water, so it is suitable to be used as a preservative... more
The use of borax solution as a preservative in wood and bamboo materials is well known in the community. A borax solution is an environmentally friendly liquid that can dissolve in water, so it is suitable to be used as a preservative within cold or hot soaking techniques. The ability of borax to resist insects and fungus attacks on bamboo has been proven, but the effect of the solution on the strength of bamboo must also be investigated. This study conducts to investigate the effects of borax and its additives as preservative solutions to the mechanical properties of bamboos. The bamboos preservations were conducted by cold conditions of immersion, while the mechanical properties were performed to understand the effects of preservatives. The result of this study indicated that 30% to 50% borax in the preservative solution is sufficient to provide significant increase in strength for compressive strength, tensile strength, and bending strength of bamboo specimen. From this study, th...
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The more widespread use of concrete and the increasing development shows that there is a greater demand for concrete so a new innovation for concrete is needed in an alternative use of basic materials. Slag cement is the result of fine... more
The more widespread use of concrete and the increasing development shows that there is a greater demand for concrete so a new innovation for concrete is needed in an alternative use of basic materials. Slag cement is the result of fine grinding of steel slag which has the properties of cement which can function as an aggregate adhesive in concrete mixtures and has a fineness level that is either equal or more than type I portland cement. This research aims to compare high quality concrete made from slag cement and conventional concrete mixtures. Concrete beam samples with the size of 20 cm × 30 cm × 240 cm, with 2D10 compressive reinforcement and 3D10 tensile reinforcement. The number of samples are 6 with a variation of 3 high quality reinforced concrete with type I portland cement and 3 using slag cement. Flexture test is by analyzing the behavior of beams due to loading, crack patterns, and visual results of the beam with slag cement. From the results of the research, at the same load of 8 tons obtained a maximum deflection value of 9.52 mm on structural beams with slag cement and 13.30 mm on normal structural beams, thus structural beams with slag cement have better rigidity. The crack patterns that occur is the flextural crack patterns that occur in 1/3 of the middle span with a number of 5 cracks and a maximum crack width of 0.218 mm that occurs in structural beams with slag cement.
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The occurrence of a high temperature change, such as in a fire incident will have an impact on the concrete structure, cracked surface structure, damage/collapse, and discoloration of the concrete. This research is conducted on K300... more
The occurrence of a high temperature change, such as in a fire incident will have an impact on the concrete structure, cracked surface structure, damage/collapse, and discoloration of the concrete. This research is conducted on K300 concrete with a sample of 15 cm x 15 cm x 15 cm cubes. Burning is carried out at temperatures of 250°C, 500°C, 750°C, and 1000°C with a containment time of 2, 4 and 6 hours. The cooling process is carried out by immersion then rested for 24 hours at room temperature. From the results of the research obtained at temperatures of 250°C, 500°C, 750°C, and 1000°C, the decrease in compressive strength are 4.44% -7.41%, 12.59% -22.96%, 56.44% -66.22%, and 76.74% - 100%. At the containment time for 2 hours, 4 hours and 6 hours, the decrease in compressive strength are w = 4.44% - 76.74%, 6.67% -93.70%, and 7.41% - 100%. At temperatures of 250 °C, 500°C, 750°C, and 1000°C, the increase in porosity are 8.09% - 9.57%, 11.79% - 15.50%, 16.98% - 18.46%, and 19.20% - 26.61%. At the containment time for 2 hours, 4 hours, and 6 hours, the increase in porosity are 8.09% - 19.20%, 8.83% - 22.16%, and 9.57% - 26.61%. From this research, it can be seen that the increase in temperature has a greater impact on the decrease in the compressive strength of concrete and the increase in the porosity of concrete compared to the increase in the combustion duration. Through this research, regression equations are generated which can be used to calculate the residual compressive strength at other combustion temperatures.
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In general, rice straw has not been used optimally, rice straw is currently still used as animal feed, paper-making materials and most of it is burned. In this research, rice straw is used as an added ingredient in the concrete mixture.... more
In general, rice straw has not been used optimally, rice straw is currently still used as animal feed, paper-making materials and most of it is burned. In this research, rice straw is used as an added ingredient in the concrete mixture. The addition of rice straw fiber in this research uses 0%, 5%, 10%, 15%, and 20% variations of the volume. The addition of the straw fiber affects the concrete strength. In slump test, there is an increase in its values by 8, 10, 10, 10, and 1. In compressive strength test, there is a decrease by 70.76%, 68.61%, 54.35%, 53.49% of normal concrete. In the tensile strength test, there is a decrease in the concrete tensile strength value by 52.39 kg / cm2, 38.31 kg / cm2, 35.36 kg / cm2, 25.49 kg / cm2, 25.42 kg / cm2. While on the sound attenuation test, there is an increase on sound absorption coefficient, the greater the variation of rice straw, the higher the sound absorption coefficient value. The relation between concrete strength and sound absorption coefficient shows that the greater the addition of rice straw fiber, the less the strength of concrete while the sound absorption coefficient is greater.
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Earthquake events produce a shear damage effect on the interlocking masonry wall brick in the form of diagonal cracks. This shows that there’s an influence of the resistance of the masonry to bear the shear force against the horizontal... more
Earthquake events produce a shear damage effect on the interlocking masonry wall brick in the form of diagonal cracks. This shows that there’s an influence of the resistance of the masonry to bear the shear force against the horizontal force in the direction of the wall plane caused by the earthquake. The purpose of this research is to determine the shear strength and crack patterns of walls against static loads and to utilize volcanic ash from Mount Sinabung as one of the constituent materials of interlocking masonry brick because the eruption activity of Mount Sinabung is also one of the most active in the world. The samples are in the form of a 3 m x 3 m wall surrounded by a 0.13 m x 0.13 m beam-column portal filled with interlocking masonry brick of 0.25 m x 0.125 m x 0.1 m with the optimum substitution of Mount Sinabung volcanic ash by 20% as a substitute for sand. Wall portal test was done by giving a pushover static load on the wall joint which refers to ASTM E 564-2003 to ge...
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In the management of the infrastructure of the building, during the period of buildings common building damage as a result of several reasons, earthquakes are common. The building is planned to work for a certain service life. But during... more
In the management of the infrastructure of the building, during the period of buildings common building damage as a result of several reasons, earthquakes are common. The building is planned to work for a certain service life. But during the certain service life, the building vulnerable to damage due to various things. Any damage to cultivate can be detected as early as possible, because the damage could spread, triggering and exacerbating the latest. The newest concept to earthquake engineering is Performance Based Earthquake Engineering (PBEE). PBEE divided into two, namely Performance Based Seismic Design (PBSD) and Performance Based Seismic Evaluation (PBSE). Evaluation on PBSE one of which is the analysis of nonlinear pushover. Pushover analysis is a static analysis of nonlinear where the influence of the earthquake plan on building structure is considered as burdens static catch at the center of mass of each floor, which it was increased gradually until the loading causing the melting (plastic hinge) first within the building structure, then the load increases further changes the shapes of post-elastic large it reached the condition of elastic. Then followed melting (plastic hinge) in the location of the other structured.
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Self Compacting Concrete (SCC) is a technology which is developing today in which concrete solidifies by itself without using vibrator. Casting conventional concrete which has a lot of reinforcement bars sometimes finds difficulty in... more
Self Compacting Concrete (SCC) is a technology which is developing today in which concrete solidifies by itself without using vibrator. Casting conventional concrete which has a lot of reinforcement bars sometimes finds difficulty in achieving optimal solidity. The method used to solve this problem is by using SCC technology. SCC was made by using filler, volcanic ash, and lime ash as the filling materials so that the concrete became more solid and hollow space could be filled up. The variation of using these two materials was 10%, 15%, 20%, and 25% of the cementitious mass and using 1% of superplasticizer from cementitious material. The supporting testing was done by using the test when the concrete was still fluid and when it was solid. Malleable concrete was tested by using EFNARC 2002 standard in slump flow test, v-funnel test, l-shaped box test, and j-ring test to obtain filling ability and passing ability. In this malleable lime concrete test, there was the decrease, compared with normal SCC concrete without adding volcanic ash and lime ash. Testing was also done in solid concrete in compressive strength, tensile strength, and concrete absorption. The result of the testing showed that the optimum tensile strength in Variation 1, without volcanic ash and lime ash – with 1% of superplasticizer was 39.556 MPa, the optimum tensile strength in Variation 1, without volcanic ash and lime ash- with 1% of super-plasticizer was 3.563 MPa, while the value of optimum absorption which occurred in Variation 5 (25% of volcanic ash + 25% of lime ash + 50% of cement + 1% of superplasticizer) was 1.313%. This was caused by the addition of volcanic ash and lime ash which had high water absorption.