This paper describes a component-based model developed to predict the behaviour of flexible end-p... more This paper describes a component-based model developed to predict the behaviour of flexible end-plate composite connections at elevated temperature. In the model the connection elements are treated as springs with predefined characteristics such as stiffness and strength. By assembling the characteristics of individual elements, the connection response can be predicted with increasing temperatures.
The main objective of this research is to evaluate the use of cement by-pass dust(CBPD), copper s... more The main objective of this research is to evaluate the use of cement by-pass dust(CBPD), copper slag(CS), incinerator ash(IA) and quarry fines(QF) as partial replacements for Portland cement in highway and building construction. The physical and chemical properties of these materials were determined. Four types of mixes were prepared using 0, 5, 10 and 15% of these materials as a replacement for cement at a water-to-cement ratio of 0. 4.
This paper presents the results of an investigation to study the possibility of developing concre... more This paper presents the results of an investigation to study the possibility of developing concrete blocks using waste materials. The blocks were produced from three waste materials: vermiculite and polystyrene beads, which were used as lightweight aggregates with different proportions in the mix, and cement kiln dust (CKD), which was used as a partial replacement for cement.
This paper presents the results of a study that investigated the properties of concrete made with... more This paper presents the results of a study that investigated the properties of concrete made with dune sand. Different control concrete mixtures using ordinary Portland cement (OPC) with a minimum design compressive strength of 40N/mm2 were prepared. The amount of fine aggregates constituted about 36% by weight of all the aggregates. The workability ranged from low of 16mm to a high of 122mm.
This research was undertaken to study the effect of copper slag (CS) and cement by-pass dust (CBP... more This research was undertaken to study the effect of copper slag (CS) and cement by-pass dust (CBPD) addition on concrete properties. In addition to the control mixture, two different trial mixtures were prepared using different proportions of CS and CBPD. CBPD was primarily used as an activator. One mixture consisted of 5% copper slag substitution for portland cement. The other mixture consisted of 13.5% CS, 1.5% CBPD and 85% portland cement. Three water-to-binder (w/b) ratios were studied: 0.5, 0.6 and 0.7.
Heavy use of electric power has become essential for cooling purposes and comfort inside building... more Heavy use of electric power has become essential for cooling purposes and comfort inside buildings in the Gulf area where outdoor temperatures in summer can reach up to 60° C. The use of insulating materials is not popular, despite their long-term financial benefit, due to the fact that installation of such materials is expensive and requires skilled labour.
Fresh water is a precious and scarce commodity in all arid regions such as Oman and other parts o... more Fresh water is a precious and scarce commodity in all arid regions such as Oman and other parts of the Arabian Peninsula. However, non-fresh water supplies including brackish groundwater and oily water that accompanies oil production activities, and treated wastewater exist in abundant quantities in these regions. A flowable fill, also known as a controlled low strength material, is a self-compacted, cementitious material used primarily as a backfill.
Various wastes and by-product materials are generated in the Sultanate of Oman including reclaime... more Various wastes and by-product materials are generated in the Sultanate of Oman including reclaimed asphalt pavement (RAP) aggregate, demolition concrete, cement by-pass dust (CBPD), copper slag, petroleum-contaminated soils (PCS), discarded tires, incinerator ash, and others. Recycling of such materials in construction is not practiced. Research data are also minimal into the potential use of selected materials in construction applications.
A controlled low strength material (CLSM) is a self-compacted, cementitious material used primari... more A controlled low strength material (CLSM) is a self-compacted, cementitious material used primarily as a backfill. It is also known as a flowable fill which is usually a mixture of fine aggregates, small amount of cement, fly ash, and water. To be classified as a CLSM, the mixture must have a compressive strength between 345 and 8400kPa. This paper evaluates the potential use of cement by-pass dust, incinerator ash and copper slag as a CLSM.
In the last few years, extensive research has been done on the strengthening of concrete structur... more In the last few years, extensive research has been done on the strengthening of concrete structures using fiber reinforced polymers (FRP) as externally bonded sheets or plates. A limited number of studies have also been performed on the strengthening of steel and steel–concrete composite structures. Constructing and testing steel–concrete composite beams is not only time consuming but also expensive.
Corrosion of reinforcement is a serious problem and is the main cause of concrete structures dete... more Corrosion of reinforcement is a serious problem and is the main cause of concrete structures deterioration costing millions of dollars even though the majority of such structures are at the early age of their expected service life. This paper presents the experimental results of damaged/repaired reinforced concrete beams. The experimental program consisted of reinforced concrete rectangular beam specimens exposed to accelerated corrosion.
This paper presents an overview of the modelling and simulation methods, which have recently been... more This paper presents an overview of the modelling and simulation methods, which have recently been developed in the literature to simulate the behaviour of the beam-to-column joints at elevated temperature. These include curve-fit models, component-based models, finite element models, and artificial neural network models. The study concluded that the various numerical modelling methods can be used reliably to predict the behaviour of joints at elevated temperature to an acceptable degree of accuracy.
ABSTRACT: Structural elements such as beams, slabs and columns may require strengthening or repai... more ABSTRACT: Structural elements such as beams, slabs and columns may require strengthening or repair during their service life period. With aging of the infrastructure and many concrete structures reaching the end of their design life, maintenance and repair is becoming an increasingly important part of the design and construction industry. Different types of repair materials are available in the market and it is usually difficult to choose the best repair material especially when considering the cost of such materials.
Abstract This paper studies the effect of using FCC spent catalyst, produced from local refinerie... more Abstract This paper studies the effect of using FCC spent catalyst, produced from local refineries on the compressive strength of mortars. The main constituents of mortar; sand and cement were partially replaced by different percentages of spent catalyst. Five levels of sand replacement were used ranging from 5% to 25% by weight of sand. The same was done for cement but with different proportions from 2% to 10% by weight of cement.
Waste spent catalyst is generated in Oman as a result of the cracking process of petroleum oil in... more Waste spent catalyst is generated in Oman as a result of the cracking process of petroleum oil in the Mina Al-Fahl and Sohar Refineries. The disposal of spent catalyst is of a major concern to oil refineries. Stabilized spent catalyst was evaluated for use in road construction as a whole replacement for crushed aggregates in the sub-base and base layers and as a partial replacement for Portland cement in masonry blocks manufacturing.
This paper presents a finite element analysis procedure developed to study the behavior of a flex... more This paper presents a finite element analysis procedure developed to study the behavior of a flexible end-plate connection between steel beams and a column at elevated temperatures and generates temperature-rotation diagrams that describe the behavior of the connection. The analysis used a highly detailed three dimensional finite element model that is created using the commercial ABAQUS software. The steel connection properties are selected in a way that reflects commonly used connections in steel framed buildings.
Fiber reinforced polymer matrix composites are being increasingly considered for use in civil inf... more Fiber reinforced polymer matrix composites are being increasingly considered for use in civil infrastructure. These materials have found the maximum current use as materials for rapid and cost-effective rehabilitation (retrofit, repair and strengthening) of deteriorating and under-strength structural concrete components. This paper presents the experimental results of damaged/repaired reinforced concrete (RC) beams. The experimental program consisted of RC rectangular beam specimens exposed to accelerated corrosion.
This paper describes a component-based model developed to predict the behaviour of flexible end-p... more This paper describes a component-based model developed to predict the behaviour of flexible end-plate composite connections at elevated temperature. In the model the connection elements are treated as springs with predefined characteristics such as stiffness and strength. By assembling the characteristics of individual elements, the connection response can be predicted with increasing temperatures.
The main objective of this research is to evaluate the use of cement by-pass dust(CBPD), copper s... more The main objective of this research is to evaluate the use of cement by-pass dust(CBPD), copper slag(CS), incinerator ash(IA) and quarry fines(QF) as partial replacements for Portland cement in highway and building construction. The physical and chemical properties of these materials were determined. Four types of mixes were prepared using 0, 5, 10 and 15% of these materials as a replacement for cement at a water-to-cement ratio of 0. 4.
This paper presents the results of an investigation to study the possibility of developing concre... more This paper presents the results of an investigation to study the possibility of developing concrete blocks using waste materials. The blocks were produced from three waste materials: vermiculite and polystyrene beads, which were used as lightweight aggregates with different proportions in the mix, and cement kiln dust (CKD), which was used as a partial replacement for cement.
This paper presents the results of a study that investigated the properties of concrete made with... more This paper presents the results of a study that investigated the properties of concrete made with dune sand. Different control concrete mixtures using ordinary Portland cement (OPC) with a minimum design compressive strength of 40N/mm2 were prepared. The amount of fine aggregates constituted about 36% by weight of all the aggregates. The workability ranged from low of 16mm to a high of 122mm.
This research was undertaken to study the effect of copper slag (CS) and cement by-pass dust (CBP... more This research was undertaken to study the effect of copper slag (CS) and cement by-pass dust (CBPD) addition on concrete properties. In addition to the control mixture, two different trial mixtures were prepared using different proportions of CS and CBPD. CBPD was primarily used as an activator. One mixture consisted of 5% copper slag substitution for portland cement. The other mixture consisted of 13.5% CS, 1.5% CBPD and 85% portland cement. Three water-to-binder (w/b) ratios were studied: 0.5, 0.6 and 0.7.
Heavy use of electric power has become essential for cooling purposes and comfort inside building... more Heavy use of electric power has become essential for cooling purposes and comfort inside buildings in the Gulf area where outdoor temperatures in summer can reach up to 60° C. The use of insulating materials is not popular, despite their long-term financial benefit, due to the fact that installation of such materials is expensive and requires skilled labour.
Fresh water is a precious and scarce commodity in all arid regions such as Oman and other parts o... more Fresh water is a precious and scarce commodity in all arid regions such as Oman and other parts of the Arabian Peninsula. However, non-fresh water supplies including brackish groundwater and oily water that accompanies oil production activities, and treated wastewater exist in abundant quantities in these regions. A flowable fill, also known as a controlled low strength material, is a self-compacted, cementitious material used primarily as a backfill.
Various wastes and by-product materials are generated in the Sultanate of Oman including reclaime... more Various wastes and by-product materials are generated in the Sultanate of Oman including reclaimed asphalt pavement (RAP) aggregate, demolition concrete, cement by-pass dust (CBPD), copper slag, petroleum-contaminated soils (PCS), discarded tires, incinerator ash, and others. Recycling of such materials in construction is not practiced. Research data are also minimal into the potential use of selected materials in construction applications.
A controlled low strength material (CLSM) is a self-compacted, cementitious material used primari... more A controlled low strength material (CLSM) is a self-compacted, cementitious material used primarily as a backfill. It is also known as a flowable fill which is usually a mixture of fine aggregates, small amount of cement, fly ash, and water. To be classified as a CLSM, the mixture must have a compressive strength between 345 and 8400kPa. This paper evaluates the potential use of cement by-pass dust, incinerator ash and copper slag as a CLSM.
In the last few years, extensive research has been done on the strengthening of concrete structur... more In the last few years, extensive research has been done on the strengthening of concrete structures using fiber reinforced polymers (FRP) as externally bonded sheets or plates. A limited number of studies have also been performed on the strengthening of steel and steel–concrete composite structures. Constructing and testing steel–concrete composite beams is not only time consuming but also expensive.
Corrosion of reinforcement is a serious problem and is the main cause of concrete structures dete... more Corrosion of reinforcement is a serious problem and is the main cause of concrete structures deterioration costing millions of dollars even though the majority of such structures are at the early age of their expected service life. This paper presents the experimental results of damaged/repaired reinforced concrete beams. The experimental program consisted of reinforced concrete rectangular beam specimens exposed to accelerated corrosion.
This paper presents an overview of the modelling and simulation methods, which have recently been... more This paper presents an overview of the modelling and simulation methods, which have recently been developed in the literature to simulate the behaviour of the beam-to-column joints at elevated temperature. These include curve-fit models, component-based models, finite element models, and artificial neural network models. The study concluded that the various numerical modelling methods can be used reliably to predict the behaviour of joints at elevated temperature to an acceptable degree of accuracy.
ABSTRACT: Structural elements such as beams, slabs and columns may require strengthening or repai... more ABSTRACT: Structural elements such as beams, slabs and columns may require strengthening or repair during their service life period. With aging of the infrastructure and many concrete structures reaching the end of their design life, maintenance and repair is becoming an increasingly important part of the design and construction industry. Different types of repair materials are available in the market and it is usually difficult to choose the best repair material especially when considering the cost of such materials.
Abstract This paper studies the effect of using FCC spent catalyst, produced from local refinerie... more Abstract This paper studies the effect of using FCC spent catalyst, produced from local refineries on the compressive strength of mortars. The main constituents of mortar; sand and cement were partially replaced by different percentages of spent catalyst. Five levels of sand replacement were used ranging from 5% to 25% by weight of sand. The same was done for cement but with different proportions from 2% to 10% by weight of cement.
Waste spent catalyst is generated in Oman as a result of the cracking process of petroleum oil in... more Waste spent catalyst is generated in Oman as a result of the cracking process of petroleum oil in the Mina Al-Fahl and Sohar Refineries. The disposal of spent catalyst is of a major concern to oil refineries. Stabilized spent catalyst was evaluated for use in road construction as a whole replacement for crushed aggregates in the sub-base and base layers and as a partial replacement for Portland cement in masonry blocks manufacturing.
This paper presents a finite element analysis procedure developed to study the behavior of a flex... more This paper presents a finite element analysis procedure developed to study the behavior of a flexible end-plate connection between steel beams and a column at elevated temperatures and generates temperature-rotation diagrams that describe the behavior of the connection. The analysis used a highly detailed three dimensional finite element model that is created using the commercial ABAQUS software. The steel connection properties are selected in a way that reflects commonly used connections in steel framed buildings.
Fiber reinforced polymer matrix composites are being increasingly considered for use in civil inf... more Fiber reinforced polymer matrix composites are being increasingly considered for use in civil infrastructure. These materials have found the maximum current use as materials for rapid and cost-effective rehabilitation (retrofit, repair and strengthening) of deteriorating and under-strength structural concrete components. This paper presents the experimental results of damaged/repaired reinforced concrete (RC) beams. The experimental program consisted of RC rectangular beam specimens exposed to accelerated corrosion.
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Papers by Khalifa Al-Jabri