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2007, Proceedings, ISBN 978-80-227-2639-9
The life of road depends on strength of the subgrade soil and traffic density. The subgrade soil is not uniform throughout the alignment of the road. Generally the poor subgrade soil having soaked California Bearing Ratio (CBR) value less than 2% is replaced by good quality subgrade material. This paper deals with the improvement in various properties of subgrade soil by using soil stabilizer and locally available poor materials. The additive like RBI Grade 81is used to improve the properties of subgrade soil. The cost of construction of road increases, if only RBI Grade 81 is used as a stabilizer. The CBR value of subgrade soil can be improved by using moorum with RBI Grade 81and cost of construction can be reduced to certain extent. From CBR test, it is found that the CBR value of soil is improved by stabilizing soil with 1% and 2% RBI Grade 81. The various mixes of clay and silt soil with RBI Grade 81 for the different proportions were tested for maximum dry density (MDD), optimum moisture content (OMC) and soaked CBR value.
International Journal of Modern Trends in Engineering & Research
A Study on the Effects of Rbi Grade 81 on the Properties of Subgrade SoilInternational Journal for Research in Applied Science and Engineering Technology -IJRASET
Addition of RBI-81 with Geotextiles in Subgrade to Strengthen Soil for Bituminous Pavements2020 •
In the past 20 years, many new road improvement techniques have revolved around the use of geosynthetics. In India, most of the flexible pavements are need to be constructed over weak sub-grade having low modulus values. The California bearing ratio (CBR) of these sub-grade soils has very low, resulting in more thickness of the road crust. Replacing of these existing weak sub-grade soil may not be good option, thus it is required to stabilize these weak sub-grade soil with suitable stabilizer. Geosynthetics have been found to be a cost effective alternative to improve the weak sub-grade soils in adverse locations. In this study, firstly the various properties of soil sample like grain size analysis, liquid limit, plastic limit, plasticity index & identification of soil has been evaluated and then CBR values of these soils have been improved using geotextiles. Non-Woven geotextiles are placed at different layers of various soil samples, and then a series of California Bearing Ratio (CBR) tests were conducted to evaluate the strength of the subgrade soil. It was observed that the CBR value increases, when the non-woven geotextile are placed at different layers of various soil sample. From this study, single layer of non-woven geotextiles is introduced at the depth of 0.85H from the bottom of the mould shows better performance than those samples with the geotextiles layer are placed at other depths. In this study, the flexible pavement have been designed for both fatigue and rutting life of 100MSA at 90% and 80% reliability, when the non-woven geotextile are placed at three different depths of subgrade soil samples. The critical strain value for both fatigue and rutting life are analysed by programme IITPAVE software and are less than the allowable strain values as computed by IRC: 37-2012.
As we know the road development is one of the major parts of growing infrastructure & Nepal, which is expanding at a very fast rate, the construction of roads is of major concern. As per IRC recommendation, California Bearing Ratio (CBR) value of subgrade is used for design of flexible pavements. The CBR test may be done either in Soaked Specimen or in Unsoaked Specimen. But the standard test requires soaked test, hence in this experiment Soaked Specimens are prepared and tested for CBR values. Also as fly Ash is one of the abundant forms of Solid Waste produced at thermal power plants. Its disposal is a big problem. keeping both these concerns in mind it was tried to come out with a project which will integrate Road development and Fly ash disposal. Thus, in this project we intend to calculate and compare CBR values of natural soil with soil mixed of Lime and fly ash in the ratio 1:3 and then calculated their respective pavement thickness.
2016 •
Soil stabilization is a major concern in India where the civil engineering infrastructure is developing at a very fast pace. Large area of country is covered with expansive soil which has poor engineering properties and not suitable for construction. So soil stabilization is necessary to enhance it's engineering performance such as workability, stiffness, strength, permeability, compressibility and sensitivity. This review paper deals with the soil stabilization using a chemical additive RBI Grade-81. It is a very effective stabilizer and can be used in sub grade, sub base and base layer. The industrial waste like Pond ash, Fly Ash, Stone dust, Foundry Sand, Steel Slag etc can also be used with RBI Grade-81 as stabilizer to reduce the cost.
The influence of Renolith, a polymer-based product composed of latex with cellulose and available in liquid form, on cement-stabilized lateritic soils was investigated to find out any improvement in the strength of the soils. The assessment was carried out on materials from four different borrow pits. After classification of the soils, the unsuitable ones were established in the fourth borrow pit and subjected to stabilization. The ensuing results showed an array of remarkable improvements over each percentage at which cement was kept constant (i.e. at 5% and 10% of the dry weight of soil), and Renolith varied (i.e. at 2.5%, 5%, 7.5%, and 10% of the weight of cement respectively). There was a consistent peak of strength observed at the value of Renolith at 5% of the weight of cement used; though the stronger result was arrived at with higher percentage of cement (at 10% of the dry weight of soil). However, the poorest of the stabilized samples displayed interesting results from the tests in that it’s strength indices increased by 7% in Maximum Dry Density; 1,863% in Unsoaked California Bearing Ratio and 200% in Unconfined Compressive Strength after 28 days.
IOSR Journal of Mechanical and Civil Engineering
A Study on Soil Stabilization Using Rbi Grade 812016 •
Weak subgrade is the main problem facing most highway projects. Therefore, this study focuses on trying to improve the properties and increase the strength of weak, clayey, swelling soil for use as a subgrade for pavement structural sections. This trial was developed using a mix of granular and chemical stabilization for the soil. Granular stabilization was applied firstly by mixing natural sand at different percentages of 20%, 35%, and 50% of the total weight of clayey, swelling soil samples to find the minimum percentage that could be added to improve it to sandy, clayey soil, which is acceptable as a subgrade according to the Egyptian highway specification code. Secondly, chemical stabilization was applied to enhanced sandy, clayey soil to increase its strength properties. This was performed by adding chemical additives (lime, cement kiln dust (CKD), fiberglass, Addicrete 11, and gypsum) at different ratios of 2%, 4%, and 6% of the total weight of the samples of enhanced sandy, c...
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