Improvement in properties of subgrade soil by using pond ash and chemical additive (original) (raw)
Related papers
2013
This paper deals with use of pond ash and RBI Grade 81 for improvement in CBR values of clayey soil and grade-III materials used for base course of flexible pavement. The pond ash is a thermal power plant waste and RBI Grade 81 is chemical soil stabilizer. The geotechnical properties like Maximum Dry Density (MDD), Optimum Moisture Content (OMC), Unconfined Compressive Strength (UCS), CBR value and Differential Free Swell (DFS) index of soil are tested in the laboratory for different mixes of soil, pond ash and RBI Grade 81 for different proportions. The mixes of grade-III material, pond ash and RBI Grade 81 tested for CBR test. From the study it is found that the geotechnical properties of clayey soil are improved significantly, if pond ash added with RBI Grade 81. The optimum mix recommended for subgrade is soil: pond ash: RBI Grade 81 in proportions of 76:20:4. The CBR value of grade-III base course treated with 20% pond ash and 4% RBI Grade 81 is increased by 125.93% as compared...
Effect of Fly ash and RBI grade 81 on Geotechnical properties of Expansive soil
This study deals with the improvement in various properties of expansive soil using soil stabilizer Road Building International(R.B.I.) grade 81 and locally available industrial waste material like fly ash. The additive like RBI Grade 81 and Fly ash is used to improve the properties of subgrade soil. The cost of construction of any civil engineering structure may increase, if only RBI Grade 81 is used as a stabilizer. The CBR value of subgrade soil can be improved by using fly ash with RBI Grade 81and cost of construction can be reduced to certain extent. From CBR test, it is found that the soaked CBR value of soil is improved by 635% i.e. 2% to 14.7% by stabilizing soil with 20% fly ash and 6% RBI Grade 81. The various mixes of clayey soil: fly ash: RBI Grade 81 for the different proportions were tested for maximum dry density (MDD), optimum moisture content (OMC) and unconfined compressive strength (U.C.S) values. In the present study, an attempt is made to modify engineering prop...
IMPROVEMENT IN PROPERTIES OF SUBGRADE SOIL BY USING RICH HUSK ASH AND MOORUM
The technology of road construction is subjected to changes to cope up with changing vehicular pattern, construction materials and sub-grade conditions. Rice Husk is a waste material produced in rice industry. Rice Husk can be used in various geotechnical constructions like embankments, soil stabilization, and sub grades etc. Soil stabilization has become a major issue in construction engineering and the researches regarding the effectiveness of using industrial wastes are rapidly increasing. The present experimental work briefly describes the suitability of the locally available Rice Husk Ash (RHA) to be used in the local construction industry in a way to minimize the amount of waste to be disposed to the environment causing environmental pollution. The common soil stabilization techniques are becoming costly day by day due to the rise of cost of the stabilizing agents like, cement, lime, etc. The cost of stabilization may be minimized by replacing a good proportion of stabilizing agent using RHA.
Experimental Study of Stabilization on Natural Soil Subgrade Using Rice Husk Ash
The objective of this work is to utilize the effectiveness of Rice Husk Ash (RHA) material to enhance the properties of natural soil used for subgrade material in pavement. The quality of a flexible pavement depends on the strength of its sub-grade soil. In view of the above the present investigation has been carried out with rice husk ash mixed individually and also in combination with locally available natural soil in different proportions stepped concentration of 5%, 10%, 15%, 20%, 25% and 30% by dry weight of the soil individually are used to stabilized of Natural Soil (CL) and to evaluate its properties like Grain Size Distribution, LL, PL, PI, OMC, MDD, CBR and Swelling Pressure. The test results indicate that the addition of RHA enhances the percentage of grain size distribution, but with addition of RHA till 10% the LL, PL, PI and swelling pressure decreases, while these parameters further increases in this limit beyond i.e. 10% to 30% of RHA while enhancement is observed above 20% to 30%, Specific Gravity and Maximum Dry Density (MDD) decrease with addition of RHA, for all percentage values, whereas OMC increases in each material. The CBR value increases with the addition of RHA till 10%, while it decreases beyond the limit 10% to 30% with addition of RHA.
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.
IRJET, 2022
Nowadays many experimental studies have been carried on black cotton soil to improve its characteristics. This soils is highly clayey in nature as it has low bearing capacity and high swelling shrinkage characteristics. In most of areas of India there is wide spread of black cotton soil which causes the problem to the civil related structures. This soil mainly shrinks in the absence of moisture and swells in the presence of moisture which may leads to the failure of engineering structures resting on it. On reviewing various past research works, it has been found that the utilization of admixtures such as fly ash, Rice husk ash, GGBS, WMP, WCP etc. may be used to increase the geotechnical properties of black cotton soil. Now a day's rapid industrialization causes problems such as disposal of industrial waste materials, environmental pollution etc. In this review, utilization of industrial material is highlighted. On proper reviewing it has been found that there is a wide scope for utilization of industrial waste and other waste material for the stabilization of expansive soils.
Experimental Study on Stabilization of Black Cotton Soil by Brewer Spent Grain Ash for Sub-grade construction, 2021
Expansive soils form a major soil group in Addis Ababa and occur in mostly Bole, Nifas silk lafto, Akaki Kality and in some extent available other parts of the sub city and in most cases the major clay mineral component is montmorillonite. For the past twenty years, those lands have been used for agriculture and Addis Ababa is widened by road and buildings, the problem of the land become more prominent in those sub cities because of that, various studies and road improvements were needed. The performance of roads depends upon the quality of subgrades. A stable subgrade helps to produce a long-lasting pavement due to support provided to the pavement system, therefore the quality of the subgrade will greatly influence the pavement design and the service life of the pavement. This research work is aimed to investigate the performance of brewer spent grain ash for stabilization of expansive clay soil. The laboratory work involved index properties to classify the soil sample. The preliminary investigation of the soil shows that it belongs to A-7-5(20) class of soil in the AASHTO soil classification system. Soils under this class are generally of poor engineering use. Atterberg limits, free swell, specific gravity, modified compaction, unconfined compressive strength and 3Point-CBR tests were used to evaluate properties of stabilized soil. The soil was stabilized with brewer spent grain ash in stepped concentration of 10%, 20% and 30% by dry weight of the soil. Analysis of the results shows makes a light improvement in the engineering properties of brewer spent grain ash stabilized soil. Atterberg limit tests show that the plasticity index slightly reduced from 40% to 30% with an increase in brewer spent grain ash content up to 30%. Linear shrinkage decreased from 27.14% to 15% with increasing the brewer spent grain ash content. The free swell index decreased from 180% to 105% with increasing brewer spent grain ash content. The specific gravity a little bit decreased from 2.66 to 2.22 with increasing brewer spent grain ash, The maximum dry density (MDD) for natural soil is found to be 1.46kg/m^3 and it decreases at 1.35kg/m^3 30% brewer spent grain ash content and The optimum moisture content (OMC) for natural soil is 27.4% and it increased to 31.8% at 30% brewer spent grain ash content. CBR values increase with increasing brewer spent grain ash content. Maximum CBR values are observed to be 5.8% at 30% of brewer spent grain ash content
AIP Conference Proceedings, 2018
In our country, the volume of waste generated from various ways has increased over years. Due to the large production of wastes, the world is facing serious problem to manage the disposal usage issue. One of the most attractive options of managing this problem is by using agricultural waste. These wastes can improve the strength of soil and helps the environment to be eco-friendly. This study is aimed to investigate the effect of Coconut Shell (CS) and Rice Husk Ash (RHA) on engineering properties as the expansive soil for roads' subgrade layer. The untreated soil of subgrade layer like clay and laterite soil was found to be in a low strength. The materials selected to be used in the road construction of subgrade must have the adequate strength and at the same time it must be economical and follow compaction's requirements. Therefore, this study gives an attempt to investigate the performance of soil mixed with CS and RHA. The proportion of constant 20% of RHA content mix with 4%, 6%, and 8% of CS correspondingly is examined with respect to compaction test and California Bearing Ratio (CBR) tests. The results obtained indicate an increase in optimum moisture content (OMC) and slight drop in the maximum dry density (MDD). The CBR value is found to increase appreciably with addition of CS and 20 % of RHA. Hence, the use of 20% of RHA and varying percentage of CS can be an advantage to improve soil engineering properties.
EVALUATION OF RICE HUSK ASH STABILIZED LATERITIC SOIL AS SUB-BASE IN ROAD CONSTRUCTION
Laboratory experiments were conducted and the results were analyzed for rice husk ash (RHA) stabilization of laterite soils for utilization as sub base materials in road construction. The index properties classified the soils as (A-7) under the AASHTO soil classification scheme. The soils were stabilized with 2.5% increment between 5 - 12.5% of rice husk ash (RHA) by dry weight of soil. Performance of the soil-RHA was investigated with respect to compaction characteristics, California bearing ratio (CBR) and unconfined compressive strength (UCS) tests. Addition of RHA decreased the maximum dry density while it increased the optimum moisture content at 5% RHA; the values of maximum dry density (MDD) and optimum moisture content (OMC) were 1962kg/m³ and 24% respectively. California Bearing Ratio results showed that the peak CBR (soaked) value was 135.5% (for 7.5% RHA stabilization) which indicates 92.44% increase over the CBR value obtained for the laterite soils in their natural form. The lowest CBR (soaked) value occurred at 12.5% RHA stabilization. The unconfined compressive strength test results showed that the strength for natural soil was 107.32N/mm² and the highest UCS value for the stabilized soil was 68.82% (the value obtained for 5% stabilization using RHA). This gives 40.5% decrease in the UCS of the natural soil. This research shows little potentials of using RHA only for soil improvement, it is recommended that 5% of RHA be added to soil samples for field stabilization for the purpose of improving the soil engineering properties of the laterite soil for pavement sub-base construction. To achieve high pozzolanic behavior, it is recommended that RHA intended for use in stabilization are calcined burnt between 600°C and 700°C temperature (1).
In this paper an attempt has been made to improve the properties of clayey soil (Near Burla of Sambalpur, Orissa, India) to be used as sub grade by using locally available rice husk ashes as admixtures with lime. It is observed that addition of 3% Lime along with 20% rice husk ash by weight of virgin soil showed a remarkable improvement in the California Bearing Ratio (CBR) values. The soaked (after 4 days soaking curing) CBR value of virgin clayey soil found to be 2.7%. On the other hand, soil mixed with 20% rice husk ash & 3% lime, the soaked CBR increased to 14%. Further it was observed that after 17 days moist curing in air with additional 4 days soaking (21 days curing period) the CBR value increased to 22.3%, which was 8.26 times of CBR value of virgin soil. In this study it was found that Lime in presence of rice husk ash plays a vital role in improving the characteristics of weak soil (clayey) resulting promising strengths. Thus, the use of industrial wastes in rural road infrastructure would definitely result in saving overall cost including minimization of occurrence of environmental pollution hazard.