Research Paper
E-ISSN NO : 2455-295X | VOLUME : 3 | ISSUE : 9 | SEP 2017
AN EXPERIMENTAL INVESTIGATION ON HYDRATED HYDRATED LIME AND FLY ASH IN IMPROVING CBR OF SOIL IN ANDHRA PRADESH *D KRANTHI KUMAR 1 | B.SRIKANTH 2 1 PG
STUDENT, DEPARTMENT OF CIVIL ENGINEERING, M.V.R COLLEGE OF ENGINEERING & TECHNOLOGY, INDIA - 520002. ASSISTANT PROFESSOR, DEPARTMENT OF CIVIL ENGINEERING, M.V.R COLLEGE OF ENGINEERING & TECHNOLOGY, INDIA - 520002. 2
ABSTRACT The sub-grade, sub base and base course materials affects the quality and life of pavement greatly. The type and quality of sub grade soil is most important of these. But most of flexible pavements in India are used to be constructed over weak sub grade. The California Bearing Ratio (CBR) of these sub grade have very low, it need to more thickness of pavement. This paper represents a study of Hydrated Lime and Fly Ash as the admixture in improving the maximum dry density (MDD), optimum moisture content (OMC), California Bearing Ratio (CBR), Liquid Limit, Plastic Limit. The Hydrated Lime and Fly Ash percentages varied from 3% to 10% .The optimum moisture content(OMC), California Bearing Ratio(CBR) increased with an increase in percentage of Hydrated Lime but liquid limit, Plastic limit, maximum dry density(MDD) of soil decreased with increase in Hydrated Lime percentage. The liquid limit, plastic limit and maximum dry density (MMD) of the soil decreased and the optimum moisture content (OMC), California Bearing Ratio (CBR) increased with an increase in percentage on Fly Ash. The objective of this work is to estimate the effect of Hydrated Lime and Fly Ash on some geotechnical properties of soil, in order to determine the suitability of Hydrated Lime and Fly Ash for use as a modifier in the treatment of soil for roadwork. The aim of this investigation is to quantify the optimum quantity of Hydrated Lime and Fly Ash on the performance in term of CBR especially when it is planned to be used as sub grade in highways. Keywords: CBR value, Hydrated Lime, Fly Ash, MDD.
Introduction The topic “an experimental investigation on hydrated lime and fly ash in improving CBR of soil in Andhra Pradesh” aims at conducting laboratory investigations on some selected soils of Andhra Pradesh with the addition of Hydrated Lime and fly ash in varying proportions to determine improvement in California Bearing Ratio of the soils. The soils used are from three different areas of Andhra Pradesh. Improved sub grade soil with higher CBR value reduces the pavement crust requirements. California Bearing Ratio (CBR) test was developed by the California Division of Highways. The basic procedure of this test was developed by the corps of Engineers of the US Army. Certain modifications were made in the test procedure, and now the modified method is adopted by the corps of the Engineers and regarded as the standard method of determining the CBR value. The Bureau of Indian Standard (IS: 2720-Part 16, 1987) has also adopted the modified procedure. The study has been conducted on three different types of soils that are generally available in Andhra Pradesh. These are ML type (silts of low plasticity collected from Krishna), CL type (clays of low plasticity collected from West Godavari) and SM type (silty sands collected from Guntur). The laboratory investigations are carried out with a view to improve CBR value of the soils. Significance of Sub grade Soil is a deposit of earth material, derived naturally from the breakdown of rocks or decay of undergrowth that
can be excavated readily with power equipment in the field or disintegrated by gentle reflex means in the laboratory. Top 500 mm of naturally occurring local soil that is well compacted is generally termed as sub-grade. It is just beneath the pavement crust, providing a suitable foundation for the pavement. The loads on the pavements are ultimately transmitted to the ground below through the sub-grade. The sub grade, whether in cutting or in embankment, should be well compacted to utilize its full strength and to economize on the overall pavement thickness. The current MORTH specifications require that the sub-grade should be compacted to 97% of Maximum Dry Density (MDD) achieved by the Modified Proctor Test (IS 2720-Part 8). For the purpose of flexible pavement design, sub-grade soil is characterized on the basis of CBR. Better sub-grade means higher CBR which results in lower thickness requirement for a particular traffic.
Study topic and its importance The topic “an experimental investigation on hydrated lime and fly ash in improving CBR of soil in Andhra Pradesh” aims at conducting laboratory investigations on some selected soils of Andhra Pradesh with the addition of Hydrated Lime and fly ash in varying proportions to determine improvement in California Bearing Ratio of the soils. The soils used are from three different areas of Andhra Pradesh.
Objectives of the study
INTERNATIONAL EDUCATIONAL SCIENTIFIC RESEARCH JOURNAL
25