Effect of Lime and Fly Ash on Load Bearing Capacity of Expansive Soil: A Review
Asres Getnet
Department of Civil Engineering, Sharda University , IN
Hika Wachila
Department of Civil Engineering, Sharda University , IN
Keywords: Atterberg limits, bearing capacity, unconfined compressive strength (UCS), CBR
Abstract
Expansive soil is a sticky soil which found in wide part of the world that has a high degree of sensitivity, nature of expansion and shrink behavior during water adding and removing through it. Expansive clay has the behavior of high compressibility, low shear strength, low permeability, high plasticity and potential shrinkage. This condition can cause demolish of building structures, road highway and gravity dam. Problems happen in clay expansive soils are inadequate bearing capacity and excessive settlement. Construction takes place in such type of soil result will be bearing capacity failure, excessive deferential settlement, heave and subsidence problem. The aim of this paper focuses that by adding lime and fly ash to the clay expansive soil can improve the physical properties, effectively
increase the bearing capacity and decrease the swelling potential of the soil base. Application of lime and fly ash to improved Atterberg limits, compaction characteristics, bearing capacity and prevention of swelling problem of expansive clay. Adding various percentage of lime and fly ash with expansive soil and then study how much it modify the characteristics of soil like maximum dry density, moisture content, consistency limits, swelling index, unconfined compression strength, durability and CBR value which compare to untreated soil and other stabilizers. The main reason to select lime and fly ash in this paper, both are good material to increase the bearing capacity of soil, durability, reduce swelling potential and shrinkage problem. Soil is mixed with lime and fly ash and carried out various tests Such as Sieve analysis or hygrometry analysis test, Moisture content test, consistency limit, Specific
gravity test, compaction test, Unconfined Compression test, swelling index test and California bearing ratio test. Classification of soil was determined by conducting index property and grain size analysis tests. Effect of lime and fly ash on plasticity index properties were assessed by conducting Atterberg limits test, strength properties were assessed by conducting compaction test, UCS tests and CBR test and swelling properties were checked by conducting free swelling index test. Expansive clay soil were mixed with different proportion of combination of lime with fly ash by replacement soil and cured for 7, 14 and 28 days.
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