13-06-2012, 02:30 PM
BEHAVIOUR OF DIFFERENT SOILS
BEHAVIOUR OF DIFFERENT SOILS.pptx (Size: 464.06 KB / Downloads: 55)
INTRODUCTION
Soil is defined as an unconsolidated material, composed of solid particles, produced by the disintegration of rocks.
Expansive soil is also called Black cotton soil in India, this soil exhibits high swelling and shrinkage.
The present study made an attempt to stabilize such soils with industrial wastes like Rice Husk Ash, Fly ash.
Geotechnical properties such as Index properties, compaction and strength characteristics are determined.
Treatment is done with various proportions of Rice Husk Ash, Rice Husk-Fly Ash and Rice Husk Ash-Fly Ash-Lime.
Soil is replaced with Rice Husk Ash in 2%, 4% and 6% to dry weight of soil.
The maximum percentage increase in strength increase is observed when 4% RHA replaced the soil.
Hence 4% RHA replacement is optimum for the present soil in view of index properties and strength characteristics.
RICE HUSK ASH
Rice husk is an industrial residue abundantly available in rice producing industries.
RHA is obtained from the burning of rice husk which is the byproduct of rice milling.
Well burnt RHA passing through 425micron sieve was used in this investigation for convenient mixing of clay and compaction.
The RHA used showed high silica content of 90% which is an indication of good pozzolonic materials.
The chemical properties of RHA are presented in the table.
EFFECT OF RHA ON COMPACTION CHARACTERISTICS
Compaction tests are conducted on soil replaced without and with 4%, 6% RHA.
The Maximum Dry Density is increased up to 4% RHA and beyond which it decreases while the OMC decreased up to 4% RHA and beyond which it increases.
The optimum RHA from view point of compaction characteristics is 4%.
Accordingly compaction curves are plotted for 4% and 6% RHA from which OMC and MDD are known.