EXPERIMENTAL STUDY OF STABILIZATION OF EXPANSIVE SOIL USING THE MIXTURE OF MARBLE DUST, RICE HUSK ASH AND CEMENT FOR SUB-GRADE ROAD CONSTRUCTION: A CASE STUDY OF WOLDIA TOWN

Understanding the behavior of expansive soil and adopting appropriate control measures should be great for civil engineers. Extensive research has been going on to find solutions associated with problems soils. There have many methods available expansiveness these The removal soils replacement suitable material widely practiced worldwide. Reasonable is within economic distances; however, materials not readily an in urban areas borrowing, which hauled from a long distance. Instead borrowing distance away, after stabilization cost effective industrial agricultural waste materials, it economical use locally plastic soil. Such wastage products are also used minimize environmental hazards such as CO2 atmosphere percentage stabilization, cement. Marble dust (MD), product, Rice husk ash (RHA), products, cement this present study. general objective study was examine effects poor subgrade using mixture MD, RHA enhance sub-standard engineering properties materials. Moisture content, Atterberg limits, grain size analysis, classification, free swell index, basic gravity, compaction (maximum dry density, optimum moisture content) CBR value test calculated analysis. design analysis followed by experimental method were adopted, started sample selection. A disturbed samples collected pit at depth 1.5 m 2m ground level order avoid inclusion organic matter considering index observation considered. chemical MD conducted laboratory main oxides (SiO2+Al2O3+Fe2O3) 70.13% 42.43% MD. satisfy requirement, while did meet requirement ASTM C 618. Gomata Teachers’ Condominium (GTC) result 42.72% (PI), 85% its 2.265%. Millennium Secondary school (MSS) 48.79% PI, 87% 2.121% value. Therefore highly checked before any stabilizations process based their plasticity standard specification , then achieved proposed (0,8MD,6MD+2C,4MD+4C,2MD+6C,8C,6MD+2RHA, 4MD+4RHA, 2MD+6RHA,8RHA,6RHA+2C,4RHA+4C,2RHA+6C,2MD+2RHA+4C,4MD+2RHA+2C, 2MD+4RHA+2C) proportion. Then LL, OMC, decreased ratio increased, PL, MDD increases instead increases, increase, quantity decreases. outcome compared Ethiopian road authority standard, AASHTO. Based all mixing stabilizers (MD-cement, RHA-cement, MD-RHA, MD-RHA-cement) 8% fulfill ERA requirements However, marble alone does Ethiopia swell. standalone improving some construction. they mixed different percentages can effectively stabilizer sub-grade