01153535

Component

An expansive tropical black clay (also known as black cotton soil because cotton plant thrives well on it) was treated with up to 8% lime and admixed with up to 10% blast furnace slag, BFS (a by-product of the smelting of ore metals) by dry weight of soil, respectively. Specimens of treated soil compacted at the energy of the standard Proctor (relative compaction = 100%) were subjected to index, compaction, unconfined compressive strength (UCS), California bearing ratio (CBR) and durability tests. The results of laboratory tests show that properties of the soil improved when treated with lime – slag blends. Free swell and linear shrinkage decreased from 70 and 13% for the natural soil to 19 and 5%, respectively, for soil treated with 6% lime/7.5% slag content. The UCS and CBR values increased from 490 kN/m2 and 8 % for the natural soil to 825 kN/m2 and 58%, respectively, at 8% lime /5% slag treatment. Optimum properties of the tropical black clay – lime - slag mixture were obtained at 8% lime/ 7.5% slag content based on strength and durability assessments The mixture can be used as sub-base and base courses of lightly trafficked roads.

01147878

10-0585

English

18p

2010

Transportation Research Board 89th Annual Meeting

DVD

Figures (12) ; References (40) ; Tables (3)

Admixtures; Clay soils; Expansive clays; Portland cement; Slag; Soil mechanics; Soil stabilization

Nigeria

Geotechnology; Highways; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2010 Paper #10-0585

BTRIS, TRIS, TRB

Jan 25 2010 10:18AM