DEVELOPMENT OF SOIL COMPOSITES AS ALTERNATIVE TO ASPHALT USING ORGANIC AND INORGANIC BINDERS

Abstract

This work present the result of experimental investigation carried out on partial replacement of asphalt with the mixture of some soil samples and additive like cement ash, lime, gum that were extracted from a plant (cissus populnea). Soil samples were also collected near quarry sites where stone were crushed/break. All the samples were preserved appropriately and physiochemical parameters, water holding capacity, nutrients (nitrogen, phosphorus) organic matter, moisture content, alterberg limit (plastic and liquid limit) and particle size distribution were determined. The result of the pH for the simple ranged from 3.56 to 4.90 which shows that they are also acidic in nature, Water holding capacity ranged from 36.36 % to 38.38 %, organic matter ranged from 0.24 % to 2.48 %, mineral contents of Na ranged 0.21 ppm to 0.35 ppm, K ranged 0.03 ppm to 2.27 ppm, Mg ranged 0.39 ppm to 0.79 ppm, Ca ranged 0.99 ppm to 2.39 ppm. The dry density of soil sample without binders ranged for 1.92 mg/m3 to 2.00 mg/m3 but when 5% of binders were added to it. It shows an increase in the dry density which now ranged from 2.05mg/m3 to 6.09mg/m3. When 10 % of binders were added again the dry density reduced. The moisture content of soil samples ranged from 6.26 % to 10.44 %, but there was an increase in the moisture content when binder were added to the soil sample which ranged from 17.41 % to 18.52 %. the compaction of the soil sample shows that there was an increase in dry density which ranged from 2206 (kg/m3) to 2376 (kg/m3) while the addition of mucilage cissus populnea to the compacted soil samples reduces the dry density which ranged from 2093 (kg/m3) to 1701 (kg/m3) i.e humus plus lime. The liquid limit of compacted soil samples showed that as the number of blow reduces (from 32 to14) the moisture content increases from 21.34 to 26.08. The sieve analysis of humus plus lime shows that the log of sieve reduced from 0.6766 to 0.0001 as the % passing reduced as well from 88 to 0. The sieve analysis of laterite plus lime showed that the log of sieve reduced from 0.6766 to 0.0001 while the % passing reduced from 85.35 to 0.21. the dry density of the compacted soil sample (laterite plus lime) reduced from 2069 (kg/m3) to 1546 (kg/m3 ). The liquid limit of red sand plus lime shows that the number of blows reduced from 30 to 10 as the moisture content increased from 12.92 to 19.23. The compaction of white sand plus lime shows that the dry density reduced from 2376 (kg/m3) to 1713 (kg/m3).The sieve analysis of white sand plus lime showed that the log of sieves reduced from 0.6766 to 0.0001 whereas the percentage passing reduced from 88.25 to 0.01. The sieves analysis of laterite plus ash shows that percentage passing reduced from 89.73 to 45.33 while the log of sieve reduced from 0.6766 to 0.0001.The compaction of humus plus ash showed that the dry density reduced from 2376 (kg/m3 ) to 1713 (kg/m3).