Potential of Lime on Modified Lateritic Soil Using Locust Bean Waste Ash as Admixture

Abstract

An A-7-6 (11) lateritic soil using AASHTO soil classification system, collected from Shika area of Zaria, Nigeria, was treated with up to 4 % lime and up to 8 % locust bean waste ash (LBWA) by dry weight of the soil. The sieve analysis of the modified soil was carried out immediately after mixing (i.e., 0 hour elapse time). The results of sieve analysis indicate an increase in the particle sizes (i.e., reduction in the fines fraction) with increase in lime/LBWA content. Improvement in the Atterberg limits was also observed. The maximum dry density (MDD) for British Standard Light (BSL) compaction increased to a peak value at 4% LBWA for all lime contents. For the West African Standard (WAS) compaction, the MDD follows the trend of continuous decrease, while no consistent trend was observed for the British Standard Heavy (BSH) compaction. The corresponding optimum moisture content (OMC) values for all the three compactive efforts generally increased steadily. Cohesion generally decreased, while the corresponding angles of internal friction increased with increase in lime/LBWA content.