COMPARATIVE ANALYSIS OF THE MECHANICAL RESPONSE OF CEMENT AND THE LOCAL DYE RESIDUE, OR KATSI, ON STABILIZE LATERITE FOR THE PRODUCTION OF NBRRI CSEBS. (KEY IJP************633)

• Idris Zakariyya Ishaq

Abstract

With laterite samples from the Dantata and Sawoe barrow pit, Kano State, Nigeria, the study reports the results of an investigation into the use of cement admixed with Katsi to stabilize laterite in the production of NBRRI CSEBS (Compressed stabilized Earth Blocks). The natural soil used in the work is an A-2-6) soil according to the AASHTO soil classification system or CL in the Unified Soil Classification System. The plastic limit and CBR of the soil generally increase with increase in katsi content. The MDD of the lateritic soil increases with increases in the MDD from 2.07 to 2.08 gcm3 at 0 to 5.0. but falls short of 5% katsi content. As the katsi concentration rises, the lateritic soil's OMC and CBR rise aswell. By weight replacement levels, the stabilizing agents were introduced at 2.5%, 5%, 7%, 5%, and 10%. The blocksabrasion resistance, water absorption capacity, and compressive strengths were evaluated. The average dry compressive strength at 28 days was 1.63 Nmm2, 2.60 Nmm2, 2.78 Nmm2, and 3.12 Nmm2, respectively, for cement stabilized blocks at 2.5%, 5%, 7.5%, and 10% stabilization, according to the results. In contrast, KATSI stabilized blocks had 0.92 Nmm2, 1.25 Nmm2, 1.15 Nmm2, and 0.94 Nmm2, respectively. According to the Nigeria Building and Road Research Institute (NBRRI, 2006), the minimum strength for the first 28 days shouldn't be less than 2Nmm2. This criterion was only met by cement stabilized blocks with stabilization levels of 10% and higher. However, up to 5% of each is sufficient for stabilization in order for katsi to function as an effective soil stabilizer. The impact of katsi on the compressive strength, shear strength, and permeability warrants more