EFFECT OFLOCUST BEAN WASTE ASH ON CEMENTMODIFIED BLACK COTTON SOIL.
EFFECT OFLOCUST BEAN WASTE ASH ON CEMENTMODIFIED BLACK COTTON SOIL.
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Date
2011-11
Authors
SALAWU, BABA.
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Abstract
Black cotton soil classified as an A-7-6 (24) soil on AASHTO classification collected
from new Marte area of Borno state was modified with up to 4% cement and LBWA up
to 8% by weight of the soil. The effect of locust bean waste ash (LBWA) on the cement
modified soil was studied with respect to particle size distribution , Atterberg limits,
compaction characteristics and shear strength parameters using three 3 compactive
efforts namely, British Standard light (BSl), West African Standard (WAS), and British
Standard heavy (BSh). Statistical analysis was then carried out on results obtained from
the test conducted to determine the significant difference (i.e., p < 0.05) in the various
soil - cement mixes using a two – way analysis of variance (ANOVA) with the
Microsoft Excel Analysis Tool Pack Software. Analyses of the results of the soil cement
mixtures considered indicate increase in particle sizes, increase in the liquid
limit and decrease in the plastic limit with corresponding increase in plasticity index,
increase in maximum dry density (MDD) with increase in optimum moisture content
(OMC) as well decrease in cohesion with increasing angle of internal friction all with
higher locust bean waste ash content. The result also showed that the modified soil met
the requirement of the Nigerian General Specification of not more than 35% passing
No. 200 sieve when used as a sub grade material in road construction. An optimal blend
of 4% cement / 8% LBWA is recommended for the modification of black cotton soil.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE
SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA IN
PARTIAL FULFILLMENT OF THE REQUIREMENT
FOR THE AWARD OF THE DEGREE OF MASTER OF
SCIENCE IN CIVIL ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING
FACULTY OF ENGINEERING
AHMADUBELLO UNIVERSITY
ZARIA, NIGERIA
NOVEMBER2011.
Keywords
EFFECT,, LOCUST BEAN,, WASTE ASH,, CEMENTMODIFIED,, BLACK,, COTTON,, SOIL.