THE EFFECT OF ELAPSED TIME AFTER MIXING ON THE PROPERTIES OF MODIFIED LATERITE
THE EFFECT OF ELAPSED TIME AFTER MIXING ON THE PROPERTIES OF MODIFIED LATERITE
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Date
1993-06
Authors
OBEAHON, S.O.
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Abstract
This study is an investigation into the effect of
elapsed time after mixing on the properties of modified
laterite. The modifiers used are portland cement and hydrated
lime.
The laterite was modified with 1, 2 and 3 percent of
portland cement and hydrated lime. The elapsed time used for
this study ranges from 0 to 3hours, with tests conducted at
1.0 hour intervals.
Details of test methods and evaluation criteria are
given.
Preliminary result presented show that the laterite is
classified as an A-6 soil, whose properties are such that
they are not economically stabilizable or usable in their
natural state for pavement works.
Detail result presented show that with increased in
elapsed time after mixing, optimum moisture content, maximum
dry density, liquid limit, plasticity index, cohesion and
angle of internal friction decreased while the grain size and
plastic limit increased.
Based on the grain-size and plasticity criteria of the
Highway Research Board (HRB) limits for soils that can be
stabilized with portland cement, and the Millard and O'Reilly
free-flow criteria , the soil can be modified with 2% lime
and 3% cement. Also, considering the effect of elapsed time after mixing on
the modified laterite, acceptable modification is achieved at
2.0 hours for 1% lime and cement using the Highway Research
Board criteria and 1.0 hour for 1% lime and 3.0 hours for 1%
cement using the Millard and O'Reilly criteria.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL
AHMADU BELLO UNIVERSITY, ZARIA.
IN PARTIAL FULFILMENT OF THE REQUIREMENT FOR THE
DEGREE OF MASTER OF SCIENCE IN GEOTECHNICS.
DEPARTMENT OF CIVIL ENGINEERING
FACULTY OF ENGINEERING
AHMADU BELLO UNIVERSITY
ZARIA
Keywords
EFFECT,, ELAPSED TIME,, MIXING,, PROPERTIES,, MODIFIED LATERITE,