A study on the properties of fibre reinforced laterized concretes
Ikponmwosa*, E. and Falade, F.
Department Of
Civil Engineering, University Of Lagos, Lagos, Nigeria.
E-mail:
efe_ewaen@yahoo.com
&
ffalade@hotmail.com
Abstract
This paper reports on a study of
strength properties of fibre reinforced laterized concretes. The
variables in this experimental work are: laterite content in the
concrete mix, which was varied from 0% to 100% at 10% interval;
curing ages - 7, 14, 21 and 28 days. The concrete mix of 1:2:4
(Cement: Laterite/Sand: Granite) was used with a constant
water/cement ratio of 0.65. The fibre content was kept at 2% at all
replacement levels with 0% fibre content as control experiment.
Three (3) 150mm cube specimens were cast and tested for each mix of
concrete with laterite content varied at 10% at the curing ages of
7, 14, 21 and 28 days. The specimens were cured in water at
temperature of 21o
1oC.
The average load at which a set of three specimens failed was
determined and used to compute the strength of each group of cubes.
A consistent trend of increase in values of strength with age was
observed in the specimens. A proportion of 45% laterite content as
replacement of sharp sand in concrete produced the highest
compressive strength. At 45% laterite content, a reduction of 18% in
cost of fine aggregate in concrete was obtained. Although the
strength characteristic of laterized concrete was found to be
generally lower than that of normal concrete, notwithstanding, the
strength is sufficient for use in normal concrete works.
Key words:
Compressive
strength, normal, fibre and laterized concretes. Water /cement
ratio.
