INVESTIGATION INTO THE POSSIBLE USE OF POWDERED BURNT BRICK (PBB) AND ORDINARY PORTLAND CEMENT (OPC) ADMIXTURE FOR SANDCRETE BLOCKS PRODUCTION
INVESTIGATION INTO THE POSSIBLE USE OF POWDERED BURNT BRICK (PBB) AND ORDINARY PORTLAND CEMENT (OPC) ADMIXTURE FOR SANDCRETE BLOCKS PRODUCTION
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Date
1996-07
Authors
BUNGWON, HARUNA DUTSE
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Abstract
The thesis is essentially a comparative investigation between using Ordinary Portland
Cement (OPC) and an admixture (blended cement of Portland cement (OPC) and Powdered
Burnt Brick (PBB). It was directed at ascertaining the suitability or otherwise of the blended
cement for use in the production of sandcrete blocks as OPC is used.
Three sets of trial mixes of varied composition were produced to determine
parameters like optimum water/cement ratio, optimum percentage replacement by weight of
the OPC by the PBB It was also used to determine the effect of varying the
aggregates/cement ratio. A number of other tests carried out to ascertain properties of
specimens produced are as follows.
Compressive strength determined for various ages ranging between 3 days and 90
days were found to be generally high. For instance the 28th day strength of specimens for
a mix of 1:6 gave a strength of not less than 87% of the 0% replacement when the OPC was
replaced by 20% PBB.
Split tensile strength, obtained varied between 8 - 11% of the compressive strength
of the same mix ratio at 28 days Mixes with the PEJB have higher tensile values than those
without.
The setting time test revealed that mixes with 0% replacement have bigger initial
setting times than those with 10% and 20% replacement But the former have smaller - final
setting time than the latter.
Since the optimum percentage replacement of the OPC by the PBB is only 20, the cost
saving might be small but other advantages like low heat of hydration, high tensile strengths,
pride of an additional local material that can be used abound.
It was observed that mortar mixes with 20% replacement of OPC by PBB mixes
developed strengths that compared favourably with the mortar mixes with 0%replacement.
The application of the former in mortars was also recommended in line with the present use
of the later.
Description
Being a thesis submitted to the Postgraduate School,
Ahmadu Bello University, Zaria, in partial fulfillment
of the requirements for the award of Master of Science
Degree in Construction Technology
Department of Building
Ahmadu Bello University
Zaria - Nigeria
Keywords
INVESTIGATION,, POWDERED,, BURNT,, BRICK,, CEMENT ,, ORDINARY,, PORTLAND,, ADMIXTURE,, SANDCRETE,, BLOCKS,, PRODUCTION,