INVESTIGATING THE EFFECTS OF WATER ADMIXTURES IN CONCRETE CONTAINING LOCAL CEMENT.

ABSTRACT
Due to current levels of major construction in Kenya, there is an ever increasing use for
admixtures. The demand and government encouragement to invest in cement manufacturing has
led to introduction of various brands of admixtures into the market. The lack of database on the
effects of the various water admixtures is a major drawback that faces the construction sector.
The research seeks to determine the properties of the concrete made from local cement and the
effects of the admixtures. An experimental approach has been taken to study the effect of the
constant water cement ratio and the effect of the using water admixture. This has been done by
using a designed mix ratio of 1:1:2 (C25/30) concrete for the four brands of cement. Two brands
of water admixture (Rheobuild 2000M and Pozzolith Standard) have been adopted. The
properties of these concrete mixes have been assessed by measuring both the fresh and hardened
state properties of the concrete mix.
The research has indicated that different mixes with and without water admixtures have varying
workability and compressive strengths. This may suggest various applications of water
admixtures. The use of admixtures showed that the used of admixtures can be used to achieve
high strength concrete with high workability hence reducing the costs of placing.

 

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