AN INVESTIGATION INTO THE EFFECTS OF AN ACCELERATING ADMIXTURE (CALCIUM CHLORIDE) IN THE PROPERTIES OF CONCRETE

ABSTRACT
This research projects seeks to study and experiment the effects and long term results of an accelerating admixture (calcium chloride) of different percentages(1%, 2%, 4%) by weights of cement used when mixed with concrete ingredients (coarse and fine aggregates, cement and water).
The following aspects affected by the calcium chloride were tested and determined in the
concrete laboratory: workability,overall compressive and tensile strength,the setting times of cement and,the rate of strength gain for the concrete.
It was found out that calcium chloride admixture increases the workability of concrete since it increased the compaction of the concrete samples and it also improved the compressive and tensile strength gain of the concrete. Calcium chloride reduced the setting times of the concrete making the cement set much faster than a normal cement without an admixture.Furthermore, Calcium chloride made the concrete harden fast.
for the above reasons, the use of calcium chloride is generally recommended especially in
situations of cold weather to reduce the time required for proper curing and protection and
most importantly to increase the rate of early strength development so as to permit earlier
removal of forms and earlier opening of the construction for service, but care should be takenas to the percentage of the calcium chloride admixture to be used to avoid corrosion
problems of the reinforcements in concrete.

 

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