In areas where compaction is required, there must be at least 1' above the pipe before compaction with mechanical means.
Compaction refers to the mechanism which expels entrapped air from freshly placed concrete and packs together the aggregate particles so as to maximize the density of concrete. Compaction significantly increases the ultimate strength of concrete and enhances the bonding with reinforcement. In simple terms, compaction occurs when particles are pressed together in order to reduce the space between them. In areas where compaction is needed, it is kept into consideration that there must be at least 1' above the pipe before compaction is performed.
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