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→Application: clarified: reason for cracking of concrete when rebar corrodes |
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When fresh concrete is delivered to a site by a truck mixer it is sometimes necessary to check its consistence before pouring it into [[formwork]].
If the consistence is not correct, the concrete will not have the desired qualities once it has set, particularly the desired strength. If the concrete is too pasty, it may result in cavities within the concrete which leads to [[corrosion]] of the [[rebar]], eventually leading to the formation of cracks (as the rebar expands as it corrodes) which will accelerate the whole process, rather like insufficient [[concrete cover]]. Cavities will also lower the stress the concrete is able to support.
During the test the site engineer should be present.
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