In construction site, ready mixed used only large scale work
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In construction site, ready mixed used only large scale work
Concrete supplied from RMC has either more slump than specified or has
become stiff making it difficult to pump. Doubts will always be raised if the
concrete supplied at site has more slump than specified. Addition of water
during transit can be suspected which is bound to affect the quality of
concrete. Concrete loosing workability making it difficult to pump is another area of concern.
In such cases, water added to make concrete pumpable which
again affects quality of concrete. Re-dosing of admixture, if adopted, has to
be done under technical supervision following recommendation of
manufacturer of admixture. Otherwise it may lead to delayed setting of concrete.
Delay in setting of concrete- Generally the admixtures / Retarders are used to
delay the setting time due to transit time involved is more. Excess dosage of
set retarding admixture may cause the delay in setting time substantially.
Hence, it is necessary to arrive at optimum dosage of set retarding admixture
such that there is no undue delaying than required. This will also establish the
compatibility between cement and admixture.
Requirement of good formwork- Since the placement speed of concrete is
more the formwork required shall be strong enough to sustain the load of
fresh concrete.