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Requirements for Wash Water for Using in Ready-Mixed Concrete(Part-1)

We have discussed an important post about water quality to be used in concrete mixing. We know that the quality should be potable and many other chemical and biological aspects also should consider in permitting water to be used in mixing of concrete. Now question is wash out water can be used in further concreting operation.

The wash water received from washout operations of mixer can be used if it complies with limit stated in table-1 provided below. This table provides limits for physical test of questionable water.

Table-1: the criteria for accepting wash water supply
Criteria for accepting wash water supply for Using in ready mixed concrete
Regarding application of air-entrainment and chemical admixtures of other forms ASTM C94/C94M-00 provides that special attention should pay to determine the rate of dosages and sequence of batching. These determined amount and sequences should apply to consecutive batches.


ASTM C94/C94M specifies the requirement for ready mixed concrete. We will publish numerous post regarding requirements and specifications for ready mixed concrete. For convenience of reader we will sometimes provide combination of ASTM and ACI specifications for particular topics regarding ready mixed concrete.

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