Test steps for water reducing rate of water reducing agent in concrete

The concrete ratio for testing water reduction rate is not the C30 concrete ratio. Measuring water reduction rate has nothing to do with concrete strength. If you have read the specificationMix proportionThe benchmark concrete mix proportion is designed according to JGJ55. The tested concrete mixed with non-air-entraining admixtures has the same proportion of cement, sand and stone as its corresponding benchmark concrete. The mix design should comply with the following regulations:

a) Cement dosage: reference concrete mixed with high-performance water-reducing agent or pumping agent and the subject concrete The unit cement dosage of concrete is 360kg/m3;the unit cement dosage of benchmark concrete and tested concrete mixed with other admixtures is 330kg/m3.

b) Sand rate: The sand rate of the benchmark concrete and the tested concrete mixed with high-performance water reducing agent or pumping agent are both 43% ~47%; the sand rate of the benchmark concrete and tested concrete mixed with other admixtures is 36% ~ 40%; but the sand rate of those mixed with air-entraining water-reducing agent or air-entraining agent The sand rate of the tested concrete should be 1% to 3% lower than the sand rate of the benchmark concrete.

c) Additive dosage: According to the dosage specified by the manufacturer.

d) Water consumption: The slump of the reference concrete and the tested concrete mixed with high-performance water-reducing agent or pumping agent is controlled at (210±10) mm, The water consumption is the minimum water consumption when the slump is (210±10) mm; the benchmark concrete and the tested concrete mixed with other admixtures is controlled at (80±10) mm. Water consumption includes the amount of water contained in liquid admixtures, sand and stone materials Have any questions? The proportions of the benchmark concrete and the tested concrete are the same. Just adjust them to the same slump, and then compare the water consumption. </p