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Pervious Concrete Installation Process Step 1: Mixing
Pervious concrete is made up of cement, course aggregates, and water. The mixing process requires tight control of ingredient proportions, more so than that of conventional concrete. Only a narrow range of water content provides sufficient levels of both strength and porosity, so measurements must be exact.
Pervious concrete generally has a void content of 15-25%, with a .35-.45 water to cementitious materials (w/cm) ratio. Since this small proportion of water evaporates quickly, the mixture should be discharged completely within one hour of its initial mixing. This time frame can be extended by 50% or more with the inclusion of moisture-sustaining admixture chemicals in the mix.
>>Next Step: Placing
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