Chemical Admixture System for Pervious Concrete

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Title: Chemical Admixture System for Pervious Concrete

Author(s): E. Koehler, M. Offenberg, J. Malone, and A.A. Jeknavorian

Publication: Special Publication

Volume: 262

Issue:

Appears on pages(s): 273-286

Keywords: high-range water reducer; pervious concrete; retarder; viscosity-modifying admixture; workability.

Date: 10/1/2009

Abstract:
Pervious concrete contains a high void content to allow the passage of water and is often used in pavements to reduce storm water runoff and ponding, improve water quality, and recharge groundwater. Successful pervious concrete for pavement applications must be quickly discharged from a ready mixed concrete truck, achieve consistent compaction without paste draining to the bottom of the pavement, allow sufficient time before the application of curing, and achieve adequate strength and durability. Obtaining these properties requires unique paste rheology and setting characteristics, which are enabled through the proper selection of chemical admixtures. In this paper, novel lab tests are used to quantify the effects of individual admixtures; namely a retarder, polycarboxylate-based high-range waterreducer, and bio-gum type viscosity modifying admixture. The benefits of using a combination of these three admixtures are demonstrated.