Performance of Pervious Portland Cement Concrete by Field and Laboratory Testing,Including Void Structure, Unit Weight,Compressive and Flexural Strength

摘要

Titan Virginia Ready Mix (TVRM) sponsored a study involving field and laboratory testing on numerous placement segments of the 4700 yd~3 (8 acres) of pervious pavement supplied to the Prime Outlet Mall project in Williamsburg, Virginia, 2008. The intent of the study was to gather a statistically sufficient quantity of test data of plastic and hardened properties using ASTM test standards from a project large in square footage to provide such data. The TVRM approach involved representative sampling, plastic and hardened density testing, void % determination, thickness measurements, and compressive and flexural strength testing. The hardened test specimens were obtained by coring and sawing from precast panels cast onsite during pavement production. The test panels measuring 3 ft × 3 ft × 6 in. in depth had supporting bottoms and was cast from composite samples obtained at the project site. The test panels were cast and cured in the same manner as the pervious pavement, one test panel for every 150 to 200 yd~3. The test panels were cured a minimum of 7 days to promote the necessary aggregate/ cement paste bond development as is referenced in ACI 522.1-08 [ACI 522-1, "Specification for Pervious Concrete Pavement," American Concrete Institute, Farmington Hills, MI, 2008]. Once the curing was complete the pervious test panels were cushioned, and transported to the TVRM laboratory for further curing and hardened strength and density testing. The TVRM objective was to compile enough raw data with consistent test results to help designers and specifiers in designing for future pervious projects.