Evaluation of Mix Designs and Test Procedures for Pervious Concrete.

摘要

The District Department of Transportation (DDOT) is committed to mitigating stormwater runoff and improving the water quality in the rivers of the metropolitan area. To this end a number of strategies have been developed or are under consideration, including the use of pervious concrete pavements. Pervious concrete is a mixture of Portland cement, aggregate, and water that provides a level of porosity that allows water to percolate into the subgrade. The general literature suggests that in addition to reducing the quantity of runoff water and improving water quality, pervious concrete could also enhance pavement skid resistance, especially during storm events by rapidly draining rainwater. Quality control and quality assurance for job mix verifications and testing for pervious concrete is not covered in the Standard Specifications for Highways and Structures of the District of Columbia. It is also addressed by neither the American Society for Testing and Materials (ASTM) nor the American Association of State Highway and Transportation Officials (AASHTO). To address this gap, this study developed internal guidelines for quality control of field sampling and testing of pervious concrete mixes for acceptance.