Clogging in permeable concrete: A review

A modified method for the design of pervious concrete mix

Permeable concrete mixed with various admixtures

The ASTM C666 procedure is the common test method used for evaluating the freeze-thaw durability of conventional concrete, and it has been adapted for evaluating the freeze-thaw resistance of pervious concrete; however, it is argued the test method does not represent the field conditions of neither conventional nor pervious concrete This study mainly focused on an experimental program to evaluate the freeze-thaw durability of pervious concrete specimens using the JC446-91 test method, which measures the change in compressive strength and mass after exposure to freeze-thaw cycles, as an alternative for ASTM C666 Various parameters affecting the freeze-thaw durability of pervious concrete, namely water to cement ratio (W/C), air entrainment, inclusion of sand, and coarse aggregate size were experimentally examined, and the results were evaluated using statistical analysis It was observed that replacing 8% of coarse aggregate with sand and using a higher W/C resulted in higher strength and an improvement in the freeze-thaw durability Although the positive effect of air-entraining admixture (AEA) on freeze-thaw durability of pervious concrete has been manifested by previous researchers, it was not clearly observed in this study Also, change in coarse aggregate size did not significantly affect the strength and freeze-thaw durability of pervious concrete This study revealed that the conditions and number of cycles used in JC446-91 were inadequate to evaluate the freeze-thaw durability of pervious concrete, especially for strong mixes Therefore, considering the criticisms against ASTM C666 in representing field conditions of pervious concrete, more compatible and realistic test methods are required to evaluate the freeze-thaw durability of pervious concrete

Experimental evaluation of freeze-thaw durability of pervious concrete

Cement production accounts for approximately 5% of total global CO2 emissions from all human activities. In addition, the consumption of virgin aggregates for concrete infrastructure has created virgin material scarcity issues in many areas of the USA. High-performance green concrete (HPGC) with fly ash and recycled aggregates can help reduce the demand for material inputs and reduce pollution outputs associated with bulk material flow of urban concrete. Structural and durability tests showed that HPGC containing fly ash and 50% recycled aggregate (100% of the coarse aggregate fraction) performed equally or better than 100% ordinary Portland cement concrete with the same cementitious content. Durability improvements were more significant with Class F than Class C fly ash. For both Class F and Class C fly ash, greater per cent replacement of Portland cement with fly ash led to slower and lower strength gain, but still within acceptable strength criteria for Colorado Department of Transportation Class B con...

Angela Susan Hager

Papers

Sustainable design of pervious concrete pavements