Exploring a High Strength Paste with Suitable Rheological Properties for Pervious Concrete

Flooding in urban areas is deteriorated due to increased urbanization, concentrated rainfall and impervious pavements. The pervious concrete (Per-C) is prominent in alleviating a significant runoff burden due to impermeable pavement. However, the application of Per-C is limited because of its lower strength to maintain high porosity. This project aims to produce pervious concrete that is able to achieve high strength, by utilizing high strength paste with appropriate rheological properties. A series of experiments including compressive strength, flexural strength, and mini-slump tests were conducted to explore higher-strength paste which can thoroughly and evenly wrap the aggregates. The proportions of paste with optimum performance was identified by orthogonal test, which includes silica fume (SF), ground granulated blast furnace slag (GGBS), and fly ash (FA).