Abstract
Pervious concrete is considered to be porous concrete because of its pore structure and excellent permeability. In general, larger porosity will increase the permeability coefficient, but will significantly decrease the compressive strength. The effects of water-cement ratio, fiber types, and fiber content on the permeability coefficient, porosity, compressive strength, and flexural strength were investigated. The pore tortuosity of the pervious concrete was determined by volumetric analysis and two-dimensional cross-sectional image analysis. The concept and calculation method of porosity tortuosity were further proposed. Results show that the permeability coefficient of the pervious concrete is the most suitable with a water-cement ratio of 0.30; the water permeability of the pervious concrete is influenced by fiber diameter. The permeability coefficient of pervious concrete with polypropylene thick fiber (PPTF) is greater than that with copper coated steel fiber (CCF) and the polypropylene fiber (PPF). The permeability coefficient is related to tortuosity and porosity, but when porosity is the same, the permeability coefficient may be different. Finally, general relations between the permeability coefficient and porosity tortuosity are constructed.
Highlights
Concrete is the most widely used material in civil infrastructure systems, and low strength concrete is usually used in earth rock dams, water-retaining walls, and other constructions [1,2]
Wu [18] indicated that the addition of waste fibers had no significant effect on the compressive strength of the recycled aggregate pervious concrete, but it can enhance the flexural by 43%
When polypropylene thick fiber (PPTF) was 3 kg/m3, with the increase of the water-cement ratio, the permeability coefficient first increased by 12.02%, and the increase of the water-cement ratio, the permeability coefficient first increased by 12.02%, and it decreased
Summary
Concrete is the most widely used material in civil infrastructure systems, and low strength concrete is usually used in earth rock dams, water-retaining walls, and other constructions [1,2]. A study by Haselbach [13] found that porosity varies with changes in the water-cement ratio and compressive strength, and with changes in the pavement depth. This vertical pore distribution is caused by the surface compaction of the pervious concrete, which causes the top of the pavement to be denser than the bottom. Wu [18] indicated that the addition of waste fibers had no significant effect on the compressive strength of the recycled aggregate pervious concrete, but it can enhance the flexural by 43%. This research can further promote the understanding and application of pervious concrete
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