Zhu Haitang, Wen Chengcheng, Wang Zhanqiao, Li Lan
School of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, China.
School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China.
Materials (Basel). 2020 Jan 10;13(2):321. doi: 10.3390/ma13020321.
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.
由于其孔隙结构和优异的渗透性，透水混凝土被认为是多孔混凝土。一般来说，较大的孔隙率会增加渗透系数，但会显著降低抗压强度。研究了水灰比、纤维类型和纤维含量对渗透系数、孔隙率、抗压强度和抗弯强度的影响。通过体积分析和二维横截面图像分析确定了透水混凝土的孔隙曲折度。进一步提出了孔隙曲折度的概念和计算方法。结果表明，水灰比为0.30时，透水混凝土的渗透系数最合适；透水混凝土的透水性受纤维直径的影响。聚丙烯粗纤维（PPTF）透水混凝土的渗透系数大于镀铜钢纤维（CCF）和聚丙烯纤维（PPF）透水混凝土的渗透系数。渗透系数与曲折度和孔隙率有关，但当孔隙率相同时，渗透系数可能不同。最后，建立了渗透系数与孔隙曲折度之间的一般关系。
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