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首页> 外文期刊>Journal of Environmental Management >Permeability predictions for sand-clogged Portland cement pervious concrete pavement systems
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Permeability predictions for sand-clogged Portland cement pervious concrete pavement systems

机译：堵沙硅酸盐水泥透水混凝土路面系统的渗透性预测

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Pervious concrete is an alternative paving surface that can be used to reduce the nonpoint source pollution effects of stormwater runoff from paved surfaces such as roadways and parking lots by allowing some of the rainfall to permeate into the ground below. This infiltration rate may be adversely affected by clogging of the system, particularly clogging or covering by sand in coastal areas. A theoretical relation was developed between the effective permeability of a sand-clogged pervious concrete block, the permeability of sand, and the porosity of the unclogged block. Permeabilities were then measured for Portland cement pervious concrete systems fully covered with extra fine sand in a flume using simulated rainfalls. The experimental results correlated well with the theoretical calculated permeability of the pervious concrete system for pervious concrete systems fully covered on the surface with sand. Two different slopes (2% and 10%) were used. Rainfall rates were simulated for the combination of direct rainfall (passive runoff) and for additional stormwater runoff from adjacent areas (active runoff). A typical pervious concrete block will allow water to pass through at flow rates greater than 0.2cm/s and a typical extra fine sand will have a permeability of approximately 0.02cm/s. The limit of the system with complete sand coverage resulted in an effective system permeability of approximately 0.004cm/s which is similar to the rainfall intensity of a 30min duration, 100-year frequency event in the southeastern United States. The results obtained are important in designing and evaluating pervious concrete as a paving surface within watershed management systems for controlling the quantity of runoff.
机译：透水混凝土是一种可供选择的铺面，可用于通过允许部分降雨渗透到下面的地面中来减少路面（如道路和停车场）对雨水径流的非点源污染影响。系统的堵塞，特别是沿海地区的沙子堵塞或覆盖，可能会对渗透率产生不利影响。建立了一个理论上的联系，在一个沙堵塞的透水混凝土砌块的有效渗透率，沙子的渗透率和该未堵塞的砌块的孔隙率之间。然后，使用模拟降雨，对水槽中完全覆盖有特细砂的波特兰水泥渗透混凝土系统的渗透率进行了测量。实验结果与透水混凝土系统的理论计​​算渗透率有很好的相关性。使用了两个不同的斜率（2％和10％）。模拟了直接降雨（被动径流）和邻近地区其他雨水径流（主动径流）组合的降雨率。典型的透水混凝土砌块将允许水以大于0.2cm / s的流速通过，典型的特细砂的渗透性约为0.02cm / s。系统完全覆盖沙的极限导致有效的系统渗透率约为0.004cm / s，这与美国东南部持续30分钟，频率为100年的事件的降雨强度相似。获得的结果对于设计和评估透水混凝土作为流域管理系统内的铺路面以控制径流量非常重要。

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