Permeability measurement and scan imaging to assess clogging of pervious concrete pavements in parking lots
Permeability measurement and scan imaging to assess clogging of pervious concrete pavements in parking lots
复制标题
DOI：
10.1016/j.jenvman.2011.09.021
复制
发表时间：
2012-03-01
影响因子：
8.7
通讯作者：
Muhunthan, Balasingam
中科院分区：
文献类型：
--
作者：
Kayhanian, Masoud;Anderson, Dane;Muhunthan, Balasingam
本文介绍了一项研究，使用渗透性测量沿着的物理和水文特性的20个透水混凝土路面在整个加州停车场。在五个位置测量渗透率：主入口，没有交通的区域，以及每个停车场的停车位内的三个单独测量。还收集了每个停车场的水文和物理场地特征，如交通流量、侵蚀、植被覆盖、沉积物积累、维护实践、裂缝存在情况、降雨量和温度数据。这些数据用于进行详细的统计分析，以确定影响渗透率变化的因素，从而评估堵塞的可能原因。此外，从四个不同的停车场获得了七个代表性的岩心样品，渗透率从很低到很高。通过CT扫描得到的孔隙率剖面图被用来评估可能的堵塞性质和程度。结果表明，每个停车场内和不同停车场之间的渗透率存在很大差异。一般来说，停车场的年龄是影响渗透率的主要因素。统计分析表明，细颗粒泥沙（小于38 μ m）质量也是一个重要的影响因素。其他显著性较低的影响因素包括温度大于30摄氏度的天数和停车场旁边的植被数量。结合扫描图像分析和岩心孔隙率剖面显示，大多数堵塞发生在路面表面附近。虽然较低的孔隙度一般似乎仅限于上部25毫米，但在一些岩心样品中，在地表以下100毫米处发现了较低孔隙度的证据。(C)2011爱思唯尔有限公司保留所有权利。
This paper describes a study that used permeability measurement along with physical and hydrological characteristics of 20 pervious concrete pavements in parking lots throughout California. The permeability was measured at five locations: the main entrance, an area with no traffic, and three separate measurements within a parking space at each parking lot. Hydrological and physical site characteristics such as traffic flow, erosion, vegetation cover, sediments accumulation, maintenance practice, presence of cracking, rainfall, and temperature data were also collected for each parking lot. These data were used to perform detailed statistical analysis to determine factors influencing changes in permeability and hence assessing possible cause of clogging. In addition, seven representative core samples were obtained from four different parking lots with permeability ranging from very low to very high. Porosity profiles produced from CT scanning were used to assess the possible nature and extent of clogging.Results showed that there is a large variation in permeability within each parking lot and between different parking lots. In general, the age of the parking lot is the predominant factor influencing the permeability. Statistical analysis revealed that fine sediment (particles less than 38 mu m) mass is also an important influencing factor. Other influencing factors with lower significance included number of days with a temperature greater than 30 degrees C and the amount of vegetation next to the parking lot The combined scanned image analysis and porosity profile of the cores showed that most clogging occurs near the surface of the pavement. While lower porosity generally appeared to be limited to the upper 25 mm, in some core samples evidence of lower porosity was found up to 100 mm below the surface. (C) 2011 Elsevier Ltd. All rights reserved.