實驗室評估多孔隙瀝青混凝土鋪面之透水性

Laboratory Evaluation of Permeability of Porous Asphalt Concrete

陳建旭(Jian-Shiuh Chen) ； 孫揚洲(Yang-Chou Sun) ； 黃建中(Chien-Chung Huang) ； 陳永全(Yung-Chuan Chen)

《中國土木水利工程學刊》 25卷3期 (2013/09) Pp. 241-249

https://doi.org/10.6652/JoCICHE.201309_25(3).0006

摘要

多孔隙瀝青混凝土（porous asphalt concrete，PAC）鋪面的透水功能取決孔隙率多寡，然而PAC鋪面透水功能會隨著使用年限的增加而逐漸下降，以鋪面孔隙堵塞最為公路工程師所注意，孔隙阻塞物可能來自於道路砂塵、車輛挾帶之砂泥與磨損之粒料等，對PAC鋪面排水功能影響甚鉅。本研究主要目的探討鋪面黏結材、鋪面厚度及堵塞現象對PAC鋪面透水功能之影響，經過定水頭、變水頭、水平向、垂直向及孔隙堵塞等多項透水試驗，研究結果顯示不同瀝青黏結料PAC之滲透係數沒有明顯差異，添加纖維並未對PAC之孔隙結構有顯著影響。PAC之透水量與試體厚度成正比，且水平滲透係數（KH）大於垂直滲透係數（KV）之趨勢，當水平向排水速率明顯不及垂直向，容易造成鋪面排水不及；PAC滲透係數隨著堵塞量增加而有降低之趨勢，且PAC試體厚度越大，滲透係數損失率越大，經過多次堵塞、清洗循環程序之試驗，滲透係數最後達到一定之穩定值。

關鍵字

多孔隙瀝青混凝土 ； 透水性 ； 孔隙堵塞

並列摘要

The permeable features of porous asphalt concrete (PAC) depends on the porosity of pavements; however, the functional life of PAC might gradually decrease due to clogging. Dust and debris could fill the void structure, causing the PAC layer to become clogged. In order to design porous asphalt concrete that is less susceptible to clogging, it is important to evaluate the influence of pavement thickness, bonding materials and air void reduction on the functionality of PAC. Experimental tests conducted in this study included constant head, variable head, horizontal, and vertical permeability, and pore clogging. Results indicated PAC made of various types of asphalt showed no significant difference in the coefficient of permeability. The addition of fibers in PAC had little impact on its permeability. The increase in specimen thickness led to an increase in the amount of water permeable into PAC. The horizontal permeability (KH) was greater than the vertical permeability (KV). When the KH value was lower than the KV value, it was likely to result in clogging. The permeability coefficient of PAC decreased with the increasing content of clogging materials. The greater the PAC specimen thickness, the higher reduction in the permeability coefficient. After several clogging and cleaning periods of testing, the permeability of PAC gradually reached a stable value.

並列關鍵字

porous asphalt concrete ； permeability ； pore clogging