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原文传递 Preliminary Procedure for Structural Design of Pervious Concrete Pavements

题名：	Preliminary Procedure for Structural Design of Pervious Concrete Pavements
作者：	Nassiri, S.; AlShareedah, O.
关键词：	Pervious concrete##Pavement thickness##Porosity##Compressive strength##Flexural strength##Pavement design##Recommendation##Washington State University##
摘要：	Pervious concrete (PC) is a pavement material that provides a porous medium to facilitate the infiltration of stormwater to the underlayers. With the increasing use of PC pavement nationwide, the mechanical properties of the material need to be established. To do so, PC specimens were prepared in various porosities, using two aggregate types. Hardened porosity, compressive, and flexural strength tests were carried out on all PC specimens. The test results from this study were supplemented by the results from past research studies conducted at Washington State University as well as those from literature to develop multi variable linear regression models to predict strength properties for pavement thickness design. Multi variable linear regression relationships between the PC compressive and flexural strength, hardened porosity, and mixture design parameters were established. Additionally, a recommended thickness design database was developed for low-traffic-volume PC pavements with different mechanical properties and under various traffic volumes and axle load configurations. The fatigue model for conventional Portland cement concrete was used to obtain the maximum allowable load repetitions for PC slabs with three different moduli of rupture. To obtain the fatigue life of PC, four traffic categories and axle loads were obtained from the American Concrete Institute (ACI)’s guide on the design of concrete parking lots. The applied stress by each axle load on PC slabs was obtained using a previously validated finite element model. Using the applied stress and different flexural strength values of PC, the fatigue life of PC slabs with various thicknesses and mechanical properties was generated. Based on the calculated fatigue life and the traffic volumes specified by ACI, a thickness design table was developed. The proposed thickness design table needs to be updated using a fatigue model for pervious concrete.
总页数：	46
报告类型：	科技报告