https://orcid.org/0000-0003-1512-9803
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ABSTRACT
In this research, a natural kenaf geogrid was used to reinforce recycled concrete aggregate (RCA) as a base/subbase material. The interface shear behavior of kenaf geogrid-reinforced RCA was investigated using a large-scale direct shear test (LSDT). The influence of aperture sizes of geogrid, gradations of RCA, and normal stress on the interface friction angle (δ) and adhesion (ca) of kenaf geogrid-reinforced RCA was evaluated. The interface shear strength of kenaf geogrid-reinforced RCA were found to be dependent upon the gradation of RCA and the aperture size of kenaf geogrids (D). The higher D resulted in the higher δ, while exhibited less effect on ca of the large-sized RCA samples. Furthermore, it was found that the higher D resulted in the higher ca of the small-sized RCA samples and indicated less influence on the δ. A practical correlation between the interface shear strength coefficient (α) and D/FD ratio, where FD is RCA particles finer than D, is proposed for the rapid estimation of the interface shear strength between the kenaf geogrid and RCA. The outcome of this research will lead to the promotion of using kenaf geogrids as a natural reinforcement in waste RCA for sustainable pavement base/subbase applications.
摘要
本研究以天然红麻土工格栅为基材，以再生混凝土集料（RCA）为基材。采用大型直剪试验（LSDT）研究了红麻土工格栅增强RCA的界面剪切性能. 研究了土工格栅孔径、RCA级配和法向应力对红麻土工格栅增强RCA界面摩擦角δ和粘结力RCA的影响. 红麻土工格栅增强RCA的界面抗剪强度与RCA的级配和红麻土工格栅的孔径大小有关. D值越高，δ值越高，而对大尺寸RCA样品的RCA值影响较小. 此外，还发现D值越高，小尺寸RCA样品的值越高，对δ的影响越小. 为了快速估算红麻土工格栅与RCA的界面抗剪强度，提出了界面抗剪强度系数（α）与D/FD比值的实用关系式，其中FD是比D细的RCA颗粒. 这项研究的结果将促进使用红麻土工格栅作为天然增强材料，用于可持续的路面基层/底基层应用.