Mechanical Behavior of CFRP-Confined Recycled Fly Ash/Slag Based Geopolymer
Posted: 22 Jul 2019
Date Written: July 20, 2019
Although massive research has been conducted on the utilization of recycled aggregate in producing concrete, recycled aggregate concretehas so far been mainly limited to non-structural applications due to its well-known disadvantages including the relatively low stiffness and strength. To explore the potential applications of such material in structural members, lateral confinement such as using fiber-reinforced polymer (FRP) could be an effective way by significantly improving concrete strength and ductility. Thus,this paper presents the results of axial compression test on recycled aggregate concrete based on fly ash/slag geopolymer, namely geopolymeric recycled aggregate concrete (GRAC), confined by carbon FRP. GRAC, the combined utilization of environmentally-friendly geopolymer binders and recycled aggregate, is beneficial for the development of sustainable concrete, as well as alleviate the environmental issue caused by industrial by-product and construction and demolition waste.The objective of this study is to evaluate the mechanical properties of carbon FRP-confined GRAC under axial compression, such as the failure pattern, axial and lateral strain response, and ultimate strength. The main parameters in the test are the type of coarse aggregate (normal coarse aggregate or recycled coarse aggregate), the slag content, and the CFRP jacket stiffness. Research findings indicate that both the strength and deformation of GRAC confined by CFRP wrap are obviously improved.
Keywords: CFRP, Recycled aggregate, geopolymer, axial compression
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