Properties of concrete prepared with PVA-impregnated recycled concrete aggregates |
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| Authors: | Shi-Cong Kou Chi-Sun Poon |
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| Affiliation: | 1. Civil Engineering Department, The Hashemite University, Zarqa, Jordan;2. Civil Engineering Department, The University of Jordan, Amman, Jordan;1. Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. College of Civil Engineering, Hunan University, Changsha, Hunan, 410082, China;2. WOWA International Engineering & Consulting Co. Ltd, Shenzhen, Guangzhou, 518067, China;3. College of Civil Engineering and Mechanics, Central South University of Forestry and Technology, China;1. Magnel Laboratory for Concrete Research, Tech Lane Ghent Science Park, Campus A, Ghent University, Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium;2. Center for Microbial Ecology and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium;3. Heidelberg Cement, Belgium |
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| Abstract: | This paper reports an experimental study to improve the properties of recycled concrete aggregates (RCA) by their impregnation with polyvinyl alcohol (PVA). The effects of PVA on the development of strength and durability properties of the recycled aggregate concrete were evaluated. The experimental investigation was conducted in two parts. Firstly, the optimal concentration of PVA solution required to improve the recycled aggregates was determined. The RCA was soaked in 6%, 8%, 10%, 12% PVA solutions, and impregnation was conducted under a controlled laboratory environment. Density, crushing value (10% fines value), and water absorption of the PVA impregnated RCA (PI-RCA) were determined. Secondly, the slump, slump loss, compressive and tensile splitting strength, dimensional change (shrinkage) and chloride penetrability of the concretes prepared with the RCA that had been impregnated with the optimal (10%) PVA concentration were determined. It was found that the 10% fines value of the PI-RCA was higher, and the water absorption of the PI-RCA were lower when compared to the untreated RCA. The results show that there was not only an improvement in the mechanical properties of the concrete made with PI-RCA, but also the shrinkage of PI-RCA decreased while the resistance to chloride-ion penetration of the concrete produced increased. |
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