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Influence of industrial by-products and waste paper sludge ash on properties of recycled aggregate concrete

机译：工业副产品和废纸污泥灰对再生骨料混凝土性能的影响

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This paper examines the mechanical properties and durability of recycled aggregate concrete (RAC) containing 100% coarse recycled concrete aggregate (RCA) and industrial by-products. The by-products, including waste paper sludge ash (PSA), fly ash (FA), silica fume (SF), and metakaolin (MK) of different proportions (5%, 10%, 15%) in RAC, were used in two methods: replacement and addition methods. The use of by-products (mineral admixtures) to mitigate the low quality of RAC was demonstrated through experimental outcomes in this study. The addition of industrial by-products was presented as a promising alternative for the addition of more Portland cement in RAC to enhance RAC's quality. The results showed that the strength and durability of RAC containing mineral admixtures in the addition method were higher than the addition of more cement or the replacement method. Notably, PSA considerably improved the mechanical properties of RAC at an early age, and it substantially improved the resistance of RAC to acid and sulfate attacks. At 90 days, FA and MK improved mechanical properties of RAC greater than SF and PSA did. Among combinations, the proportions of by-products in RAC of 5% PSA, 10% SF, 15% MK and 15% FA can produce the highest performance of RAC with 100% coarse recycled concrete aggregate (RCA). (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文研究了含有100％粗再生混凝土骨料（RCA）和工业副产品的再生骨料混凝土（RAC）的机械性能和耐久性。副产品包括RAC中不同比例（5％，10％，15％）的废纸污泥灰（PSA），粉煤灰（FA），硅粉（SF）和偏高岭土（MK）。两种方法：替换和添加方法。通过本研究的实验结果证明了使用副产品（矿物混合物）减轻RAC的低质量。提出添加工业副产品是在RAC中添加更多波特兰水泥以提高RAC质量的有前途的替代方法。结果表明，添加RAC的矿物掺合料的强度和耐久性高于添加更多水泥或替代方法。值得注意的是，PSA在早期就极大地改善了RAC的机械性能，并且大大提高了RAC对酸和硫酸盐侵蚀的抵抗力。在90天时，FA和MK改善了RAC的机械性能，优于SF和PSA。在各种组合中，RAC中的副产物所占比例为5％PSA，10％SF，15％MK和15％FA可以使RAC具有100％的粗再生混凝土骨料（RCA）的最高性能。 （C）2019 Elsevier Ltd.保留所有权利。

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