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首页> 外文期刊>Journal of Solid Waste Technology and Management >PROPERTIES OF CONCRETE CONTAINING RECYCLED FINE AGGREGATE AND FLY ASH
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PROPERTIES OF CONCRETE CONTAINING RECYCLED FINE AGGREGATE AND FLY ASH

机译：再生细骨料和粉煤灰的混凝土性能

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摘要

This paper reports the properties of concrete containing recycled fine aggregate (RFA) and fly ash (FA) obtained from local source in Perth, Western Australia (WA). This study is consisted of two parts. In the first part, the properties of concrete containing 25, 50, 75 and 100% (by wt.) replacement of natural fine aggregate (NFA) with RFA are considered. In the second part, the effect of class F fly ash as partial replacement of cement on the properties of recycled concretes containing 25% and 50% RFA are evaluated. The fly ash is used as 30% and 40% replacement of cement. The properties of concrete evaluated are the compressive strength, indirect tensile strength, flexural strength and water absorption. All properties are measured at 7, 28 and 56 days. The results show that, better compressive, tensile and flexural strength of concrete can be obtained in recycled aggregate concretes containing up to 50% RFA as partial replacement of NFA. However, in the case of recycled aggregate concretes containing 30% and 40% fly ash the compressive strength is increase at 56 days and both compressive strength and tensile strengths are decreased at early ages. The flexural strength is increased in recycled aggregate concrete containing fly ash. It is observed that the water absorption is increased as RFA content increased. It is also observed that the water absorption is decreased significantly in recycled aggregate concretes containing fly ash at 56 days.
机译：本文报告了从西澳大利亚州珀斯（WA）的本地来源获得的包含再生细骨料（RFA）和粉煤灰（FA）的混凝土的性能。这项研究包括两个部分。在第一部分中，考虑了用RFA替代25％，50％，75％和100％（重量）天然细骨料（NFA）的混凝土的性能。在第二部分中，评估了F级粉煤灰作为水泥的部分替代品对含25％和50％RFA的再生混凝土的性能的影响。粉煤灰被用作水泥的30％和40％的替代品。所评估的混凝土的性能为抗压强度，间接抗张强度，抗弯强度和吸水率。所有属性均在第7、28和56天测量。结果表明，在含有高达50％RFA作为NFA的部分替代品的再生骨料混凝土中，可以获得更好的抗压，抗拉和抗弯强度。但是，对于含有30％和40％粉煤灰的再生骨料混凝土，其抗压强度在56天时会增加，而抗压强度和抗拉强度则会在早期老化时降低。含粉煤灰的再生骨料混凝土的抗弯强度提高。观察到，随着RFA含量增加，吸水率增加。还观察到，在第56天，含有粉煤灰的再生骨料混凝土的吸水率显着降低。

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