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Rheological and fresh properties of self-compacting concretes containing coarse and fine recycled concrete aggregates

机译：包含粗，细再生混凝土骨料的自密实混凝土的流变和新鲜性能

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In this study, the rheological and fresh properties of self-compacting concrete (SCC) using recycled concrete aggregate (RCA) as both coarse and fine aggregates have been investigated. SCC mixtures were prepared containing natural aggregate replacements at the levels of 0, 50 and 100% for coarse recycled concrete aggregates (CRCA) and in each series of mixtures fine recycled concrete aggregate (FRCA) replacements were varied at the levels of 0, 25, 50, 75 and 100%. In all concrete mixtures, 20% of cement content was replaced with fly ash (FA) and water-to-binder ratio (w/b) was used as 0.32. HerschelBulkley and modified Bingham models were adopted in this paper instead of traditional Bingham model to describe the rheological behaviour of SCC with'RCA indicating a non-linear and shear thickening behaviour due to lower yield stress close to zero. The influence of RCA replacements on the shear thickening behaviour of SCC was explained using the rheological analyses. The slump flow and T-500 time, V-funnel time and L-box height ratio tests were carried out to identify the effects of both CRCA and FRCA utilisations on the fresh properties of SCC. The results reveal that Herschel-Bulkley and modified Bingham models provide well defined rheological representations for SCC with RCA. The self-compactibility characteristics of the concretes are remarkably improved by the replacement levels of CRCA and FRCA used in SCC mixtures. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在这项研究中，研究了使用再生混凝土骨料（RCA）作为粗骨料和细骨料的自密实混凝土（SCC）的流变和新鲜性能。制备了SCC混合物，其中粗再生混凝土骨料（CRCA）的天然骨料替代品含量分别为0％，50％和100％，并且在每种混合物系列中，细再生混凝土骨料（FRCA）的替代品含量分别为0、25， 50、75和100％。在所有混凝土混合物中，用粉煤灰（FA）代替了20％的水泥含量，并且水灰比（w / b）为0.32。本文采用HerschelBulkley模型和改良的Bingham模型代替传统的Bingham模型来描述SCC的流变行为，RCA表示由于较低的屈服应力接近于零，因此具有非线性和剪切增稠行为。流变分析解释了RCA替代对SCC剪切增稠行为的影响。进行坍落度测试，T-500时间，V形漏斗时间和L箱高度比测试，以确定CRCA和FRCA利用对SCC新鲜特性的影响。结果表明，Herschel-Bulkley模型和改良的Bingham模型为带有RCA的SCC提供了定义明确的流变学表示。通过在SCC混合物中使用的CRCA和FRCA替代水平，混凝土的自密实性得到了显着改善。 （C）2016 Elsevier Ltd.保留所有权利。

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