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Evaluation of recycled concrete with concrete coarse aggregate using ABCP mix design method modified

机译：改进ABCP配合比设计方法评价粗骨料再生混凝土。

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The use of recycled aggregate from construction and demolition waste is growing throughout the world. However, the adoption of a mix design method that does not take into account the type of recycled aggregate (RA), the best RA content in the mix proportion, and the best way to evaluate workability can hinder its application. Hence, the main goal of this study is to develop a specific mix design of recycled concrete, using the flow test on Graff's Table as a measure of workability. The mix design adopted was an adaptation of the ABCP (Brazilian Portland Cement Association) method. The RA proportions were 20% and 40%. In addition, the influence of two levels of flow test (350 mm and 400 mm) and three different mix design strength levels (25, 30 and 40 MPa) were also tested.The results showed it was necessary to make many experimental adjustments in the concrete mixtures determined by the ABCP method. On the other hand, the flow test on the Graff's table proved to be satisfactory as a measure of recycled concrete workability in this study. The two flow test levels evaluated had a significant influence on the compressive strength results, while the RA contents evaluated (20% and 40%) did not affect this property.
机译：来自世界各地的建筑废料和拆毁废料对再生骨料的使用正在增长。但是，采用不考虑回收骨料（RA）的类型，混合比例中最佳RA含量以及评估可加工性的最佳方法的混合设计方法可能会阻碍其应用。因此，本研究的主要目标是使用格拉夫表的流动试验作为可加工性的指标，来开发再生混凝土的特定配合比设计。采用的混合料设计是对ABCP（巴西波特兰水泥协会）方法的改编。 RA的比例分别为20％和40％。此外，还测试了两个水平的流动试验（350 mm和400 mm）和三个不同的混合设计强度水平（25、30和40 MPa）的影响，结果表明有必要在试验中进行许多实验调整。通过ABCP方法确定的混凝土混合物。另一方面，在本研究中，Graff表上的流动试验证明是可回收混凝土可加工性的令人满意的方法。评估的两个流动测试水平对抗压强度结果有显着影响，而评估的RA含量（20％和40％）不影响该性能。

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