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Experimental investigation of recycled aggregate effect on the concrete properties

机译：再生骨料对混凝土性能影响的试验研究

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Purpose - The purpose of this paper is to conduct a laboratory investigation on measuring the tensile strength of recycled concrete using a double punch test. Furthermore, one of the main goals of this study is to compare the tensile and compressive strengths of recycled concrete samples. Design/methodology/approach - Recycled concrete samples were made with variables such as aggregate type (natural stone and aggregate recycled concrete), different water-to-cement ratios and different treatment conditions in the first stage. In the next stage, the double punch test was performed on them, and finally the results obtained from experiments were analyzed and investigated. Findings - According to the above tests, it was concluded that: first, according to the laboratory results, the strength of concrete containing recycled aggregates becomes closer to the strength of concrete containing natural aggregates whenever the water-to-cement ratio is higher. Second, upon investigating the treatment conditions, it was observed that the treatment had a greater effect on the strength of the recycled concrete. However, this effect was less tangible in tensile strength. Third, upon investigating the results of tensile strength, it can be said that the Barcelona test results were closer to the direct tensile test results compared to the Brazilian test results. This indicates the higher viability of Barcelona's test results. Fourth, the results obtained from the Barcelona tensile test for recycled concrete were closer to the results of the direct tensile test compared to the concrete containing natural aggregates, which suggests that the Barcelona test is more suitable as a tensile test for recycled concrete. Fifth, the effects of various factors on tensile strength were somewhat less compared to the compressive strength, although very close. Sixth, the relationships provided by the regulation for concrete tensile strength on compressive strength were highly inconsistent with the results obtained from the direct tensile test, for which the consistency was higher for concrete containing natural aggregates compared to recycled concrete. Seventh, the dispersion of results obtained from tensile tests was higher for recycled concrete compared to concrete containing natural aggregates, but lesser of this dispersion was observed in the compressive strength. Originality/value - According to the laboratory results, the strength of concrete containing recycled aggregates becomes closer to the strength of concrete containing natural aggregates whenever the water-to-cement ratio is higher. Upon investigating the treatment conditions, it was observed that the treatment had a greater effect on the strength of the recycled concrete. However, this effect was less tangible in tensile strength. On the basis on the results of the tensile strength, it can be said that the Barcelona test results were closer to the results of the direct tensile test compared to those of the Brazilian test. This indicates the higher viability of Barcelona's test results. The results obtained from the Barcelona tensile test for recycled concrete were closer to the results of direct tensile test compared to the concrete containing natural aggregates, which suggests that the Barcelona test is more suitable as a tensile test for recycled concrete. The effects of various factors on tensile strength were somewhat less compared to the compressive strength, although very close. The relationships provided by the regulation for concrete tensile strength on compressive strength were highly inconsistent with the results obtained from the direct tensile test, for which the consistency was higher for concrete containing natural aggregate compared to recycled concrete. The dispersion of results obtained from tensile tests was higher for recycled concrete compared to concrete containing natural aggregate, but lesser of this dispersion was observed in the compressive strength. Laboratory studies; 3A recycled concrete; Double punch test; Tensile and compressive strength
机译：目的-本文的目的是进行实验室研究，以使用双冲头试验测量再生混凝土的拉伸强度。此外，这项研究的主要目标之一是比较再生混凝土样品的拉伸和压缩强度。设计/方法/方法-在第一阶段，使用诸如骨料类型（天然石材和骨料再生混凝土），不同的水灰比和不同的处理条件等变量来制作再生混凝土样品。在下一步中，对它们进行双打孔测试，最后对从实验中获得的结果进行分析和研究。发现-根据上述测试得出的结论是：首先，根据实验室结果，每当水灰比较高时，包含再生骨料的混凝土的强度就会接近包含天然骨料的混凝土的强度。其次，在研究处理条件时，观察到处理对再生混凝土的强度有更大的影响。但是，这种效果在拉伸强度上不太明显。第三，在研究抗拉强度的结果时，可以说巴塞罗那测试结果与巴西测试结果相比更接近直接拉伸测试结果。这表明巴塞罗那的测试结果具有更高的可行性。第四，与含有天然骨料的混凝土相比，从巴塞罗那再生混凝土的拉伸试验获得的结果更接近直接拉伸试验的结果，这表明巴塞罗那试验更适合作为再生混凝土的拉伸试验。第五，尽管抗拉强度非常接近，但与抗压强度相比，各种因素对抗拉强度的影响要小一些。第六，混凝土抗拉强度法规与抗压强度之间的关系与直接抗拉试验的结果高度不一致，与直接再生试验相比，含天然骨料的混凝土的稠度更高。第七，与包含天然骨料的混凝土相比，再生混凝土的拉伸试验所得结果的分散性更高，但在抗压强度方面观察到的分散性较小。原创性/价值-根据实验室结果，每当水灰比较高时，包含再生骨料的混凝土的强度就会接近包含天然骨料的混凝土的强度。在研究处理条件时，观察到处理对再生混凝土的强度影响更大。但是，这种效果在拉伸强度上不太明显。根据抗拉强度的结果，可以说巴塞罗那测试的结果比巴西测试的结果更接近直接拉伸测试的结果。这表明巴塞罗那的测试结果具有更高的可行性。与含有天然骨料的混凝土相比，从巴塞罗那再生混凝土的拉伸试验获得的结果更接近直接拉伸试验的结果，这表明巴塞罗那试验更适合作为再生混凝土的拉伸试验。尽管非常接近，但与抗压强度相比，各种因素对拉伸强度的影响要小一些。规定的混凝土抗拉强度与抗压强度之间的关系与直接抗拉试验的结果高度不一致，与直接再生试验相比，含天然骨料的混凝土的稠度更高。与包含天然骨料的混凝土相比，对于再生混凝土，拉伸试验所得结果的分散性更高，但在抗压强度方面观察到的分散性较小。实验室研究； 3A再生混凝土；双打孔测试；拉伸和抗压强度

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