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Evaluation of high-strength concrete made with recycled aggregate under effect of well water

机译：用井水效果的再生骨料制造的高强度混凝土评价

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In the present study, the influence of using recycled coarse aggregate (RCA) and well water (WW) on the mechanical characteristics of high-strength concrete were investigated. The reuse of devastated structures as recycled aggregate became an especially serious issue in Mosul City, Iraq, following the 2017 war. These events have also made it difficult to access drinking water. This study sought to determine the effect of the more readily available well water in Mosul City when combined with recycled aggregate on compressive, splitting, and flexural strengths of high-strength concrete. The mixtures were prepared using four different percentages of RCA, replacing 0 %, 25 %, 50 %, and 100 % natural coarse aggregate (NCA). In total, eight mixtures were designed, four mixtures cured by potable water (PW), and the other four mixtures cured by well water. The results showed the compressive strength decreases by about 16.0 % when using well water for concrete made with NCA. Also using WW caused drop about 13.2 %, 10.0 % and 8.5 % for concrete containing 25 %, 50 % and 100 % RCA, respectively. The flexural and splitting tensile strength also reduced when using well water. A regression analysis allowed the formulation of new material constitutive relationships for high-strength concrete, including the effects of WW and RCA.
机译：在本研究中，研究了使用再生粗骨料（RCA）和井水（WW）对高强度混凝土机械特性的影响。在2017年战争之后，伊拉克Mosul City的回收结构重用了毁灭性的结构，这是一个特别严重的问题。这些事件也使得难以进入饮用水。该研究试图在摩苏尔城结合循环骨料与高强度混凝土的抗压，分裂和弯曲强度结合时，确定更容易获得的井水的效果。使用四种不同的RCA制备混合物，替换0％，25％，50％和100％天然粗骨料（NCA）。共有八种混合物，由饮用水（PW）固化的四种混合物，并通过井水固化的其他四种混合物。结果表明，当使用NCA制造的混凝土时，抗压强度降低约16.0％。对于含有25％，50％和100％RCA的混凝土，还使用WW造成约13.2％，10.0％和8.5％。当使用井水时，弯曲和分裂拉伸强度也降低。回归分析允许制定用于高强度混凝土的新材料本构关系，包括WW和RCA的影响。

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