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Influence of rice husk-bark ash on mechanical properties of concrete containing high amount of recycled aggregates

机译：稻壳树皮灰对含大量再生骨料的混凝土力学性能的影响

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In this study, ground rice husk-bark ash (RHBA) was used as a pozzolanic material in concrete containing high amount of recycled aggregates. The concretes were prepared by using 100% of recycled coarse aggregate (RCA), then river sand was replaced by recycled fine aggregate (RFA) at 0%, 50%, and 100% by weight of the fine aggregate (river sand plus recycled fine aggregate). The results revealed that recycled aggregate concretes had lower compressive strength than that of the conventional concrete (concrete made from normal aggregates). In addition, the use of ground RHBA in recycled aggregate concrete gave higher compressive strength than the recycled aggregate concrete without ground RHBA even though it increased the slump loss of concrete. The splitting tensile strength of the recycled aggregate concrete was 8.15% of the compressive strength. Finally, the modulus of elasticity of recycled aggregate concrete was lower than that of the conventional concrete and was about 4% lower than the value predicted by ACI 318.
机译：在这项研究中，碾碎的稻壳树皮灰（RHBA）被用作含有大量可再生集料的混凝土中的火山灰材料。通过使用100％的再生粗骨料（RCA）制备混凝土，然后以细骨料的0％，50％和100％（河砂加再生细料）的重量分别用再生细骨料（RFA）代替河砂。骨料）。结果表明，再生骨料混凝土的抗压强度比常规混凝土（由普通骨料制成的混凝土）低。此外，在再生集料混凝土中使用磨碎的RHBA比未磨碎的RHBA的再生集料混凝土具有更高的抗压强度，尽管它增加了混凝土的坍落度损失。再生骨料混凝土的劈裂抗拉强度为抗压强度的8.15％。最后，再生骨料混凝土的弹性模量比常规混凝土低，比ACI 318预测的值低约4％。

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