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Influence of supplementary cementitious materials on strength and durability characteristics of concrete

机译：辅助胶凝材料对混凝土强度和耐久性能的影响

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摘要

The present study is focused on the mechanical and durability properties of ternary blended cement concrete mix of different grades 30 MPa, 50 MPa and 70 MPa. Three mineral admixtures (fly ash, silica fume and lime sludge) were used as a partial replacement of cement in the preparation of blended concrete mix. The durability of ternary blended cement concrete mix was studied by exposing it to acids HCl and H2SO4 at 5% concentration. Acid mass loss factors (AMLF), acid strength loss factor (ASLF) and acid durability factor (ADF) were determined, and the results were compared with the control mix. Chloride ions penetration was investigated by conducting rapid chlorination penetration test and accelerated corrosion penetration test on control mix and ternary blended cement concrete. From the results, it was evident that the usage of these mineral admixtures is having a beneficiary role on the strength as well as durability properties. The results inferred that the utilization of these materials as a partial replacement of cement have significantly enhanced the compressive strength of blended concrete mix in 30 MPa, 50 MPa and 70 MPa by 42.95%, 32.48% and 22.79%. The blended concrete mix shown greater resistance to acid attack compared to control mix concrete. Chloride ion ingress of the blended cement concrete mix was low compared to control mix implying the beneficiary role of mineral admixtures.
机译：本研究的重点是不同等级30 MPa，50 MPa和70 MPa的三元掺混水泥混凝土混合物的机械和耐久性能。三种矿物掺合料（粉煤灰，硅粉和石灰泥）被用作水泥在配制混凝土混合物中的部分替代品。通过将三元掺混水泥混凝土混合物暴露于5％浓度的酸HCl和H2SO4中来研究其耐久性。测定酸质量损失因子（AMLF），酸强度损失因子（ASLF）和酸耐久性因子（ADF），并将结果与​​对照混合物进行比较。通过对对照混合物和三元掺合水泥混凝土进行快速氯化渗透试验和加速腐蚀渗透试验，研究了氯离子的渗透情况。从结果可以看出，这些矿物掺合料的使用对强度和耐久性能具有有益的作用。结果表明，这些材料作为水泥的部分替代品，显着提高了30 MPa，50 MPa和70 MPa混合混凝土拌合料的抗压强度，分别为42.95％，32.48％和22.79％。与对照混凝土相比，混合混凝土具有更强的抗酸侵蚀能力。与对照混合料相比，混合水泥混凝土混合料的氯离子侵入量低，这暗示了矿物混合料的有益作用。

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