Abstract

This manuscript explores the effect of ternary blend i.e. the replacements of cement, fine aggregate and coarse aggregate simultaneously with ground granulated blast furnace slag (GGBFS) and lime, granulated blast furnace slag (GBFS) and recycled coarse aggregate (RCA), respectively, on the fresh, mechanical and durability properties of concrete. Twenty-one concrete mixes having various combinations of GGBFS, lime, GBFS and RCA are prepared and characterized. Results conclude that the concrete mixes containing high volumes of RCA (up to 75%) and GBFS (up to 50%) with 60% GGBFS and 6% hydrated lime, achieve the compressive strength closer to that specified for M25 grade concrete and more than that specified for M20 grade concrete as per IS:10262 (2009). The splitting tensile, flexural and bond strengths show satisfactory performances. Durability results show that these mixes have comparable or better sulphuric acid resistance and chloride ion ingress. Also, these mixes have good cost benefit and very less environmental impact as compared to the normal concrete. Moreover, these concrete mixes save cement up to 66%, fine aggregate up to 50% and coarse aggregate up to 75% and lessen the waste disposal crisis to a greater extent which make these mixes as sustainable concrete mixes.

摘要

本手稿探讨了三元混合物的影响，即分别用磨碎的高炉矿渣 (GGBFS) 和石灰、高炉矿渣 (GBFS) 和再生粗集料 (RCA) 替代水泥、细集料和粗集料，混凝土的新鲜、力学和耐久性能。制备并表征了具有各种 GGBFS、石灰、GBFS 和 RCA 组合的 21 种混凝土混合物。结果得出结论，含有大量 RCA（高达 75%）和 GBFS（高达 50%）、60% GGBFS 和 6% 熟石灰的混凝土混合物，其抗压强度接近于 M25 级混凝土的规定值，超过根据 IS:10262 (2009) 规定的 M20 级混凝土。劈裂拉伸、弯曲和粘合强度表现出令人满意的性能。耐久性结果表明，这些混合物具有相当或更好的耐硫酸和氯离子侵入性。此外，与普通混凝土相比，这些混合物具有良好的成本效益和非常小的环境影响。此外，这些混凝土混合物可节省高达 66% 的水泥、高达 50% 的细骨料和高达 75% 的粗骨料，并在更大程度上减少了废物处理危机，使这些混合物成为可持续的混凝土混合物。