Mohamed Osama A
College of Engineering, Abu Dhabi University, Abu Dhabi P.O. Box 59911, United Arab Emirates.
Polymers (Basel). 2023 Feb 28;15(5):1248. doi: 10.3390/polym15051248.
Reductions of green gas emissions and the reuse/recycling of industrial byproducts are important for the mitigation of the environmental impact of the construction industry. The replacement of ordinary Portland cement (OPC) is a concrete binder with industrial byproducts that possess sufficient cementitious and pozzolanic properties, such as ground granulated blast furnace slag (GBS) and fly ash. This critical review analyzes the effect of some of the most critical parameters on the development of the compressive strength of concrete or mortar that consists of combinations of alkali-activated GBS and fly ash as binders. The review includes the effects of the curing environment, the proportions of GBS and fly ash in the binder, and the concentration of the alkaline activator on strength development. The article also reviews the effect of exposure as well as the age of samples at the time of exposure to acidic media on the development of concrete strength. The effect of acidic media on mechanical properties was found to depend not only on the type of acid but also on the alkaline activator solution, proportions of GBS and fly ash in the binder, and the age of the sample at the time of exposure, among other factors. As a focused review, the article pinpoints important findings such as the change in compressive strength over time when mortar/concrete is cured in an environment that permits the loss of moisture versus curing in a system that retains the alkaline solution and keeps reactants available for hydration and the development of geopolymerization products. The relative contents of slag and fly ash in blended activators have a significant impact on strength development. Research methods used include a critical review of the literature, a comparison of reported research findings, and identifying reasons for agreement or disagreement of findings.
减少温室气体排放以及工业副产品的再利用/回收对于减轻建筑业对环境的影响至关重要。用具有足够胶凝性和火山灰特性的工业副产品替代普通硅酸盐水泥（OPC）作为混凝土胶凝材料，如粒化高炉矿渣（GBS）和粉煤灰。本综述分析了一些最关键参数对以碱激发GBS和粉煤灰组合作为胶凝材料的混凝土或砂浆抗压强度发展的影响。综述内容包括养护环境、胶凝材料中GBS和粉煤灰的比例以及碱性激发剂浓度对强度发展的影响。文章还综述了暴露的影响以及样品在暴露于酸性介质时的龄期对混凝土强度发展的影响。发现酸性介质对力学性能的影响不仅取决于酸的类型，还取决于碱性激发剂溶液、胶凝材料中GBS和粉煤灰的比例以及暴露时样品的龄期等其他因素。作为一篇重点综述，文章指出了一些重要发现，例如当砂浆/混凝土在允许水分损失的环境中养护与在保留碱性溶液并使反应物可用于水化和地质聚合产物形成的系统中养护时，抗压强度随时间的变化。混合激发剂中矿渣和粉煤灰的相对含量对强度发展有显著影响。所采用的研究方法包括对文献的重点综述、对已报道研究结果的比较以及确定结果一致或不一致的原因。
