Choi Se-Jin, Bae Sung-Ho, Lee Jae-In, Kim Ji-Hwan
Department of Architectural Engineering, Wonkwang University, 460 Iksan-daero, Iksan 54538, Korea.
Materials (Basel). 2021 Apr 23;14(9):2156. doi: 10.3390/ma14092156.
Recently, interest in sustainable development has been increased. In this regard, efforts have been made to prevent environmental pollution, and research on the recycling of construction industry byproducts has been actively conducted in the construction industry. In South Korea, about 20 million tons of waste wash water from the ready-mixed concrete production process are generated, and some of them are recycled using recycling facilities in a ready-mixed concrete plant, but a significant portion of them is discharged or landfilled without permission, causing environmental problems. To increase the recycling rate of steel slag and reduce environmental pollution in the construction industry, we simultaneously applied blast furnace slag fine aggregate (BSFA) and recycled water (RW) to cement mortar. In this study, to examine the feasibility of RW and BSFA, we evaluated the fluidity, compressive strength, tensile strength, drying shrinkage, carbonation depth, and chloride penetration resistance of cement mortar using RW and BSFA. From the test results, the 28-day compressive strengths of all samples using RW and BSFA were higher than that of the control sample. In the case of samples using RW, as the BSFA replacement ratio was increased, the carbonation depth of the samples decreased. Therefore, when RW and BSFA are used properly, the mechanical properties of cement mortar, carbonation resistance, and chloride ion penetration resistance are expected to be effectively improved.
最近，对可持续发展的关注度有所提高。在这方面，人们已努力防止环境污染，并且建筑行业也在积极开展有关建筑工业副产品回收利用的研究。在韩国，预拌混凝土生产过程中会产生约2000万吨废洗涤水，其中一些通过预拌混凝土厂的回收设施进行回收利用，但仍有很大一部分未经许可就被排放或填埋，从而引发环境问题。为提高钢渣的回收率并减少建筑行业的环境污染，我们将高炉矿渣细集料（BSFA）和再生水（RW）同时应用于水泥砂浆中。在本研究中，为检验再生水和高炉矿渣细集料的可行性，我们使用再生水和高炉矿渣细集料对水泥砂浆的流动性、抗压强度、抗拉强度、干燥收缩、碳化深度和抗氯离子渗透性进行了评估。从试验结果来看，所有使用再生水和高炉矿渣细集料的样品的28天抗压强度均高于对照样品。在使用再生水的样品中，随着高炉矿渣细集料替代率的增加，样品的碳化深度降低。因此，若能正确使用再生水和高炉矿渣细集料，预计水泥砂浆的力学性能、抗碳化性和抗氯离子渗透性将得到有效改善。
