Effect of electric furnace steel slag powder on the strength of green low-carbon concrete with high-titanium blast furnace slag

IF 7.2 2区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY
Yuehua Liang, Jie Wang
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Abstract

This study explores the application of electric furnace steel slag powder (EFSSP), fly ash (FA), and high-titanium heavy slag (HTHS) from Panzhihua City, China, in producing green low-carbon concrete. The properties of these waste materials were characterized, and the fluidity and hydration activity of the EFSSP-FA composite admixture in cement mortar were tested. Additionally, the strength of HTHSC mixed with EFSSP-FA composite admixture was evaluated at various curing times, and the microstructure of the concrete mortar layer was analyzed. The study shows that the 7-day activity indices of EFSSP and FA are 61 % and 51.96 %, respectively, with fluidity ratios of 92.53 % and 124.58 %. Mixing EFSSP and FA compensates for their individual limitations. At a 1:1 mass ratio, the composite admixture achieved a 69.89 % activity index and 114.46 % fluidity. The pozzolanic reaction within the composite admixture was evident, promoting the continuous formation of C-S-H in HTHSC, the compressive strength after curing periods of 520 days, 300 days, 180 days, and 90 days reached approximately 190 %, 170 %, 150 %, and 130 % of the 28-day strength, respectively. The XRD, SEM, TG, and DSC characterization results for the HTHSC mortar layer at different curing stages were consistent with the observed trends in compressive strength. Since the raw materials used for concrete preparation were industrial waste, this portion was excluded from carbon emissions calculations. The all-industrial waste HTHSC achieved approximately a 30 % reduction in carbon emissions, the carbon emissions per unit of strength at 520 days of curing were approximately 55 % of those at 28 days.
电炉钢渣粉对高钛高炉矿渣绿色低碳混凝土强度的影响
本研究探讨了中国攀枝花市电炉钢渣粉(EFSSP)、粉煤灰(FA)和高钛重渣(HTHS)在生产绿色低碳混凝土中的应用。对这些废弃材料的特性进行了表征,并测试了 EFSSP-FA 复合掺合料在水泥砂浆中的流动性和水化活性。此外,还评估了掺有 EFSSP-FA 复合外加剂的 HTHSC 在不同养护时间的强度,并分析了混凝土砂浆层的微观结构。研究表明,EFSSP 和 FA 的 7 天活性指数分别为 61 % 和 51.96 %,流动性比分别为 92.53 % 和 124.58 %。混合使用 EFSSP 和 FA 可以弥补它们各自的局限性。按照 1:1 的质量比,复合外加剂的活性指数为 69.89%,流动性为 114.46%。复合掺合料中的水青石反应明显,促进了 HTHSC 中 C-S-H 的持续形成,固化 520 天、300 天、180 天和 90 天后的抗压强度分别达到 28 天强度的约 190%、170%、150% 和 130%。不同养护阶段 HTHSC 砂浆层的 XRD、SEM、TG 和 DSC 表征结果与观察到的抗压强度趋势一致。由于用于制备混凝土的原材料是工业废料,因此在计算碳排放量时不包括这一部分。全工业废料 HTHSC 的碳排放量减少了约 30%,养护 520 天时单位强度的碳排放量约为养护 28 天时的 55%。
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来源期刊
Journal of CO2 Utilization
Journal of CO2 Utilization CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.90
自引率
10.40%
发文量
406
审稿时长
2.8 months
期刊介绍: The Journal of CO2 Utilization offers a single, multi-disciplinary, scholarly platform for the exchange of novel research in the field of CO2 re-use for scientists and engineers in chemicals, fuels and materials. The emphasis is on the dissemination of leading-edge research from basic science to the development of new processes, technologies and applications. The Journal of CO2 Utilization publishes original peer-reviewed research papers, reviews, and short communications, including experimental and theoretical work, and analytical models and simulations.
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