Investigation of mechanical properties and hydration of low-carbon magnesium and calcium-rich waste powder geopolymer paste

IF 7.2 2区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of CO2 Utilization Pub Date : 2024-11-25 DOI:10.1016/j.jcou.2024.102984

Changming Li , Xudong Yang , Dongyang Jia , Shunbo Zhao , Guanfeng Liu , Yaozong Wang , Wanjiao Li , Wenyu Song

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引用次数: 0

Abstract

Magnesium and calcium-rich waste powder (MWP) has the potential to be a low-carbon geopolymer cementitious material. This study investigates the mechanical properties and hydration products of low-carbon magnesium and calcium-rich waste powder geopolymer paste (LMWP). The influences of alkali content, calcination temperature, mix proportions of raw materials and curing temperature on the compressive strength and hydration of LMWP were examined. The mechanical properties of LMWP were systematically evaluated by assessing setting time, fluidity, and compressive strength, while the pore structure was analyzed using mercury intrusion porosimetry (MIP). The hydration products and microstructures of LMWP were investigated by XRD, TG-DTG, and SEM-EDS. The results indicated that incorporating 1 % NaOH significantly enhanced the compressive strength of LMWP, whereas thermally activated MWP (800 ℃, 900 ℃) negatively affected compressive strength development. The addition of slag facilitated the reaction of MWP and improved the compressive strength of LMWP. When the slag incorporation reached 40 %, the specimen demonstrated optimal performance with a compressive strength of 27.8 MPa. The pore diameter was predominantly distributed around 10 nm, indicating well-structured porosity. Microstructural analysis revealed that the hydration products are dense calcium magnesium silicate gels (C-M-S-H), which significantly enhanced the compressive strength and optimized pore structure of LMWP. The efficiency of carbon emission reduction achieved by LMWP was evaluated. The findings indicate that, compared to traditional cement-based materials, LMWP reduces cement consumption by over 60 %, significantly decreasing CO₂ emissions. This study innovatively utilizes MWP to prepare green and low-carbon geopolymer paste materials, with the aim of replacing cement applications in the construction industry, thereby reducing carbon emissions. It explores new avenues for the low-carbon and green development of the civil engineering sector and contributes to efforts in addressing the global climate crisis.

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低碳富镁、富钙废粉土工聚合物浆料的力学性能和水化研究

富镁和富钙废粉（MWP）具有成为低碳土工聚合物胶凝材料的潜力。本研究探讨了低碳富镁、富钙废粉土工聚合物浆料（LMWP）的力学性能和水化产物。研究了碱含量、煅烧温度、原材料混合比例和固化温度对 LMWP 抗压强度和水化产物的影响。通过评估凝结时间、流动性和抗压强度，对 LMWP 的机械性能进行了系统评价，同时使用汞侵入孔隙模拟法（MIP）分析了孔隙结构。通过 XRD、TG-DTG 和 SEM-EDS 研究了 LMWP 的水化产物和微观结构。结果表明，加入 1 % 的 NaOH 能显著提高 LMWP 的抗压强度，而热活化 MWP（800 ℃、900 ℃）会对抗压强度的发展产生负面影响。炉渣的加入促进了 MWP 的反应，提高了 LMWP 的抗压强度。当矿渣掺量达到 40% 时，试样表现出最佳性能，抗压强度达到 27.8 兆帕。孔隙直径主要分布在 10 nm 左右，表明孔隙结构良好。微观结构分析表明，水化产物是致密的硅酸钙镁凝胶（C-M-S-H），它显著提高了 LMWP 的抗压强度，优化了孔隙结构。对 LMWP 实现的碳减排效率进行了评估。研究结果表明，与传统的水泥基材料相比，LMWP 可减少 60% 以上的水泥用量，大大减少了二氧化碳排放量。本研究创新性地利用 MWP 制备绿色低碳的土工聚合物浆料材料，旨在取代水泥在建筑行业的应用，从而减少碳排放。它为土木工程领域的低碳和绿色发展探索了新途径，并为应对全球气候危机做出了贡献。

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来源期刊

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.