The effects of curing conditions on the performance and carbon dioxide emissions of fly ash-magnesium phosphate cement repair materials for pavement maintenance

作者：Ying Su, Yu Qian, Ming Sun, Changchun Li, Chunmei Liu, Dan Zhang, Xiaodong Zhang, Jun Yang, Yan Zhao, Rui Tao, Fengxia Xu · 发表于：Journal of CO2 Utilization · 年份：2024 · DOI：10.1016/j.jcou.2024.102998 · 被引用次数：11 · 研究领域：Magnesium Oxide Properties and Applications、Microwave Dielectric Ceramics Synthesis、Concrete and Cement Materials Research

Magnesium phosphate cement (MPC) is a new type of repair material that is fast-setting, resistant to acids and alkalis, and environmentally friendly. Compared to commonly used repair materials and protective coatings, such as sulphoaluminate cement, epoxy resin, and zinc phosphate, MPC significantly reduces carbon dioxide emissions throughout its entire lifecycle (from raw material extraction to application, service, and waste disposal). Additionally, its advantages of fast curing, early strength, and excellent adhesion make it suitable for rapid repair of damaged roads and bridges. Furthermore, incorporating industrial by-products such as fly ash (FA) into MPC results in a cement that combines the advantageous properties of FA, offering excellent workability and durability. The substitution of FA for raw materials in MPC reduces the reliance on dead-burned MgO, contributing to a further reduction in CO 2 emissions and lessening the impact on the natural environment. Studies have shown that MPC exhibits a decrease in strength under high humidity and water-curing conditions, and the addition of FA can help improve this phenomenon. However, the research lacks investigations on the effect of FA on the performance of MPC under different curing methods, with the same mix ratios and experimental conditions. This paper investigates the effects of FA content on MPC under standard curing conditions by measuring setting time, fluidity, and mechanical properties, as well as conducting m...