当前位置: X-MOL 学术Cem. Concr. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of curing regimes on composition and microstructure of blended pastes: Insight into later-age hydration mechanism
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2025-01-09 , DOI: 10.1016/j.cemconres.2025.107785
Liming Huang, Luping Tang, Zhijun Dong, Birhan Alkadir Abdulahi, Zhenghong Yang

Understanding the hydration of composite binders is essential for decarbonizing the cement industry. This study investigated the microstructure and composition of pastes with either fly ash or slag after different long-term curing. Results show that the elevated temperature slightly reduces the capillary pore volume and internal RH of sealed samples. Water curing largely enhances hydration of fly ash and slag after the first week, forming later-age products in surface zone with stabilized Mc and Hc. This increases both gel and capillary pore volumes. C-A-S-H in water-cured pastes has a longer mean chain length and extremely lower alkali uptake than that in sealed curing. Modelling results indicate that nucleation ceases in sealed pastes once thermodynamic limitations are reached due to self-desiccation. Even with adequate water, late-stage hydration remains kinetically constrained due to the slow nucleation and growth rate near the unhydrated surface, with diffusion likely being one of rate-controlling factors.

中文翻译:


固化机制对混合浆料成分和微观结构的影响:深入了解后期水合机制



了解复合粘合剂的水化对于水泥行业的脱碳至关重要。本研究考察了不同长期固化后粉煤灰或炉渣浆料的微观结构和组成。结果表明,升高的温度会略微降低密封样品的毛细管孔体积和内部 RH。第一周后,水固化在很大程度上增强了粉煤灰和炉渣的水化,在表面区域形成具有稳定 Mc 和 Hc 的晚龄产品。这会增加凝胶和毛细管孔的体积。与密封固化相比,水固化浆料中的 C-A-S-H 具有更长的平均链长和极低的碱吸收率。建模结果表明,一旦由于自干燥而达到热力学限制,密封浆料中的成核就会停止。即使有足够的水,由于未水合表面附近的成核和生长速度缓慢,后期水合仍然受到动力学限制,扩散可能是速率控制因素之一。
更新日期:2025-01-09
down
wechat
bug