Effect of nitrate anions on sulfate balance and hydration kinetics in C3S/C3A systems

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-08-09 DOI:10.1016/j.cemconres.2025.108008

Lei Lu, Xiao Liu, Jian Wang, Simai Wang, Yuhan Yao, Yurui Xu, Minghui Jiang, Yanzhen Xiao, Yanxi Li, Ziming Wang, Suping Cui

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Abstract

Elucidating the impact of nitrate anions on sulfate balance mechanism of cement is essential for optimizing the hydration performance of cementitious systems. This knowledge provides fundamental insights into regulating cementitious systems under varying service conditions. This study investigated how varying SO₃ content and nitrate anions affect sulfate balance in C₃S/C₃A pastes and the impact of these alterations on the hydration process. The influence of nitrate anions from Mg(NO₃)₂ on sulfate balance was determined by calorimetry, ICP-OES, TG, XRD and SEM. It was found that nitrate anions counteract Mg²⁺ inhibition of C₃S and C₃A hydration by enhancing mineral dissolution, liberating Ca²⁺ into pore solutions to accelerate hydration. Accelerating the formation process of ettringite (AFt) increased demand for sulfate. This Ca²⁺ enrichment promotes portlandite supersaturation, which shortens the hydration induction period and accelerates C-S-H growth. The sulfate content significantly influences C-S-H growth kinetics at fixed nitrate concentrations.

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硝酸盐阴离子对C3S/C3A体系中硫酸盐平衡及水化动力学的影响

阐明硝酸盐阴离子对水泥硫酸盐平衡机制的影响，对优化水泥体系水化性能具有重要意义。这些知识为在不同的使用条件下调节胶凝体系提供了基本的见解。研究了不同的SO₃含量和硝酸盐阴离子对C3S/C3A膏体中硫酸盐平衡的影响，以及这些变化对水化过程的影响。采用量热法、ICP-OES、TG、XRD和SEM测定了Mg（NO₃）2中硝酸盐阴离子对硫酸盐平衡的影响。发现硝酸盐阴离子通过促进矿物溶解，将Ca2+释放到孔隙溶液中，加速水化，从而抵消Mg2+对C3S和C3A水化的抑制作用。钙矾石（AFt）形成过程的加速增加了对硫酸盐的需求。Ca2+的富集促进了波特兰铁矿的过饱和，缩短了水化诱导期，加速了C-S-H的生长。在固定硝酸盐浓度下，硫酸盐含量显著影响C-S-H生长动力学。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.