Dissolution and initial hydration behavior of tricalcium aluminate in low activity sulfate solutions

IF 10.9 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2020-04-01 DOI:10.1016/j.cemconres.2020.105989
Alexander S. Brand , Steven B. Feldman , Paul E. Stutzman , Anton V. Ievlev , Matthias Lorenz , Darren C. Pagan , Sriramya Nair , Justin M. Gorham , Jeffrey W. Bullard
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引用次数: 29

Abstract

Influences of alkali or alkaline earth sulfates on the hydration of cubic tricalcium aluminate (C3A) were evaluated by in situ dissolution rate measurements, by ex situ near-surface composition measurements with secondary ion mass spectrometry, and by in situ synchrotron X-ray diffraction to monitor precipitation of hydration products. Both slight reductions in dissolution rate and cation-specific interactions with the solid were observed. The near-surface Ca/Al ratio is significantly lower after some dissolution and the electrolyte cations are incorporated within the surface with different affinities (Mg2+ > K+ > Na+). An interfacial dissolution-reprecipitation mechanism may explain the observations as well as, or better than, a simple cation exchange. The sulfate concentration in solution affects the rates of both C3A dissolution and precipitation of hydration products. Sulfate ions likely adsorb at the hydrous Al-rich surface layer, thereby reducing the dissolution rate of aluminates and delaying the precipitation of aluminate hydration products.

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铝酸三钙在低活性硫酸盐溶液中的溶解和初始水化行为
通过原位溶解速率测量、二次离子质谱法非原位近地表成分测量和原位同步加速器x射线衍射监测水化产物的沉淀来评估碱或碱土硫酸盐对立方铝酸三钙(C3A)水化的影响。观察到溶解速率和阳离子特异性与固体的相互作用均略有降低。溶解后的近表面Ca/Al比明显降低,电解质阳离子以不同的亲和力结合在表面内(Mg2+ >K +比;Na +)。界面溶解-再沉淀机制可能比简单的阳离子交换机制更好地解释这些观察结果。溶液中硫酸盐浓度对C3A的溶解速率和水化产物的沉淀速率均有影响。硫酸盐离子可能吸附在富铝水合面层,从而降低铝酸盐的溶解速率,延缓铝酸盐水化产物的析出。
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来源期刊
Cement and Concrete Research
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.
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