Abstract
Effect of calcium sulfate variety on the microstructure and properties of cement-based grouting materials made by sulfoaluminate cement clinker, calcium sulfate resource, and quicklime was investigated in this paper. Isothermal calorimetric, XRD, DTA-TG, and SEM-EDS were used to characterize the reaction process of cement-based grouting materials. The mechanical property and expansion of the harden body were also tested. The results showed that (1) the formation of ettringite can be completed during the first 2 h when gypsum was selected, causing nonexpansion of the harden body, and ettringite tends to be precipitated near the clinker grain, which has a negative influence on the “skeleton effect” of ettringite, resulting in lower strength of the hardened body. (2) Ettringite can be continually and slowly precipitated when an anhydride was chosen, and the hardened body shows significant expansion characteristic. Besides, ettringite in anhydride paste tends to be precipitated in the form of complex interleaving, which can generate a positive influence on mechanical property of the hardened paste.
Highlights
Sulfoaluminate cement has significant advantages compared with Portland cement, such as lower sintering temperature of the clinker, less limestone consumption, and lower carbon dioxide emissions [1,2,3,4,5]. erefore, the sulfoaluminate cement can be regarded as a kind of low-carbon environmentfriendly cementitious materials. e sulfoaluminate cement clinker is mainly composed of C4A3S and C2S
This paper mainly studies the effect of calcium sulfate variety on the hydration of the sulfoaluminate cement clinker-calcium sulfate-quicklime ternary material system
For CSA-A, only a small amount of ettringite is formed at the early hydration process, the precipitated ettringite can be uniformly distributed in CSAA, showing complex overlapping between each other and ensuring good “skeleton effect” of ettringite, which may have a positive effect on the compressive strength of the hardened body
Summary
Sulfoaluminate cement has significant advantages compared with Portland cement, such as lower sintering temperature of the clinker, less limestone consumption, and lower carbon dioxide emissions [1,2,3,4,5]. erefore, the sulfoaluminate cement can be regarded as a kind of low-carbon environmentfriendly cementitious materials. e sulfoaluminate cement clinker is mainly composed of C4A3S (ye’elimite) and C2S (belite). According to the basic hydration characteristic of ye’elimite, the authors have used the sulfoaluminate cement clinker, natural anhydride, and quicklime to prepare a novel grouting material in previous studies, which had a significant rapid hardening, early strength, and microexpansion characteristics compared with Portland cement-based grouting material [23]. E authors’ previous work proved that the amount of calcium sulfate could affect the hydration process of ye’elimite and strongly influence the macroscopic properties of the sulfoaluminate cement clinker-natural anhydride-quicklime ternary system [23]. The relevant research about the effect of calcium sulfate variety on the hydration of the C4A3S-CaSO4-CaO ternary material system is quite limited Based on this situation, this paper mainly studies the effect of calcium sulfate variety on the hydration of the sulfoaluminate cement clinker-calcium sulfate-quicklime ternary material system. Erefore, gypsum and anhydride are chosen. rough the research work of this paper, the influence mechanism of a calcium sulfate variety on the hydration of the ultrafine sulfoaluminate cement clinker-calcium sulfate-quicklime ternary grouting material system will be revealed, and it can provide some theoretical direction for the selection of calcium sulfate resource on the sulfoaluminate cement clinker-calcium sulfate-quicklime ternary grouting material system
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