Journal ArticleDOI
Influence of curing temperatures on the hydration of calcium aluminate cement/Portland cement/calcium sulfate blends
TLDR
In this article, the effects of curing temperature on the hydration of calcium aluminate cement (CAC) dominated ternary binders (studied CAC: Portland cement: calcium sulfate mass ratio were 22.5: 51.7: 25.8) were estimated at 0, 10, 20 and 40°C, respectively.Abstract:
In this paper, the effects of curing temperature on the hydration of calcium aluminate cement (CAC) dominated ternary binders (studied CAC: Portland cement: calcium sulfate mass ratio were 22.5: 51.7: 25.8) were estimated at 0, 10, 20 and 40 °C, respectively. Both α-hemihydrate and natural anhydrite were employed as the main source of sulfate. The impacts of temperature on the phase assemblages, morphology and pore structure of pastes hydrated up to 3 days were determined by using X-ray diffraction (XRD), backscattered electron imaging (BEI) and mercury intrusion porosimetry (MIP). Results reveal that the main hydration products are firmly related to calcium sulphoaluminate based phases. Increasing temperature would result in a faster conversion from ettringite to plate-like monosulfate for both calcium sulfate doped systems. When the temperature increases to 40 °C, an extraordinary formation of stratlingite (C 2 ASH 8 ) and aluminium hydroxide is observed in anhydrite doped pastes. Additionally, increased temperature exerts different effects on the pore structure, i.e. the critical pore diameter shifts to finer one for pastes prepared with α-hemihydrate, but changes to coarser one for those made with anhydrite. From the mechanical point of view, increased temperature accelerates the 1-day strength development prominently, while exerts marginal influence on the development of 3-day strength.read more
Citations
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Journal ArticleDOI
Effect of curing temperature and relative humidity on the hydrates and porosity of calcium sulfoaluminate cement
Lin Li,Ru Wang,Shaokang Zhang +2 more
TL;DR: In this article, the effect of curing temperature and relatively humidity (RH) on the hydrates and porosity of calcium sulfoaluminate (CSA) cement pastes was investigated.
Journal ArticleDOI
Hydration reaction and strength development of calcium sulfoaluminate cement-based mortar cured at cold temperatures
TL;DR: In this article, the authors investigated the hydration reaction and strength development of calcium sulfoaluminate (CSA) cement mortar cured in various cold temperatures (i.e., 5 °C, 0C, −5ÌC and −10Ì°C).
Journal ArticleDOI
Hydration kinetics of cement incorporating different nanoparticles at elevated temperatures
TL;DR: In this paper, the authors used isothermal calorimetry to measure the heat release rate and total heat release of multi-scale cement system incorporated with different nanoparticles at elevated temperatures.
Journal ArticleDOI
Experimental study of calcium sulfoaluminate cement-based self-leveling compound exposed to various temperatures and moisture conditions: Hydration mechanism and mortar properties
TL;DR: In this paper, the phase assemblage and hydration process of CSA cement-based SLC were examined by XRD and DSC-TG analysis, and the morphology and microstructure of hardened mortars were observed by SEM.
Journal ArticleDOI
Study on a high strength ternary blend containing calcium sulfoaluminate cement/calcium aluminate cement/ordinary Portland cement
TL;DR: In this paper, the effects of binder proportion on the mechanical properties of ternary blends were investigated and the hydration products and microstructure of that were observed by XRD, TG, and SEM.
References
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Journal ArticleDOI
Advances in alternative cementitious binders
TL;DR: In this paper, four promising alternative binders available as alternatives to Portland cement are discussed, namely calcium aluminate cement, calcium sulfoaluminate cements, alkali-activated binders, and supersulfated cements.
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Thermodynamic Modelling of the Effect of Temperature on the Hydration and Porosity of Portland Cement
TL;DR: In this article, the phase assemblage and pore solution of Portland cements hydrated between 0-60°C were modeled as a function of time and temperature, and a good correlation between calculated porosity and measured compressive strength was observed.
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Hydration of calcium sulfoaluminate cements — Experimental findings and thermodynamic modelling
TL;DR: In this article, the hydration of two CSA cements has been investigated experimentally and by thermodynamic modelling between 1h and 28 days at w/c ratios of 0.72 and 0.80, respectively.
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Effect of temperature on the pore solution, microstructure and hydration products of Portland cement pastes
TL;DR: In this paper, the effect of temperature on the hydration products and the composition of the pore solution are investigated for two Portland cements from 5 to 50°C, and the results show that at 40 and 50 °C, the formation of denser C-S-H, a more heterogeneous distribution of the hyration products, a coarser porosity, a decrease of the amount of ettringite as well as the formation and formation of very short etteringite needles has been observed.
Journal ArticleDOI
Effect of temperature on the hydration of the main clinker phases in portland cements: part ii, blended cements
TL;DR: In this article, the hydration of two Mexican Portland cements at five temperatures in the range from 10 to 60°C was investigated, and the results showed that increased temperature initially accelerated hydration for the four major anhydrous phases present in both cements.