【摘 要】
：
In this paper, the hydration process of Portland cement with NaCl and KCl addition was studied by isothermal calorimeter, ultrasonic method and compressive strength.Pastes were designed containing 5%,
【机 构】
：
Civil Engeenering Program-PEC, Universidade Federal do Rio de Janeiro-COPPE/UFRJ, Rio de Janeiro,RJ,
【出 处】
：
The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
In this paper, the hydration process of Portland cement with NaCl and KCl addition was studied by isothermal calorimeter, ultrasonic method and compressive strength.Pastes were designed containing 5%, 10%, 15%, 20% and 36% NaCl by the weight of water (BWOW), and 5%, 10%, 15%, 20% and 34% KCl (BWOW) and water to cement ratio of 0.44.The results of these tests were correlated with the amount of the formed hydration products obtained by thermogravimetfic analysis and the compressive strength.The addition of NaCl up to 15% accelerated the hydration reactions at the first ages.On the other hand, 20 and 36% of NaCl addition delayed the hydration reactions.At older ages, all pastes with NaCl addition had their reactions delayed;it directly influenced the amount of formed products and the compressive strength.The KCl addition accelerated the hydration reactions at the first ages, with exception of paste containing 34% KCl.The addition of KCl have not significantly influenced the amount of the formed products and mechanical properties at long periods.
其他文献
Crystalline cement hydrates such as Alumina Ferrite-mono and-triphases (AFm and AFt) show different hydration states depending on the exposure temperature and relative humidity.Varying hydration state
Despite many studies were carried out to understand the mechanisms controlling the kinetics of cement hydration, it is not completely well-understood and discussions are still open and controversial.T
Cement manufacture generates environmental problems due, among others, to the greenhouse gases, especially CO2, emitted in the process.A number of materials have been used as cement additions in recen
Cement slurry is commonly used with different additives in the oil well construction to fulfill many functions such as protecting steel casing from corrosion, restricting fluid movements between forma
Graphene is a mono-layer of covalently bonded carbon atoms arranged in a hexagonal lattice.Graphenes extremely high tensile strength has recently attracted great interest in cement research as a poten
To reduce the environmental impact of cement industries, cementitious materials are added to the manufacture of eco-efficient cements, focusing in industrial wastes.In this paper metakaolinite (MK) ba
There is an increasing decline in the availability of traditional pozzolans due not only to their reduced exploitation and limitations on quarrying, but also to the downward trend in the establishment
In order to understand the important role of SAP entraining water in the development of properties of high performance cement-based material, the effect of SAP entraining water on its rheological prop
Cement-asphalt mortar (CA mortar) is composed of Portland cement, asphalt emulsion,water and other admixtures,which combines both advantages of the mechanical property of cement and flexibility of asp
Although the C3A content in clinker is relatively low, its behavior is crucial because it controls the setting time of cement.The presence of minor elements, mainly alkalis (including Na+ and K+) duri