Topic
Ettringite
About: Ettringite is a research topic. Over the lifetime, 2702 publications have been published within this topic receiving 67056 citations. The topic is also known as: woodfordite.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the formation and expansion of ettringite crystals are discussed on the basis of principles of physico-chemistry, and it is suggested that eittringite forms by a through-solution mechanism and that expansive force results from crystallization pressure as well as swelling pressure converted from the reduction of chemical potentials.
156 citations
TL;DR: In this paper, the early C3A-CaSO4 hydration products and the rate of this hydration were investigated by isothermal microcalorimetry, and a monitoring of the ionic concentrations of diluted suspensions.
155 citations
154 citations
TL;DR: In this article, a diffusion equation with a term for a second-order chemical reaction is proposed to determine the sulfate concentration and calcium aluminate profile as a function of time and space.
Abstract: A study is presented to predict the degradation of cement-based materials due to external sulfate attack. Parameters of the model are chosen based on the mix design parameters, degree of hydration, and exposure conditions of concrete. A solution of the diffusion equation with a term for a second-order chemical reaction is proposed to determine the sulfate concentration and calcium aluminate profile as a function of time and space. The crystallization pressure of hydration products such as ettringite can lead to internal stresses. Using the volumetric information, the model predicts the generation of internal stresses, evolution of damage, reduction in stiffness, and thus expansion of a matrix phase. The theoretical expansion-time responses are obtained and compared with a variety of available data in the literature. The most important parameters are the w/c ratio, internal porosity, diffusivity of the cracked and uncracked material, and available calcium aluminates. The importance of controlling the pH of the test solution is clearly observed. Model simulations indicate a reasonable agreement with experimental expansion-time data available in the literature.
154 citations
TL;DR: In this paper, the CaOAl 2 O 3 ǫ 3, CaSO 4 ǔ 2 O system has been investigated at 50°C and 85°C, by calculations of the equilibrium solubility surfaces of AH 3, C 3 AH 6, CH, ettringite, monosulphoaluminate, and gypsum.
153 citations