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.
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TL;DR: In this article, the authors investigated the evolution of a binder gel in carbonation-cured Portland cement in an acidic medium and found that the carbonation products of belite were more stable than those of alite, with less gypsum formation under H2SO4 or HCl.
44 citations
TL;DR: In this article, a mathematical model for the kinetics of hydration of tricalcium aluminate in the presence of gypsum was developed, and the model was solved, illustrated and compared to experimental heat release data.
44 citations
TL;DR: In this paper, the effect of phosphogypsum (PG) in alkali-activated ground granulated blast furnace slag (GGBFS) was investigated, as a function of alkali activator.
44 citations
TL;DR: The influence of some non-ionic organic additives, dissolved in the water used for mixing cement pastes, on cement hydration was determined by isothermal calorimetry as discussed by the authors.
Abstract: The influence of some non-ionic organic additives, dissolved in the water used for mixing cement pastes, on cement hydration was determined by isothermal calorimetry. The additives, all poly-alcohols, exert a retarding action on cement hydration. Glycerol has, in addition, a particular influence on the crystallisation of ettringite and calcium hydroalumino-monosulphate, accelerating the consumption of sulphate ions.
44 citations
TL;DR: In this article, the effect of up to 4 % calcium sulfate contamination on the soil properties of a natural clay with low liquid limit (CL) soil with and without polymer treatment was investigated and compared to 6 % lime treated soil.
Abstract: In this study, the effect of up to 4 % calcium sulfate contamination on the soil properties of a natural clay with low liquid limit (CL) soil with and without polymer treatment was investigated and compared to 6 % lime treated soil. X-ray diffraction (XRD) and thermogravimetric analysis (TGA) methods were used to identify and quantify the changes in the contaminated CL clay soil. XRD analyses showed the major constituents of the soil were calcium silicate (CaSiO3), aluminum silicate (Al2SiO5), magnesium silicate (MgSiO3), and quartz (SiO2). With 4 % calcium sulfate contamination, the liquid limit (LL) and plasticity index (PI) of the CL soil increased by 30 and 45 %, respectively. The addition of calcium sulfate resulted in the formation of calcium silicate sulfate (Ternesite Ca5(SiO4)2SO4) and aluminum silicate sulfate (Al5(SiO4)2SO4). TGA analyses showed a notable reduction in the weight of calcium sulfate contaminated soil between 600 and 800°C, possibly due to changes in soil mineralogy. In addition, the total weight loss at 800°C for 1.5 % polymer treated soil was about 40 % less than the 4 % calcium sulfate contaminated soil, and it was similar to the weight loss observed in the uncontaminated CL soil. The maximum dry density of compacted soil decreased and the optimum moisture content increased with 4 % of calcium sulfate. The addition of 4 % calcium sulfate increased the free swelling of compacted soil by 67 %. The addition of 6 % lime resulted in the formation of ettringite (Ca6Al2 (SO4)3(OH)12·26H2O). Polymer treatment decreased the LL, PI, swelling index, and optimum moisture content of the soil and increased the compacted maximum dry density. Behavior of sulfate contaminated CL soil with and without treatment was quantified using a unique model that represented both linear and nonlinear responses. Also the model predictions were compared with published data in the literature.
44 citations