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, a new method of ettringite crystal growth by combining calcium hydroxide and aluminum sulfate solutions was devised to reliably produce crystals that could be seen with a light microscope.
150 citations
TL;DR: In this paper, the influence of styrene-butadiene rubber (SBR) latex on cement hydrates Ca(OH)2, ettringite, C4AH13 and C-S-H gel and the degree of cement hydration is studied by means of several measure methods.
149 citations
TL;DR: In this article, the early age hydration mechanisms of accelerated CEM I pastes were evaluated using liquid phase analysis, conductimetry, isothermal calorimetry and in situ XRD and SEM.
148 citations
TL;DR: In this paper, the authors report a full study of the hydration of calcium sulfoaluminate eco-cements with different sulfate sources (gypsum, bassanite and anhydrite) and two water/cement ratios (0.50 and 0.65).
Abstract: The availability of cements, including eco-cements, with tailored mechanical properties is very important for special applications in the building industry. Here we report a full study of the hydration of calcium sulfoaluminate eco-cements with different sulfate sources (gypsum, bassanite and anhydrite) and two water/cement ratios (0.50 and 0.65). These parameters have been chosen because they are known to strongly modify the mechanical properties of the resulting mortars and concretes. The applied multi-technique characterization includes: phase assemblage by Rietveld method, evolved heat, conductivity, rheology, compressive strength and expansion/retraction measurements. The dissolution rate of the sulfate sources is key to control the hydration reactions. Bassanite dissolves very fast and hence the initial setting time of the pastes and mortars is too short (20 min) to produce homogeneous samples. Anhydrite dissolves slowly so, at 1 hydration-day, the amount of ettringite formed (20 wt%) is lower than that in gypsum pastes (26 wt%) (w/c = 0.50), producing mortars with lower compressive strengths. After 3 hydration-days, anhydrite pastes showed slightly larger ettringite contents and hence, mortars with slightly higher compressive strengths. Ettringite content is the chief parameter to explain the strength development in these eco-cements.
146 citations
TL;DR: In this article, the formation of thaumasite was investigated with the progressive equilibrium approach (PEA) experimentally simulating the conditions of various levels of sulfate addition in hardened cement pastes.
145 citations