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: The good retention of zinc by the cement matrix was mainly attributed to the precipitation of a hydrated and well crystallized phase with platelet morphology at early age, and to chemisorption onto aluminum hydroxide at later age.
29 citations
TL;DR: In this paper, the authors explore a new approach to produce sulfate resistant cements by the addition of BaCO 3 to clinker, capitalising on the capacity of Ba to immobilise sulfates in the form of highly insoluble barite (BaSO 4 ).
29 citations
TL;DR: In this article, a simplified model is presented for prediction of the consequences of sulphate intrusion into different concretes, which can be used for simplified performance assessment studies on the longevity of concrete barriers and is not primarily intended as a detailed mechanistic research model.
29 citations
TL;DR: Lehmann et al. as discussed by the authors found that the acicular crystals lining the cavities of metamorphosed limestone-inclusions in leucite-nepheline-tephrite from the Ettringer-Bellerberg, near the village of ettringen (between Mayen and the Laacher See), Rhineland.
Abstract: Ettringite was the name given by J. Lehmann in 1874 to minute, transparent, acicular crystals lining the cavities of metamorphosed limestone-inclusions in leucite-nepheline-tephrite from the Ettringer-Bellerberg, near the village of Ettringen (between Mayen and the Laacher See), Rhineland. Lehmann detached sufficient needles from the limestone for chemical analysis, and found that they were not gypsum, as formerly supposed, but a hydrated calcium sulphoaluminate.
29 citations
Patent•
09 Dec 1987
TL;DR: In this article, a process for the formation of hydraulic binders and building elements comprising from 70% ettringite and up to 30% calcium silicate hydrates is disclosed.
Abstract: HYDRAULIC BINDERS AND BUILDING ELEMENTS FORMED OF NON-TRADITIONAL MATERIALS A process is disclosed for the formation of hydraulic binders and building elements comprising from 70% ettringite and up to 30% calcium silicate hydrates. Ettringite is a very strong mineral and the product may be at least the equal in terms of mechanical properties of Portland cement while not suffering shrinkage and expansion problems. The process comprises mixing powdered source materials of reactive CaSO4, CaO and Al2O3 with or without SiO3 with or without SiO2 and hydrating the intimate mixture at a ratio in the range of 1 part powdered source materials to 0.35-1 part water. Most conveniently, impure source material such as industrial by-products are used as they have been found to catalyse the hydration reaction. Further if gypsum is a powdered source material, in a natural, pure or chemical form, it is preferably calcined since such material sets quickly and gives early mechanical strength. A clinker of calcium sulphoaluminate may be produced for use as a powdered source material.
29 citations