Publication
Effect of alkali, aluminium and equilibration time on calcium-silicate-hydrates
Related publications (70)
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Provided herein is a composition for use as a hardening regulator, e.g. hardening accelerator or hardening retarder, for building materials, as well as methods for producing thereof. The composition is characterized by a biphasic nature in which solid calc ...
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Barbara Lothenbach, Ruben Anton Snellings
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Springer2016Effect of calcium on dissolution and precipitation reactions of amorphous silica at high alkalinity
A better understanding of silica dissolution-precipitation reactions at high pH aqueous solutions allows for promotion of favorable (e.g., pozzolanic) reactions and mitigation of deleterious (e.g., alkali-silica) reactions in concrete. In this paper, the k ...
Pergamon-Elsevier Science Ltd2016Alkali uptake in calcium alumina silicate hydrate (C-A-S-H)
Karen Scrivener, Barbara Lothenbach, Émilie Michèle L'Hôpital
Uptake of the alkalis K and Na by calcium silicate hydrate (C-S-H) and calcium alumina silicate hydrate (C-A-S-H) of molar Ca/Si ratios = 0.6 to 1.6 and molar Al/Si ratio = 0 or 0.05 has been studied at 20 degrees C. Alkalis are thought to be bound in the ...
Pergamon-Elsevier Science Ltd2016Influence of calcium to silica ratio on aluminium uptake in calcium silicate hydrate
Karen Scrivener, Barbara Lothenbach, Émilie Michèle L'Hôpital
Aluminium uptake in calcium silicate hydrate (C-S-H) was studied at different Ca/Si ratios from 0.6 to 1.6 at 20 degrees C. Aluminium incorporation in C-S-H depends on the total amount of aluminium present in the sample. At low Al/Si ratio (
Pergamon-Elsevier Science Ltd2016Impact of alkali salts on the kinetics and microstructural development of cementitious systems
Supplementary cementitious materials (SCM) lower the environmental impact of cement and concrete but react more slowly than Portland cement, which therefore limits the levels of substitution possible as reasonable early strengths are necessary. One of the ...
EPFL2015A new quantification method based on SEM-EDS to assess fly ash composition and study the reaction of its individual components in hydrating cement paste
Karen Scrivener, Cyrille Dunant, Mohsen Ben Haha, Pawel Tadeusz Durdzinski
Calcareous fly ashes are high-potential reactive residues for blended cements, but their qualification and use in concrete are hindered by heterogeneity and variability. Current characterization often fails to identify the dominant, most reactive, amorphou ...
Pergamon-Elsevier Science Ltd2015Composition, silicate anion structure and morphology of calcium silicate hydrates (C-S-H) synthesised by silica-lime reaction and by controlled hydration of tricalcium silicate (C3S)
The main product of Portland cement hydration is C-S-H. Despite constituting more than half of the volume of hydrated pastes and having an important role in strength development, very little is known about the factors that determine its morphology. To inve ...
Maney Publishing2015