Influence of the Ca/Si ratio on the compressive strength of cementitious calcium–silicate–hydrate binders
By W. Kunther, S. Ferreiro, J. Skibsted. 2017
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The relation between the chemical composition of calcium–silicate–hydrate (C–S–H) phases and its influence on the compressive strength of cementitious materials is investigated by a new approach where prisms of C–S–H phases have been synthesized directly by the reaction of calcium hydroxide, amorphous SiO2 and water. The synthesized samples employ molar Ca/Si ratios of 0.83, 1.0, 1.25 and 1.50, and the compressive strengths and age-depending changes of the pastes have been followed for up to three months of hydration, after which the microstructures were characterized. The model pastes feature most characteristics of hydrated cements, including zones of different density but similar chemical composition. The experimental data demonstrates that the compressive strengths of the C–S–H pastes increase for decreasing Ca/Si ratio for all synthesized samples and testing ages. The molar volumes of the C–S–H phases decrease with decreasing Ca/Si ratio, which along with the related higher surface areas may partly explain the differences in strength development.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/bc9eb8b876066d94e900064c722a0d2ec2f005a8
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Citations in the corpus
- Fracture properties and microstructure formation of hardened alkali-activated slag/fly ash pastes (2021, background): “Fracture properties of AASF paste and the Ca/Si ratio of the reaction product Several hypotheses have been developed by previous studies to explain the factors determining the mechanical properties of cementitious materials, which include (I) the porosity, (II) the phase assemblage, and (III) the co”
- Influence of SiO2, TiO2 and Fe2O3 nanoparticles on the properties of fly ash blended cement mortars (2020, background): “6 for mortar with fly ash and nanoparticles [20,63].”