Abstract
In the present study, the hydration of Portland cement pastes containing 5%, 10%, 15% and 20% tuff, limestone filler and granodiorite was investigated by thermogravimetric analysis coupled with differential scanning calorimetry and microcalorimetry isotherm. The monitoring of the hydration kinetics by thermogravimetric analysis made it possible to quantify the quantity of water combined with the cement (nonevaporable water) and the degree of hydration. By coupling this technique to the differential scanning calorimetry, it was also possible to measure the energy absorbed or released by the material during its decomposition. The results showed that the non-evaporable water content and the degree of hydration of the mixtures containing various mineral admixtures were relatively lower with respect to the reference mixture when as the content of mineral admixture increased. The effect of the evolution of the hydration process on the mechanical properties of mortars was also monitored. The relative variation of the compressive strength to that of the flexural strength was evaluated at 7, 28 and 90 days. Results showed that all the mixtures have a greater contribution in flexion than in compression.
Highlights
The constituents of Portland cement undergo a series of chemical and physical processes when mixed with water
The vibration intensities at 3415 cm-1 and 1638 cm-1 indicates the formation of calcium silicate hydrates (C-S-H)
This paper presents the influence of the type and level of mineral admixture in the binder on the evolution of the hydration process and its effect on the mechanical properties
Summary
The constituents of Portland cement undergo a series of chemical and physical processes when mixed with water. The explanation of its hydration is done, in general, by considering the individual hydrations of the major compounds and their interactions with each other and with other minor phases present in the cement. These considerations affect both the mechanism and the kinetics of hydration. The mechanism and kinetics of the hydration of mineral admixture incorporated cements is of great importance Some of these materials are considered as inert substances and their effect on hydration is more of a physical nature, some others are of significant chemical reaction with the Portland cement phases.
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