Abstract
The DTA/TG and calorimetric measurements were applied in testing the effect of fine-grained waste expanded perlite as an active component of cement mixtures. The studies were performed with aim to evaluate the kinetics of cement hydration and the modification of phase composition in the presence of additive. The series of mixtures were produced with perlite 2–35 % added to cement. The acceleration of cement hydration was proved due to the pozzolanic reaction between the active amorphous fine-grained perlite. An attempt to elucidate the mechanism of cement–perlite interaction was presented, based on the results of bound water content by TG measurements.
Highlights
Perlite is an amorphous volcanic rock occurring mainly in the Mediterranean Sea area
The heat of hardening was measured in the nonisothermal– nonadiabatic microcalorimeter on the pastes produced from 5 g cement samples with various (2–35 %) additions of ground waste expanded perlite at constant water/cement mass ratio = 0.5
The calorimetric measurements were performed in order to investigate the role of perlite in cement early hydration
Summary
Perlite is an amorphous volcanic rock occurring mainly in the Mediterranean Sea area. Due to its glassy structure and high silica and alumina content, perlite can be classified as a natural pozzolanic material. The properties of natural perlite as a supplementary cementing material have been mentioned in some reports [1, 2]. The properties of perlite composites can be shaped by the proportions between the main constituents and by use of modifiers [3]
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