Mechanism of highly dispersed chalk additive influence on cement stones structure formation processes
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2018, Vol 1, Issue 72
Abstract
The influence of highly dispersed chalk on cement stones structure has been investigated in the work. The study has shown that chalk contains base cations that are part of most clinker minerals. Chalk surface in water dispersion has excessive negative charge as evidenced by small negative ζ-potential value with the equipotential chalk point corresponding to рН from 5 to 7. In contrast to other carbonate rocks, chalk has specific characteristics: hydrophilicity, though slightly hygroscopic due to low dispersion and small active surface size. Chalk surface is covered with amorphous silica causing big difference of chalk, clinker minerals and their hydration products interaction character as compared with other carbonate rocks. Related composition of chalk, clinker minerals and their hydration products creates conditions for chalk use as additive to concrete. The investigation has shown that calcium carbonate interaction with hydration products happens on the surface of calcite grains. Silica is absorbed on the calcite surface causing surface recharge. Highly dispersed chalk is active towards concrete providing creation of additional crystallization that leads to structure formative and destructive factors quantitative ratio change in the period of cement stone and concrete strength synthesis. Highly dispersed chalk conditions electrical heterogeneous contact between Portland cement hydration products and carbonate. The research has shown that chalk additive for leads to low-basic calcium hydrosilicate and hydrocarbon aluminate formation. These compounds thicken the cement stone structure causing cement and concrete operational properties improvement.
Authors and Affiliations
T. V. , Zhydkova, S. N. , Chepurna, Olga Borziak
Keywords
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