Evolution of Ettringite and Thaumacite in Cement Stone | Chapter 9 | Current Innovations in Chemical and Materials Sciences Vol. 3

 The processes of hydration and thickening of cement systems are still individual of the urgent questions of modern construction materials science. In particular, this concerns the function of the expansive aspects of ettringite and thaumacite, especially in the late stages of building formation. The trouble lies in the reality that these two phases are isomorphic for each other and can transform into each one throughout the progress of cement stone. Many attempts have existed made by investigators from different nations to explain the type and mechanism of action of these fundamental neoplasms. In the course of numerous studies, it has happened found that under sure conditions in the vicinity of iron compounds and other polyvalent metals, ettringite does not cause hurtful phenomena in cement grain even in the late stages of hardening. In the presence of plasticizers, hydrogen and carbamide solutions play a certain role. However, distinctive attention command a price of to the processes of carbonation, sulfate and carbon dioxide disintegration and the introduction of carbonate supplements, which even in the attendance of two-water gypsum do not lead to the growth of the products of hydration and hydrolysis of cement. Experiments on strained carbonation of cement stone have existed carried out and the beneficial role of carbonate supplements, especially dolomite, the composition of hardening structures and endurance has been proved. The authors propose a science for the care of concrete later thermal liquid treatment by ownership products in an atmosphere of colorless odorless gas. It is shown that even in the demeanor of two-water gypsum secondhand as a cement setting retarder and plasticizer, carbonate supplements in combination accompanying sucrose and urea answers prevent concrete disintegration and increase the durability of cement plans.

Author(s) Details:

V. K. Kozlova,
Department of Building Materials, Polzunov Altai State Technical University, Russia.

A. V. Wolf,
Department of Technology and Mechanization of Construction, Altai State Technical University, Russia.

V. D. Zavadskaya,
Novosibirsk State University of Architecture and Civil Engineering, Novosibirsk, 630008, Russia.

S. V. Samchenko,
National Research Moscow State University of Civil Engineering, Moscow, 129337, Russia.

D. A. Afanasyev,
Director General of NIOST OAO «SIBUR», Tomsk, 634067, Russia.

N. P. Gorlenko,
Tomsk State University of Architecture and Building, Tomsk, 634003, Russia.

Yu. S. Sarkisov,
Tomsk State University of Architecture and Building, Tomsk, 634003, Russia.

Please see the link here: https://stm.bookpi.org/CICMS-V3/article/view/12598