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X-RAY DIFFRACTION ANALYSIS OF PLASTICIZED CEMENT STONE HARDENING UNDER CONDITIONS OF HEAT-MOISTURE TREATMENT

CEMENT

691.32

Dobshits, L. M. DSc in Engineering, Professor, Russian University of Transport (MIIT), Moscow, Russia

Leshkanov A. I. Lecturer of Construction Materials and Technology department, Volga State University of Technology, Yoshkar-Ola, Russia

Anisimov S. N. Candidate of Engineering Sciences, Associate Professor of Construction Materials and Technology department, Volga State University of Technology, Yoshkar-Ola, Russia

Alitinform №4 (65) 2021 г. 20-30 p.

Abstract

A comparative analysis of the cement stone structure formation was carried out depending on the modification of PCE and sulfonated naphthalene formaldehyde (SNF) under HMT conditions at 60 °C. For the first 2 hours of HMT, the amount of C3A and C4AF is greater in the stone with PCE by 12 % and 8.5 % than in the compositions without additives and 6 % and 2 % higher than in the compositions with SNF. Thus, the selective adsorption of PCE on these cement minerals is confirmed. The introduction of SNF in cement paste leads to an increased content of AFt by 32 % compared to a stone with PCE, at the same time, the amount of portlandite in a stone with SNF is lower for the first 2 hours. The content of gypsum in the compositions with PCE was found to be twice as high as in the samples with SNF and without additives for 2 hours of HMT. The number of clinker minerals after HMT according to the mode (0+6+2) h in the stone with PCE is higher than in the compositions without additives and with SNF, but the differences are lower. In general, indirectly the results indicate the relaxation of temperature stresses in the cement stone body when PCE is added. Thus, the study indicates the possibility of regulating the HMT modes during the hardening of plasticized cement systems.

Key words:

cement, heat-moisture treatment, superplasticizer, polycarboxylate ester, sulfonated naphthalene formaldehyde, X-ray diffraction analysis

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