AbstractAbout AuthorsReferences
Characteristics of a concrete mix and its sub-system СаО–SiO2–H2O are presented. Adsorption heats and the affinity of main intermediate particles Н+, ОН – , Ho и OHo to the electron are given. The mechanism of interaction of CaO with water and reasons for multivalency of the calcium atom are shown. Calcium hydrosilicates as solid solutions of the introduction of CaO and H2O into the gel of the polysiliсic acid SiО2 . nН2О with wide spheres of homogeneity are considered. Experimental data on the kinetics of calcium cations uptake by the polysilicic acid and the kinetics of SiО2 dissilution are presented. Self-oscillations of these processes have been established with addition of LST. The subsystem СаО–SiO2–H2O and the concrete mix are polystationary. Self-oscillations of concentrations of СаО и SiO2 in the liquid phase of the subsystem СаО–SiO2–H2O indicate the non-stationary, non-linear character of these processes. Chemical processes of the interaction of minerals β-C2S and C3S with water with formation of calcium hydro-silicates are necessary to analyze not from the positions of classical chemical kinetics but with the method of computer mathematical simulation
V.N. VERNIGOROVA, Doctor of Sciences (Chemistry),
S.M. SADENKO, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
S.M. SADENKO, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
Penza State University of Architecture and Civil Engineering (28, Germana Titova Street, Penza, 440028, Russian Federation)
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2. Капранов В.В. Процесс гидратации минеральных вяжущих как процесс взаимодействия частиц: Сб. трудов Челябинского политехнического института. Челябинск, 1965. С. 10.
3. Butt. Y.M., Timashev V.V. Portlandtsement [Portlandcement] Moscow: Stroyizdat. 1974. 328 p.
4. Tailor H. Khimiya tsementa. Per. s angl. [Chemistry of cement. Transl. from Eng.]. Moscow: Mir. 1996. 560 p.
5. Tailor H. Khimiya tsementa. Per. s angl. [Chemistry of cement. Transl. from Eng.]. Moscow: Stroyizdat. 1969. 504 p.
6. Shukariov S.A. Neorganicheskaya khimiya. Tom 2. [Nonorganic chemistry. Vol. 2]. Moscow: Khimiya. 1974. 384 p.
7. Vernigorova V.N., Taube P.R. Concentrational oscillations in the system СаО–SiO2–H2O. Collection of proceedings “Actual questions of building materials technology”. Leningrad. 1978, p. 11.
8. Vernigorova V.N., Taube P.R. Concentrational autoscillations in the system СаО–SiO2–H2O in the presence of additives. Zhurnal fizicheskoi khimii. 1979. Vol. 53. No. 4, pp. 966–969. (In Russian).
9. Vernigorova V.N. Fiziko-khimicheskie osnovy obrazovaniya modifitsirovannykh gidrosilikatov kal’tsiya v kompozitsionnykh materialakh na osnove sistemy SaO– SiO2–H2O. [Physical and chemical basis of modified calcium hydrosilicates formation in composite materials on the basis of system СаО–SiO2–H2O] Penza: CSTI. 2001. 394 р.
10. Zhabotinsky A.M. Kontsentratsionnye kolebaniya [Concentration fluctuations]. Moscow: Nauka. 1974. 179 p.
11. Kubasov A. A. Khimicheskaya kinetika i kataliz. Ch. 1. [Chemical kinetics and catalysis. Part 1]. Moscow: Moscow University Publishing. 2004. 42 p.
12. Vernigorova V.N., Zhilitskaya O.M. Mathematical modeling of oscillation processes in the system СаО–SiO2– H2O. Zhurnal fizicheskoi khimii. 1983. Vol. 57. No. 9, pp. 257–259. (In Russian).
For citation: Vernigorova V.N., Sadenko S.M. About nonstationarity of physical-chemical processes occurring in concrete mix. Stroitel’nye Materialy [Construction materials]. 2017. No. 1–2, pp. 86–89. DOI: https://doi.org/10.31659/0585-430X-2017-745-1-2-86-89. (In Russian).