Physico-mechanical and physico-chemical hardening process changing research in gypsum binder and transition in gypsum-cement binder and then to gypsum-cement-pozzolanic using with mechanical tests and x-ray spectroscopy

Gypsum-Cement-Pozzolanic binder (GCPB) has been invented in 60-s of last century in USSR by group of scientists under Mr. A. Volzhenskiy leadership. In that time in USSR and actually in US construction technological processes of civil and industrial buildings increasing a lot. So demand of cement for heavy concretes as a main component high up day to day, year to year. But realisation of that idea in practical way wasn’t easy thing because as we know from «Material science» course – cement is hydraulic binder which hardening in moisture condition or in must cases in water and if we sae about gypsum is an air binder. That means gypsum is hardening and gets its high compression strength in air condition and loosing that strength in moisture condition or under influence of water. After analysing knowledge that have been written above about GCPB we may stay some problems in front of us: 1) First problem connect with modern theoretical physical-mechanical and physical-chemical researches absence, when GCPB hardening process have been described by modern X-Ray spectroscopy and mineralogical analysis. All what we have found in internet resources is basic and theoretical issue with some mechanical tests. 2) Also the main problem when we start see on that researches and mechanical tests, there are some conflicting things as links for technical requirements of GCPB through ages, storage conditions before tests. So according by what we have said above we choose some targets of our research: a) How gypsum binder’s physical-mechanical characteristics going to change as it would be main stuff for GCPB preparing. And also transition process gypsum binder(GB) in gypsum-cement binder (GCB) and then in gypsum-cement-pozzolanic binder (GCPB); b) How gypsum binder’s physical-chemical characteristics going to change during transition process in GCB and then into GCPB with X-Ray spectroscopy analysis.

1. Properties of construction and high-strength gypsum, Internet source, pp. 2–3 (https://ozlib.com/953360/himiya/svoystva_stroitelnogo_vysokoprochnogo_gipsa).

2. Composite binders. Methodological guidelines for the implementation of course work for students in the direction 270800.62 “Construction”, profile “production of building materials, products and structures”. Moscow State University of Civil Engineering, Department of Technology of Binders and Concretes. Internet source. Moscow, 2014. P. 6. (https://mgsu.ru/universityabout/Struktura/Instituti/ISA/metodobesp/tekhnologiya-vyazhushchikh-veshchestv-ibetonov/Metodicheskie%20materialy%20po%20kompozicionnym%20materialam.pdf?ysclid=l2fyrxpufpи).

3. Popov L.N. Laboratory control of building materials and products: Handbook. Moscow, Stroyizdat, 1986.

4. Popov K.N., Kaddo M.B., Kulkov O.V. Assessment of the quality of building materials. Moscow, DIA, 1999.

5. Internet source: Properties of construction and high-strength gypsum. P. 3. (https://ozlib.com/953360/himiya/svoystva_stroitelnogo_vysokoprochnogo_gipsa).

6. Volzhensky A.V., Burov Yu.S., Kolokolnikov V.S. Mineral binders. Moscow: Stroyizdat, 1973, pp. 462–466.

7. GOST 125-2018 “Gypsum binders. Technical conditions”. Minsk, Eurasian Council for Standardization, Metrology and Certification, 2018.

8. GOST 23789-2018 “Gypsum binders. Test methods”. Minsk, Eurasian Council for Standardization, Metrology and Certification, 2018.

9. TС 21-31-62-89 “Gypsum-cement-pozzolan binder. Technical conditions” (1989). Moscow, Publishing House of Standards, 1989.

10. Gorshkov V.S., Timashev V.V., Savelyev V.G. Methods of physico-chemical analysis of binders. Moscow, Higher School, 1981, pp. 196, 284, 285, 292.