Influence of Mechanical-Chemical Activation of a Binder on Physical-Chemical Properties of Heavy-Weight Concrete

Data on the influence of mechanical-chemical activation of the binder on the physical-mechanical properties of cement mortar and concrete are presented. The optimal time of mechanical-chemical activation in a rotor-pulsation apparatus has been established. It is shown that the activation of the binder leads to a significant improvement in the strength of cement composites, especially at early stages of hardening, which is important for monolithic construction. Thus, in the first days of hardening the compressive strength is increased by 249%, at the grade age – by 66% in comparison with the control composition. The mechanical-chemical activation of cement suspension leads to the formation of a more finely crystalline structure of cement stone that makes it possible to increase the durability and strength of composites obtained.

R.A. IBRAGIMOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
V.S. IZOTOV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Kazan State University of Architecture and Engineering (1, Zelenaya Street, Kazan, 420043, Russian Federation)

1. Morozov N.M., Stepanov S.V., Khozin V.G. Uskoritel of curing of concrete on the basis of galvanic slime. Inzhenerno-stroitel'nyi zhurnal. 2012. No. 8 (34), pp. 67–71. (In Russian).
2. Urkhanova L.A., Sodnomov A.E. Regulation of physical and mechanical properties of composite materials mechanochemical activation binders. Stroitel'nye Materialy [Construction Materials]. 2007. No. 11, pp. 42–44. (In Russian).
3. Uvarov V.A., Shaptala V.G., Shaptala V.V., Ovchinnikov D.A. The new direction of mechanical activation of cement. Vestnik Belgorodskogo gosudarstvennogo tekhnologicheskogo universiteta im. V.G. Shukhova. 2013. No. 3, pp. 68–73. (In Russian).
4. Qian J., Shi C., Wang Z. Activation of blended cements containing fly ash. Cement and Concrete Research. 2001. Vol. 31. No. 8, pp. 1121–1127.
5. Andreeva A.V., Davydova N.N., Burenina O.N., Petukhova E.S. Improvement of quality of fine-grained concrete by cement mechanoactivation. Politematicheskii setevoi elektronnyi nauchnyi zhurnal Kubanskogo gosudarstvennogo agrarnogo universiteta. 2013. No. 94, pp. 451–460. (In Russian).
6. Mashkin N.A., Gutareva N.A., Zibnitskaya N.E., Urusova T.A., Sharypov P.Yu. Influence of activation of cement and sand suspensions on physicomechanical properties of fine-grained concrete. Izvestiya vuzov. Stroitel'stvo. 2012. No. 11–12, pp. 26–33. (In Russian).
7. Kumar S., Bandopadhyay A., Rajinikanth V., Alex T.C., Kumar R. Improved processing of blended slag cement through mechanical activation. Journal of Materials Science. 2004. Vol. 39. No. 10, pp. 3449–3452.
8. Ibragimov R.A., Pimenov S.I., Izotov V.S. Vliyanie mekhanokhimicheskoi aktivatsii vyazhushchego na svoistva melkozernistogo betona. Inzhenerno-stroitel'nyi zhurnal. 2015. No. 2 (54), pp. 63–69. (In Russian).
9. Sajedi F. Effect of curing regime and temperature on the compressive strength of cement-slag mortars. Construction and Building Materials. 2012. Vol. 36, pp. 549–556.
10. Solov'ev V.I., Tkach E.V., Serova R.F., Tkach S.A., Toimbaeva B.M., Seidinova G.A. Research of porosity of the cement stone modified by complex organomineralny modifiers. Fundamental'nye issledovaniya. 2014. No. 8, pp. 590–595. (In Russian).