Purpose: To investigate the possibility of using artificial pozzolana to create modified gypsum lime mortar, recommended for architecture monument restoration. Methods: At the research pursued, there were used Russia State Standard GOST 125-79 "Plaster Binders. Technical specifications", GOST 23789-79 "Plaster Binders. Test Methods", GOST 10180-90 "Concretes. Methods for Determining Strength by Control Samples", GOST 24544-81 "Concretes. Methods for Determining Shrinkage and Creep Deformations", GOST 8735-14 "Sand for Construction Works. Test Method" and GOST 8736-14 "Sand for Construction Works. Technical Conditions". It has been established experimentally that to create reliable matrix, compatible with traditional materials of historical masonry, the use of restoration composition, including metakaolin and dolomite flour, is effective. Results: The process of restoration material design to replace damaged plaster of walls and ceilings is presented, strength characteristics of stones of various compositions on the basis of air binders are discussed, conclusion is made on the necessity to develop restoration material two types: for to put on lime plaster family and for - gypsum-lime plaster family. Practical significance: The results obtained can be used at partial or complete replacement of plaster that would allow to preserve building architectural appearance.
Gypsum, lime, metakaolin, filler, compressive strength
1. Shangina N. N. Osobennosti proizvodstva i primeneniya suhih stroi tel'nyh smesey dlya restavracii pamyatnikov arhitektury / N. N. Shangina, A. M. Haritonov // Suhie stroitel'nye smesi. — 2012. — № 3. — S. 35–38.
2. Nosov K. S. Stroitel'nye rastvory russkih krepostey XVI–XVII vv. / K. S. Nosov // Rossiyskaya arheologiya. — 2009. — № 1. — S. 152–161.
3. Rahimov R. Z. Gips v stroitel'stve s drevnih vekov do sovremennosti / R. Z. Rahimov // Academia. Arhitektura i stroitel'stvo. — 2021. — № 4.
4. Puharenko Yu. V. Ocenka primeneniya karbonatnyh zapolniteley v sostave suhih smesey dlya restavracii / Yu. V. Puharenko, T. V. Haritonova // Vestnik grazhdanskih inzhenerov. — 2018. — № 4(79). — C. 121–125.
5. Gipsovye materialy i izdeliya (proizvodstvo i primenenie): spravochnik / Pod obsch. red. A. V. Ferronskoy. — M.: ASV, 2004. — 488 s.
6. Lea's Chemistry of cement and concrete / Ed. by P. C. Hewlett. — Oxford; Burlington (MA): Elsevier Butterworth — Heinemann. — 2005. — XXVI. — 1057 p.
7. Safonova T. Yu. Vliyanie reaktivnogo puccolana na svoystva smeshannogo vozdushnogo vyazhuschego / T. Yu. Safonova // Vestnik grazhdanskih inzhenerov. — 2012. — № 2(31). — S. 174–179.
8. Shangina N. N. Vliyanie mineral'nyh dobavok na usadochnye deformacii kamnya iz izvestkovogo rastvora / N. N. Shangina, T. Yu. Safonova // Vestnik grazhdanskih inzhenerov. — 2021. — № 2(85). — S. 142–149.
9. Murat M. Hydration reaction and hardening of calcined clays and related materials: I. Preliminary investigation on metakaolinite / M. Murat // Cement and concrete research. — 1983. — Vol. 2(13). — Pp. 259–266.
10. Murat M. Modification of some physical properties of gypsum plaster by addition of clay minerals / M. Murat, A. Attari // Cement and concrete research. — 1991. — Vol. 2/3(21). — Pp. 378–387.
11. Shlenkina S. S. Vliyanie plastifikatorov na tverdenie gipsovogo vyazhuschego / S. S. Shlenkina, M. S. Garkavi, R. Novak i dr. // Stroitel'nye materialy. — 2007. — № 9. — S. 61–62.
12. Freire M. T. Restoration of ancient gypsum-based plasters: Design of compatible materials / M. T. Freire, M. R. Veiga, A. S. Silva et al. // Cement and Concrete Composites. — 2021. — Vol. 120.
13. Veiga M. R. Lime-based mortars: viability for use as substitution renders in historical buildings / M. R. Veiga, A. Fragata, A. L. Velosa et al. // International Journal of Architectural Heritage. — 2010. — Vol. 4(2). — Pp. 177–195.
14. Veiga M. R. Experimental applications of mortars with pozzolanic additions: Characterization and performance evaluation / M. R. Veiga, A. L. Velosa, A. C. Magalhaes // Construction and Building Materials. — 2009. — Vol. 23. — Pp. 318–327.
15. Romera J. I. Assessment of the physico-mechanical behavior of gypsum-lime repair mortars as a function of curing time / J. I. Romera, S. Martinez-Ramirez, P. Lapuente et al. // Environmental Earth Sciences. — 2013. — Vol. 70. — Pp. 1605–1618.
16. Abdulmadzhid M. Innovacionnye kompozitnye materialy dlya ukrepleniya izvestkovyh rastvorov v tradicionnyh kamennyh konstrukciyah / M. Abdulmadzhid, M. Kassab, H. Shukri i dr. // Stroitel'nye materialy. — 2019. — № 8. — S. 42–47.
17. GOST R 57337—2016. Rastvory stroitel'nye kladochnye. TU.
