DRY MIX FOR OBTAINING FOAM CONCRETE
Abstract
Composition of a dry mix has been developed for production of non-autoclaved foam concrete with natural curing. The mix has been created on the basis of Portland cement, UFAPORE foaming agent, mineral additives (RSAM sulfoaluminate additive, MK-85 micro-silica and basalt fiber), plasticizing and accelerating “Citrate-T” additive and redispersible Vinnapas-8034 H powder. It has been established that foam concrete with density of 400–800 kg/m3, durability of 1,1–3,4 MPa, low water absorption (40–50 %), without shrinkable cracks has been formed while adding water of Water/Solid = 0.4–0.6 in the dry mix, subsequent mechanical swelling and curing of foam mass.
Introduction of the accelerating and plasticizing “Citrate-T” additive into composition of the dry mix leads to an increase of rheological properties in expanded foam mass and time reduction of its drying and curing. An investigation on microstructure of foam-concrete chipping surface carried out with the help of a scanning electron microscope has shown that the introduction of basalt fiber and redispersible Vinnapas-8034 H powder into the composition of the dry mix promotes formation of more finely-divided crystalline hydrates. Such approach makes it possible to change purposefully morphology of crystalline hydrates and gives the possibility to operate foam concrete structurization process.
About the Authors
S. N. LeonovichBelarus
Professor, PhD in Engineering
D. V. Sviridov
Belarus
Professor, PhD in Chemistry
G. L. Shchukin
Belarus
Associate Professor, PhD in Chemistry
P. I. Radyukevich
Belarus
A. L. Belanovich
Belarus
Associate Professor, PhD in Chemistry
V. P. Savenko
Belarus
S. A. Karpushenkov
Belarus
Associate Professor, PhD in Chemistry
References
1. Leonovich, S. N., Sviridov, D. V., Belanovich, A. L., Shchukin, G. L., Savenkov, V. P., Karpushenkov, S. A. (2012). Extension of mortar mix validity. Stroitelnye Materialy [Construction Materials], 10, 74–77 (in Russian).
2. Savenko, V. P., Shchukin, G. L., Leonovich, S. N., Sviridov, D. V., Belanovich, A. L., Radiukevich, P. I., Karpushenkov, S. A. (2012). Method for obtaining curing accelerator for concrete and construction mortars. Patent Republic of Belarus no 18077 (in Russian).
3. Velichko, ?. G., Komar, A. G. (2004). Prescribed and technological problems of foam-concrete. Stroitelnye Materialy [Construction Materials], 3, 26–29 (in Russian).
4. Udachkin, I. B. (2002). Critical challenges for development of foam-concrete production. Stroitelnye Materialy [Construction Materials], 3, 8–9 (in Russian).
5. Urkhanova, L. A. (2008). Usage of recyclable materials for foam-concrete production. Stroitelnye Materialy [Construction Materials], 1, 34–35 (in Russian).
6. Bezrukova, T. F. (1990). Additives for cellular concrete. Moscow, VNIIESM. 37 p. (in Russian).
7. Serdiuk, V. R., Vakhitov, S. G. (1983). Intensification of structure formation and curing of cellular concrete. Promyshlennost' stroitel'nykh materialov. Seriia 8. Promyshlennost' avtoklavnykh materialov i mestnykh viazhushchikh [Industry of Construction Materials. Series 8. Industry of autoclave materials and local binders], 11, 13–15 (in Russian).
8. Vasilevskaya, N. G., Engdzhievskaya, I. G., Kalugin, I. G. (2011). Cement compositions continuously reinforced by basalt fiber. Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta [Vestnik of Tomsk State University of Architecture and Building], 3, 153–158 (in Russian).
9. Vasilevskaya, N. G., Engdzhievskaya, I. G., Kalugin, I. G. (2010). Control over structure of cellular fibre concrete. Izvestiia vuzov. Stroitel'stvo [News of Hicher Educational Institutions. Construction],11–12, 17–20 (in Russian).
10. Golukov, S. A. (2004). Modification of brick glue by VINNAPAS-redispersible polymer powder. Stroitelnye Materialy [Construction Materials], 3, 47–49 (in Russian).
Review
For citations:
Leonovich S.N., Sviridov D.V., Shchukin G.L., Radyukevich P.I., Belanovich A.L., Savenko V.P., Karpushenkov S.A. DRY MIX FOR OBTAINING FOAM CONCRETE. Science & Technique. 2015;(6):24-29. (In Russ.)