Research in Dependence of Heat Conductivity on Density and Coefficient of Thermo-Technical Quality of Autoclaved Concrete

The relevance of the theme of the work is due, on the one hand, to the obsolete nature of the studies described earlier, since the results obtained in them reflect the thermophysical characteristics of aerated concrete produced on equipment and technologies different from modern ones, and on the other hand, the current activity of updating normative documents in the field Thermal protection of buildings. The paper describes the results obtained for determining the thermal conductivity in the dry state and the thermo quality factor (TQF) for auto- claved aerated concrete of modern production with a range of grades in density from 100 to 600 kg/m³. The dependence of the thermal conductivity of the material in the dry state on the density is constructed, an equation describing this dependence is presented. A comparison of the obtained dependence and data in the current SP 50.13330 is made, a conclusion is made about the greater accuracy of the results obtained. The dependence of TQF aerated concrete on density is presented – the results obtained are correlated with classical works on this topic. It is found that the TQF value of the investigated grades according to the density of aerated concrete is approximately the same and is equal to 0.04 1/%. The obtained data on the values of thermophysical parameters can be used for designation and analysis of calculated values for the thermal conductivity of aerated concrete, as well as for updating and issu- ing new regulatory documents in the field of thermal performance of buildings and production of aerated concrete.

P.P. PASTUSHKOV, Candidate of Sciences (Engineering), (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.G. GAGARIN, Doctor of Sciences (Engineering), Corresponding Member of RAACS (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Research Institute of Building Physics of RAACS (21, Lokomotivny Passage, Moscow, 127238, Russian Federation)

1. Grinfeld G.I., Korkina E.V., Pastushkov P.P., Pavlenko N.V., Erofeeva I.V. The system of the protecting designs providing the increased energy saving in buildings. Nauchnyi vestnik Voronezhskogo gosudarstvennogo arkhi- tekturno-stroitel’nogo universiteta. Stroitel’stvo i arkhitek- tura. 2016. No. 3, pp. 25–35. (In Russian). 
2. Silaenkov E.S. Dolgovechnost’ izdeliy iz yacheistykh be- tonov [Longevity of products from cellular concretes]. Moscow: Stroyizdat. 1986. 174 p. 
3. Gaevoy A.F. Kachura B.A. Kachestvo i dolgovechnost’ ograzhdayushchikh konstruktsiy iz yacheistogo betona [Quality and durability of the protecting designs from cel- lular concrete]. Khar’kov: Vishcha shkola. 1978. 224 p. 
4. Künzel H. Gasbeton. Wärme- und Feuchtigkeitsverhalten. Wiesbaden–Berlin: Bauverlag. 1970. 120 S. 
5. Vishnevsky A.A., Grinfeld G.I., Smirnova A.S. Russian market of autoclave gas concrete. Results of 2016. Stroitel’nye Materialy [Construction materials]. 2017. No. 3, pp. 49–51. (In Russian). 
6. Grinfeld G.I., Korkina E.V., Pastushkov P.P., Pavlen- ko P.P., Erofeeva I.V., Gubanov D.A. Researches of heat conductivity of cellular concretes. Topical issues of archi- tecture and construction: Materials of the XIV-th International scientific and technical conference. Saransk. 2015, pp. 21–24. (In Russian). 
7. Pastushkov P.P. Calculated definition of operational hu- midity of autoclave aerocrete of the D300-600 brands. Tekhnologii betonov. 2016. No. 3–4, pp. 20–23. (In Russian). 
8. Gagarin V.G., Pastushkov P.P. Definition of calculated humidity of structural materials. Promyshlennoe i grazh- danskoe stroitel’stvo. 2015. No. 8, pp. 28–33. (In Russian). 
9. Gagarin V.G. The theory of a state and transfer of mois- ture in structural materials and heat-shielding properties of the protecting structures of buildings. Doctor Diss. (Engineering). Moscow. 2000. 396 p. (In Russian). 
10. Pastushkov P.P. The theory of a state and transfer of moisture in structural materials and heat-shielding properties of the protecting structures of buildings. Cand. Diss. (Engineering). Moscow. 2013. 169 p. (In Russian)