Testing of designed thermophysical parameters of walls made of autoclaved aerated concrete blocks

The object of investigation are apartment residential buildings located in various climatic zones of the Russian Federation with application of outer walls made of autoclaved aerated concrete blocks (AAC). Based on the results of thermophysical calculation it is established that application of heat conductivity of AAC according to Russian standard (GOST 31359–2007) significantly overestimates the design total resistance to a heat transfer (R-value) of walls made of AAC and it isn't recommended to use when developing the project documentation. Use of these data also overestimates a class of energy saving of buildings. Based on the results of thermophysical calculation it is shown that values of the reduced resistance to a heat transfer of the walls made of AAC conform to minimum admissible step-by-step requirements of the Russian standard (SP 50.13330.2012). Divergence of calculated and measured R-values is caused, mainly, by a discrepancy of designed thermophysical parameters of the material layers accepted depending on operated conditions of the building components...