THE IMPACT OF MINERAL AGGREGATES ON THE THERMAL CONDUCTIVITY OF CEMENT COMPOSITESSergei Aleksandrovich Korotaev, Vladimir Ivanovich Kalashnikov, Vladimir Ivanovich Rimshin, Irina Vladimirovna Erofeeva and Vladimir Leonidovich Kurbatov
Aggregates of different nature and grain-size composition allow to purposefully adjusting the structure and properties of the cement matrix of concrete. The article presents the results of the research of the impact of the grain-size composition of mineral aggregate on the thermal conductivity of cement composites. Grainsize composition was varied by mixing in a predetermined ratio three aggregate fractions with narrow grading, with a grain size of 0.630.315, 0.315-0.16 and less than 0.16 mm. The simplex-lattice design of the experiments was implemented for three fractions of aggregate. The thermal conductivity of the sample is calculated according to the formula, which establishes the dependence of thermal conductivity on the heat capacity, thermal diffusivity and density of a sample. Heat capacity, thermal diffusivity and density of the samples were determined experimentally. These results showed that for the studied range of variation of the grain-size composition the thermal conductivity of filled cement composites depends on the type of aggregate and varies from 0.19 to 0.31 W/(mK).
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