DRY BUILDING THERMAL INSULATION MIXTURES
Authors
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A.S. Yestemessova
International Educational Corporation, Almaty, Kazakhstan
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E.I. Kuldeyev
K.I. Satpayev Kazakh National Research Technical University, Almaty, Kazakhstan
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R.Е. Nurlybayev
K.I. Satpayev Kazakh National Research Technical University, Almaty, Kazakhstan
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Z.N. Altayeva
International Educational Corporation, Almaty, Kazakhstan
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Y.S. Orynbekov
International Educational Corporation, Almaty, Kazakhstan
DOI:
https://doi.org/10.55956/XSYG2142Keywords:
modified binder, Portland cement, mining waste, microsilica, modified diatomite, expanded perlite sand, redispersible polymer powder, water retention capacity, thermal conductivity, frost resistanceAbstract
The article presents the results of research and development of dry construction thermal insulation mixtures based on a modified binder, modified diatomite, perlite sand, and a complex of special additives. The binder was obtained on the basis of Portland cement CEM II 32.5, a mineral additive derived from mining and processing waste, and microsilica; the activity of the modified binder is 33.61 MPa. The optimal temperature for diatomite modification was established at 900°C, at which the compressive strength reached 5.02 MPa. The developed thermal insulation mixtures demonstrated strength grades of M75 and M100, with water retention capacity exceeding the standard by 2–4%. The thermal conductivity coefficient of the compositions ranges from 0.165 to 0.183 W/m·°C, which allows them to be classified as thermal insulation materials. Adhesive strength was determined and found to depend on the type of substrate: for a concrete base, Rₐdₕ = 0.35-0.41 MPa, and for a brick base, Rₐdₕ = 0.35-0.43 MPa, with an increase of 22.8%. The frost resistance of the finishing thermal insulation composition corresponds to grade F50, and the frost resistance of the contact zone also corresponds to grade Fkz50. It was established that the use of a modified binder and thermally activated diatomite increases the compressive strength of thermal insulation mixtures, enhances early structural strength, and accelerates the hardening processes of cement-diatomite-perlite systems.
