Heat-insulating solutions using vermiculite and their optimization

Abstract

The development of effective compositions and the production of heat-insulating materials with high heat-shielding performance is relevant and requires in-depth study. The article presents the results of optimizing the composition of a heat-insulating solution prepared on a composite binder, expanded vermiculite as a filler and various functional additives. The results of optimizing the composition of the binder composition based on Portland cement and vermiculite with the MELMENT F10 superplasticizer are presented. The optimal dosage of the superplasticizer was established, which ensured the density of the composite binder of 1933 kg/m3 with a strength of 58.2 MPa. Functional additives have been selected to provide the required physical, mechanical and operational properties of the heat-shielding solution. The influence on the density and strength of the composition of the heat-insulating mortar of various dosages of the pore-forming agent Esapon 1214, superplasticizer Melment F10, redispersing powder Vinnapas LL 4042 H was studied. A regression equation was obtained for the average density and average strength of heat-insulating mortars. The resulting regression equations and nomograms built on them allow you to optimize the technological process and effectively manage it. Using the method of mathematical planning of the experiment, the composition of the heat-insulating solution was selected, which has a minimum density value of 490 kg/m3 with a compressive strength of 2.3 MPa. Among modern plaster mixtures for heat-insulating plaster mortars, the developed compositions are characterized by improved thermal properties with optimal technical and economic indicators.