Research of Cracking Resistance of Thermal Insulation Coatings for Aerated Concrete

2019 ◽  
Vol 974 ◽  
pp. 458-463 ◽  
Author(s):  
Valentina Loganina ◽  
M.V. Frolov
Keyword(s):  
Moisture Content ◽  
Crack Resistance ◽  
Tensile Properties ◽  
Uniform Distribution ◽  
Thermal Insulation ◽  
Water Demand ◽  
High Water ◽  
Expanded Perlite ◽  
Expanded Vermiculite ◽  
Aerated Concrete

The high water demand of finishing compositions obtained using expanded perlite and vermiculite sand reduces the crack resistance of the resulting thermal insulation coatings. The use of microspheres as fillers should make it possible to increase the crack resistance of the resulting coatings. The crack resistance of lime heat-insulating coatings for the finishing of aerated concrete obtained using ash microspheres of aluminosilicate and expanded vermiculite sand has been determined. It is established, that coatings obtained using aluminosilicate ash microspheres, are characterized by good crack resistance due to low shrinkage deformations, high ultimate tensile properties and uniform distribution of moisture content in the process of moistening.

scholarly journals Performances of vermiculite and perlite based thermal insulation lightweight concretes

2020 ◽  
Vol 52 (2) ◽  
pp. 149-162
Author(s):  
Anja Terzic ◽  
Jovica Stojanovic ◽  
Ljubisa Andric ◽  
Ljiljana Milicic ◽  
Zagorka Radojevic
Keyword(s):  
Phase Composition ◽  
Thermal Insulation ◽  
Mix Design ◽  
Expanded Perlite ◽  
X Ray Diffraction ◽  
Mineral Phase ◽  
X Ray ◽  
Expanded Vermiculite ◽  
Concrete Mix ◽  
Aluminate Cement

This experimental study was conducted with an aim to investigate the effect of the elevated temperature on the mineral phase composition, microstructure and mechanical properties of the thermal insulation lightweight concretes. The first group of experimental concretes was based on the expanded vermiculite and expanded perlite used as lightweight aggregates (in 65 wt%) in combination with either ordinary Portland cement or refractory calcium aluminate cement. The mix-design of the second group of concretes comprised standard quartz aggregate, vermiculite or perlite as aggregate replacement (25 wt%) and binder (PC or CAC). A total of 10 concrete mix-designs were fabricated in form of 40?40?160 mm samples which were submitted to heat-treatment at 400?, 600?, 800? and 1000?C upon standard 28-days period of curing and hardening. The changes in crystallinity and mineral phase composition induced by temperature were monitored by X-ray diffraction technique. Microstructural visualizations of the non-fired and fired concrete samples were conducted by scanning electron microscopy accompanied with EDX analysis. The results indicated that despite the decrease in compressive strengths upon firing, investigated lightweight concretes can be categorized both as thermal insulators and structural materials.

Measuring the Thermo-Technical Parameters of Autoclaved Aerated Concrete

2016 ◽  
Vol 824 ◽  
pp. 100-107 ◽  
Author(s):  
Alena Struhárová
Keyword(s):  
Thermal Conductivity ◽  
Moisture Content ◽  
Physical Properties ◽  
Bulk Density ◽  
Capillary Absorption ◽  
Measuring Device ◽  
Technical Parameters ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Technical Properties

Bulk density and moisture content are factors that significantly affect the physical properties of autoclaved aerated concrete (AAC) including thermal conductivity and other thermo-technical characteristics. This article shows the results of measurements of compressive strength, capillary absorption, water absorption and porosity of AAC (ash on fluidized fly ash) at different bulk density and also the results of thermal conductivity of AAC at different bulk density and variable moisture content of the material. The thermo-technical properties were measured using the Isomet 2104, a portable measuring device. Acquired results demonstrate dependence of physical properties including thermal conductivity of AAC on bulk density and moisture content. The reliability and accuracy of the method of measuring was also shown.

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