Study on mix ratio of low water absorption vitrified beads insulating mortar in hydrothermal environment
In order to address the significant issue of wind driven rain(WDR)phenomenon in the southeast-ern coastal areas,which can easily cause water seepage on building exterior walls and deterioration of wall ma-terials,a total of 14 groups of mix proportion tests were carried out in two stages.A low-water-absorption vitri-fied beads cement-based material for exterior walls was prepared and studies were conducted about the changes in thermal properties such as water absorption rate and thermal conductivity after water absorption in humid and hot environments.Research results indicate that compared with concrete,vitrified beads cement-based ma-terials can significantly reduce the thermal conductivity and water absorption of the material,showing excellent thermal performance.Vitrified beads insulation blocks can effectively improve the thermal performance of blocks,but also reduce the compressive strength of the materials.Compared with ordinary concrete,the ther-mal conductivity,cumulative water absorption after 7 days,and thermal conductivity after 7 days of water ab-sorption of vitrified microsphere cement-based materials are 0.336 W/(m·K),185.8 g,and 0.483 W/(m·K),respectively,which are 26.4%,62.4%,and 30.1%of those of concrete respectively.After 7 days of water ab-sorption,the thermal conductivity increases by 0.147W/(m·K),which is 44.3%of that of concrete.
hydrothermal environmentlow water absorptionvitrified beads cement-based materialsmix ratio test
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