Dry powder thermal insulation mortar is a new type of building material that has been rapidly developed in recent years. Because of its great significance for protecting the environment, saving energy, reducing construction cost and improving engineering quality, it has received extensive attention. However, various types of dry powder insulation mortar are applied to the building, especially after forming the insulation layer, which will face a common problem. Because of its porous lightness, it has strong water absorption, and is greatly affected by the external environment. Poor sex, deterioration of insulation and sound absorption performance directly leads to a decrease in overall insulation performance. Although it is possible to take certain protective measures against this, it is difficult to solve this problem fundamentally.
In this paper, vitrified microbeads are used as lightweight aggregates, cement and gypsum are used as cementitious materials, and metakaolin wastes are used as fillers to prepare thermal insulation mortars with low density, high strength, porous holes and low thermal conductivity. In particular, the surface modification of the thermal insulation layer is achieved by adding a small amount of a hydrophobic agent.
1 Experiment The aggregate and filler of thermal insulation mortar were weighed according to the total volume ratio, and the ratio of suitable vitrified microbeads, cement and waste residue was determined. The bone filler is uniformly mixed and stirred in a dry state. According to the use of different hydrophobic materials, 4 sets of experimental dry powders (see Table 1) were accurately weighed and added to the bone filler to continue mixing evenly, and then stirred in a cement mortar mixer to form a free-flowing viscous slurry. The slurry was separately molded into a mold, and after d, it was taken out for a moisturizing angle test, and then dried and cured according to the method specified in G149-2002. After 8 days, the moisture temperature angle was measured again.
The amount of hydrophobic material added in each test block is the best amount of hydrophobic effect in the laboratory. Polypropylene fiber is added to the formula to improve the shear strength of the test block. RI554Z is a dispersible polymer powder with hydrophobic effect.
Table 1 Determination of hydrophobic materials and wetting angles used in test blocks Hydrophobic material Heavy calcium powder fatty acid silane based powder (S3) 2 After wetting angle / (°) d After wetting angle / (° Wetting angle difference /(°2 Results and Analysis 2.1. Water condition 4 groups of thermal insulation mortars used metakaolin waste as filler, so the test blocks were all slightly white, and the surface of S1 was observed to be rough and crusted after molding; S2 surface More compact, but no crust performance; 3, S4 surface compact and flat block shape good cross-section hole size and uniform structure.
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