Sprayable inorganic foamed heat preservation mortar

Abstract

The invention discloses sprayable inorganic foamed heat preservation mortar. The sprayable inorganic foamed heat preservation mortar is prepared from the following components in percentage by weight:20 to 30 percent of a cementing material, 12 to 23 percent of glass beads, 3.5 to 5.5 percent of fine aggregate, 1.5 to 2.5 percent of bentonite, 0.5 to 1 percent of rubber powder, 0.06 to 0.11 percent of cellulose ether, 0.05 to 0.11 percent of staple fiber, 0.02 to 0.04 percent of starch ether, 0 to 0.1 percent of a foaming agent or 0 to 0.04 percent of an air entraining agent, 0 to 0.2 percentof a water repellent and 45 to 55 percent of water. According to the sprayable inorganic foamed heat preservation mortar disclosed by the invention, the volume weight of the sprayable inorganic foamedheat preservation mortar is reduced by adopting a mode that lightweight aggregate and the glass beads are combined with foaming; on one hand, high-performance heat preservation mortar can also be prepared by adopting lower-quality glass beads of which the water absorption rate per volume is 45 to 90 percent, a heat preservation effect is increased, and materials and energy are saved; on the otherhand, small bubbles introduced by the foaming agent (or the air entraining agent) can play a lubricating role and is capable of reducing the system viscosity and increasing the flowability, and pumped heat preservation mortar is enabled not to be in segregation; meanwhile, the volume weight of heat preservation mortar is reduced, and the spraying resilience rate of the heat preservation mortar during spraying construction is smaller than 15 percent.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a sprayable inorganic foaming thermal insulation mortar. Background technique [0002] The thermal insulation mortar used at this stage has the following problems during use. First, there are a large number of poor-quality vitrified microspheres on the market, which have a high bulk density, and the dry bulk density of the thermal insulation mortar used to prepare it is difficult to reach 350kg / m 3 , the insulation effect cannot meet the design requirements. Secondly, the glass beads have a high porosity and a large water absorption capacity. During long-term use, the volume change of the glass beads when they absorb water and lose water will cause cracks in the insulation mortar, which greatly shortens the service life of the insulation system. [0003] For example, CN200910112079.6 provides an inorganic thermal insulation dry powder mortar, which replaces cement or mix...

AI Technical Summary

Problems solved by technology

First, there are a large number of poor-quality vitrified microspheres on the market, which have a high bulk density, and the dry bulk density of the thermal insulation mortar used to prepare it is difficult to reach 350kg / m 3 , the insulation effect cannot meet the design requirements

Secondly, the glass beads have a high porosity and a large water absorption capacity. During long-term use, the volume change of the glass beads when they absorb water and lose water will cause cracks in the thermal insulation mortar, which greatly shortens the service life of the thermal insulation system.

[0003] For example, CN200910112079.6 provides an inorganic thermal insulation dry powder mortar, which replaces cement or mixed mortar, and uses hydrophobic expanded perlite and vitrified microbeads as lightweight aggregates. The existing problem is: using desulfurized gypsum as the main cementitious material , the mortar is not suitable for use in a humid environment; it is compounded with hydrophobic perlite and a small amount of vitrified microspheres. Perlite is commonly used as an open-pore structure, which has a large water absorption and is easy to pulverize. Therefore, the raw material of hydrophobic perlite is relatively rare

CN201310355801.5 provides an inorganic wall thermal insulation mortar, which mixes white cement, calcium powder, vitrified microbeads, asbestos, mica, HPMC, bentonite, lignocellulose, and gold sand to replace ordinary mortar and rubber powder polystyrene Particle thermal insulation mortar, its existing problems are: less and less light-weight high-strength glass beads with a vitrification rate of more than 95% and a water absorption rate of less than 50%, and poor quality glass bead molding thermal insulation mortar does not meet the standard requirements

However, in terms of cohesion and cohesion, the commonly used thermal insulation mortar is not suitable for spraying construction directly, and the following problems usually occur: 1. The mortar segregates during the pumping process

3. The consistency of the mortar is too large to be smoothly sprayed from the spray gun