How to judge the good quality of thermal insulation mortar

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New Earth Group


How to judge the good quality of thermal insulation mortar

   Thermal insulation mortarIt is a thermal insulation masonry mortar prepared by cement, original fly ash and ordinary sand. Due to the rationality of gradation, the density of mortar is improved, the thermal insulation performance is excellent, and the price is lower than the corresponding grade of cement mortar. Polybenzene particle insulation mortar is made of composite cementitious materials and has a certain particle size, grade.The polystyrene particles and other components, and the volume ratio of polystyrene particles is not less than 80% of the dry mix mortar. In the process of forming and making thermal insulation mortar, the quality of the test block is greatly affected by human factors, especially in the forming and making of rubber powder polystyrene particle thermal insulation mortar, there are mainly two problems to be paid attention.
When the thermal insulation mortar is formed, the powder, polystyrene particles and water are mixed evenly according to a certain ratio. Thermal insulation mortar production enterprises for the convenience of construction, the powder and polystyrene particles have been mixed together before leaving the factory, polystyrene particles and powder due to different density and particle size, easy to produce separation in the handling process, powderThe material is easy to sink at the bottom of the bag. If the powder is too much, it will cause the test results of thermal conductivity to be high and the compressive strength to be high; on the other hand, if the polystyrene particles are too much, it will cause the thermal conductivity to be low and the compressive strength to be low. In this case, first of all, the polystyrene particles should be fully mixed with the powder and then fully stirred with water until the polystyreneParticles, powder and water are fully mixed. If the polystyrene particles and powder are separated during the entrusted detection, first, the powder and water shall be fully stirred according to the specified mixing ratio, and then the polystyrene particles shall be added and stirred evenly.
When making 300mm × 300mm × 300mm test blocks, it is better to use three combined bottomless metal test molds, and it is better to use polyethylene film on a horizontal plane as the bottom frame than glass. If the bottomless metal test mold is placed on the glass, even if a large amount of release agent is painted on the glass, it is still difficult to release the mold from the glass, and the surface of the test piece will be stuck.Many mold release agents increase the workload of grinding. If the grinding is uneven, it will bring errors to the later thermal conductivity test. The polyethylene film is more convenient to use, just brush a small amount of release agent can easily release. During the preparation of the test piece, special attention should be paid to prevent the slurry from leaving pores, and the standard slurry should be applied with a putty knife.The material is filled layer by layer and slightly higher than the test mold. If a 100mm × 100mm × 100mm test block is made, it is necessary to use a tamper to uniformly refract and insert 25 times from the outside to the inside, insert several times along the mold wall with a putty knife, and then smooth it. Since the strength and rigidity of the test block removed after 7 days of curing under the temperature condition of the laboratory are relatively low, the removal of the mold should be careful.Pen. When the mold is removed, the test block is easily damaged if the action is too fast and the force is too large. In addition, the test block just removed should be placed flat, otherwise it will slowly deform during the curing period and even damage the test block.
Detection of rubber powder polystyrene particle thermal insulation slurry and vitrified hollow bead thermal insulation slurry: rubber powder polystyrene particle thermal insulation slurry is composed of rubber powder material and polystyrene particles, vitrified hollow bead thermal insulation slurry is a single-component dry-mixed mortar formed by uniformly mixing vitrified hollow beads as aggregate and modified dry powder binder. During construction, water is added and stirred evenly, smeared or sprayed.On the base wall, its thermal insulation performance and mechanical properties are closely related to the dry density. Dry density specimen size: rubber powder polystyrene particle thermal insulation slurry is 300mm × 300mm × 30mm, vitrified microsphere thermal insulation slurry is 70.7mm × 70.7mm × 70.7mm, compressive strength specimen size is 100mm × 100mm × 100mm. systemFor the standard test piece of thermal insulation slurry, the mixture shall be prepared by mixing according to the proportion specified in the product specification or the water-material ratio recommended by the manufacturer. The mixture shall be evenly mixed according to the mixing method specified in the specification. The putty knife is allowed to be used for several times, and then the higher part of the mixture shall be cut off and leveled along the top surface of the test mold. For use after the test piece is formedPolyethylene film frost cover and curing as required.
Through the above test, we can see the performance quality of thermal insulation mortar. Due to the unequal test conditions, the specific operation comparison needs to be carried out according to the actual situation.

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