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The implementation of energy conservation for enclosures is a major part of building energy efficiency. At present, the main energy conservation of the envelope structure mainly adopts EPS/XPS thin-plaster outer wall external thermal insulation system, rubber powder polystyrene particle external wall external thermal insulation system and inorganic light aggregate thermal insulation system. The inorganic lightweight aggregate insulation system has the advantages of simple construction process (similar to traditional plastering), no cavity, good integrity, high compressive strength, large heat storage coefficient, good thermal insulation performance, fire resistance, and small thermal conductivity. It is especially suitable for wall thermal insulation in hot summer and cold winter areas and hot summer and warm winter areas. It has been selected by many projects in the past 2 years. With the gradual understanding of inorganic lightweight aggregate insulation mortar, it has greatly replaced plastic powder. The tendency of benzene particles to maintain the slurry.
1BLF vitrified microbead insulation mortar special BLF vitrified microbead insulation mortar is mainly composed of cement binder, cellulose ether, redispersible powder, air-entraining agent and other additives, powder and vitrification Composition of beads. The rubber powder material mainly provides the application of the vitreous bead insulation mortar, the strength of the hydration hardening, and the effect of bridging the vitrified microbeads together. The vitreous microbeads mainly play a filling role to reduce the dry density of the thermal insulation mortar and Thermal conductivity, improve insulation effect of insulation mortar. In general, the dry density decreases, the compressive strength decreases, and the thermal conductivity decreases. Due to the relatively high density of inorganic lightweight aggregates, it is difficult to develop thermal insulation mortar for inorganic lightweight aggregates with thermal conductivity less than 0.070W (nrK). Compared with BLF powder-polyphenylene granule heat-insulation special glue powder, special-purpose BLF vitrified beads heat-insulation mortar powder needs to introduce more tiny, firm and mutually independent air bubbles in the heat-insulating mortar body, and there are a lot of bubbles in the heat-insulating mortar body. At the same time, the volume stability of the thermal insulation mortar is very important. BLF vitrified beads special glue for thermal insulation mortar is compounded with some efficient air-entraining agents and foam stabilizers, making a large number of air bubbles in the glass bead insulation mortar system. Stable existence.
The BLF vitrified beads insulation mortar consists of two components: plastic powder and glass beads. I-type glass beads insulation mortar made of plastic powder glass beads = 45kg 92kg proportion mixing, wherein the powder material according to P*O42.5 cement grade fly ash vitrified beads insulation mortar special powder Wood fiber (with 1000) = (900 ~ 1000) (000) 253 (mass ratio) mixed evenly. Because BLF vitrified microbeads special mortar for thermal insulation mortar introduces a large number of independent and stable bubbles in the thermal insulation mortar, 1m3 vitrified microspheres can be formulated with more than 1m3 vitrified microbead thermal insulation mortar. The type of vitrified microbead insulation mortar is made of rubber powder, glass vitrified microbeads of water = 57kg, 90kg of proportion, wherein the rubber powder material is made of P*O42.5 cement-grade fly ash, vitrified microbeads, thermal insulation mortar and special powder wood. Fiber (1000 * i) = (650 ~ 700) G50 ~ 300) 173 (mass ratio) Mix evenly. The dry density of the type of vitrified microbead insulation mortar is about 370kg/m3, and about 1m3 of thermal insulation mortar can be prepared with 1m3 vitrified microbeads.
2 Factors affecting the performance of BLF vitrified microbeads special mortar powder 2.1 Cement materials such as cement, fly ash, etc. Cement provides cementation in the heat-insulating mortar of vitrified microbeads. Fly ash provides auxiliary gelation and reduced type. The effect of vitrified beads on the dry density of mortar.
Fly ash can reduce the dry density and increase the softening coefficient. Fly ash generally accounts for more than 30% of the mass of rubber powder. In the type I inorganic thermal insulation mortar, due to the large amount of bubbles in the thermal insulation mortar, in order to ensure the compressive strength of the type I thermal insulation mortar, the amount of fly ash in the powder type of the type I glass bead thermal insulation mortar is relatively less. At present, some small cement plants in China are very irregular in terms of the amount of admixtures, and the general buyers are unable to detect them. Although the physical properties meet the requirements of 42.5 grade Portland cement, the admixtures and admixtures in the cement can be The preparation of a vitrified microbead insulation mortar that meets expectations has a great influence. Therefore, the cement manufacturer should be selected and communicated with the manufacturer in a timely manner to adjust the formula when the cement mixture changes. The water demand of fly ash has a greater impact on the thermal insulation mortar, so fly ash with stable quality should be selected. After the cement and fly ash were selected, the mixing ratio of cement and fly ash was tested. In most cases, the proportion of cement powder and fly ash in formulated vitreous bead thermal insulation mortar is better than that of (65*70)[35-30]; the powder of I type vitrified microbead insulation mortar is prepared. Materials, the cement and fly ash ratio in the (90 * 100) [0-10] is more ideal.
2.2 Inorganic light aggregates There are many types of inorganic light aggregates, including expanded perlite, vitrified beads (closed-cell perlite), expanded vermiculite, and pottery sand. Due to the large number of open pores in expanded perlite, the large amount of water absorption, large volume shrinkage, low self-strength, and poor stability of the mixed mortar, it is not suitable for the preparation of wall thermal insulation mortar. Due to the high density of pottery sand, only a small amount of glass beads (closed-cell perlite) can be used in inorganic insulation mortars. Vitrified beads (closed-cell perlite) is a new type of inorganic thermal insulation material. It is evenly expanded from the inside to the outside by a stepped heating method of perlite with a certain particle size. The surface of the expanded particles is instantaneously heated and vitrified. After cooling, it forms a continuous vitrified closed surface, while the inside maintains a complete porous cavity structure, with advantages of light weight, heat preservation, heat insulation, fire prevention, high strength, low water absorption, and good durability. Considering the construction requirements of wall insulation mortar and the requirements of thermal conductivity and compressive strength, we should choose the vitrified microspheres (closed-cell perlite) that meet the performance indicators in Table 1.
Table 1 Properties of vitrified beads, closed-cell perlite, performance indicators 3 2 The particle size distribution of vitrified beads (closed-cell perlite) should be similar to that of medium-sized sand, and the bulk density should not be too small. When the bulk density is less than 120 kg/m3, On the one hand, its quality is difficult to control and stable. On the other hand, the closed-porosity rate of the surface is greatly reduced, and its strength is reduced. Its performance will move closer to the direction of expanded perlite and it will not be possible to formulate type I inorganic thermal insulation mortars with low dry density. In addition, it is necessary to control the dust particle content of the vitrified microspheres (closed-cell perlite). Dust particles will affect the strength of the heat-insulating mortar. When there are more dust particles, more cement material is required to enclose the vitrified microspheres (closed-cell perlite). Particles, the dry density of the formulated insulation mortar will also increase.
3BLF vitrified bead insulation mortar special glue powder preparation of thermal mortar performance according to GB/T20473*2006 key to build insulation mortar" type I and type vitrified microbead insulation mortar performance test, the results are shown in Table 2. Table 2 vitrification Micro-bead insulation mortar physical and mechanical properties of the project type I good workability wet apparent density / (kg/m3) compressive strength / MPa thermal conductivity (average temperature 25 * C) / pressure shear bond strength / kPa softening coefficient line Shrinkage /%. 4 Conclusion BLF vitrified microbeads mortar special adhesive powder to a large number of tiny, strong, independent bubbles stabilized in the insulation mortar body, greatly reducing the insulation slurry dry density and thermal conductivity, improved insulation paste The construction performance improves the compressive strength of the hardening insulation slurry. It is recommended that the ratio of type I vitrified microbead insulation mortar be: glue powder material: vitrified microbead water = 45kg300L92kg, in which the mass ratio of rubber powder material is P1O42.5 cement grade I fly ash vitrified microbead insulation mortar special Powdered wood fiber (1000膣)=(900~1000)[100~0) 253. The recommended ratio of vitrified microbead insulation mortar is: glue powder material vitrified microbead water=57kg where the quality of rubber powder material Compared to P*O42.5 cement grade I fly ash vitrified microbead insulation mortar special glue powder wood fiber (1000wm) effect BLF vitrified microbead insulation mortar special glue powder use effect of the main factor is inorganic light aggregate. Sand particles with similar grain size, 120-150 kg/m3 bulk density, and small dust particle content (closed-cell perlite) should be selected as the filler. Cement and fly ash also have a certain effect on the performance of insulation mortar.
BRIEF INTRODUCTION
Henan Yuteng Grinding Material Co., Ltd. is located in Kaifeng City, Henan Province. Is a set of production, research and development, service as one of the grinding agent, grinding, polishing products professional company, specializing in the production and sales of coated grinding tools derived ancillary products: flocking sand disc, blade, all kinds of special-shaped grinding disc, sponge grinding block, steel paper disk, ring sand belt, sand ring and automotive polishing products.
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