Preparation of High Performance EPS Exterior Insulation Mortars ZHANG Guihong, PENG Jiahui, ZHANG Jianxin, CHEN Mingfeng (Department of Building Materials, Chongqing University, 400045) The prepared EPS insulation mortar has excellent workability, hot workability, and crack resistance and has been applied in large scale in construction projects.
Experimental research and implementation of building energy conservation must greatly improve the external protective structure, especially the thermal performance of the external wall. External insulation is the most effective way to improve the thermal performance of external walls.
The large amount of polystyrene foam (EPS) that is discarded in China each year becomes white pollution that is harmful to the environment due to the difficulty in handling and degradation. With the characteristics of large EPS thermal resistance, alkali corrosion resistance, good chemical stability, and high toughness, as a lightweight aggregate for the preparation of external thermal insulation mortar, it can effectively solve the problem of white pollution and realize the recycling of building materials for waste EPS.
1 raw materials and test methods 1.1 raw materials and 17.0kg/m3 of pre-expanded EPS particles, two kinds of particle volume ratio of 1 cellulose ether selected viscosity of 60,000 MPaus hydroxypropyl methyl cellulose ether; redispersible polymer powder selected vinyl acetate Ester and ethylene copolymer resin; polypropylene fiber diameter 40 Young's modulus 3790MPa, elongation 18%, length 8mm. Silicone waterproofing agent and coupling agent are commercially available industrial products.
1.2 Test method In accordance with the provisions of JG158-2004 Powdered Polystyrene Particles External Wall Insulation System, control the dry density of thermal insulation mortar at 230*0kg/m3, wet density 420kg/m3, consistency at 9.040.0cm, delamination, The determination of compressive strength, flexural strength, shrinkage, softening coefficient, and volumetric water absorption is based on the basic properties of JGJ70-90 building mortar.
Table 2 Effect of the overall performance of the EPS thermal insulation mortar delamination degree bookmark5 doping amount delamination degree (cm) softening coefficient crimp ratio compression shear bond strength MPa) saturated hydraulic shear bond strength MPa) tensile strength MPa) dry shrinkage Rate%) Volume water absorption%) EPS thermal insulation mortar has been applied in a number of construction projects such as Longhu - Purple City, Longhu - Guanshanshui, Huayu - Xicheng Lijing in Chongqing, and has become an energy-efficient building in Chongqing and surrounding areas. The preferred material.
D Surface modification of EPS particles with a coupling agent, making the surface hydrophobic from hydrophobic to hydrophilic, successfully solved the technical problem of non-wetting between inorganic gelling materials and EPS, and formulated EPS thermal insulation mortar. Foundation.
2) The redispersible latex powder can effectively improve the workability and bond strength of the EPS thermal insulation mortar, and the suitable dosage is 6.0kg/m3; the cellulose ether can greatly increase the water retention of the EPS thermal insulation mortar, and the suitable amount is 1.7 kg /m3; Polypropylene fiber can significantly improve the EPS thermal insulation mortar crack resistance, the appropriate amount of 0.1%.
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