Development Of EPS Insulation Mortar And Project Application

The implementation of building energy-saving must be a substantial increase on the thermal insulation properties of outer building envelope, especially the external walls. Insulation mortar is to be taken one of the major energy-saving measures because of its thermal insulation properties, convenient construction, low cost and can adjust the thermal resistance of wall with changing the density and thickness of insulation mortar. In recent years, expanded polystyrene(EPS)develops rapidly in China, about 10 million cubic meters of waste EPS need to be dealt with each year, because they can not be treated and degraded and then become the white pollution to the environment. The insulation mortar with excellent construction, thermal and weatherability is prepared by the waste EPS which be broken into particles with the granularity of less than 5 mm as the lightweight aggregate, recycling waste, and becomes the effective way for waste EPS as resources of building materials.This paper focuses on increasing the workability of construction, thermal properties and weatherability of EPS insulation mortar, preparation of renewable EPS insulation mortar with excellent cost-effective. Selecting renewable polystyrene particles with excellent grading as a lightweight aggregate, making full use of its large thermal resistance, alkali-resistant corrosion, chemical stability, larger toughness, and irregular surface characteristics of its particles, improving the thermal, water-resistant, workability of construction, and other properties of insulation mortar, the granularity and grading of EPS are confirmed through test analysis; Modificating the surface of renewable polystyrene through the mixing of redispersiable latex powder binder particles from hydrophobic to hydrophilic, having successfully resolved the technical problems such as the inorganic gelling materials and polystyrene particles being not wet with each other, poor workability of mixture, and low bond strength; Improving workability of the insulation mortar by using water-retentive and thickening action of the cellulose ethers and using latex powder binder to improve the water-retentive and cohesion of the products; Using polypropylene fiber toughened measures to improve the toughness and crack resistance of insulation mortar, effectively reducing the linear shrinkage of mortar; Using the modified role of organosilicon waterproofing agent to effectively improve the water-resistant mortar bond strength of the insulation mortar and reduce the water absorption in volume and enhance the water-resistant and impermeability of the mortar.The influence of various components on the properties of EPS insulation mortar is studied by experiments, the type and the best dosage of the major components are identified as follows: ordinary portland cement of 42.5 R with dosage of 162kg/m3; 0~5mm renewable EPS particles with dosage of 1200L/m3; redispersiable latex powder binder particles of Dalian Chemical DA-1410 with dosage of 5.0~ 6.0kg/m3; Cellulose ether of Shandong Ruitai with dosage of 1.5~ 1.7kg/m3; polypropylene fiber 6mm length with dosage of 0.9~ 1.1kg/m3; organosilicon waterproofing agent with dosage of 0.6kg/m3.Based on the current situation in the external walls of the different finishes, combining with the excellent performance of their products of polystyrene insulation mortar, two different external thermal insulation structure system that using EPS are identified: paint finishes structure system and tile finishes structure system, and establish their own construction technology, effectively guaranteed the specification of the construction and the application of the system.Application of engineering indicates that: the EPS insulation mortar thermal insulation system has good workability, high thermal properties, good weatherability and convenient construction, and low cost for engineering, and its products having obvious advantages on cost-effective, being the highly competitive insulation materials, can be widely used in the exterior insulation works.