Cracking Analysis And Optimization Of Mineral Slurry Flooring Thermal Insulation System Based On Ansys

With the economic development of China, the contradictory between energy outputand consumption is prominent day by day. Our country gave a higher requirement tobuildings energy efficiency. Recently, the selection of materials and ground floorstructures has been tried many times with the promotion of ground floor insulation.Although using EVB thermal insulation system own such a lot of advantages, thisinsulation system is apt to hollow and crack due to various reasons.This paper explores the stress condition of ground floor insulation system in thehumidity field by Ansys. Through simulation analysis, we found that use the approachof measure concrete specimens shrinkage to inverse optimization humidity fieldparameters is feasible, and after two optimization process can be get high precisionhumidity field parameters, has been very close to the true value; This paper studies thedistribution of the stress of the protective layer of concrete under different curinghumidity, wind speed, age, dimensions and structural conditions: The distribution ofhumidity field in our specific simulated loads and constraint conditions is that humiditydecreases gradually from bottom to top, and the humidity values are the same in samesurface; the distribution of stress field is that stress values are the same in the centralarea and there is a stress concentration belt on periphery region while the strain of foursides are small, coming to being a narrow low stress region. Because protective layer ofconcrete deformation when the protective layer and the insulation layer composite,insulation are subject to certain stress at the bottom of the concrete protective layerapplied thereto; The higher the relative humidity of conservation of the environment inthe ground floor insulation system, the less moisture stress field, when curing humidityabove85%, the risk of cracking of concrete cover will greatly reduce; Conservation ofthe environment in concrete protective layer wind speed has greater impact on humidityfield stress, the faster wind, the greater humidity field stress; Concrete humidity fieldstress grows with age, the stress basically not increase after28d; With the humidityconservation increasing, produce cracks age postponed; The size and thickness ofsimulate were influential on the concrete stress, the larger size, the thinner thickness ofconcrete, the greater stress; When structural mutations stresses will be centralized in asmall range of local.By optimizing the ground floor insulation system materials ratio, curing conditions and structure measures can effectively reduce the stress of ground floor insulationsystem, reduce the cracking risk of the concrete protective layer. Mixing6%expansionagent and0.9kg/m3polypropylene fibers fine stone concrete28d shrinkage can bereduced by11.5%, splitting tensile strength improved by8.8%. Mixing60%aggregate,0.5%cellulose ether,0.6%polypropylene fiber and1.5%redispersible polymer powdercan effectively improve the performance of vitrified microsphere insulation mortar,especially shear bonding strength increased by65%, meet the application of groundfloor insulation system. The measures add isolation joint, steel mesh and fiberglassmesh in concrete, can effectively reduce stress; Early conservation also has some effectin reducing stress. In the actual construction, Integrated use several measures ofmaterials, conservation and structures can reduced ground floor insulation systemprotective layer concrete28d stress to2.01Mpa and get a better optimization results.