Study On The Fire Performance Of Inorganic Lightweight Aggregates Insulation Mortar

The burning behavior and fire resistance of insulation system materials forbuilding resistance against the building fires or to prevent the spread of the fire oftheir construction are very important. In recent years, building fires caused by theorganic insulation materials occurred frequently all over the country. Inorganiclightweight aggregate insulation mortar, especially the new inorganic thermalinsulation mortar represented by the thermal insulating mortar mixed with expandedand vitrified beads, is gradually becoming the new development direction of theinsulation materials with its excellent fire performance and thermal insulationperformance.Inorganic lightweight aggregate insulation mortar is mainly composed ofinorganic lightweight aggregate,cementitious materials, polypropylene fiber, additives,modified components etc.This article,referencing to the existing laboratory formulations,researched the fire insulation properties of inorganic lightweight aggregateeffected by aggregate quantity,the amount of cement, vesicant content and compositeadditives;With the help of Finite Element Software ANSYS,the article calculates thetemperature field of reinforced concrete column and analysis the the reinforcedconcrete structure temperature effected by glazed hollow bead insulation mortarlayer.The test results show that thermal insulating mortar mixed with expanded andvitrified beads has good fire performance and heat insulation properties; Variousfactors influence the high temperature thermal insulation properties of inorganiclightweight aggregate insulation mortar order was aggregate quantityâ†'the amount ofcementâ†'vesicant contentâ†'composite additives; The thermal insulation mortar getthe best fire insulation performance and low thermal conductivity when all factorswere selected respectively120kg/m~3,90kg/m~3,4%and II;Internal structure, moistureand thermal conductivity of Insulation mortar are the main Influence factors oninsulation mortar, thermal the moisture content the greatest impact on test temperaturecurve （fire resistance） when the temperature is below100°C. By comparison withmaterials such as concrete,glass beads insulation mortar has excellent hightemperature crack resistance due to the special nature of the insulation aggregateinternal structure. The results calculated by ANSYS show that the reinforced concrete column,which protected by insulation mortar layer, has lower section temperature fieldeffected by the standard heating curve ISO834. Reinforced concrete column, with25mm thick glass beads of insulation mortar layer, surface temperature is below350°C after2hours in a fire disaster，and the mechanical properties of material isguaranteed effectively. Column cross section temperature distribution in the thermalinsulation mortar and concrete layer interface appears obvious inflection point; Andthe insulation mortar layer is thicker or the thermal insulation mortar conductivity issmaller, the component section temperature is lower in the same fire time.Therefore, the test and calculation results show that it is feasibe to consideratethe fireproof activity of inorganic lightweight aggregate insulation mortar while doingfire resistane design structure with inorganic thermal insulation mortar, especially theinternal insulation structure， if the quality of inorganic lightweight aggregateinsulation mortar system is reliability.