Research On Properties Of Slag-based Fiber Reinforced Thermal Insulation Mortar

The performance optimization of inorganic thermal insulation mortar is an important development direction of green building materials.Part of the waste incinerator slag is used to replace the light aggregate,and the prepared thermal insulation aggregate and reinforcing fiber are mixed into the mortar to prepare the slag-based thermal insulation mortar.The SiO₂ aerogel prepared by rice hull ash is used to optimize the thermal conductivity test,and the slag-based fiber reinforced thermal insulation mortar has the property of heat insulation and light weight.The purpose of this paper’s experimental research is to develop thermal insulation mortar using domestic waste incinerator slag.The reasonable ratio of thermal insulation mortar was determined by orthogonal test design and thermal conductivity optimization test.Numerical analysis was carried out to simulate the temperature field distribution and heat flux density of the structural layer of the thermal insulation system.1.Refer to JGJ70-2009 Basic Performance Test Method of Building Mortar"to prepare mortar specimens.The orthogonal experimental design method was adopted.The thermal conductivity,dry apparent density,compressive strength,flexural strength and shrinkage rate were taken as the evaluation indexes.The content of waste incinerator slag,glass fiber,vitrified microspheres,redispersible latex powder and water-binder ratio were taken as the influencing factors to carry out range analysis,and the order of influencing factors for evaluation indexes was obtained.The results show that the lowest thermal conductivity of mortar is 0.069W/（m.K）when the scheme A₄B₄C₄D₂E₁ is adopted,and the lowest apparent dry density is 323kg/mm³ when the scheme A₄B₃C₃D₄E₂ is adopted.2.The test used the recycled rice husk ash as raw material,SiO₂ aerogel with slag based fiber reinforced thermal insulation mortar was prepared by sol-gel method.The pH value of silicic acid solution was adjusted during the process of SiO₂ aerogel condensation,and the pH value of SiO2 aerogel under suitable gel condition was4.5⁵.0.The number of anhydrous ethanol changed during the solvent replacement process.When the number of anhydrous ethanol replacement times was less than 5times,the rate of SiO₂ aerogel density decreased slowly,and the surface area of SiO₂aerogels increased when the absolute ethanol replacement time was higher than 3times.3.The test carried out the gradation treatment experiment of slag based fiber reinforced thermal insulation mortar,fill the excess pores in the thermal insulation mortar with a larger surface area SiO₂ aerogel,and reduce the friction between the thermal insulation mortar aggregates.The correlation between thermal conductivity and dry apparent density of slag based fiber reinforced thermal insulation mortar after grading SiO₂ aerogel was analyzed.The thermal insulation properties of slag based fiber reinforced mortar were tested under different temperature and humidity conditions,and the mechanism of environmental impact on heat conduction was analyzed.4.The data analysis used the finite element analysis theory of heat conduction and ANSYS Workbench,the steady-state thermal conductivity of the structure layer of the slag-based fiber reinforced thermal insulation mortar thermal insulation system is numerically analyzed,and the temperature field changes of each structure layer and the heat flux of the thermal insulation system under the simulation constraints are obtained.When using slag-based fiber reinforced thermal insulation mortar as thermal insulation structure layer,the change of temperature gradient concentrates on thermal insulation mortar structure layer,and the heat of thermal insulation layer is greatly weakened,so the thermal insulation effect is improved.Figure[42]table[24]reference[48]...