| Objective To study the performance optimization of mortar at a SiO2 aerogel particles volume replacement ratio of 30% , in order to improve the thermal insulation performance and environmental adaptability. Methods With the method of orthogonal experiment, fiber, air-entraining agent and powder were added into the mortar to improve the insulation performance, and the density, mechanical properties, water absorption, especially the thermal conductivity of mortar were compared to study the influence of different doping ratio. Results When the dosages of fiber, air-entraining agent and powder were 0.2%, 0.05% and 1% respectively, the thermal conductivity was the lowest (0.3177 W/m·K). At this time, the density of mortar was 1751.6 kg/m3, the compressive strength and flexural strength were 13.4 MPa and 8.02 MPa, the water absorption was 7.19%, and the thermal conductivity was 0.3177 W/m·K. Conclusion By adding fiber, air-entraining agent and powder, the performance of mortar was improved to a certain degree, its density changed within a smaller range, the flexural strength largely increased, and the thermal conductivity reduced within a certain range. |