Experimental study on influence of aggregate gradation on properties of silica aerogel-glazed hollow beads composite insulation mortar

Taking the defects of narrow range of particle gradation of glazed hollow beads and low mechanical strength of silica aerogel into consideration, silica aerogel and glazed hollow bead have been mixed for the composite aggregate of insulation mortar. Some measures, such as composite aggregate and particle gradation, were taken to optimize the properties of aggregate formulation, analyzing kinds of factors that influence on the properties of the mortar thoroughly, such as mechanical properties, thermal insulation properties and fire-resistance properties. Under the condition of 60vol% aggregate content, it was found that compositing 35vol% silica aerogel and 65vol% glazed hollow beads as the composite aggregate was optimum for producing insulation mortar samples with suitable properties