Abstract
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.
Highlights
Insulation mortar is a kind of building material for the surface of buildings, with cement as cementitious material, lightweight material as aggregate, and some modifiers and additives, which is formed by mixing and stirring
Because of good thermal insulation performance and workability, insulation mortar has been widely used in practical engineering[1]
Known as the lightest solid material and one of the best thermal insulation material, of which more than 90% volume is composed of tiny pores, possesses high porosity, high specific surface area, ultra-low density and extremely low thermal conductivity[4]
Summary
Insulation mortar is a kind of building material for the surface of buildings, with cement as cementitious material, lightweight material as aggregate, and some modifiers and additives, which is formed by mixing and stirring. As the common thermal insulation lightweight aggregate, play an important role on the market, of which the spherical surface can improve the workability and reduce the dosage of water, and at the same time the internal porous structure can strength insulation performance and enhance particle strength[2]. Aerogel-glazed hollow beads composite aggregate form suitable particle gradation because of the particle size range of aerogel, which can reduce porosity of composite aggregate and increase compressive strength and flexural strength of mortar, and can reduce the amount of cementitious materials needed for wrapping the lightweight aggregate, further cutting down the dry density of mortar[5]. The effect of different amount of silica aerogel instead of glass hollow beads on the physical and mechanical properties, thermal insulation properties and fire-resistance properties was studied by adding composite aggregate directly into mortar
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