Abstract
One of the growing concerns in the construction industry is energy consumption and energy efficiency in residential buildings. Moreover, management of non-degradable solid glass wastes is becoming a critical issue worldwide. Accordingly, incorporation of recycled expanded glass aggregates (EGA) as a substitution for natural fine aggregate in cement composites would be a sustainable solution in terms of energy consumption in the buildings and waste management. This experimental research aims to investigate the effects of EGA on fresh and hardened properties and thermal insulating performance of cement mortar. To enhance the mechanical properties and water resistance of the EGA-mortar, nano titanium dioxide (nTiO2) was used as nanofillers. The results showed an increase in workability and water absorption of the EGA-mortar. In addition, a significant decrease in bulk density and compressive strength observed by incorporating EGA into the cement mortar. The EGA-mortar exhibited a low heat transfer rate and excellent thermal insulation property. Furthermore, inclusion of nTiO2 increased compressive strength and water resistance of EGA-mortar, however, their heat transfer rate was increased. The results demonstrated that EGA-mortar can be integrated into the building envelop or non-load bearing elements such as wall partition as a thermal resistance to reduce the energy consumption in residential buildings.
Highlights
In the last few decades, demand for energy consumption in the residential building has risen and there is a high intention for reducing energy consumption in the buildings
expanded glass aggregates (EGA) into the mortar composite causing a significant decrease in density and compressive strength, which was attributed to the porous nature and low compressive strength of EGA
The results demonstrated that as the EGA content increased, the workability and water absorption of cement composite increased
Summary
In the last few decades, demand for energy consumption in the residential building has risen and there is a high intention for reducing energy consumption in the buildings. The energy efficiency of the buildings has become increasingly critical with the rising costs of energy as well as increasing awareness on global warming effects [1,2]. In Australia, about 1.1 Mt of glass waste was generated in the year of 2016–2017 from that 43% was stockpiled. Use of waste glass in the large scale is a sustainable solution in terms of reduction of carbon footprint and saving the costs and energy. The construction industry is a potential sector for utilization of waste glass. In this regard, use of solid wastes for manufacturing the building materials with high thermal insulation properties is an effective approach toward sustainable
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