Mechanical and Thermal Properties of Lightweight Concrete Made from Expanded Glass
Lightweight concrete has become a popular construction material because of several advantages it holds over conventional concrete. Lightweight concrete is characterized by good compressive strength, durability and the most important advantages – low density and improved properties of thermal conductivity. Typical lightweight concrete aggregates are expanded clay or shale, natural porous materials like vermiculite or pumice. In this research, new type of lightweight aggregates was used, namely, expanded glass granules made from waste glass. Loose bulk density, water absorption, material density and material porosity were determined for the expanded glass granules. Microporosity of granules was observed and visual inspection of their microstructure was done by using scanning electron microscope (SEM).
The aim of the study was to identify a relation between mechanical and thermal properties of the lightweight concrete made from expanded glass aggregates. Six different concrete mixes with different amount of expanded glass granules and quartz sand were produced. Properties of fresh concrete like density and flow table test were tested. Flexural and compressive strength as well as density, water absorption and porosity were determined for 28 days old lightweight concrete samples. Thermal conductivity of lightweight concrete was determined and relation between thermal and mechanical properties was identified.
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