Abstract
The main objective of this study is to create a lightweight aggregate concrete (LWAC) with a low thermal conductivity coefficient using expanded glass (EG) aggregate, produced from waste glass or crushed expanded polystyrene waste, obtained by crushing waste packing tare of household appliances. Research related to the effects of the amount of Portland cement (PC) as well as EG aggregates and crushed expanded polystyrene waste on physical (density, thermal conductivity coefficient, water absorption and capillary coefficient) and mechanical (compressive strength) properties of LWAC samples are provided. Insulating LWAC based on a small amount of PC and lightweight EG aggregates and crushed expanded polystyrene waste, with especially low thermal conductivity coefficient values (from 0.070 to 0.098 W/ (m·K)) has been developed. A strong relationship between thermal conductivity coefficient and density of LWAC samples was obtained. The density of LWAC samples depending on the amount of PC ranged between 225 and 335 kg/m3. A partial replacement of EG aggregate by crushed expanded polystyrene waste, results in relative density decrease of LWAC samples. In LWAC samples the increased amount of PC results in increased compressive strength.
Highlights
Lightweight aggregate concrete (LWAC) made from expanded glass (EG) aggregate is one of the latest types of concrete
In the LWAC samples where a part of EG aggregate is replaced by crushed expanded polystyrene waste, increased amount of Portland cement (PC), results in decreased water absorption, comparing with the LWAC samples with only EG aggregate
Insulating LWAC based on a small amount of PC and lightweight EG aggregate and crushed expanded polystyrene waste, with especially low thermal conductivity coefficient values (from 0.070 to 0.098 W/(m∙K)) has been developed
Summary
Lightweight aggregate concrete (LWAC) made from expanded glass (EG) aggregate is one of the latest types of concrete. The use of EG aggregates in concrete production as partial replacement to natural aggregates has caused a decrease in compressive strength compared to control mix. As described before (Khatib et al 2012), as the content of EG aggregates increases in the composition, the density value drops from 2328 kg/m3 for the control mix to 1401 kg/m3 for the concrete with 100% of EG aggregates and compressive strength value drops from 30.7 to 15.0 MPa. The studies indicate (Bumanis et al 2013) that with the increase of EG aggregates in the content from 300 to 400 kg/m3, the LWAC density decreased from 685 to 561 kg/m3, thermal conductivity coefficient – from 0.163 to 0.140 W/(m·K), compressive strength – from 5.8 to 4.1 MPa. The density of LWAC depends on the density and the amounts of the lightweight materials used. The weakest component of LWAC is not the cement matrix or the interfacial transition zone
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