Abstract
Light-weight aerated concrete (LAC) is produced by making LAC involves the addition of a gas-forming admixture like aluminium powder (AP) to a wet mortar mixture. In concrete during curing, AP will react with the calcium hydroxide in the mixture to form hydrogen. The amount of gas-forming is dependent on the mechanical properties requirements. The aim of the current work was to investigate the properties of aerated concrete (AC) containing 30% fly ash and various AP content, including dry density, porosity and modulus of elasticity, as well as strengths of test specimens. The results of this study showed that when AP content increased, the density of AC decreased, but its porosity increased. Whereas an increase in the amount of AP caused a decrease in both the compressive strength, tensile strength and the modulus of elasticity of ACspecimens. The investigation of newly modified AC through combination of local by-product in Vietnam would decrease the content of Portland cement was used and as well as reduce the amounts of ash and slag TPP as well as industrial waste thrown at a landfill. Therefore, assisting the thermoelectric power plants to be more environmentally friendly in the future.
Highlights
Vietnam is one of the large thermoelectric power producers, has been generating many agroindustrial waste materials like fly ash (FA), slag and bottom ash from the thermoelectric power plants (TPP)
Because the main objective of present investigation was to study the influences of aluminium powder amount on properties of light-weight aerated concrete containing 30% mass of fly ash, which is intended for precast lightweight concrete panels for new construction of the High-Rise buildings
2.3.1 Density and porosity of the aerated concrete The average dry density of the AC-sample was identified according to standard BS EN 992 [21], while the porosity of the AC was determined by water soaking methods [22, 23]
Summary
Vietnam is one of the large thermoelectric power producers, has been generating many agroindustrial waste materials like fly ash (FA), slag and bottom ash from the thermoelectric power plants (TPP). 2016, only TPP "Vung Ang" was produced about 3 thousand tons of fly and bottom ash and slag materials on the daily. The introduction of a gas-forming material from aluminium powder (AP) reacts with the Ca(OH) formed on the hydration of Portland cement to obtained hydrogen gas and a final result to produce the large pores structure of the concrete. Because the main objective of present investigation was to study the influences of aluminium powder amount on properties of light-weight aerated concrete containing 30% mass of fly ash, which is intended for precast lightweight concrete panels for new construction of the High-Rise buildings
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