NONCONVENTIONAL NEW GENERATION OF ENVIRONMENTAL FRIENDLY AND ECONOMIC BUILDING MATERIALS: AERATED CONCRETE

  • Bogdan Valentin Paunescu Consitrans SA Bucharest
  • Eniko Volceanov Metallurgical Research Institute SA Bucharest
  • Lucian Paunescu Cosfel Actual SRL Bucharest
Keywords: aerated concrete, aluminium powder, aqueous solution, calcined gypsum, steam curing

Abstract

Experimentally, fine porosity-aerated concrete was made using the technique of corrosion the aluminum powder as a foaming agent in Ca(OH)2 solution. The powder (below 10 μm) was obtained from recycled waste, melted by microwave irradiation and atomized by the contact with gaseous nitrogen jets in an original facility designed by authors. The making recipe of concrete is based on calcined gypsum as the main binding agent substituting the pollutant and non-economic cement, fly ash from industrial coal burning, perlite, silica fume, hydrated lime and distilled water. Aerated concrete with excellent thermal insulation properties (density of 601 kg/m3, heat conductivity of 0.114 W/mK, and porosity of 75.2 %) was obtained. The compression strength was increased to 3.9 MPa by curing process with 0.3 bars-steam and 75 ºC for 4 hours and holding further 8 hours inside a sealed room heated to 80 ºC. The product belongs to the new generation of building materials made without CO2 emission and with low energy consumption.

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Published
2023-03-31
How to Cite
Paunescu, B., Volceanov, E., & Paunescu, L. (2023). NONCONVENTIONAL NEW GENERATION OF ENVIRONMENTAL FRIENDLY AND ECONOMIC BUILDING MATERIALS: AERATED CONCRETE. Nonconventional Technologies Review, 27(1). Retrieved from http://revtn.ro/index.php/revtn/article/view/403

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