Development of expander agent based on aluminum slag for the production of autoclaved or molded cellular concretes in loco

• Grant number: 01/03059-9
• Support Opportunities: Research Grants - Innovative Research in Small Business - PIPE
• Start date: September 01, 2001
• End date: June 30, 2004
• Field of knowledge: Engineering - Civil Engineering - Construction Industry
• Principal Investigator: Edval Goncalves de Araujo
• Grantee: Edval Goncalves de Araujo
• Company: Siporex Concreto Celular Ltda

Abstract

Secondary slag from the production of aluminum contains, in addition to oxides, salts and other compounds, around 3 to 5 per cent of metallic aluminum. After processing the slag, the removal of the salts takes place and a powder is obtained with a granulometry below 150 micrometers. The resulting material contains aluminum metal finely spread and homogeneously dispersed. When exposed to the alkaline medium, it releases hydrogen and can be used in the production of cellular concrete. The experiments in this project aim to determine the properties of autoclaved cellular concrete with the addition of slag as a gas forming agent (apparent dry density – NBR 13440 – and resistance to compression – NBR 13439), maintaining the same industrial conditions of the processing. Concrete not autoclaved with slag, will be tested for the action of stabilizers and tensoactives on the resistance to compression of concretes with a density of 800 to 1600 kg/m3 (NBR 5739). Thus, this project is based on the reuse of a highly polluting industrial waste in the production of cellular concrete. In financial terms, this technique represents a viable alternative for the replacement of common expanders (aluminum powder or foaming agents), decreasing in up to 10 per cent the cost of raw material used in the manufacture of these two types of concrete. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

SHINZATO‚ MC; HYPOLITO‚ R.. Solid waste from aluminum recycling process: characterization and reuse of its economically valuable constituents. WASTE MANAGEMENT, v. 25, n. 1, p. 37-46, 2005. (01/03059-9)

Filed patent(s) as a result of this research project