Preparation, Properties, Formation Mechanism of Autoclaved Bricks from Waste Foundry Sand

Abstract:

Preparation, properties of autoclaved bricks from waste foundry sand and their strength formation mechanism were investigated in this article. Autoclaved bricks were prepared using waste foundry sand, crashed stone, fly ash, activators such as slaked lime, and special composite as starting materials, accompanying preparation process of wheel-rolling blending, molding with high pressure, and autoclaved curing process. Prepared autoclaved bricks have been authoritatively tested. The results show that strength reaches the standard of 15C, radium activity concentrations are lower than the limit in main building materials, coefficient of carbonization and data of drying shrinkage can be in consistent with Chinese fly ash brick standard. Leaching toxicity is lower than the standard. The strength formation mechanism was investigated by XRD and SEM techniques. The results show that under the conditions of high-temperature, high-pressure steam a mesh structure will be generated and assembly connected, thus forming the strength of autoclaved bricks.

• Periodical: Applied Mechanics and Materials (Volumes 174-177)
• Pages: 697-700
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.174-177.697
• Online since: May 2012
• Authors: Ying Zheng
• Keywords: Autoclaved Bricks, Formation Mechanism, Preparation, Property Analysis, Waste Foundry Sand

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