Effects of Aluminum Concentrations on Microstructure and Compressive Strength of Porous Concrete

Abstract:

High porosity in porous concretes contributes to benefits in terms of lightweight, high water permeability, and superior insulation properties in the concretes. Nevertheless, excessive porosity can lead to diminished compressive strength. This study, therefore, aimed at fabricating porous concretes with porosity and compressive strength in the range suitable for practical applications. Since addition of aluminium powder is a well-known technique for porosity production, this study also assessed effects of aluminium addition on properties of porous concretes. Relationships among concentrations of aluminium, porosity, and compressive strength of the specimens were examined. Microstructural analysis from scanning electron microscope (SEM) images and compressive strength testing according to ASTM C109 revealed that the specimens with 0.15 wt% Al demonstrated porosity and compressive strength were in an acceptable range. Additionally, porosity production and specimen strengthening were discussed with respect to chemical compositions.

• Periodical: Key Engineering Materials (Volume 751)
• Pages: 563-569
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.751.563
• Online since: August 2017
• Authors: Oratai Jongprateep, Napamas Jaroonvechatam*, Supicha Stienkijumpai, Sicha Kaewsuwan, Thanawat Meesak
• Keywords: Air Entrainment Agent, Aluminium Powder, Compressive Strength, Porous Concretes

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