Air Content of Cellular Lightweight Concrete
Keywords:
cellular lightweight concrete,, foam concrete,, air content,, porosity,, specific gravityAbstract
This paper presents the determination of air content in cellular lightweight concrete using 3 methods: (1) Air Void Analyser, (2) calculation based on mix proportions and (3) porosity estimation using ASTM C128 for the determination of concrete specific gravity. Cellular lightweight concretes with unit weight between 800 kg/m3 to 1800 kg/m3 using water to cement ratios of 0.45 and 0.55 and sand to cement ratios of 0.25:1, 0.5:1, 1:1, 2:1 and 3:1 in total of 26 designed mixes are produced. The air contents obtained using methods (1), (2) and (3) found in between 13.3 and 53.8 %, from 39.4 to 78.7 % and from 36.7 to 73.1%, respectively. The volume of cement and sand (solid content) found in between 19.8 and 59 percent of concrete volume. From the study, this may be concluded that in practice determination of porosity and concrete specific gravity based on ASTM C128 may be used, and solid content may be used to study the correlation of cellular lightweight concrete properties.
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