Effects of air void characteristics on compressive strength of cellular lightweight concrete
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Abstract
Cellular lightweight concrete is produced by uniform distribution of air bubbles made from preformed foam throughout the mass of concrete in substitution of coarse aggregates. The properties of cellular lightweight concrete are depended on density or foam volume, when the concrete hardens was to become pore system inside. That, it is a very
significant characteristic affects to strength, durability and thermal conductivity. This paper presents the effect of foaming agent types to air void size of cellular lightweight concrete with a wet density of 1,800 kg/m3 using sand to cement ratios
of 2:1 and water to cement ratios of 0.65. At this density, the concrete specimens were used three types of foaming agent and used three different foaming agents to water ratios of 1:20, 1:30 and 1:40. To producing preformed foam by foam
generator used pressure at 4.5, 5.0, and 5.5 kg/cm2 and the concrete specimens were used air dry curing method for 28 days. It was found that when porosity was increased, the air void size at D90 and air void size distribution ranges were increased resulting in a decrease of compressive strength. SPAN (Sp) was used to identify the difference in air void.
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References
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