The Effect of Rice Husk Ash on Properties of Aerated Concrete

Abstract:

In this study, rice husk ash (RHA) was used as an aggregate with different replacement levels (0%, 25%, 50%. 75% and 100%) to produce aerated concrete under normal and high-pressure steam curing at 180°C for 8 h. The physical and mechanical properties and microstructure analysis were examined. Results showed that the unit weight and compressive strength reduced when RHA was introduced. Both curing conditions have no significant effect on the unit weight, but high-pressure steam curing resulting in higher compressive strength of aerated concrete. Scanning electron microscopy (SEM) analysis reveals that crystalline tobermorite was detected in aerated concrete with high-pressure stream curing, whereas fibrous-CSH was found in aerated concrete with normal curing. Moreover, aerated concrete under high-pressure steam curing with 75% and 100% RHA dosages meet the requirement of ASTM C1368 for AAC-6 and AAC-4, respectively.

• Periodical: Advanced Materials Research (Volume 747)
• Pages: 420-423
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.747.420
• Online since: August 2013
• Authors: Kittipong Kunchariyakun, Suwimol Asawapisit, Kwannate Sombatsompop
• Keywords: Aerated Concrete, Compressive Strength, Microstructure, Rice Husk Ash

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