Experimental study on fire resistance of cellular light weight concrete block of rice husk ash

Tarun Raj Singh, Kavita Tandon

Department of Civil Engineering, Harcourt Butler Technical University, Kanpur, India


  • The inclusion of RHA in CLC blocks enhances their fire resistance.
  • A 20% RHA replacement level shows optimal thermal and strength properties.
  • Compressive strength and density of blocks vary significantly with RHA content.
  • Elevated temperatures impact residual compressive strength of CLC blocks.
  • Utilizing RHA contributes to sustainable construction practices.


This present study investigates the impact of agricultural waste Rice Husk in the form of ash (RHA) on the fire resistance of Cellular Light weighted Concrete (CLC) blocks. In this study, a comprehensive experimental approach was employed, involving the production of 63 CLC blocks with varying RHA content (ranging from 0% to 30%). These blocks underwent a 28-day curing period before being subjected to elevated temperatures of 300°C and 500°C, respectively, for 2 hours in a muffle electric furnace. The results reveal a remarkable impact of RHA on the fire resistance of CLC blocks. Following exposure to 300°C, the average strength was reduced from 6.57% to 3.3%. Similarly, exposure to 500°C resulted in an average strength reduction between 16.82% and 12.93%. The study underscores the significance of RHA content in shaping the fire-resistant properties of CLC blocks, providing insights for the development of construction materials with enhanced thermal performance.

Keywords: CLC; Thermal conductivity; Rice husk ash; Foam Concrete; Compressive Strength

Scope: Civil Engineering

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