Utilization of waste ceramics for high-performance thermal insulation materials with optimized compressive strength
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One of the biggest components of construction and demolition waste is brick waste, which poses serious disposal andenvironmental issues. Porous thermal insulation materials with optimal compressive strength were created in this studyusing recycled brick and ceramic waste. To customize porosity and microstructure, leftover bricks were ground into powders,treated with pore-forming agents, and then sintered at 900–1200 °C. At porosity levels of 45–60%, the resultant materialsdemonstrated thermal conductivities as low as 0.28–0.36 W/m·K, demonstrating their efficacy as insulating materials. Compressive strengths between 3 and 7 MPa were maintained in spite of the increased porosity, guaranteeing adequatestructural integrity for handling and installation in building settings. The original crystalline alumino-silicate phases of thebrick added to its mechanical strength, while interconnected pores found by microstructural analysis provided thermalresistance. The superior mechanical stability and competitive thermal performance of the recycled brick ceramics whencompared to traditional insulation foams supported their use in environmentally friendly building. The results show that itis feasible to turn brick waste into high-performance insulation products, supporting circular economy and energy efficiencyinitiatives.
Abstract
One of the biggest components of construction and demolition waste is brick waste, which poses serious disposal andenvironmental issues. Porous thermal insulation materials with optimal compressive strength were created in this studyusing recycled brick and ceramic waste. To customize porosity and microstructure, leftover bricks were ground into powders,treated with pore-forming agents, and then sintered at 900–1200 °C. At porosity levels of 45–60%, the resultant materialsdemonstrated thermal conductivities as low as 0.28–0.36 W/m·K, demonstrating their efficacy as insulating materials. Compressive strengths between 3 and 7 MPa were maintained in spite of the increased porosity, guaranteeing adequatestructural integrity for handling and installation in building settings. The original crystalline alumino-silicate phases of thebrick added to its mechanical strength, while interconnected pores found by microstructural analysis provided thermalresistance. The superior mechanical stability and competitive thermal performance of the recycled brick ceramics whencompared to traditional insulation foams supported their use in environmentally friendly building. The results show that itis feasible to turn brick waste into high-performance insulation products, supporting circular economy and energy efficiencyinitiatives.