Development of thermal-insulating high-performance geopolymer concrete containing rubber and PET powders with calcium oxide-activated materials

Document Type : Original Research

Authors
H. Bahmani 1
D. MOSTOFINEJAD 2
1 PhD, Department of Civil Engineering, Isfahan University of Technology (IUT), Isfahan,
2 Professor, Department of Civil Engineering, Isfahan University of Technology (IUT), Isfahan
10.22034/24.6.81
Abstract
Prior research has not explored the creation of concrete with superior thermal insulation properties using calcium oxide-activated materials. Furthermore, the impact of substituting large proportions of sand with worn rubber powder and PET on the mechanical and thermal characteristics of high-performance geopolymer concrete remains uninvestigated. This study addresses these gaps by examining the development of geopolymeric concrete with enhanced thermal insulation properties using calcium oxide-activated materials. A novel mixing method has been devised to improve the compaction of thermally insulating concrete, which includes calcium oxide-activated slag. For the purposes of this research, worn rubber powder and PET powder have replaced 10%, 20%, 30%, 40%, and 50% of the aggregates. The mechanical properties of the concrete were determined through compressive strength, four-point bending, and tensile strength tests. Lastly, the thermal conductivity coefficient was tested to ascertain the thermal properties of the developed concrete.

The findings revealed that in the developed concrete, substituting 10% of the aggregates with worn rubber powder or PET powder increased the energy absorption capacity of the concrete by 143% and 107%, respectively, while its mechanical properties decreased by 10% and 7%, respectively. Moreover, using 50% worn rubber powder and PET as aggregate substitutes reduced the samples’ thermal conductivity by 70% and 60%, respectively.

 

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Modares Civil Engineering journal
Volume 24, Issue 6
November and December 2024
Pages 81-92