Effect of transient creep on compressive strength of geopolymer concrete for elevated temperature exposure |
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Affiliation: | 1. Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia;2. Faculty of Engineering & Industrial Sciences, Swinburne University of Technology, Hawthorn, Victoria, Australia |
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Abstract: | The strength and transient creep of geopolymer and ordinary Portland cement (OPC)-based material (paste and concrete) were compared at elevated temperatures up to 550 °C. The strength properties were determined using an unstressed hot strength test and unstressed residual strength test for paste and concrete, respectively. At 550 °C, compared with the original strength, the strength of geopolymer was increased by 192% while the strength of OPC paste showed little change. However, after exposure to 550 °C, the residual strength percentage of both geopolymer and OPC concretes was similar. Transient creep data show that geopolymer had little change in transitional thermal creep (TTc) between 250 and 550 °C while OPC paste developed significant TTc in this temperature range. In comparison with OPC concrete, a higher strength loss of geopolymer concrete is thus believed to be due to the absence of TTc to accommodate nonuniform deformation during thermal exposure. |
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