Effect of transient creep on compressive strength of geopolymer concrete for elevated temperature exposure

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• 作者：Zhu Pan ; Jay G. Sanjayan ; Frank Collins
• 关键词：Temperature (A) ; Compressive Strength (C) ; Creep (C) ; Alkali Activated Cement (D) ; Transient
• 刊名：Cement and Concrete Research
• 出版年：February, 2014
• 年：2014
• 卷：56
• 期：Complete
• 页码：182-189
• 全文大小：993 K

文摘

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 掳C. The strength properties were determined using an unstressed hot strength test and unstressed residual strength test for paste and concrete, respectively. At 550 掳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 掳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 掳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.