Behavior of combined fly ash/GBFS-based geopolymer concrete after exposed to elevated temperature

2019 3rd International Workshop on Renewable Energy and Development

能源学;生态环境科学

Junru, Ren^1 ; Huiguo, Chen^1 ; Ruixi, Dai^1 ; Tao, Sun^1

Dept. of Military Installations, Army Logistical University of PLA, Chongqing

401311, China^1

关键词: After high temperature;    Cementitious materials;    Elevated temperature;    Geopolymer concrete;    Granulated blast-furnace slags;    Mechanical performance;    Ordinary Portland cement;    Residual compressive strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/267/3/032056/pdf
DOI  :  10.1088/1755-1315/267/3/032056

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Geopolymer is an emerging cementitious material characterized by better mechanical performance and more environmentally sustainable properties than ordinary Portland cement (OPC). Previous work mainly highlighted thermal behavior of metakaolin or fly ash-based geopolymers. This paper provides experimental data of geopolymer concrete manufactured with granulated blast furnace slag (GBFS) and fly ash after high temperature exposures of 400°C, 600°C, 800°C and 1 000°C in terms of ISO834. Residual compressive strength and splitting strength, as well as the effects of standing time were examined and compared with equivalent OPC concrete findings. The results revealed that both kinds of strength improved about 14% and 9% after being exposed to 400°C, and the reduction was less than OPC concrete. Additionally, the residual compressive strength after different exposures evolved variously with prolonging of standing time. On the basis of the results, the empirical equations of residual compressive strength and splitting strength of GC are established.