Workability and mechanical property of metakaolin phosphate acid based geopolymer

2019 3rd International Workshop on Renewable Energy and Development

能源学;生态环境科学

Dong, Teng^1 ; Zhang, Ying^2 ; Jiang, Yixuan^1 ; Zhao, Guodong^3 ; Yu, Xingyu^1

School of Civil Engineering, University of South China, Hengyang, Hunan

421001, China^1

School of Design and Art, University of South China, Hengyang, Hunan

421001, China^2

School of Resource and Environment and Safety Engineering, University of South China, Hengyang, Hengyang, Hunan Province

421001, China^3

关键词: Early strength;    Geopolymer;    Initial setting time;    Metakaolins;    Setting time;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/267/2/022002/pdf
DOI  :  10.1088/1755-1315/267/2/022002

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Metakaolin and different molarity of H3PO4 were used to synthesis metakaolin phosphate acid based geopolymer (PAG) at 45°C and humidity more than 98%. The fluidity of fresh PAG decreases from 15.2 mm to 13.1 mm according to the increasing molarity of H3PO4. Initial setting time and final setting time of fresh PAG increases from 21 h to 62 h and 35 h to 87 h with the molarity of H3PO4 increase from 6 mol/L to 12 mol/L respectively. PAG is an early strength material, and the highest strength of PAG is 120.7 MPa at 28 day and strength at 7day is up to 90.8 MPa. Porosity decreases and pore size increases with the increasing molarity of H3PO4, Pore size between 50 nm and 100 nm is dominated in PAG. Some cracks was observed in hardened PAG.