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标题：Workability and mechanical property of metakaolin phosphate acid based geopolymer
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作者：Teng Dong ; Ying Zhang ; Yixuan Jiang 等
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：267
期号：2
页码：1-6
DOI：10.1088/1755-1315/267/2/022002
出版社：IOP Publishing
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.