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《Concrete》 2005-11
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High reactivity metakaolin

LI Ke-liang,HUANG Guo-hong,WANG Dong,CHEN Jian,XU Hui(R&D High Technology CO.,Nanjing Hydraulic Research Institute,Nanjing 210024,Jiangsu,China)  
Metakaolin was prepared with kaolin by heat-treated technique that contained a great deal of amorphous SiO_2 and Al_2O_3.Affecting factors for the activity of metakaolin,burning temperature,burning time and contents of SiO_2 and Al_2O_3,were discussed through orthogonal tests.Activity index of Metakaolin was 114 that was larger by 11.8% than that of silica fume.Metakaolin with high pozzolanic activity,a new kind of mineral admixture,can be used to prepare high strength concrete.The compressive strength of MK concrete with water-cementitious materials ratio equal to 0.375 was 73.9 MPa which contained 10% MK.Geopolymer with amorphous to semi-crystalline structure was prepared with metakaolin activated by alkali activators.Its compressive strengths in early time were high reaching 55.8MPa cured at 60°Cfor 3 hours and 58.5 MPa cured at room temperature for 1 day.
【CateGory Index】: TU528.041
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