The Crack of Harden Cement Paste Observed with Multi-technique  

作　　者：沈卫国 

机构地区：[1]Key Laboratory for Silicate Materials Science and Engineering of Ministry of Education,Wuhan University of Techoology [2]School of Materials Science and Engineering,Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2010年第6期1057-1060,共4页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Basic Research Program of China (No. 2009CB23201);the Open Foundation of National Key Laboratory of Green Building Materials(No.CBM-08-KFl 03);the Self-determined and Innovative Research Funds of WUT(2010-IV-066);the Foundamental Research Funds for the Central Universities

摘　　要：The shrinkage of the cement paste with low water-cement ratio at different relative humidity was observed and analyzed with ESEM and deformation map technique.The crack morphology was observed with different magnification with SEM and FESEM,and the formation of the crack was observed with AFM between two C-S-H nano particles.The observation by multi technique at multi scale indicated that the shrinkage was increase with the decrease of the humidity due to the increase of the pressure of the capillary pressure,the morphology of the crack in smaller scale was similar to that in the bigger scale,the smaller crack distributed in the latticework of the bigger ones,and the crack propagated along the gap between two nano particles of C-S-H with weaker bonding.The shrinkage of the cement paste with low water-cement ratio at different relative humidity was observed and analyzed with ESEM and deformation map technique.The crack morphology was observed with different magnification with SEM and FESEM,and the formation of the crack was observed with AFM between two C-S-H nano particles.The observation by multi technique at multi scale indicated that the shrinkage was increase with the decrease of the humidity due to the increase of the pressure of the capillary pressure,the morphology of the crack in smaller scale was similar to that in the bigger scale,the smaller crack distributed in the latticework of the bigger ones,and the crack propagated along the gap between two nano particles of C-S-H with weaker bonding.

关 键 词：CRACK cement paste SHRINKAGE muli technique MULTI-SCALE 

分 类 号：TU528[建筑科学—建筑技术科学]