The Crack of Harden Cement Paste Observed with Multi-technique

• Published in: Journal of Wuhan University of Technology. Materials science edition 2010-12, Vol.25 (6), p.1057-1060
• Main Authors: Shen, Weiguo, Gan, Gejin, Zhang, Wensheng, Dong, Rui, Ye, Jiayuan, Zhou, Mingkai
• Format: Article
• Language: English
• Subjects: Cement; Chemistry and Materials Science; FESEM; Materials Science; 扫描电镜分析; 显微镜观察; 毛管压力; 相对湿度; 硬化水泥浆体; 裂纹分布
• ISSN: 1000-2413; 1993-0437
• DOI: 10.1007/s11595-010-0149-1

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.