Study on the Secondary Interface in Microstructure of the Superfine Sand Concrete

Abstract:

The superfine sand concrete application in our country has a history of more than half a century. Although we have a certain understanding about the superfine sand concrete, there are few studies of superfine sand concrete interface. This experiment made up different water-cement ratio superfine sand concrete, and used scanning electron microscope to observe the secondary interface structure, the product of interface C-S-H gel had been carried on by the energy spectrum analysis. Results show that the secondary interface microstructure of the low water-cement ratio concrete is denser than high water cement ratio, and also have certain effects on macroscopic compressive strength; C-S-H gel calcium silicon ratio in the secondary interface is between 1.5 and 2.1.

• Periodical: Applied Mechanics and Materials (Volume 529)
• Pages: 112-116
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.529.112
• Online since: June 2014
• Authors: Yong Ning Mi, Xin Shao, Jin Ting Zhao, Zhen Guo Wang, Chuan Yue
• Keywords: Calcium Silicon Ratio, Concrete, Secondary Interface, SEM, Superfine Sand

References

[1] Qi Feng , Hengjing Ba, Guangming Liu: Effect of secondary interface microstructure on pore structure and performance of cement-based materials [J]. Journal of materials research, 2003 (5) : 489-494. In chinese.

[2] D. Manmohan, P.K. Mehta: Cement and Conerete Researeh, 11, 507(1981).

[3] Qi Feng , Hengjing Ba, Zhengyu Fan , Yingzi Yang , Xiaojian Gao . Study on interfacial microstructure of superfine powders reinforced cement based composites at early age[J]. Journal of composite materials, 2003, 20 (4) : 72-76. In chinese.

[4] Yongning Mi , Ying Zhang , Shuwei Zhang , Yuqing Zhang . Research on the super- fine sand's fractal characteristics of Liao River and corresponding concrete property [J]. Concrete, 2012, (10) : 51-54. In chinese.

[5] The construction of the People's Republic of China on schedule. BJGl9-65. The preparation and application of the superfine sand concrete rules, 1965. In chinese.

[6] Xiang Li. Hydration performance and microstructural stability of complex cementitious material[D]. Beijing: Tsinghua university civil engineering, 2010: 70-82. In chinese.

[7] Sidney Mindess, J. Francis Young, David Darwin. Wu Keru et al. Concrete [M]. In January 2005 the first edition. Beijing: chemical industry press, 2004. 8: 73-77.