| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
|
|
|
|
|
| Effect of Sodium Chloride on Hydration of Calcium Aluminate Cement at Different Temperatures |
| WANG Zhongping1,2, YANG Haoyu1, ZHAO Yating1, XU Linglin1,2
|
1 School of Materials Science and Engineering, Tongji University, Shanghai 201804;
2 Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai 201804 |
|
|
|
|
Abstract Effects of NaCl on the hydration of calcium aluminate cement (CAC) at 5 ℃, 20 ℃ and 40 ℃ were analyzed by X-ray diffraction, scanning electron microscopy, mercury intrusion porosimetry and calorimetry. Results show that lower amount of NaCl accelerates the early hydration of CAC, while excessive NaCl delays the early hydration of CAC. Effects of NaCl on the hydration products of CAC are highly dependent on the curing temperature. At 5 ℃ and 20 ℃, the incorporation of NaCl greatly contributes to the formation of CAH10, thus the pore structure is optimized and compressive strength is enhanced significantly. At 40 ℃, the addition of NaCl accelerates the transition from metastable hydration products (CAH10, C2AH8) to C3AH6, leading to a significant increasing in the amounts of harmful pores in hardened cement paste and an obvious decrease in strength. Although the amount of bounded chloride ions increases with the increase of NaCl content, the trend of increasing gradually slows down. With the proceeding of hydration, the amount of bounded chloride ion increases at 5 ℃ and 20 ℃, while it decreases with age at 40 ℃.
|
|
Published: 20 June 2019
|
|
|
| Fund:This work was financially supported by the National Key Basic Research Program (2016YFB0303503) and the National Natural Science Foundation of China (51402216). |
| About author:: Linglin Xu, doctor of engineering, associate professor of Tongji University, master supervisor, graduated from the School of Materials Science and Engineering of Tongji University in 2013. In 2014, she was awarded the first batch of CSC-DAAD post-doctoral scholarship to undertake a one-year postdoctoral research at Bauhaus University Weimar, Germany.Wang Zhongping, doctor of engineering, professor of Tongji University, doctoral supervisor, graduated from Tongji University in 1984. He is a member of the Shanghai Institute of Ceramics and a member of the National Cement Standardization Technical Committee. The main research direction is high-performance cement-based materials, computer simulation of material structure systems and pore structure and properties of porous materials. |
|
|
1 Yuan Q, Shi C, Schutter G D, et al. Construction and Building Mate-rials, 2009, 23(1), 1.
2 Abate C, Scheetz B E. Journal of the American Ceramic Society, 2010, 78(4), 939.
3 Rapin J P, Renaudin G, Elkaim E, et al. Cement and Concrete Research, 2002, 32(4),513.
4 Sanjuan M A. Corrosion Science, 1998, 41(2), 335.
5 Sanjuan M A. Journal of Material Science, 1997, 32(23), 6207.
6 Ukrainczyk N. Advance in Cement Research, 2012, 2012(5), 249.
7 Goni S, Gaztanaga M T, Sagrera J L, et al. Journal of Material Research, 1994, 9(6), 1533.
8 Barrett P, Bertrandie D. Contributions to Mineralogy and Petrology, 2010, 169(4), 1.
9 Cong X, Kirkpatrick R J. Journal of the American Ceramic Society, 2010, 76(2), 409.
10 Pollmann H. Reviews in Mineralogy and Geochemistry, 2012, 74,1.
11 Pacewska B, Nowacka M. Journal of Thermal Analysis and Clorimetry, 2014, 117(2),653.
12 Damidot D, Rettel A, Capmas A. Advances in Cement Research, 1996, 8, 111.
13 Damidot D, Rettel A, Sorrentino D, et al. Advances in Cement Research, 1997, 9, 127.
14 Goni S, Andrade C, Page C L. Cement and Concrete Research, 1991, 21(4), 635.
15 Yang R, Liu B, Wu Z.Cement and Concrete Research, 1990, 20 (3), 385. |
| [1] |
YANG Jinxiang, SHI Shuang, JIANG Dachuan, LI Xu, LI Pengting, TAN Yi, YAO Yujie, CHI Ming, ZHANG Runde, ZHANG Jianshuai. Effect of Temperature on Solidification Rate During Directional Solidification of Multicrystaline Silicon[J]. Materials Reports, 2019, 33(z1): 28-32. |
|
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
2019, Vol. 33 
