Study on the Delayed Ettringite Formation in Massive Shrinkage Compensating Concrete with U-Type Expansive Agent

Abstract:

This paper introduces the research results of the thermal stability and the delayed formation of ettringite in China and abroad. Aiming at the debate of the ettringite delayed formation condition of the massive shrinkage compensating concrete in the engineering field, the decomposition and delayed formation of ettringite were studied in simulated environments in massive concrete and other controlled curing environment. As UEA is the most applied expansive agent in domestic, the massive shrinkage compensating concrete mixed with UEA is selected as the research object. The test results show that, AFM appears in the research specimens when the inner temperature reach 80°C and the ettringite can reform under the condition of rich water supply after the concrete cooling to an ambient temperature. By comparing the test results of different curing environment, some points for attention during the construction of the UEA massive shrinkage compensating concrete are proposed.

• Periodical: Key Engineering Materials (Volume 477)
• Pages: 340-347
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.477.340
• Online since: April 2011
• Authors: Qian Wang, Zheng Yue Ren, Zhe Zhang
• Keywords: AFM, Delayed Ettringite Formation AFT, Massive Shrinkage Compensation Concrete, UEA

References

[1] C.D. Lawrence: BCA, Lnterin Technical Note12(1990).

[2] P. Tepponen: Nordic Concrete. Vol. 6 (1987).

[3] Yan Peiyu, Qin Xiao: Concrete. Vol. 128 (2000), P. 18 (In Chinese).

[4] You Baokun, Xi Zhongyao: China Building Materials Science and Technology. Vol. 3 (2002), P. 13 (In Chinese).

[5] You Baokun, Li Guangmin, Han Lilin: Concrete. Vol. 139(2001), P. 7 (In Chinese).

[6] Yan Peiyu, Qin Xiao, Yang Wenyan: Journal of the Chinese Ceramic Society. Vol. 28 (2000), P. 319 (In Chinese).

[7] Brown P W, Bothe J V: Advanced Cement Research. Vol. 5 (1993), P. 47.

[8] Lawrence C D: Cement Concrete Research. Vol. 4(1995), P. 903.

[9] Yang R, Lawrence C D: Sharp H J. Delayed Ettringite Formation in 4-year old cement pastes. Cement Concrete Research. Vol. 10 (1996), P. 1649.

DOI: 10.1016/s0008-8846(96)00161-5

[10] Diamond S: Delayed Ettringite Formation Process and Problems. Cement Concrete Composite. Vol. 2(1996), P. 205-215.

DOI: 10.1016/0958-9465(96)00017-0

[11] Xue Jungan, Wu Zhongwei: Expansive and Self-stressing cement and its application (Chinese Architecture Industry Press, Beijing 1985). (In Chinese).

[12] Shi Yunxing, Wang Zeyun, Wu Dong: Concrete. Vol. 8 (2000), P. 52 (In Chinese).

[13] Li Naizhen, Liu Lanji: China Building Materials Science and Technology. Vol. 2 (1995), P. 16 (In Chinese).

[14] Yan Peiyu, Peng Jiang, Qin Xiao: Journal of the Chinese Ceramic Society. Vol. 4 (2001), P. 109 (In Chinese).

[15] Yan Peiyu, Qin Xial: Concrete. Vol. 8 (2000): 18 (In Chinese).

[16] Yan Peiyu, Peng Jiang. Concrete. Vol. 1 (2002), P. 17 (In Chinese).

[17] You Baokun: Expansive Concrete and its Application (China Building Material Industry Publishing House, Beijing 2002). (In Chinese).