Shrinkage and Cracking Behavior of Cement Based Materials Containing Undercalcined MgO-Based Expansive Agent

Shou Zhi Zhang; Qian Tian; Ting Yao; Fei Guo

doi:10.4028/www.scientific.net/AMM.357-360.1148

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 357-360Shrinkage and Cracking Behavior of Cement Based...

Shrinkage and Cracking Behavior of Cement Based Materials Containing Undercalcined MgO-Based Expansive Agent

Abstract:

This paper gives a comprehensive investigation on the effects of undercalcined MgO-based expansive agent (UMEA) on the shrinkage and associated cracking behavior of cement based materials, including length change under drying condition and restrained condition, and cracking under single-ring restraint. Experimental results showed that the UMEA could reduce the drying shrinkage as well as restrained shrinkage of cement based materials effectively. The measured shrinkage reduction was up to 55.3% at the age of 180d of drying. It was also found that the addition of shrinkage could effectively improve the shrinkage cracking resistance of cement based materials even under drying condition. The experimental results of autoclaving testing showed that the UMEA has a larger dosage of stability. If the dosage in cement is controlled according to the requirement of concrete construction, the UMEA can be used to compensate the shrinkage as designed.

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Periodical:

Applied Mechanics and Materials (Volumes 357-360)

Pages:

1148-1153

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.357-360.1148

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Online since:

August 2013

Authors:

Shou Zhi Zhang, Qian Tian, Ting Yao, Fei Guo

Keywords:

Autoclaving Soundness, Drying Shrinkage, Ring Cracking, Undercalcined MgO-Based Expansive Agent

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