Autogenous Volume Deformation of Concrete due to MgO under the Temperature History of a Diversion Tunnel Concrete

Abstract:

Using MgO type expansive agent is considered as a convenient and effective method to reduce cracks in dam concrete, but the research on autogenous volume deformation of concrete with MgO type expansive agent under the temperature history of real structure is still unclear. In this paper, the temperature history of a diversion tunnel concrete was selected to discuss the autogenous volume deformation of concrete with different activities and dosages of MgO type expansive. The results showed that the autogenous volume expansion of concrete with MgO type expansive agent increased with the content and the activity of MgO type expansive agent. The expansion values of concrete with the content of 4%, 5% and 6% MgO type expansive agent are 51×10^-6, 85×10^-6 and 105×10^-6 in temperature rise stage, and 43×10^-6, 56×10^-6 and 71×10^-6 in temperature decrease stage. The expansion values of concrete with the activity 31s, 138s and 240s MgO type expansive agent are 36×10^-6, 51×10^-6 and 66×10^-6 in temperature rise stage, and 32×10^-6, 43×10^-6 and 62×10^-6 in temperature decrease stage. After 150d the autogenous volume deformation due to MgO type expansive agent did not increase any more.

• Periodical: Applied Mechanics and Materials (Volumes 357-360)
• Pages: 1399-1404
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.357-360.1399
• Online since: August 2013
• Authors: Fei Guo*, Jia Ping Liu, Qian Tian, Ting Yao, Shou Zhi Zhang
• Keywords: Autogenous Volume Deformation, MgO, Temperature History

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