Deformation and mechanical properties of quaternary blended cements containing ground granulated blastfurnace slag, fly ash and magnesia
Lau, Wai Yuk
Cement and Concrete Research
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Mo, L., Liu, M., Al-Tabbaa, A., Deng, M., & Lau, W. Y. (2015). Deformation and mechanical properties of quaternary blended cements containing ground granulated blastfurnace slag, fly ash and magnesia. Cement and Concrete Research, 71 7-13. https://doi.org/10.1016/j.cemconres.2015.01.018
Shrinkages of cementitious materials may lead to cracking under restrained conditions. This study was motivated to develop non-shrinkage quaternary blended cements through blending slag and fly ash with Portland cement containing reactive MgO. The hydration process, autogenous shrinkage at early age, long-term volume deformation, mechanical properties, and microstructure of cement specimens were investigated. Results showed that the autogenous shrinkage of the cement pastes was effectively mitigated due to the compensation of the MgO present and the reduction of cement content owing to the partial replacements with slag and fly ash. The mechanical strengths of the blended cement mortars were lower than that of the corresponding plain Portland cement mortars at early age of 3 d, but increased significantly to be similar or higher at late ages of 28 d and 90 d. This is attributed to the microstructure densification and the interface microstructure enhancement due to the reaction of SCMs with clinker phases.
Calorimetry, Microstructure, Mechanical properties, Shrinkage, Blended cement
The financial support from the Royal Academy of Engineering UK/China Exchange (12/13RECI013), the National Key Technology R&D Program (2011BAE27B01-1), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the National Natural Science Foundation of China (51461135003) is acknowledged.
External DOI: https://doi.org/10.1016/j.cemconres.2015.01.018
This record's URL: https://www.repository.cam.ac.uk/handle/1810/247403