Effect of Different Forms of CaO on the Properties of Cement-Based Materials Containing High Content of GGBFS

Abstract:

The effects of different forms of CaO on performances of cementitious binders containing 50 wt. % GGBFS powder are studied using compressive strength testing, hydration heat and X-ray diffraction measuring, microstructure measuring, and deformation testing. Results show that, the use of analytical-grade CaO or calcined CaO expansive clinker produces a higher mechanical strength than analytical-grade Ca (OH)₂ for mortar samples. The mortar containing analytical-grade CaO or calcined CaO expansive clinker shows a strength increase higher than the reference before 14 days of curing, but a litter lower than the reference after 28 days. With the increase of curing age, the diffraction peaks of Ca (OH)₂ gradually weaken, while those of C-S-H and hydrotalcite gradually increase, contributing to a gradual increase in strength of GGBFS pastes. Compared to analytical-grade CaO, the expansive process of calcined CaO expansive clinker matches better to the deformation history of mortar containing large content of GGBFS. This work is of great significance to explore the potential use of different forms of CaO as an alternative activator for GGBFS.

• Periodical: Applied Mechanics and Materials (Volumes 584-586)
• Pages: 1611-1617
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.584-586.1611
• Online since: July 2014
• Authors: Hua Li*, Jia Ping Liu, Qian Tian, Shou Zhi Zhang
• Keywords: Ca (OH)₂, Calcined CaO Expansive Clinker, CaO, GGBFS, Shrinkage, Strength, XRD

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