Macro–meso–micro experimental studies of calcined clay limestone cement (LC3) paste subjected to elevated temperature

By Runsheng Lin, Yi Han, Xiao-Yong Wang. Cement & Concrete Composites, 2021

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Abstract In this study, the macro properties (residual compressive strength), meso properties (mesoscopic images), and micro properties (reaction products and pore structures) of paste specimens with various limestone and calcined clay contents at elevated temperatures (20, 300, 550, and 900 °C) are experimentally investigated. According to the experimental results, (1) the strengths of all samples increase at 300 °C, while those of the LC3 ternary blended pastes increase more significantly because of the formation of katoite and the further hydration of binders. After the treatments at 550 and 900 °C, the reduction in the strengths of the LC3 samples is greater than that of the plain paste. (2) With further increasing temperature, all samples generate more meso cracks. (3) At 900 °C, a large gehlenite crystalline phase is formed in the samples with calcined clay. In summary, the microscopic explanation for the macroscopic and mesoscopic properties of LC3 paste at elevated temperature is investigated.

Subfields: Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/8e9b39afdb18d1a4b8b86f835ad1de539d452476