Preprint Article Version 1 This version is not peer-reviewed

Microscopic Change in Hardened Cement Paste Due to High-Speed Impact

Version 1 : Received: 4 December 2018 / Approved: 6 December 2018 / Online: 6 December 2018 (05:24:33 CET)

How to cite: Sakai, Y.; Sikombe, I.; Watanabe, K.; Inoue, H. Microscopic Change in Hardened Cement Paste Due to High-Speed Impact. Preprints 2018, 2018120074 Sakai, Y.; Sikombe, I.; Watanabe, K.; Inoue, H. Microscopic Change in Hardened Cement Paste Due to High-Speed Impact. Preprints 2018, 2018120074

Abstract

Impact load was applied to hardened cement paste (HCP) specimens using a gas gun to investigate microscopic changes in the specimens and develop a better response model of concrete subjected to impact load. Plasma emission was observed at the moment of impact at 420 m/s and the colour of the portion near the impact point turned brighter. This brighter portion was analysed, and it was observed that the pore structure was coarser compared to the other portion; however, the results of thermogravimetry and X-ray diffraction analysis were similar. A possible reason is that the generated heat was instantaneous and the rate of the temperature increase in the HCP decreased due to evaporation of water in the HCP. These results indicate that during impact at a few hundred m/s, porosity increase due to heat effect is more dominant than porosity decrease due to mechanical compaction.

Subject Areas

cement paste; impact test; pore structure; thermograveimetry analysis; X-ray differential analysis

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