scholarly journals Microscopic Change in Hardened Cement Paste due to High-Speed Impact

2019 ◽  
Vol 17 (9) ◽  
pp. 518-525
Author(s):  
Yuya Sakai ◽  
Ivwananji Sikombe ◽  
Keiko Watanabe ◽  
Hiroyuki Inoue
Keyword(s):  
Cement Paste ◽  
High Speed ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
High Speed Impact ◽  
Microscopic Change

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

2018 ◽  
Author(s):  
Yuya Sakai ◽  
Ivwananji Sikombe ◽  
Keiko Watanabe ◽  
Hiroyuki Inoue
Keyword(s):  
Cement Paste ◽  
High Speed ◽  
Impact Load ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
High Speed Impact ◽  
Gas Gun ◽  
Microscopic Change ◽  
The Moment ◽  
The Impact

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.

scholarly journals PROPERTY CHANGE OF HARDENED CEMENT PASTE BY HIGH-SPEED IMPACT

2019 ◽  
Vol 72 (1) ◽  
pp. 77-82
Author(s):  
Yuya SAKAI ◽  
Ivwananji SIKOMBE ◽  
Keiko WATANABE
Keyword(s):  
Cement Paste ◽  
High Speed ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Property Change ◽  
High Speed Impact

An Investigation Of A High Speed Shear Mixer On Selected Pastes And Mortars

1988 ◽  
Vol 137 ◽  
Author(s):  
M. L. Brown ◽  
W. B. Ledbetter ◽  
H. M. Jennings
Keyword(s):  
Cement Paste ◽  
High Speed ◽  
Initial Study ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Cement Pastes ◽  
Shear Mixing ◽  
Paddle Mixer

AbstractThe influence of shear mixing on selected properties of cement pastes and mortars was investigated by preparing specimens using an ordinary paddle mixer and a high speed shear mixer. The results appear to indicate that shear mixing influences the bond between paste and aggregate, particularily at low water:cement ratios. The properties of hardened cement paste did not change markedly as a result of high speed shear mixing used in this initial study.

scholarly journals A numerical study of fatigue of hardened cement paste at the microscale

2021 ◽  
pp. 106401
Author(s):  
Yidong Gan ◽  
Hongzhi Zhang ◽  
Minfei Liang ◽  
Erik Schlangen ◽  
Klaas van Breugel ◽  
...  
Keyword(s):  
Cement Paste ◽  
Numerical Study ◽  
Hardened Cement ◽  
Hardened Cement Paste

Hygral stress in hardened cement paste

1999 ◽  
Vol 32 (9) ◽  
pp. 627-634 ◽  
Author(s):  
R. E. Beddoe ◽  
R. Lippok
Keyword(s):  
Cement Paste ◽  
Hardened Cement ◽  
Hardened Cement Paste

scholarly journals Experimental investigation of the short-term creep recovery of hardened cement paste at micrometre length scale

2021 ◽  
Vol 149 ◽  
pp. 106562
Author(s):  
Yidong Gan ◽  
Matthieu Vandamme ◽  
Yu Chen ◽  
Erik Schlangen ◽  
Klaas van Breugel ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Cement Paste ◽  
Creep Recovery ◽  
Hardened Cement ◽  
Length Scale ◽  
Hardened Cement Paste ◽  
Short Term ◽  
Term Creep ◽  
Short Term Creep
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