TY - JOUR
T1 - Surface tension of cementitious pore solutions at low atmospheric pressure
T2 - An experimental exploration
AU - Lan, Xu-li
AU - Zeng, Xiao-hui
AU - Zhu, Hua-sheng
AU - Umar, Hussaini Abdullahi
AU - Long, Guang-cheng
AU - Tang, Zhuo
AU - Xie, You-jun
PY - 2024/1
Y1 - 2024/1
N2 - Currently, it is believed that surface tension increases with the reduction of atmospheric pressure, and the increased surface tension is considered as the primary cause of the decreased bubble stability in cement-based materials at low atmospheric pressure. However, this viewpoint lacks experimental verification due to the difficulty in measuring surface tension at low atmospheric pressure. This study systematically explores the effect of low atmospheric pressure (0∼0.1 MPa) on the surface tension of pore solutions of fresh cement pastes. The surface tension of pore solutions was measured at different atmospheric pressures by using the high-accuracy automatic interface tension meter. Results show that the impact of low atmospheric pressure on the surface tension of deionized water, cement and fly ash pore solutions is insignificant. Therefore, the decrease in bubble stability and air content of concrete at low atmospheric pressure cannot be attributed to the change of surface tension. The effect of low atmospheric pressure on the surface tension of air-liquid interface is explained from the perspective of intermolecular force and density. This research helps to better understand the impact of low atmospheric pressure on surface tension and lays the essential groundwork for improving bubble stability of cement-based materials in high-altitude regions. © 2023 Elsevier Ltd
AB - Currently, it is believed that surface tension increases with the reduction of atmospheric pressure, and the increased surface tension is considered as the primary cause of the decreased bubble stability in cement-based materials at low atmospheric pressure. However, this viewpoint lacks experimental verification due to the difficulty in measuring surface tension at low atmospheric pressure. This study systematically explores the effect of low atmospheric pressure (0∼0.1 MPa) on the surface tension of pore solutions of fresh cement pastes. The surface tension of pore solutions was measured at different atmospheric pressures by using the high-accuracy automatic interface tension meter. Results show that the impact of low atmospheric pressure on the surface tension of deionized water, cement and fly ash pore solutions is insignificant. Therefore, the decrease in bubble stability and air content of concrete at low atmospheric pressure cannot be attributed to the change of surface tension. The effect of low atmospheric pressure on the surface tension of air-liquid interface is explained from the perspective of intermolecular force and density. This research helps to better understand the impact of low atmospheric pressure on surface tension and lays the essential groundwork for improving bubble stability of cement-based materials in high-altitude regions. © 2023 Elsevier Ltd
KW - Cement
KW - Fly ash
KW - Low air pressure
KW - Pore solution
KW - Surface tension
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85173586750&origin=recordpage
U2 - 10.1016/j.cemconcomp.2023.105309
DO - 10.1016/j.cemconcomp.2023.105309
M3 - RGC 21 - Publication in refereed journal
SN - 0958-9465
VL - 145
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 105309
ER -