Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Characteristics of pore structure of stabilized/solidified sediments during freeze–thaw cycles
Highlights Deformation parameters were changed by freeze–thaw cycles (FTs). Cracks developed gradually and pore surfaces were smoothed during FTs. Slits and bottle-neck pores were detected in the stabilized/solidified sediments. Pores larger than 105 nm shrank and were damaged during FTs. Pores smaller than 105 nm were expanded during FTs.
Abstract The stabilized/solidified (S/S) sediments are supposed to be damaged by freeze–thaw cycles (FTs), and their deformation parameters such as void ratio, compression modulus and consolidation coefficient changed during FTs. The characteristics of pore structure of S/S sediments during FTs are critical for identifying the damage mechanisms, since these damages are primarily induced by the water-phase changes in the pores. Hence, FTs were first simulated in laboratory to prepare S/S sediments samples in different conditions. Then, oedometer tests were launched on these samples to observe the changing of the deformation parameters of S/S sediments in different FTs. After that, scanning electron microscopy analysis (SEM) was applied to observe the changing of the micro pore structure aspects of S/S sediments in different FTs. And finally, the combined application of mercury intrusion porosimetry analysis (MIP) and nitrogen adsorption porosimetry analysis (NAP) was conducted to ascertain the changing of the micro pore structure of S/S sediments in different FTs quantitatively, including the changing of pore-size distributions and pore surface roughness. The comprehensive analysis of pore structure of S/S sediments by SEM, MIP and NAP appropriately explained the changes of deformation parameters in the oedometer tests. Furthermore, the necessity and validity of combined application of MIP and NAP were proved, for full-scale pore structure analysis of S/S sediments during FTs.
Characteristics of pore structure of stabilized/solidified sediments during freeze–thaw cycles
Highlights Deformation parameters were changed by freeze–thaw cycles (FTs). Cracks developed gradually and pore surfaces were smoothed during FTs. Slits and bottle-neck pores were detected in the stabilized/solidified sediments. Pores larger than 105 nm shrank and were damaged during FTs. Pores smaller than 105 nm were expanded during FTs.
Abstract The stabilized/solidified (S/S) sediments are supposed to be damaged by freeze–thaw cycles (FTs), and their deformation parameters such as void ratio, compression modulus and consolidation coefficient changed during FTs. The characteristics of pore structure of S/S sediments during FTs are critical for identifying the damage mechanisms, since these damages are primarily induced by the water-phase changes in the pores. Hence, FTs were first simulated in laboratory to prepare S/S sediments samples in different conditions. Then, oedometer tests were launched on these samples to observe the changing of the deformation parameters of S/S sediments in different FTs. After that, scanning electron microscopy analysis (SEM) was applied to observe the changing of the micro pore structure aspects of S/S sediments in different FTs. And finally, the combined application of mercury intrusion porosimetry analysis (MIP) and nitrogen adsorption porosimetry analysis (NAP) was conducted to ascertain the changing of the micro pore structure of S/S sediments in different FTs quantitatively, including the changing of pore-size distributions and pore surface roughness. The comprehensive analysis of pore structure of S/S sediments by SEM, MIP and NAP appropriately explained the changes of deformation parameters in the oedometer tests. Furthermore, the necessity and validity of combined application of MIP and NAP were proved, for full-scale pore structure analysis of S/S sediments during FTs.
Characteristics of pore structure of stabilized/solidified sediments during freeze–thaw cycles
Wang, Hong-Xing (Autor:in) / Wu, Zong-Zong (Autor:in) / Tan, Yun-Zhi (Autor:in) / Cui, Xian-Ze (Autor:in) / Zuo, Qing-Jun (Autor:in) / Wang, Le-Hua (Autor:in) / Lu, Li-Qiang (Autor:in)
01.06.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Shear properties and pore structure characteristics of soil–rock mixture under freeze–thaw cycles
| Online Contents | 2021