Dynamic characteristics and micro-mechanisms of coastal cement soil modified by nano-Al2O3

被引：0
|
作者：
Zhuang X. [1 ]
Yang B. [1 ]
Tao G. [1 ]
机构：
[1] School of Civil Engineering Architecture and Environment, Hubei University of Technology, Wuhan
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2024年 / 58卷 / 07期
关键词：
cement soil; corrosive environment; cyclic loading; microstructure; nano-Al[!sub]2[!/sub]O[!sub]3[!/sub;
D O I：
10.3785/j.issn.1008-973X.2024.07.015
中图分类号：
学科分类号：
摘要：
Dynamic triaxial, SEM, NMR and other tests were carried out under cyclic loading and corrosive environment to analyze the dynamic stress-strain, dynamic elastic modulus, damping ratio and microscopic pore changes in nano-Al2O3 modified coastal cement soil. Test results show that the dynamic strain increases with the increase of dynamic stress, and the dynamic elastic modulus decreases with the increase of dynamic stress. The increase in loading frequency makes the dynamic strain decrease and the dynamic elastic modulus increase. The increase in the mass fraction of set salt makes the dynamic strain increase and the dynamic elastic modulus decrease. The damping ratio-dynamic strain curve of nano-Al2O3 modified cement soil gradually moves down with the increase of loading frequency, and the intersection point of the curves appears at different loading frequencies, and the intersection point moves to the right with the increase of the mass fraction of set salt. The peak value and peak area of the main peak of the relaxation time distribution curve of the nano-Al2O3 modified cement soil were significantly lower than those of the pure cement soil, and the C-S-H and C-A-H gel substances were cemented in the soil pores to form a spatial network structure, and the cementation effect was significant. Nano-Al2O3 modified cement soil showed a significant reduction in porosity at small sea salt mass fractions and exhibited lower porosity compared to the pure cement soil. © 2024 Zhejiang University. All rights reserved.
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页码：1457 / 1466
页数：9
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  • [1] WANG Wei, LIU Jingjing, LI Na, Et al., Mechanical properties and micro mechanism of nano-SiO<sub>2</sub> modified coastal cement soil at short age [J], Acta Materiae Compositae Sinica, 39, 4, pp. 1701-1714, (2022)
  • [2] BASHA E A, HASHIM R, MAHMUD H B, Et al., Stabilization of residual soil with rice husk ash and cement [J], Construction and Building Materials, 19, 6, pp. 448-453, (2005)
  • [3] AHMAD M R, CHEN B, YU J., A comprehensive study of basalt fiber reinforced magnesium phosphate cement incorporating ultrafine fly ash [J], Composites Part B: Engineering, 168, pp. 204-217, (2019)
  • [4] QIN L, GAO X., Properties of coal gangue-Portland cement mixture with carbonation [J], Fuel, 245, pp. 1-12, (2019)
  • [5] GAO Changhui, MA Qingyong, Analysis of silty clay stabilized by cement mortar based on split Hopkinson pressure bar experiment [J], Acta Materiae Compositae Sinica, 35, 6, pp. 1629-1635, (2018)
  • [6] WAN Zhihui, DAI Guoliang, GONG Weiming, Et al., Experimental study on micro-erosion mechanism of cement stabilized calcareous sand under seawater environment [J], Rock and Soil Mechanics, 42, 7, pp. 1871-1882, (2021)
  • [7] LIU Quansheng, QU Jiawang, LIU Zhiping, Et al., Experimental study of mechanical properties of cemented soil under corrosion influence [J], Rock and Soil Mechanics, 35, 12, pp. 3377-3384, (2014)
  • [8] WU Yankai, SHI Kejian, HU Xiaoshi, Et al., Experimental study on strength degradation of steel slag + cement-solidified soil under seawater erosion [J], Chinese Journal of Geotechnical Engineering, 41, 6, pp. 1014-1022, (2019)
  • [9] YAN Nan, YANG Junjie, LIU Qiang, Et al., Laboratory test on strength deterioration process of soil cement in seawater environment [J], China Civil Engineering Journal, 50, 11, pp. 115-124, (2017)
  • [10] LIN D, LIN K L, CHANG W C, Et al., Improvements of nano-SiO<sub>2</sub> on sludge/fly ash mortar [J], Waste Management, 28, 6, pp. 1081-1087, (2008)
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