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.
Xinshan ZHUANG,Benchi YANG,Gaoliang TAO. Dynamic characteristics and micro-mechanisms of coastal cement soil modified by nano-Al2O3. Journal of ZheJiang University (Engineering Science), 2024, 58(7): 1457-1466.
Fig.2Dynamic stress-strain curves of modified cement soil
Fig.3Dynamic stress-strain curves of modified cement soil under different corrosion environments
Fig.4Dynamic elastic modulus-dynamic stress curves of modified cement soil
Fig.5Relationship between dynamic elastic modulus of modified cement soil and mass fraction of sea salt at different frequencies
Fig.6Stress-strain hysteresis curve in modified cement soil
Fig.7Damping ratio-dynamic stress curves of modified cement soil
Fig.8Relationship between damping ratio of modified cement soils and mass fraction of sea salt at different frequencies
Fig.9SEM diagram of nano-Al2O3 modified cement soil（magnification of 3000）
Fig.10SEM diagram of nano-Al2O3 modified cement soil（magnification of 10 000）
Fig.11Relaxation time distribution curve of nano-Al2O3 modified cement soil under different corrosion environments
Fig.12Relaxation time distribution curve of cement soil before and after modification with nano-Al2O3
Fig.13Microscopic mechanism model of nano-Al2O3 modified cement soil
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