文献类型：期刊文献

英文题名：Dynamic characteristics and microscopic mechanism of graphene oxide modified coastal soft soil under small strain

作者：Fu, Jiajia[1,3];Wang, Wei[1,2];Feng, Tianhong[2];Wang, Xudong[1];Wu, Hongxiang[2];Xu, Mengqi[2]

机构：[1]Nanjing Tech Univ, Sch Transportat Engn, Nanjing 211816, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[3]Yancheng Polytech Coll, Dept Architecture & Engn, Yancheng 224005, Peoples R China

年份：2024

卷号：448

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001325505700001)、、EI(收录号：20243717023082)、Scopus(收录号：2-s2.0-85203411847)、WOS

基金：This research was funded by National Natural Science Foundation of China (52179107) , Industry-University-Research Cooperation Program of Jiangsu Province, China (BY20231104) , and Scientific Research Fund of Yancheng Polytechnic College (ygy202007) .

语种：英文

外文关键词：Small-strain dynamic properties; Resonant-column test; Coastal soft soil; Cement; Graphene oxide; Microstructural analysis

外文摘要：Graphene oxide (GO) has been shown to improve the static mechanical properties of cement soils. However, the dynamic mechanical properties of GO-modified cement soils are rarely investigated. Therefore, in this study, the effects of different confining pressures, GO contents, and curing ages on the small-strain dynamic shear modulus (G) and damping ratio (D) of GO-modified coastal cement soil (GOCS) are investigated via resonant column tests. The results show that the G of GOCS increases with the confining pressure, GO content, and curing age, whereas D decreases. Moreover, the GOCS indicate the highest stiffness improvement when 0.05 % GO is used as a modifier. The variation patterns of the maximum dynamic shear modulus and maximum damping ratio with the increase in the confining pressure, GO content, and curing age of the GOCS are consistent with the measured results. Microstructural analysis shows that the incorporation of GO can promote the early cement hydration of GOCS and increase its internal calcium-silicate-hydrate gel as well as its crystal types and numbers. The filling and bridging effects of GO not only enhance the stiffness of GOCS, thus increasing its G value, but also effectively reduce the energy consumption of the vibration wave in the sample, thus reducing its D value. The results of this study can provide important references and guidance for the design and construction of coastal soft-soil roadbed projects.