文献类型：期刊文献

英文题名：Experimental investigation on static and dynamic properties of nanosilica modified cement soil

作者：Wang, Wei[1];Wu, Erlu[1,2];Huang, Shuaishuai[1];Song, Xingjiang[3];Li, Na[1];Jiang, Ping[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, 508 Huancheng West Rd, Shaoxing 312000, Peoples R China;[2]Chongqing Jiaotong Univ, Sch Civil Engn, 66 Xuefudadao Rd, Chongqing 400074, Peoples R China;[3]Minist Water Resources, Huaihe River Commiss, Bengbu 233001, Peoples R China

年份：2024

卷号：412

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001154568100001)、、EI(收录号：20240215355800)、Scopus(收录号：2-s2.0-85181768049)、WOS

基金：This work is supported by National Natural Science Foundation of China (52179107) .

语种：英文

外文关键词：Nanosilica; Cement soil; Dispersion method; Dynamic properties; Cumulative plastic axial strain

外文摘要：It has been proved that nanosilica can improve the mechanical properties of cement soil, however, the static and dynamic properties of nanosilica modified cement soil and dispersion method study of nanosilica in cement soil were few, thereby investigated by unconfined compression test and dynamic triaxial test in this study. A series of unconfined compression test results indicated that the dispersion method of nanosilica is of importance in the strength of nanosilica modified cement soil (NCS), and soaking in water for 24 h is the optimal dispersion method among designed methods. Unconfined compressive strength (UCS) increases with increasing nanosilica content in the range of 0 to 0.4%, and then reduces gradually while nanosilica content is beyond 0.4%. The optimal nanosilica content can be seen as 0.4%, and the corresponding UCS at the curing age of 7 d is 960 kPa, which increases by 47.2% comparing to the specimen without nanosilica. Dynamic triaxial test reveals that the variation of the cumulative plastic axial strain and dynamic elastic modulus versus nanosilica content are same and opposite to UCS respectively, and the minimum of the cumulative plastic axial strain and maximum of dynamic elastic modulus are obtained while nanosilica content is 0.4%, which reduces by 48.1% and increases by 69.8% respectively comparing to the specimen without nanosilica. Finally, a simple and practical prediction model is developed to capture the evolution of the cumulative plastic axial strain with cycle number, and its simulation effect is validated by dynamic triaxial test results. It is believed that this paper finds an efficient dispersion method of nanosilica in cement soil, and provides the dynamic properties of nanosilica modified cement soil, which can promote practical application of nanosilica in road engineering.