文献类型：期刊文献

英文题名：Soil utilization of solid waste: Small-strain dynamic properties and microscopic mechanism of phosphogypsum-modified coastal cement soil

作者：Pang, Yingdi[1];Li, Na[1];Fan, Meixin[1];Jiang, Ping[1];Zhou, Aizhao[3];Wang, Wei[1,2]

机构：[1]Shaoxing Univ, Shaoxing Key Lab Interact Soft Soil Fdn & Bldg Str, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Inst Artificial Intelligence, Shaoxing 312000, Zhejiang, Peoples R China;[3]Suzhou Univ Sci & Technol, Sch Civil Engn, Suzhou 215009, Peoples R China

年份：2024

卷号：33

起止页码：4265

外文期刊名：JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T

收录：SCI-EXPANDED(收录号：WOS:001338617900001)、、EI(收录号：20244217207483)、Scopus(收录号：2-s2.0-85206262871)、WOS

基金：This research was funded by National Natural Science Foundation of China (Grant number 52179107) .

语种：英文

外文关键词：Soft soil rehabilitation; Resonant column test; Phosphogypsum; Dynamic shear modulus; Hardin-Drnevich model

外文摘要：Phosphogypsum (PG), a solid waste from the wet process phosphoric acid industry, but the utilization rate is low at present. The effect of phosphogypsum and cement on small strain dynamic characteristics of coastal soft soil was studied by resonance column test, and characterize the micro-mechanisms of the specimens by SEM and EDS test. The results show that the dynamic shear modulu (G) and the damping ratio (D) firstly increase and then decrease with the PG level increasing. PG can motivate the formation of hydrated calcium silicate (C-S-H) gel and react with calcium aluminate to form calcium. The critical value for assessing the dynamic behavior of PCS under small strain is gamma = 10-4. The Hardin-Drnevich model eigenmodel can well characterize the dynamics of the PCS. Based on this model, a modified dynamic model is established to describe the dynamic characteristics of PCS. The microscopic results showed that the addition of phosphogypsum promoted the production of hydration products and made the particles more closely arranged. The content of this study provides a new reference for the application of solid waste phosphogypsum in cement soil.