文献类型：期刊文献

英文题名：Study on the strength characteristics and microscopic mechanism of sewage sludge ash modified lime soil

作者：Wang, Wei[1,2];Wei, Pengfei[1];Li, Na[1,2];Wu, Erlu[1,2,3];Jiang, Ping[1,2];Wang, Junjie[3]

机构：[1]Shaoxing Univ, Sch Civil Engn, 508 Huancheng Rd, Shaoxing 312000, Peoples R China;[2]Shaoxing Key Lab Interact Soft Soil Fdn & Bldg Str, Shaoxing 312000, Peoples R China;[3]Chongqing Jiaotong Univ, Sch Mat Sci & Engn, Chongqing 400074, Peoples R China

年份：2024

卷号：12

期号：6

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001350636000001)、、EI(收录号：20244517319810)、Scopus(收录号：2-s2.0-85208056443)、WOS

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

语种：英文

外文关键词：Sewage sludge ash; Lime; Mechanical properties; Microstructure; Strength prediction model

外文摘要：The large amount of sewage sludge ash (SSA) generated by incineration treatment of sewage sludge each year can seriously pollute the environment, and there is an urgent need to seek an effective resource utilization method for SSA treatment. SSA has the significant pozzolanic activity, and can be used as an auxiliary cementitious material. For that, SSA was adopted to modify lime soil in this work. The strength characteristics of SSA modified lime soil (SLS) were investigated by conducting unconfined compressive strength test and unconsolidated-undrained triaxial compression test, and X-ray diffraction (XRD) test and scanning electron microscopy (SEM) test were conducted to investigate the mineral composition, microstructure and porosity of SLS. It is observed that the unconfined compressive strength (UCS) increases first and then decreases with increasing SSA content in the range of 0-20 %, and reaches the maximum value while SSA content is 15 %, which increases by 25 % at the curing age of 28 days comparing to the specimen without SSA. Additionally, the triaxial strength and cohesive force both have the same change law as UCS with SSA increasing, and 15 % can be used as the optimal content of SSA to modify lime soil. The added SSA can promote the pozzolanic reaction, and more hydration products fill the specimen porosity so that the specimen strength can be improved. Furthermore, the porosity of SLS decreases first and then increases with SSA content increasing, and there is a linear relationship between the porosity and strength of SLS. Finally, a simple function is proposed, which can simulate the quantitative relationship between UCS and the triaxial strength with satisfying accuracy. Generally, the research results can be used as a reference for the application of SSA in soft soil foundation treatment.