文献类型：期刊文献

英文题名：Composite Geopolymer Based on Copper Tailings: Mechanical Properties, Strength Models and Microstructure

作者：Wei, Wang[1]; Wei, Pengfei[1]; Jiang, Ping[1]; Li, Na[1]; Chu, Fuyong[2]; Fu, Jiajia[1,3]; Wang, Xudong[3]

机构：[1] School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China; [2] School of Civil Engineering and Architecture, Wenzhou Polytechnic, Wenzhou, 325035, China; [3] School of Transportation Engineering, Nanjing Tech University, Nanjing, 211816, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240213173)

语种：英文

外文关键词：Chemical activation - Compression testing - Compressive strength - Copper - Fly ash - Geopolymers - Inorganic polymers - Pore structure - Scanning electron microscopy - Soil cement - Soil testing - Soils

外文摘要：In order to seek an effective way of resource utilization of copper tailings, fly ash, cement and soft soil were used as the auxiliary cementitious materials for alkali activation he effect of NaOH content on the strength characteristics of fly ash, cement, soft soil and copper tailings (FCSCT) based composite geopolymer was investigated through unconfined compressive strength (UCS) tests and triaxial compression tests. The mineral composition and microstructure of FCSCT based geopolymer were studied through X-ray diffraction (XRD) tests and scanning electron microscopy (SEM) tests. The results show that: (1) With the increase of NaOH content, the UCS of FCSCT samples first increase and then decrease, and reach the maximum value when the NaOH content is 1%. Compared with the sample without NaOH, the UCS of FCSCT1 samples is increased by 69% at 28d. (2) The triaxial strength and shear strength parameters have the same variation as UCS with the increase of NaOH content, and the optimal NaOH content is 1%. (3) The incorporation of NaOH promotes the formation of geopolymer gel, refines the pore structure and increases the density of the sample, thereby improving the strength of the sample. Finally, a digital model between UCS and triaxial strength is established, which provides theoretical support for practical engineering applications. ? 2024, The Authors. All rights reserved.