文献类型：期刊文献

英文题名：Effect of Microscopic Pore Structure on the Mechanical Properties of Raw Phosphogypsum-Basalt Fiber Cementitious Materials

作者：Xu, Guihong He, Li Zhang, Yan Xu, Weihong Chen, Ziwei Fang, Qianbao Li, Yonghui Zhang, Weibiao

第一作者：徐桂弘

通信作者：He, L[1]

机构：[1]Guizhou Inst Technol, Sch Civil Engn Transportat & Water Conservancy, Guiyang 550025, Peoples R China;[2]Guizhou Phosphorus Green Environm Protect Ind Co L, Guiyang 551109, Peoples R China;[3]Design & Res Inst Co Ltd, China Railway Eryuan Guiyang Survey, Guiyang 550081, Peoples R China;[4]Chengdu Univ Technol, Coll Ecol & Environm, Chengdu 610059, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Civil Engn Transportat & Water Conservancy, Guiyang 550025, Peoples R China.|贵州理工学院;

年份：2026

卷号：16

期号：9

外文期刊名：BUILDINGS

收录：;EI(收录号：20262020719820);Scopus(收录号：2-s2.0-105038777085);WOS:【SCI-EXPANDED(收录号:WOS:001763779900001)】；

基金：This research was funded by the Guiyang City Science and Technology Plan Project, grant number ZHUKE HETONG [2024]-1-8; the Natural Science Foundation of Guizhou Province (QIAN KE HEJICHU ZK [2022] ZHONGDIAN 027, QianKeHe Ren Cai-CXTD [2025]042, QIAN KE HEJICHU-ZK [2022] YIBAN 174); the National Natural Science Foundation of China, grant number 52268065, 52560015; the Technology Department Foundation of Guizhou Province, grant number QIAN KE HE Platform Talents-GCC [2023]053; and the Guizhou Province Science and Technology Plan Project (Qiankehe Platform KXJZ [2024]020, Qiankehe Platform KXJZ (2025) 004).

语种：英文

外文关键词：raw PG-basalt fiber; cementitious material; mechanical properties; pore size analysis

摘要：This study investigates the mechanical properties and internal pore structure characteristics of raw phosphogypsum-basalt fiber (RPG-BF) cementitious materials with varying raw phosphogypsum (PG) replacement ratios. Specifically, six different PG addition levels (0%, 3%, 6%, 9%, 12%, and 15% by mass of cementitious materials) with a constant basalt fiber dosage of 0.1% (by volume of concrete) were adopted. The mechanical properties of RPG-BF cementitious materials were evaluated by testing the 7-day and 28-day compressive strengths, 28-day split tensile strength, and 28-day flexural strength. Meanwhile, the pore distribution characteristics of the RPG-BF cementitious materials were systematically analyzed using liquid nitrogen adsorption (LNA) tests and scanning electron microscopy (SEM) observations. The experimental results indicate the following: (a) With an increase in PG content, the mechanical properties of RPG-BF cementitious materials exhibit a significant downward trend: the 28-day compressive strength, split tensile strength, and flexural strength decrease by 49%, 44%, and 43%, respectively. (b) The internal pores of the RPG-BF cementitious materials possess excellent fractal characteristics, with fractal dimensions ranging from 2.52 to 2.62. As the PG content increases, the pore structure becomes more intricate and less homogeneous, which is a microstructural factor associated with the degradation of mechanical properties. (c) There exists a strong Pearson's linear correlation (R > 0.82, with R-2 ranging from 0.67 to 0.94) between the pore fractal dimension of RPG-BF cementitious materials and their 7-day/28-day compressive strength, split tensile strength, and flexural strength. (d) SEM observations show that the quantity of micropores and microcracks in the RPG-BF cementitious materials increases with increasing PG content, further confirming deterioration of the material microstructure.