文献类型：期刊文献

英文题名：The Influence of Mineral Powder Dosage on the Mechanical Properties and Microstructure of Self-Compacting Concrete

作者：Duan, Li Xu, Guihong Deng, Wenbo He, Li Hu, Yi

第一作者：段莉

通信作者：Xu, GH[1]

机构：[1]Guizhou Inst Technol, Sch Civil Engn, Guiyang 550003, Peoples R China;[2]Chongqing Rail Transit Grp Co Ltd, Chongqing 400000, Peoples R China;[3]Bijie Yuyuan Bldg Mat Co Ltd, Bijie 551700, Peoples R China

第一机构：贵州理工学院土木工程学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Civil Engn, Guiyang 550003, Peoples R China.|贵州理工学院土木工程学院;贵州理工学院;

年份：2025

卷号：9

期号：6

外文期刊名：JOURNAL OF COMPOSITES SCIENCE

收录：Scopus(收录号：2-s2.0-105009135358);WOS:【ESCI(收录号:WOS:001516769400001)】；

基金：This research was funded by Guizhou Provincial Science and Technology Plan Project grant number: QIAN KE HE JICHU-ZK[2022]YIBAN 170, ZHONGDIAN 027; the National Natural Science Foundation Project, grant number: 52268065; QIAN KE HE Platform Talents, grant number: GCC[2023]053; and the Guizhou Province Urban Rail Transit Infrastructure Operation and Maintenance and Digital Twin Application Science and Technology Innovation Talent Team grant number: QIAN KE HE CXTD[2025]042 And The APC was funded by Guizhou Provincial Science and Technology Plan Project.

语种：英文

外文关键词：self-compacting concrete; microstructure; characteristics; fractal dimension

摘要：The dosage of mineral powder has a complex influence on the compressive strength of self-compacting concrete, among which the pore structure is a key determining factor. This study investigated the effects of different dosages of mineral powder (0%, 5%, 10%, 20%, and 30%) on the workability, mechanical properties, and pore distribution in C80 self-compacting concrete. The research results show that an appropriate dosage of mineral powder (0-20%) can significantly improve the spreadability and fluidity of C80 self-compacting concrete. This phenomenon is mainly attributed to the shape effect and micro-aggregate effect of mineral powder, which improve the fluidity of concrete, reduce the viscosity of the paste, and thereby increase the spreadability and gap-passing rate. By testing the BSD-PS1/2 series fully automatic specific surface area and pore size analyzer, we found that there are columnar pores and ink bottle-shaped pores in C80 self-compacting concrete, as well as a small amount of plate-like slit structures. Our observations with an SEM scanning electron microscope revealed that the width of micro-cracks and micro-holes is between 1 and 5 mu m and the diameter is between 3 and 10 mu m. These microstructures may have an impact on the mechanical properties of the structure. By applying fractal theory and low-temperature liquid nitrogen adsorption tests, this study revealed the relationship between the fractal characteristics of internal pores in C80 self-compacting concrete and the dosage of mineral powder. The results show that with the increase in mineral powder dosage, the fractal dimension first decreases and then increases, reflecting the change rule of the complexity of pore structure first decreasing and then increasing. When the dosage of mineral powder is about 20%, the compressive strength of SCC reaches the maximum value, and this dosage range should be considered in engineering design.