材料科学与工程学报2024，Vol.42Issue(4)：614-623,650,11.DOI:10.14136/j.cnki.issn1673-2812.2024.04.011
基于核磁共振技术的硅灰纤维浮石混凝土分形特征与强度关系分析
Relationship between Fractal Characteristics and Strength of Silica Fume Fiber Reinforced Pumice Concrete Based on NMR Technology
摘要
Abstract
In order to explore the synergistic effect of silica fume and glass fibers on pumice concrete,glass fiber reinforced pumice concrete (GFRPC) was prepared by replacing cement with silica fume,and the macroscopic mechanical test was carried out.The pore structure of GFRPC was tested by means of nuclear magnetic resonance (NMR) technique,and the complexity of pore structure was quantitatively described by fractal theory.The relationship between pore characteristic parameters,fractal dimension and compressive strength was discussed.The results show that the synergistic effect of silica fume and glass fibers can effectively improve the mechanical properties of GFRPC.Compared with the compressive strength,the splitting tensile strength and toughness are improved more significantly.The T2 spectrum in GFRPC nuclear magnetic resonance shows a "primary and secondary peak" structure,and the pore structure has obvious multifractal characteristics.There are significant differences in pore fractal dimension and characteristics among different pore sizes.The addition of silica fume can effectively improve the interface transition zone between cement matrix,glass fiber and pumice aggregate,and enhance the interfacial bonding property.Considering the influence of pore characteristic parameters and fractal dimension on GFRPC compressive strength,a strength-pore structure model established on this basis has high fitting accuracy.The average relative error between the predicted value of the model and the experimental value is 1.047％.关键词
浮石混凝土/玻璃纤维/硅灰/力学性能/微观结构/NMR/分形维数Key words
Pumice concrete/Glass fiber/Silica fume/Mechanical properties/Microstructure/NMR/Fractal dimension分类
建筑与水利引用本文复制引用
邓凯元,李红云..基于核磁共振技术的硅灰纤维浮石混凝土分形特征与强度关系分析[J].材料科学与工程学报,2024,42(4):614-623,650,11.基金项目
内蒙古自治区高等学校科学技术研究项目(NJZZ22517) （NJZZ22517）
