Relationship between Fractal Characteristics and Strength of Silica Fume Fiber Reinforced Pumice Concrete Based on NMR Technology
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％.
国家科技期刊平台
NSTL
万方数据
