| Citation: |
HUANG Guansong, SU Li, XUE Cuizhen, et al. Analysis on pore characteristics of hybrid basalt-polypropylene fiber-reinforced concrete based on nuclear magnetic resonance technology[J]. Acta Materiae Compositae Sinica, 2025, 42(2): 1034-1048. DOI: 10.13801/j.cnki.fhclxb.20240520.002
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The pore characteristics of hybrid basalt-polypropylene fiber-reinforced concrete (HBPRC) was tested by nuclear magnetic resonance (NMR). The effects of basalt fiber (BF) and polypropylene fiber (PF) as well as their blends on the compressive strength, porosity, pore size distribution and tortuosity of HBPRC were analyzed comparatively. The fractal dimensions of the pore structure in four pore-size regions were quantified based on the T2 spectra of NMR and pore structure fractal theory. The results show that with the addition of BF, the T2 spectrum reflects that the appropriate amount of BF can reduce the porosity of concrete, and it is beneficial to reduce the percentage of large pore volume. But as the PF content increases, the T2 spectral area increases and there is a tendency for the pores of the concrete to become larger. Incorporation of BF-PF hybrid fibers produces a positive synergistic effect on the pore characteristics of concrete. The synergistic effect is optimal when the dosage of both BF and PF is 0.05vol%, which improves the compressive strength by 3.52%, reduces the porosity by 1.47%, increases the volume percentage of gel pores by 8.76%, increases the tortuosity by 8.20%, and reduces the volume percentage of large pores by 5.30%, and optimizes the distribution of pore size, as compared with ordinary concrete. There are obvious fractal characteristics in the pore structure of HBPRC, and the fractal dimensions of the pore structure of HBPRC increases sequentially in the region of transition pores, capillary pores, and large pores. In addition, the larger the fractal dimension, the greater the compressive strength. It is concluded from the microscopic analysis that the bonding state and distribution of fibers in the concrete matrix are the main reasons affecting the pore fractal characteristics of HBPRC.
To study the pore characteristics including spectral distribution, porosity, pore size distribution, curvature, etc. and the relationship between fractal dimension of pore structure and compressive strength of basalt-polypropylene hybrid fiber reinforced concrete (HBPRC) with different admixtures.
The effects of BF, PF and BF-PF hybrids on the pore characteristics and compressive strength of concrete were jointly revealed using NMR, SEM micro-morphology analysis and fractal theory.
The appropriate amount of BF can reduce the porosity of concrete，and with the increase of PF content, the internal pores of concrete have a tendency to expand. When the dosage of both BF and PF is 0.05%, which can form a uniformly distributed three-dimensional fiber network inside the concrete, and play a positive synergistic effect in the concrete. Compared with ordinary concrete, the porosity of BF0.05PF0.05 is reduced by 1.47%, the proportion of gel pores is increased by 8.76%, and the proportion of large pores is reduced by 5.30%, which optimizes the pore size distribution of the concrete, and at the same time improves the compressive strength and tortuosity of the concrete. It is shown by fractal theory that the pore structure of HBPRC has obvious fractal characteristics, and the fractal dimension of the pore structure decreases with the increase of pore diameter, and there is a correlation with the compressive strength. The microscopic analysis suggests that the bonding state and distribution of fibers in the concrete matrix is the main reason for the pore fractal characteristics of HBPRC.Conclusions: In summary, BF-PF hybrid can reduce the porosity of concrete, optimize the pore size distribution, improve the tortuosity of pores, and make concrete have better pore characteristics. It is also concluded that the pore structure of HBPRC has obvious fractal characteristics. Moreover, the fractal dimension of the pore structure can be used as both a quantitative expression of its pore fractal characteristics and an objective response to its compressive strength.
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