Analysis on pore characteristics of hybrid basalt-polypropylene fiber-reinforced concrete based on nuclear magnetic resonance technology
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摘要: 采用核磁共振(Nuclear Magnetic Resonance,NMR)测试了玄武岩-聚丙烯混杂纤维混凝土(HBPRC)的孔隙特征,对比分析了玄武岩纤维(BF)和聚丙烯纤维(PF)以及二者混杂对HBPRC的抗压强度、孔隙率、孔径分布和曲折度的影响,并基于核磁共振T2谱和孔隙结构分形理论对4个孔径区域的孔隙结构分形维数进行了量化。结果表明:随着BF的添加,T2谱反映出适量的BF可以减小混凝土的孔隙率,而且有利于减小大孔体积占比;而随着PF含量增加,T2谱面积增加,且混凝土内部孔隙有变大的趋势。掺入BF-PF混杂纤维对混凝土的孔隙特征会产生正协同作用,当BF和PF掺量均为0.05%时,协同作用最佳,与普通混凝土相比,抗压强度提高了3.52%、孔隙率降低了1.47%、曲折度提高了8.20%。凝胶孔体积占比增大了8.76%,大孔体积占比降低了5.30%,孔径分布得到优化。HBPRC的孔隙结构具有明显的分形特征,孔隙结构分形维数在过渡孔、毛细孔和大孔区域依次增加,此外,分形维数越大,抗压强度越大。通过微观分析认为,纤维在混凝土基体中的粘结状态和分布是影响HBPRC孔隙分形特征的主要原因。
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关键词:
- 玄武岩-聚丙烯混杂纤维混凝土 /
- 核磁共振 /
- 孔隙特征 /
- 抗压强度 /
- 孔隙结构分形维数
Abstract: 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 0.05%, 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. -
表 1 胶凝材料和BF化学组成(wt%)
Table 1. Chemical composition of cementitious materials and BF (wt%)
Composition SiO2 Al2O3 Fe2O3 CaO MgO Cement 34.67 7.90 2.93 35.5 1.77 Fly Ash 50.77 22.68 5.64 5.98 1.74 BF 51.4 15.4 9.8 9 5.7 表 2 BF和PF的物理力学性能
Table 2. Physical and mechanical of BF and PF
Type Density/(kg·m−3) Tensile Strength/MPa Elastic Modulus/GPa Diameter/μm Length/mm BF 2.65 ≥2400 ≥40 15 18 PF 0.91 270 0.3 30 19 表 3 玄武岩-聚丙烯混杂纤维混凝土(HBPRC)配合比
Table 3. Mix proportions of hybrid basalt-polypropylene fiber-reinforced concrete (HBPRC)
Mixtures Mixture composition/(kg·m−3) C W CA S FA PBS BF PF BF0PF0 320 160 1068 712 100 6.3 0 0 BF0.05PF0 320 160 1068 712 100 6.3 1.3 0 BF0.1PF0 320 160 1068 712 100 6.3 2.6 0 BF0PF0.05 320 160 1068 712 100 6.3 0 0.5 BF0PF0.1 320 160 1068 712 100 6.3 0 0.9 BF0.05PF0.05 320 160 1068 712 100 6.3 1.3 0.5 BF0.1PF0.05 320 160 1068 712 100 6.3 2.6 0.5 BF0.05PF0.1 320 160 1068 712 100 6.3 1.3 0.9 BF0.1PF0.1 320 160 1068 712 100 6.3 2.6 0.9 Notes: "C" refers to cement, "W" refers to water, "CA" refers to coarse aggregate, "S" refers to river sand, "FA" refers to fly ash, "PBS" refers to performance water reducer, "BF" refers to basalt fiber, "PF" refers to polypropylene fiber, "0", "0.05", "0.1" represent the fiber volume content of 0%, 0.05%, 0.1%, respectively 表 4 HBPRC的横向弛豫T2谱峰面积比例
Table 4. Transverse relaxation-time T2 spectral peak area percentage of HBPRC
Mixtures Peak 1/% Peak 2/% Peak 3/% Peak 4/% BF0PF0 62.60 13.91 10.18 13.28 BF0.05PF0 72.54 11.55 8.70 7.19 BF0.1PF0 61.79 13.66 10.07 14.46 BF0PF0.05 51.43 13.69 12.42 22.44 BF0PF0.1 56.05 13.77 10.25 19.92 BF0.05PF0.05 69.48 12.72 10.97 6.81 BF0.1PF0.05 64.08 13.52 9.44 12.94 BF0.05PF0.1 55.91 15.72 10.96 17.39 BF0.1PF0.1 65.80 14.44 12.14 7.60 -
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