Mechanical properties of basalt fiber reinforced polymer grids reinforced magnesium phosphate cement mortar composite
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摘要: 为了研究钢纤维与玄武岩纤维(BFRP)网格对磷酸镁水泥砂浆(MPCM)力学性能的增强效果，制备了BFRP网格MPCM复合材料(GRMM)。通过轴向拉伸试验和四点弯曲试验，研究材料复合方式(钢纤维增强、BFRP网格增强、复合增强)、BFRP网格厚度(1 mm、2 mm、3 mm)和BFRP网格表面形式(未处理、粘砂)对复合材料拉伸应力-应变曲线、弯曲应力-挠度曲线与关键力学参数的影响规律，以及钢纤维、BFRP网格在GRMM中的作用机制。结果表明：钢纤维主要在GRMM受力前期发挥作用，可以有效地抑制裂缝的产生，起到了增强、增韧的作用，钢纤维的掺入使拉伸试件与弯曲试件承载力分别提高了24.23%与215.33%，并提高了两类试件的抗裂性能、变形与耗能能力；BFRP网格作为拉应力的主要承担者，作用于GRMM整个受力过程，使两类试件的峰值变形提升了70倍以上，但试件中BFRP网格与MPCM受力并不协调；两种材料复合增强下，GRMM综合了钢纤维对基体的增强效果与BFRP网格的良好变形性能，其抗裂性能、强度、变形性能及耗能能力均得到提升；随着BFRP网格厚度的增加，GRMM试件强度与耗能能力得到进一步提升；BFRP网格表面进行粘砂处理对GRMM各项性能影响并不明显。Abstract: To investigate the influences of basalt fiber reinforced polymer (BFRP) grid and steel fibers on the mechanical properties of magnesium phosphate cement mortar (MPCM), BFRP grid reinforced MPCM composite (GRMM) was prepared. The effects of material forms (steel fiber reinforced, BFRP grid reinforced and composite reinforced), BFRP grid thicknesses (1 mm, 2 mm and 3 mm), and BFRP grid surface forms (untreated and sand-sticked) on the tensile stress-strain curves, bending stress-deflection curves, and key indexes of GRMM were investigated by the axial tensile test and four-point bending test. Moreover, the roles of steel fibers and BFRP grid in GRMM were also studied. The results show that steel fibers mainly play a role in the early stage, which can effectively inhibit the generation of cracks and improve the strength and toughness of GRMM. The incorporation of steel fibers increases the tensile and bending capacity by 24.23% and 215.33%, respectively, and improves the crack resistance, ductility and energy consumption of both types of specimens. The tensile stress is the mainly borne by BFRP grid, which plays a role throughout the whole loading process of GRMM. The incorporation of the BFRP grid improves the peak deformation of both tests by more than 70 times, but the BFRP grid is not coordinated with the MPCM in the specimen. Combined with the strengthening effects of steel fibers on the matrix and the good deformation of BFRP grid, the cracking resistance, strength, ductility and energy dissipation capacity of MPCM matrix are improved. As the thickness of the BFRP grid increases, the strength and energy dissipation capacity of the GRMM specimens are further improved. Sticking sand on the BRFP grid does not significantly affect the mechanical properties of GRMM.
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Key words:
- MPCM /
- BFRP grid /
- fiber reinforcement /
- tensile properties /
- bending properties
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图 3 玄武岩纤维网格增强磷酸镁水泥砂浆(GRMM)拉伸试件典型破坏图
Figure 3. Typical failure diagram of grid reinforced magnesium phosphate cement mortar (GRMM) tensile specimen
图 4 材料复合方式对GRMM拉伸应力-应变曲线的影响
Figure 4. Effect of material composite forms on GRMM tensile stress-strain curves
图 5 网格厚度对GRMM拉伸应力-应变曲线的影响
Figure 5. Effect of grid thickness on GRMM tensile stress-strain curves
图 6 配网率对GRMM拉伸应力损失及σcr/σsec的影响
Figure 6. Effect of grid quantity on GRMM tensile stress loss and σcr/σsec
图 7 网格表面形式对GRMM拉伸应力-应变曲线的影响
Figure 7. Effect of grid surface form on GRMM tensile stress-strain curves
图 9 材料复合方式对GRMM弯曲应力-挠度曲线的影响
Figure 9. Effect of material composite forms on GRMM bending stress-deflection curves
图 10 网格厚度对GRMM弯曲应力-挠度曲线的影响
Figure 10. Effect of grid thickness on GRMM bending stress-deflection curves
图 11 网格表面形式对GRMM弯曲应力-挠度曲线的影响
Figure 11. Effect of grid surface form on GRMM bending stress-deflection curves
表 1 磷酸镁水泥砂浆(MPCM)配合比及性能
Table 1. Mix proportion and material performance of magnesium phosphate cement mortar (MPCM)
Material Cement-A/
(kg·m−3)Cement-B/
(kg·m−3)Sand/
(kg·m−3)Water/
(kg·m−3)Borax/
(kg·m−3)Rf-3 h/
MPaRf-3 d/
MPaRc-3 h/
MPaRc-3 d/
MPaMPCM 660 660 800 200 26.4 10.3 11.5 49.2 55.7 Notes: Rf and Rc—Flexural strength and the compressive strength; 3 h and 3 d—Ages of MPCM. 
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表 2 玄武岩纤维(BFRP)网格材料性能
Table 2. Basalt fiber reinforced polymer (BFRP) grids material performance
Tensile strength/MPa Modulus of elasticity/GPa Elongation/% 493 25.37 1.9
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表 3 试件参数
Table 3. Specimen parameters
Specimen
numberFiber admix-
ture/%Grid thick-
ness/mmGrid surface forms T/BM0S0N-1/2/3 0 0 No treatment T/BM0S2N-1/2/3 2 0 T/BM2S0N-1/2/3 0 2 T/BM2S2N-1/2/3 2 2 T/BM1S2N-1/2/3 2 1 T/BM3S2N-1/2/3 2 3 T/BM3S2G-1/2/3 2 3 Sand-sticked Notes: In the specimen number, T/B is tensile/bending specimen, M is grid thickness, S is fiber admixture, N/G is grid with no treatment/sand-sticked, and 1/2/3 is parallel specimen numbers.
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表 4 GRMM拉伸试验结果
Table 4. GRMM tensile test results
Specimen grouping Specimen number σcr/MPa εcr/‰ Es/GPa σsec/MPa εu/‰ TM0S0N TM0S0N-1 4.15 0.17 22.6 — 0.17 TM0S0N-2 4.20 0.19 22.2 — 0.19 TM0S0N-3 3.81 0.16 24.6 — 0.16 Mean 4.05 0.17 23.1 — 0.17 Cov 0.04 0.08 0.05 — 0.08 TM0S2N TM0S2N-1 5.25 0.25 35.8 — 1.15 TM0S2N-3 5.53 0.18 31.1 — 1.67 Mean 5.39 0.22 33.4 — 1.41 Cov 0.03 0.15 0.07 — 0.18 TM2S0N TM2S0N-1 3.74 0.17 29.6 3.68 83.80 TM2S0N-3 3.94 0.18 26.6 3.63 88.93 Mean 3.84 0.18 28.1 3.66 86.37 Cov 0.11 0.03 0.05 0.01 0.07 TM1S2N TM1S2N-1 4.22 0.16 27.6 3.76 57.00 TM1S2N-2 4.48 0.19 26.7 3.67 40.49 TM1S2N-3 4.35 0.18 26.5 3.14 37.77 Mean 4.35 0.18 26.9 3.52 45.09 Cov 0.02 0.07 0.02 0.08 0.19 TM2S2N TM2S2N-2 4.09 0.16 27.3 3.55 43.45 TM2S2N-3 4.02 0.15 27.7 4.35 75.15 Mean 4.05 0.16 27.5 3.95 59.30 Cov 0.01 0.02 0.01 0.10 0.27 TM3S2N TM3S2N-1 4.55 0.21 24.1 5.7 45.36 TM3S2N-3 4.71 0.21 24.9 5.7 62.43 Mean 4.63 0.21 24.5 5.7 53.90 Cov 0.02 0 0.02 0 0.16 TM3S2G TM3S2G-1 4.02 0.16 28.7 4.23 43.08 TM3S2G-2 4.06 0.15 28.1 4.51 47.24 TM3S2G-3 4.37 0.18 27.0 5.11 60.20 Mean 4.15 0.16 27.9 4.62 50.17 Cov 0.04 0.06 0.03 0.08 0.15 Notes: σcr—Cracking stress; εcr—Cracking strain; Es—Elastic modulus; σsec—Peak stress at second rise of the stress-strain curve; εu—Ultimate strain. Specimens TM0S2N-2, TM2S0N-2, TM2S2N-1 and TM3S2N-2 were destroyed outside of the measurement section, their data were not listed in the table, and they were not involved in subsequent data analysis; Cov—Coefficient of variation.
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表 5 GRMM弯曲试验结果
Table 5. GRMM bending test results
Specimen grouping Specimen number σcr/MPa δcr/mm σmax/MPa δmax/mm BM0S0N BM0S0N-1 6.15 0.39 6.15 0.39 BM0S0N-2 6.07 0.34 6.07 0.34 BM0S0N-3 6.84 0.26 6.84 0.26 Mean 6.36 0.33 6.36 0.33 Cov 0.07 0.20 0.07 0.20 BM0S2N BM0S2N-1* 9.89 0.33 14.01 0.96 BM0S2N-2 9.18 0.35 19.85 2.51 BM0S2N-3 10.20 0.35 20.24 2.17 Mean 9.69 0.35 20.05 2.34 Cov 0.07 0.00 0.014 0.10 BM2S0N BM2S0N-1 5.92 0.21 23.35 26.13 BM2S0N-2 6.00 0.28 29.04 24.32 BM2S0N-3 6.70 0.29 24.44 19.72 Mean 6.20 0.26 25.61 23.39 Cov 0.07 0.17 0.012 0.14 BM1S2N BM1S2N-1 8.25 0.16 21.88 21.08 BM1S2N-2 7.09 0.23 19.15 23.96 BM1S2N-3 7.17 0.28 18.99 21.26 Mean 7.50 0.22 20.01 22.10 Cov 0.09 0.27 0.08 0.07 BM2S2N BM2S2N-1 6.63 0.32 24.60 27.63 BM2S2N-2 7.70 0.23 24.29 26.69 BM2S2N-3 7.51 0.27 29.89 25.13 Mean 7.28 0.27 26.26 26.48 Cov 0.08 0.16 0.12 0.05 BM3S2N BM3S2N-1 6.85 0.25 31.53 14.17 BM3S2N-2 8.25 0.24 35.34 12.36 BM3S2N-3 7.94 0.24 45.78 15.70 Mean 7.68 0.24 37.55 14.08 Cov 0.10 0.02 0.20 0.12 BM3S2G BM3S2G-1 10.98 0.25 46.95 11.98 BM3S2G-2 9.42 0.18 36.12 11.43 BM3S2G-3 9.65 0.21 31.30 11.60 Mean 10.02 0.21 38.12 11.67 Cov 0.08 0.16 0.21 0.02 Notes: δcr—Cracking deflection; σmax—Bending strength; δmax—Ultimate deflection. Since the uneven distribution of steel fibers affected the bending strength of specimen, BM0S2N-1* was not involved in the calculation of subsequent analysis.
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