Bending Properties of Polypropylene Fiber-Sulfoaluminate Cement-Based Repair Material Using Grey Relation Theory
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摘要:
为提高水泥基增强复合材料（ECC）经济效益并控制修复周期，以较低成本的聚丙烯纤维和快硬早强硫铝酸盐水泥为关键组材，设计聚丙烯纤维硫铝酸盐水泥基（PP-SACC）修复材料，并探究水胶比、纤维掺量及骨料粒径对修复材料弯曲性能的影响规律，联用灰色关联模型对PP-SACC各工况进行综合评价. 研究结果表明：纤维掺量是影响强度、韧性及裂缝特性最重要的因素，纤维掺量对初裂强度、韧性指标及平均裂缝宽度的影响因子分别为 −0.68、0.79和 −0.98；骨料粒径对裂缝特性同样有明显的影响，石英砂尺寸对平均裂缝宽度的影响因子为 −0.86；水胶比对强度和韧性也有着显著的影响，合理的水胶比更有利于充分发挥纤维的桥连效应；PP-SACC修复材料在具备优异韧性的同时具有挠曲硬化特性.
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关键词:
- PP纤维-硫铝酸盐水泥基修复材料 /
- 弯曲延性 /
- 挠曲硬化 /
- 改进灰色关联分析
Abstract:To improve the economic benefits of engineered cementitious composite (ECC) and control the repair cycle, the polypropylene fiber-sulfoaluminate cement-based (PP-SACC) repair materials were designed with polypropylene fiber featuring low cost and sulfoaluminate cement featuring fast hardening and early strength employed as the key components. The influence of water-binder ratio, fiber content, and aggregate size on the bending properties of the repair materials was explored. In addition, the grey relation model was used to comprehensively evaluate PP-SACC under all working conditions. The results indicate that the fiber content is the most important factor that affects the strength, toughness, and crack characteristics. The influence factors of fiber content on initial crack strength, toughness index, and average crack width are −0.68, 0.79, and −0.98, respectively. The aggregate size can significantly affect the crack characteristics. The influence factor of quartz sand size on the average crack width is −0.86. The water-binder ratio also greatly affects the strength and toughness, and a reasonable water-binder ratio is beneficial to leverage the bridging effect of the fiber. The PP-SACC repair material has excellent toughness and flexural hardening properties.
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图 3 各工况弯曲荷载-跨中挠度曲线
Figure 3. Mid-span deflection-bending load curves under all working conditions
图 4 各工况收缩变形随龄期变化
Figure 4. Shrinkage deformation variations under all working conditions with curing age
表 1 快硬硫铝酸盐水泥的化学成分组成
Table 1. Chemical compositions of fast-hardening sulfoaluminate cement
% 成分 质量分数 成分 质量分数 CaO 47.4 SO3 12.3 Al2O3 23.5 MgO 4.4 SiO2 10.1 Fe2O3 2.3 
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表 2 微珠化学成分组成
Table 2. Chemical compositions of cenosphere
% 成分 质量分数 成分 质量分数 SiO2 56.6 Fe2O3 5.3 CaO 4.8 Na2O 1.4 MgO 1.3 K2O 3.3 Al2O3 26.5 SO3 0.8
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表 3 PP纤维物性参数
Table 3. Physical properties of PP fibers
参数 断裂强度/MPa 当量直径/μm 纤维长度/mm 初始弹性模量/GPa 断裂伸长率/% 取值 630 25.46 12 7.1 25.2
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表 4 PP-SACC各工况基本配合比
Table 4. Mix proportions of PP-SACC under all working conditions
试件编号 水胶比 骨料粒径/μm 纤维掺量/% 修复材料流动度/mm 基体流动度/mm A1-2.5 0.40 75 2.5 216 173 A1-3.0 0.40 75 3.0 196 A-2.5 0.40 160 2.5 211 230 A-3.0 0.40 160 3.0 183 B1-2.5 0.30 75 2.5 181 119 B1-3.0 0.30 75 3.0 165 B-2.5 0.30 160 2.5 173 123 B-3.0 0.30 160 3.0 137 C1-2.5 0.25 75 2.5 162 104 C1-3.0 0.25 75 3.0 150 C-2.5 0.25 160 2.5 171 118 C-3.0 0.25 160 3.0 155
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表 5 各工况初裂强度值
Table 5. Initial crack strengths under all working conditions
MPa 编号 初裂强度 编号 初裂强度 A1-2.5 4.56 B-2.5 8.74 A1-3.0 5.06 B-3.0 6.31 A-2.5 4.59 C1-2.5 8.44 A-3.0 4.32 C1-3.0 8.32 B1-2.5 6.79 C-2.5 8.44 B1-3.0 5.73 C-3.0 8.14
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表 6 各工况四点弯曲开裂行为
Table 6. Cracking behavior of four-point bending under all working conditions
编号 平均裂缝
宽度/mm根数/根 编号 平均裂缝
宽度/mm根数/根 A1-2.5 0.240 6.33 B-2.5 0.230 6.00 A1-3.0 0.140 14.67 B-3.0 0.210 5.33 A-2.5 0.190 5.67 C1-2.5 0.190 7.33 A-3.0 0.470 1.67 C1-3.0 0.490 3.00 B1-2.5 0.290 4.67 C-2.5 0.230 8.33 B1-3.0 0.190 11.67 C-3.0 0.250 3.67
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表 7 各工况弯曲韧性指标
Table 7. Toughness indexes under all working conditions
编号 I5 I10 I20 I40 A1-2.5 3.82 7.49 17.14 33.13 A1-3.0 4.11 8.15 16.91 35.8 A-2.5 4.43 8.99 18.99 39.88 A-3.0 4.32 8.56 18.31 38.17 B1-2.5 3.74 7.14 15.79 32.92 B1-3.0 4.33 8.77 18.65 40.29 B-2.5 3.80 7.59 15.84 33.96 B-3.0 4.22 8.49 17.76 38.40 C1-2.5 4.12 8.23 17.30 39.11 C1-3.0 3.58 7.14 17.05 36.97 C-2.5 3.91 7.46 16.49 32.81 C-3.0 3.72 7.55 17.92 29.69
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表 8 反应弯曲性能指标关联度
Table 8. Correlation of bending property indexes
影响因子 I40 平均裂缝宽度 初裂强度值 水胶比 0.7321 0.6531 − 0.8558 骨料粒径 − 0.2364 − 0.8583 − 0.2188 纤维掺量 0.7947 − 0.9843 − 0.6774
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表 9 PP-SACC各工况性能测试结果汇总
Table 9. Test results of PP-SACC under all working conditions
组号 I40 平均裂缝
宽度/mm初裂强度
值/MPaA1-2.5 33.13 0.237 4.56 A1-3.0 35.80 0.137 5.06 A-2.5 39.88 0.194 4.59 A-3.0 38.17 0.475 4.32 B1-2.5 32.92 0.292 6.79 B1-3.0 40.29 0.193 5.73 B-2.5 33.96 0.233 8.74 B-3.0 38.40 0.206 6.31 C1-2.5 39.11 0.193 8.44 C1-3.0 36.97 0.491 8.32 C-2.5 32.81 0.231 8.44 C-3.0 29.69 0.250 8.14
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