Whisker-Reinforced Repairing Mortar for High-Speed Railway Concrete
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摘要:
为满足高铁混凝土修补砂浆性能需求，制备不同掺量硅灰石晶须硫铝酸盐水泥砂浆，测试其抗折强度、抗压强度和收缩率，并采用X-射线衍射仪（XRD）、扫描电子显微镜（SEM）进行表征观察. 研究结果表明：砂浆强度随硅灰石晶须掺量增加先增大后减小，在掺量为10.0%时，抗折强度、抗压强度均达到最大值，收缩率最小；掺量不大于10.0%时，砂浆强度提高，收缩率减小，主要归因于晶须拔出、断裂、桥接作用和晶须-水泥共同拔出，而受晶须对水泥水化反应影响较小；掺量过大，晶须发生团聚增大砂浆孔隙，反而导致强度降低；硫铝酸盐水泥砂浆掺入适量晶须，可改善修补砂浆多方面性能，具有用作高铁混凝土修补材料的潜质.
Abstract:To meet the performance requirements of repairing mortar for high-speed railway concrete, sulfoaluminate cement mortars with different contents of wollastonite whisker were prepared. Their flexural strength, compressive strength, and shrinkage were tested, and they were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the mortar strength increases initially and then decreases with the increase in the wollastonite whisker content. At a content of 10.0%, mortar exhibits the maximum flexural strength and compressive strength and the minimal shrinkage. When the content is not greater than 10.0%, the improvement in strength and reduction in shrinkage are mainly attributed to the pullout, fracture, and bridging effects of the whiskers, as well as the cooperative pullout of whiskers and cements. The influence of whiskers on the cement hydration reaction is minimal. When the content is too high, the whiskers can aggregate to amplify the pore size of the mortar, resulting in a decrease in strength. In summary, the addition of an appropriate amount of whiskers can improve the multi-faceted performance of repairing mortar, showing potential for application in high-speed railway concrete repair.
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Key words:
- whisker /
- sulfoaluminate cement /
- repairing mortar /
- high-speed railway /
- flexural strength
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图 2 不同硅灰石晶须掺量的铝酸盐水泥砂浆收缩率
Figure 2. Shrinkage of sulphoaluminate cement mortars with different wollastonite whisker contents
图 3 不同硅灰石晶须掺量的铝酸盐水泥砂浆抗折强度
Figure 3. Flexural strength of sulphoaluminate cement mortars with different wollastonite whisker contents
图 4 不同掺量硅灰石晶须硫铝酸盐水泥砂浆抗压强度
Figure 4. Compressive strength of sulphoaluminate cement mortars with different wollastonite whisker contents
图 6 不同硅灰石晶须掺量的硫铝酸盐水泥净浆各龄期下的XRD图谱及Ig/Is比值
Figure 6. XRD Patterns and Ig/Is ratios of sulfoaluminate cement pastes with different wollastonite whisker contents at various ages
图 7 掺入硅灰石晶须的硫铝酸盐水泥砂浆横断面SEM图
Figure 7. SEM Images of cross-sections of sulfoaluminate cement mortar incorporating wollastonite whiskers
表 1 硫铝酸盐水泥基本性能
Table 1. Basic properties of sulphoaluminate cement
安定性 凝结时间/min 抗折强度/MPa 抗压强度/MPa 初凝 终凝 1 d 7 d 28 d 1 d 7 d 28 d 良好 24 30 6.03 7.28 8.12 38.89 42.11 57.57 
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表 2 标准砂粒径分布
Table 2. Particle size distribution of standard sand
筛孔边长/mm 2.00 1.60 1.00 0.50 0.16 0.08 累计筛余/% 0 7±5 33±5 67±5 87±5 99±1
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表 3 硅灰石晶须基本性能指标
Table 3. Basic performance indicators of wollastonite whiskers
密度/（g·cm−3） 长度/μm 宽度/μm 水溶/
（g·100 mL−1）膨胀系数 0.34 480.8 24.2 0.0095 6.5 × 10−6
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表 4 不同硅灰石晶须掺量的硫铝酸盐水泥砂浆配合比
Table 4. Mix proportions of sulphoaluminate cement mortars with different amounts of wollastonite whiskers
g 试样编号 水 水泥 标准砂 硅灰石晶须 WFA0 211.5 450 1350.00 0 WFA5.0 211.5 450 1327.50 22.50 WFA7.5 211.5 450 1316.25 33.75 WFA10.0 211.5 450 1305.00 45.00 WFA12.5 211.5 450 1293.75 56.25 WFA15.0 211.5 450 1282.50 67.50
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