| 摘要: |
| 为研究聚乙烯醇（PVA）纤维的分散程度对水泥砂浆和水泥稳定碎石性能的影响，用粉煤灰对PVA纤维束进行分散处理，同时采用灰度共生矩阵图像处理法对PVA纤维的图像纹理进行熵分析，建立单因素方差分析数学模型，用以检验粉煤灰对PVA纤维分散程度的显著性影响，得出PVA纤维的分散程度与图像熵之间的关系；然后采用质量均分称重法对灰度共生矩阵图像处理法进行验证分析；再通过室内试验研究水泥基复合材料的力学性能与PVA纤维分散程度之间的关系.结果表明：PVA纤维的分散程度随着添加的粉煤灰与PVA纤维质量比（简称质量比）的增加而增大，当质量比大于50∶1时，PVA纤维束能在水泥基复合材料中均匀分散；图像熵随质量比的增加而增加，纤维均值的变异系数随质量比的增加而减小；水泥砂浆的抗折强度、破裂能和水泥稳定碎石的劈裂强度随图像熵的增加而增大.由此可知，提升PVA纤维在水泥砂浆和水泥稳定碎石中的分散程度，可提升水泥砂浆和水泥稳定碎石的力学性能. |
| 关键词: 水泥砂浆 水泥稳定碎石 分散程度 破裂能 劈裂强度 |
| DOI：10.3969/j.issn.1007-9629.2021.05.004 |
| 分类号:TU528.01 |
| 基金项目:云南省交通科技基金项目（2018-23）；安徽省交通科技基金项目 （Ahjtkj20130051）；重庆交通大学山区桥梁结构与材料教育部工程研究中心开放基金资助（QLGCZX-JJ2017-2） |
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| Effect of PVA Fibers Dispersion on Mechanical Properties of Cement Mortar and Cement Stabilized Macadam |
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YUAN Lingqing1,2, LIANG Naixing2, ZHAO Chunhua3, YANG Zhuolin2, ZENG Sheng4
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1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education，Tongji University， Shanghai 201804， China;2.School of Civil Engineering， Chongqing Jiaotong University， Chongqing 400074， China;3.School of Civil Engineering and Architecture， Chongqing University of Science and Technology， Chongqing 401331， China;4.School of Materials Science and Engineering， Chongqing Jiaotong University， Chongqing 400074， China
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| Abstract: |
| In order to study the influence of the dispersion degree of polyvinyl alcohol（PVA） fibers on the properties of cement mortar and cement stabilized macadam， fly ash was used to disperse PVA fibers. Entropy analysis of the image texture of PVA fibers was carried out by the image processing method of gray level co-occurrence matrix， and the mathematical model of single-factor analysis of variance was established to test the significant influence of fly ash on the dispersion degree of PVA fibers， the relationship between the dispersion degree of PVA fibers and the image entropy was obtained. Then the image processing method of gray level co-occurrence matrix was verified and analyzed by the mass-equipartition weighing method. The relationship between the mechanical properties of the cement-based composite material and the dispersion degree of PVA fibers were studied through laboratory experiment. The results show that the dispersion degree of PVA fibers increases with the increase of the mass ratio of fly ash and PVA fibers （abbreviated as mass ratio）， when the mass ratio is greater than 50∶1， the PVA fibers can be uniformly dispersed in the cement-based composite material. The image entropy increases with the increase of mass ratio， and the coefficient of variation of fiber decreases with the increase of mass ratio. The flexural strength， fracture energy of cement mortar and splitting strength of cement stabilized macadam increase with the increase of the image entropy. Increasing the dispersion degree of PVA fibers in cement mortar and cement stabilized macadam can improve the mechanical properties of cement mortar and cement stabilized macadam. |
| Key words: cement mortar cement stabilized macadam dispersion degree fracture energy splitting strength |
