沥青混凝土路面裂缝灌浆材料性能与工艺研究

发布时间：2018-09-05 12:37

【摘要】：裂缝是沥青路面常见病害之一,传统的沥青路面修补方法多为表面填封,失效率较高,因此,开展沥青路面裂缝灌浆材料技术与工艺研究对于提高路面使用寿命,降低路面维修养护成本具有重要意义。本文通过研究不同PU(聚氨酯预聚体)掺量下EA/PU IPN灌浆材料的基本性能以及灌浆材料与沥青混凝土组合体系与沥青混凝土之间的性能对比,评价灌浆材料的修补效果；通过研究传统的沥青路面裂缝修补方法,结合灌浆材料性能特点,提出一套更为有效的沥青路面裂缝修补施工工艺。主要研究内容如下： (1)通过调节EA/PU IPN灌浆材料中的PU掺量(10%-60%),考察灌浆材料的基本性能。研究结果表明：当PU掺量为30%-60%时,灌浆材料性能较符合沥青混凝土修补用。此时灌浆材料韧性较好,断裂伸长率在30%-40%左右,也同时强度也较高,体积收缩率较小,大约为3%。 (2)通过调节EA/PU IPN灌浆材料中的PU掺量(30%-60%),考察灌浆材料与沥青混凝土组合体系的变形协调性和粘结性。研究结果表明：剪切试验中,随着PU掺量的增加,组合体系剪切强度总体呈上升趋势；当PU掺量较低时,随着裂缝宽度的增加,组合体系剪切强度呈上升趋势；当PU掺量较高时,随着裂缝宽度的增加,组合体系剪切强度先下降后上升；裂缝宽度对于剪切强度的影响较小。磨耗试验中,随着PU掺量的增加,组合体系质量曲线逐渐向原试件质量曲线靠近。裂缝宽度对于磨耗试验的影响较小。劈裂抗拉试验中,随着PU掺量的增加,组合体系劈裂抗拉强度呈上升趋势,且趋近于原试件的劈裂抗拉强度；组合体系破坏劲度模量呈上升趋势,且趋近于原试件的破坏劲度模量；组合体系应力应变曲线趋近于原试件应力应变曲线。当PU掺量为50%和60%时,灌浆材料具有较好的粘结性,并且和沥青混凝土之间具有较好的变形协调性。 (3)结合所研究的灌浆材料的性能,改进了传统的施工工艺,使之更为有效,提高了施工效率。
[Abstract]:Crack is one of the common diseases of asphalt pavement. The traditional repair method of asphalt pavement is surface sealing, and the failure rate is high. Therefore, the research of asphalt pavement crack grouting material technology and technology can improve the service life of asphalt pavement. It is of great significance to reduce the cost of pavement maintenance and maintenance. In this paper, the basic properties of EA/PU IPN grouting materials under different PU (polyurethane prepolymer) content and the performance comparison between grouting materials and asphalt concrete composite systems and asphalt concrete are studied to evaluate the repair effect of grouting materials. By studying the traditional asphalt pavement crack repair method and combining the characteristics of grouting material, a more effective construction technology of asphalt pavement crack repair is put forward. The main contents are as follows: (1) the basic properties of EA/PU IPN grouting materials were investigated by adjusting the PU content (10- 60%). The results show that when the content of PU is 30%-60%, the performance of grouting material is better than that of asphalt concrete repair. At the same time, the toughness of the grouting material is better, the elongation at break is about 30-40%, the strength is also higher, and the volume shrinkage is smaller. (2) by adjusting the content of PU in EA/PU IPN grouting material (30-60%), the deformation compatibility and adhesion of the composite system of grouting material and asphalt concrete are investigated. The results show that the shear strength of composite system increases with the increase of PU content in shear test, and the shear strength of composite system increases with the increase of crack width when the content of PU is low. When the content of PU is high, the shear strength of composite system decreases first and then increases with the increase of crack width, and the influence of crack width on shear strength is small. In the wear test, with the increase of PU content, the mass curve of the composite system is closer to that of the original specimen. The crack width has little effect on the wear test. In the splitting tensile test, with the increase of PU content, the splitting tensile strength of the composite system tends to increase, which is close to the splitting tensile strength of the original specimen, and the modulus of failure stiffness of the composite system shows an upward trend, and the tensile strength of the composite system increases with the increase of the content of PU. The stress-strain curve of the composite system is closer to the stress-strain curve of the original specimen. When the content of PU is 50% and 60%, the grouting material has better adhesion and better deformation compatibility with asphalt concrete. (3) the traditional construction technology is improved by combining the performance of the grouting material studied. Make it more effective, improve the construction efficiency.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414;U416.2

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