环氧改性聚氨酯材料在半刚性基层沥青路面既有裂缝修复中的应用研究

发布时间：2018-12-13 12:51

【摘要】：在我国公路建设中,沥青混凝土路面凭借其表面平整、无接缝、行车舒适、噪音低、振动小以及修复容易等特点所占比例逐渐加大,尤其是半刚性基层沥青路面。然而由于交通量和轴载的不断增大,路面裂缝问题日趋严重。目前我国半刚性基层沥青路面裂缝的修补技术主要以填缝或者抗裂贴封缝为主,耐久性差且失效率较高,因此对半刚性基层沥青路面裂缝修复技术的研究具有重要意义。本文依托湖南省某高速公路沥青路面实体工程,从路面裂缝修复材料自身性能、病害的诊断分析以及最终的施工技术方案的确定,提出一套行之有效的裂缝修复处治流程。主要研究内容如下：①通过对环氧改性聚氨酯材料自身性能的试验研究,考察其物理化学特性、抗拉强度和伸长率、粘接强度,结果表明：材料具有较好的膨胀性和抗渗透性,通过对固化物抗拉强度和伸长率试验,表明该裂缝修复材料具有较强的抗拉强度和较好的延展性。对环氧改性聚氨酯材料进行干粘接和湿粘接的试验分析,该裂缝修复材料具有良好的施工适应性。②对半钢性基层裂缝修复效果进行试验研究,结果表明：经环氧改性聚氨酯材料修复后水泥稳定碎石试件具有较大的抗压和弯拉强度；修复后自由收缩状态下水稳基层的收缩性能较好。裂缝修复后组合结构马歇尔试件残留稳定度并未有明显下降,其残留稳定度为85.4%,达到标准马歇尔试件的95.2%,；裂缝修复后组合结构冻融劈裂抗拉强度比为83.02%,原状试件为85.19%,裂缝修复后试件TSR达到了原状试件的97.5%；在低温条件下组合结构体系与原状试件最大弯拉应变较为接近,在压力作用下裂缝修复材料与沥青混合料协调变形,可见在低温条件下路面裂缝修复结构抵抗弯曲开裂性能较好。③针对实体工程及修复方法的特点,提出了一套合理、高效的压力注浆修复裂缝的施工工艺。通过施工结束后路面所取芯样的一系列试验分析,结果表明经压力注浆修复裂缝施工后路面修复效果较好。
[Abstract]:In the highway construction of our country, the proportion of asphalt concrete pavement is gradually increasing by virtue of its smooth surface, no joint, comfortable driving, low noise, small vibration and easy to repair, especially semi-rigid base asphalt pavement. However, due to the increasing traffic volume and axle load, the pavement crack problem is becoming more and more serious. At present, the crack repair technology of semi-rigid base asphalt pavement in China is mainly composed of filling joint or anti-crack sealing joint, with poor durability and high failure rate, so it is of great significance to study the crack repair technology of semi-rigid base asphalt pavement. Based on a concrete project of asphalt pavement of a highway in Hunan province, this paper puts forward a set of effective crack repair and treatment process from the aspects of pavement crack repair material's own performance, disease diagnosis and analysis and final construction technical plan determination. The main research contents are as follows: 1 the physical and chemical properties, tensile strength and elongation, adhesive strength of epoxy modified polyurethane were investigated. The results showed that the material had good expansibility and permeability resistance. The tensile strength and elongation of the solidified compound show that the crack repair material has strong tensile strength and good ductility. The experimental analysis of epoxy modified polyurethane material for dry bonding and wet bonding shows that the crack repair material has good construction adaptability. 2 the effect of repairing cracks on semi-steel base is studied experimentally. The results show that the cement stabilized macadam specimens repaired with epoxy modified polyurethane have high compressive strength and flexural tensile strength. After repair, the free shrinkage state is better. After fracture repair, the residual stability of composite structure Marshall specimen did not decrease obviously, and its residual stability was 85.4, which reached the standard Marshall specimen 95.2%. The ratio of freeze-thaw splitting tensile strength is 83.02, and the original specimen is 85.190.After the crack repair, the TSR of the composite structure is 97.5. At low temperature, the maximum bending tension strain of the composite structure system is close to that of the original specimen, and the crack repairing material and the asphalt mixture are deformed harmoniously under pressure. It can be seen that the pavement crack repair structure has good resistance to bending cracking under low temperature. 3 according to the characteristics of solid engineering and repair method, a set of reasonable and efficient construction technology for repairing crack with pressure grouting is put forward. Through a series of tests and analysis of the core samples taken from the pavement after construction, the results show that the pavement repair effect is better after the construction of cracks repaired by pressure grouting.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.217;U418.6

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