【作者】 李小燕；

【导师】 高培伟；

【作者基本信息】 南京航空航天大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 机场道面在长期自然环境以及飞机荷载的共同作用下,会出现大量宽度在0.2mm左右的微裂缝,如果不及时修补,在冲击荷载及外部侵蚀介质的反复作用下,这种微裂缝会不断扩展、加剧,降低机场道面的使用寿命,影响飞行安全。为此,本文研制了新型机场道面微裂缝修补材料,该修补材料具有良好的流动性和可灌性,能自行渗入到微裂缝深处,具备强度高、变形小、粘结性好等特点。本文主要对影响新型修补材料合成的各种因素以及各项性能进行了系统的研究,主要内容包括:(1)探讨了合成温度、合成时间、助剂B和助剂C的用量对新型修补材料初始粘度和转化率的影响,以及粘度和可灌性的关系。研究表明,合成温度提高,修补材料的粘度会较早发生变化,增长速度也加快;合成时间增加,修补材料的粘度增加相对较大;修补材料的粘度随助剂B用量的增加呈线性增大,随助剂C用量的增加呈上升趋势;修补材料的粘度随存放时间的延长有一定的增加,增幅与初始粘度的大小成正比关系;修补材料的粘度和可灌性之间成反比关系。(2)研究了固化剂D及其与不同无机填料复合对修补材料力学性能和变形性能的影响。研究发现,在小变形范围内,添加固化剂D和无机填料的修补材料的拉伸性能优于只添加固化剂D时的拉伸性能,且无机填料Wa和固化剂D复合对修补材料拉伸性能的改善效果较好;固化剂D和无机填料复合后修补材料抗弯曲变形的能力有所下降,但抗弯曲荷载的能力有所提高;无机填料可改善新型修补材料的收缩变形性能,提高修补材料的粘结强度。(3)测试了新型修补材料在紫外光照射和NaCl溶液侵蚀作用下的拉伸和弯曲性能,结果发现两种性能均有一定程度的下降,但无机填料的掺入可减少其降低程度。(4)通过对新型修补材料的微观试验分析,发现基准修补材料与砂浆界面之间存在较为明显的过渡区,过渡区的结构松散,与砂浆的粘结较弱;掺加固化剂D后,修补材料密实,修补界面区有了一定的改善;掺加固化剂D和无机填料Wa后,修补材料的填充作用更加显著,无明显的缝隙存在,粘结面积增大,结构更加密实,过渡区细化,粘附力增强,粘结强度提高。更多还原

【Abstract】 Under the long-term effects of natural environment and aircraft load on the airport runway, cracks with the width of 0.2mm inevitably occurred in the pavement. If not mended in time, cracks would easily become the approaches for the external corrosives to invade into the concrete, and would enlarge quickly under the impact load. The developing cracks would deteriorate the concrete, shorten the service lifetime of the airport runway, and threaten the flight safety. Therefore, a new type of repair material for micro-crack of airport runway has been prepared, which has low viscosity, good irrigation performance, high tensile and bending strength and high bonding strength with concrete, etc.The factors effecting the synthesizing of the repair material and the corresponding performances have been studied. The main contents of the paper were summarized as follows:(1) The influence of synthesis temperature, synthesis time, and the content of additive B and additive C on the initial viscosity and the conversion rate of the new-type repair material have been investigated. The relationship of viscosity and irrigation property was also analyzed. The test results showed that:①the higher the synthesis temperature is, the earlier and faster the viscosity changes;②the longer the synthesis time is, the greater the viscosity increases;③the viscosity improves linearly with the increasing content of additive B and increases significantly with the increasing content of additive C. Besides, the viscosity increases with the prolonging of placement time, and the increase extent is in direct ratio with the initial viscosity. The irrigation property is in inverse ratio with the initial viscosity.(2) The bending and tensile strength and deformation performance of the new-type crack repair material with the addition of curing agent D, curing agent D and mineral filler were tested. In the extent of small deformation, curing agent D and mineral filler could contribute to improve the tensile performance. What is more, the tensile strength of repair material with curing agent D and mineral filler named as“Wa”was much better than that of others. After the addition of the curing agent D and mineral filler, the bending deformation performance of repair material reduced, but the resistance of bending load enhanced. The using of mineral filler could also reduce the shrinkage of repair material and improve the bonding strength of it.(3) When the specimens of repair materials were exposed in the irradiation of UV-light and dug into 5% NaCl (mass ratio) solution for one month, the tensile and bending strength of repair material decreased, and the mineral filler could make the strength reduce less.(4) Based on the microcosmic experiments, it was shown that there was an obviously incompact transition region on the interface between initial repair material and mortar, and that the bonding condition was not very good. The modified repair material became close-grained and the bonding strength enhanced when the curing agent D added. After the addition of curing agent D and mineral filler named as“Wa”, the filling effect of the modified repair material was more significant, and the bonding strength became higher, which could greatly enhance the performance of cracked airport runway.更多还原