SMA路面设计与施工质量过程控制研究

发布时间：2018-07-08 12:24

本文选题：施工现场 + SMA配合比　；参考：《西安工业大学》2017年硕士论文

【摘要】：近年,我国车辆数量的迅速增长,对路面质量的要求也不断提升,同时对高速公路建设以及公路的寿命也提出了更高的要求。上面层质量的好坏对路面质量的好坏有着举足轻重的作用。路面上面层级配设计、结构选择及施工控制等方面直接影响着道路的整体性能。本文以杭新景高速第二十二标段的实体工程为依托,以SMA-13配合比设计为切入点,通过原材料性能试验、矿料配合比计算、油石比确定等步骤进行SMA-13设计,并对设计结果各方面的性能进行验证。根据SMA配合比设计结果,通过有差别的成型方式、击实次数进行试件成型试验,通过对不同成型方法下集料的特性、沥青混合料的体积参数、集料骨架形成情况、集料破碎情况等进行对比分析,并利用抽屉筛分的方法对集料的破碎情况进行精确的数据收集,分析马歇尔不同压实功下集料的破碎情况,进而对室内成型方式提出建议,同时通过对集料破碎情况的研究分析SMA-13的主要承重石料粒径范围。由于地理及其他方面因素的影响,浙江地区高速公路的沥青混合料普遍采用3mm-5mm的石灰岩代替玄武岩,考虑到石灰岩是碱性集料且SMA规范中提到,在没有专用的细集料破碎机生产的机制砂的情况下可以选用普通石灰岩石屑代替以保证集料和沥青的粘附性。以此出发,结合工程项目中更具代表性的AC-13C配合比对石灰岩替换玄武岩(2.36mm-4.75mm)进行替换试验。结果表明在其他性能都满足规范要求的情况下,石灰岩替换组具有更好的48小时浸水马歇尔稳定度和冻融劈裂指标。该试验一方面证明了 SMA中2.36mm-4.75mm档石灰岩替换的可行性,另一方面也为该地区普遍存在的以2.36-4.75mm石灰岩替换做法提供了一定的依据。最后,以上述试验结果为依据,总结试验段铺设的问题,对SMA-13的现场的机械设备、施工工艺提出建议并对施工过程中出现的问题给出处理措施,同时通过试验段路段芯样的各项数据与试验室试件得出的数据对比,再次证明较好成型方式的合理性。
[Abstract]:In recent years, with the rapid growth of the number of vehicles in our country, the requirements for the quality of the road surface have been continuously raised, and higher requirements have also been put forward for the construction of highways and the service life of highways. The quality of the top layer plays an important role in the quality of the pavement. The gradation design, structure selection and construction control of pavement surface have a direct impact on the overall performance of the road. In this paper, based on the solid engineering of the 22 section of Hangzhou Xinjing Expressway, the SMA-13 mix proportion design is taken as the breakthrough point, and the SMA-13 design is carried out through the raw material performance test, the calculation of the mixture ratio of the mineral aggregate and the determination of the oil-stone ratio. The performance of the design results is verified. According to the results of SMA mix ratio design, through different molding methods, compaction times to carry out the sample forming test, through the different forming methods of the characteristics of aggregate, asphalt mixture volume parameters, aggregate skeleton formation, The crushing situation of aggregate is compared and analyzed, and the crushing situation of aggregate is collected accurately by the method of drawer sieving, and the crushing situation of aggregate under different compaction work of Marshall is analyzed. At the same time, the particle size range of the main bearing stone SMA-13 is analyzed by studying the crushing condition of aggregate. Due to the influence of geography and other factors, the asphalt mixture of expressway in Zhejiang area generally uses limestone from 3mm-5mm instead of basalt, considering that limestone is alkaline aggregate and mentioned in SMA code. When there is no special fine aggregate crusher to produce the machine-made sand, ordinary limestone debris can be used instead to ensure the adhesion between aggregate and asphalt. Based on this, the replacement test of limestone replacement basalt (2.36mm-4.75mm) is carried out in combination with AC-13C mixture ratio, which is more representative in engineering projects. The results show that the limestone replacement group has a better stability of 48 hours immersion Marshall and a better index of freeze-thaw splitting under the condition that other properties meet the requirements of the specifications. On the one hand, this experiment proves the feasibility of 2.36mm-4.75mm limestone replacement, on the other hand, it provides a basis for the 2.36-4.75mm limestone replacement. Finally, on the basis of the above test results, the problems of laying the test section are summarized, and some suggestions on the field mechanical equipment and construction technology of SMA-13 are put forward, and the treatment measures for the problems in the construction process are given. At the same time, by comparing the data of the core sample of the test section with the data obtained from the laboratory specimen, the rationality of the better molding method is proved again.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.2

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