浇注式沥青混合料配合比设计及性能研究

发布时间：2018-05-31 16:17

本文选题：浇注式沥青混凝土 + 配合比设计　；参考：《重庆交通大学》2015年硕士论文

【摘要】：近年来,我国的基础设施建设进展迅猛,一大批大跨径钢桥相继建成。伴随着大跨径钢桥的广泛使用,桥面铺装也逐渐显示出它的重要性。浇注式沥青混凝土因其良好的防水性能、抗疲劳性能、抗老化性能以及对于钢桥面良好的随从性,在国内外得到广泛使用。当前我国浇注式沥青混合料的设计方法与国外类似,合成级配后通过经验用油量进行试拌,根据性能指标挑选合理的沥青含量。尽管这种设计方法在国内外有着充足的使用经验,且能基本保证工程需要,但此方法使得混合料体积特征不明显,内部结构不清晰,同时浇筑式沥青混合料性能指标较少,仅仅通过混合料性能指标来判定沥青用量存在一定风险。本文依托于重庆永川长江大桥浇注式沥青混凝土性能研究以及桥面铺装工程实施研究,对体积设计法进行了初步的探索,采用经验设计法进行桥面铺装设计,并辅以流动性研究,最后通过工程实施得到如下结论:①采用体积法设计混合料,通过土工击实的方法求出合成级配矿料间隙率,从而确定沥青用量,使得沥青用量的确定更有依据;②2.36mm筛孔通过率是GA10粗细分界筛孔,通过调整2.36mm筛孔的通过率能够有效改善浇注式沥青混合料的高温稳定性,同时0.075mm筛孔通过率能够更为显著的影响GA10路用性能和施工和易性;③不同种类沥青条件下GA10性能试验结果表明,沥青粘度较大时,依据体积法确定的沥青用量不一定满足要求,这个时候可以考虑以0.3%变动沥青用量进行试验,从而挑选出最佳沥青用量;④浇注式沥青混合料的流动度主要受沥青胶浆数量和粘度影响,沥青胶浆数量越多、粘度越低,则流动性越好,流动性亦会由于沥青的老化而急剧下降。⑤通过实际工程施工得到的检测数据显示,采用经验设计法设计的混合料流动性可以满足施工要求,现场取样后成型贯入度试件,并检测高温性能,结果表明满足设计要求,且高温性能良好。
[Abstract]:In recent years, the construction of infrastructure in China has made rapid progress, a large number of long-span steel bridges have been built. With the wide use of long-span steel bridges, deck pavement has gradually shown its importance. Pouring asphalt concrete has been widely used at home and abroad because of its good waterproofing, fatigue resistance, aging resistance and good compliance to steel bridge deck. At present, the design method of pouring asphalt mixture in our country is similar to that in foreign countries. After synthetic gradation, the mixture is mixed with experience oil quantity, and the reasonable asphalt content is selected according to the performance index. Although this design method has sufficient experience at home and abroad, and can basically guarantee the engineering needs, but this method makes the volume characteristics of the mixture not obvious, the internal structure is not clear, and the performance index of the pouring asphalt mixture is less. Only through the mixture performance index to determine the asphalt content there is a certain risk. Based on the research on the performance of pouring asphalt concrete of Yongchuan Yangtze River Bridge in Chongqing and the implementation of bridge deck pavement engineering, the volume design method is preliminarily explored, and the empirical design method is used to design the deck pavement. With the aid of fluidity research, the following conclusions are obtained through engineering implementation: 1. The volume method is used to design the mixture, and the voids of synthetic graded mineral aggregate are calculated by the method of geotechnical compaction, so as to determine the asphalt content. It makes the determination of asphalt dosage more reliable that the pass rate of GA10 22.36mm sieve hole is the GA10 thick and fine boundary sieve hole. By adjusting the passing rate of 2.36mm sieve hole, the high temperature stability of pouring asphalt mixture can be improved effectively. At the same time, the passing rate of 0.075mm sieve hole can significantly affect the road performance and construction of GA10 and the test results of GA10 performance under different kinds of bitumen. The results show that the asphalt content determined by volume method does not meet the requirements when the viscosity of asphalt is high. At this time, we can consider using 0.3% varying asphalt dosage to test, and then select the best asphalt content of the pouring asphalt mixture flow degree is mainly affected by the quantity and viscosity of asphalt slurry, the more the quantity of asphalt slurry, the lower the viscosity, the more the quantity of asphalt slurry is, the lower the viscosity is. The better the fluidity, the faster the fluidity will be due to the aging of asphalt. 5. The testing data obtained from the actual engineering construction show that the flowability of the mixture designed by the empirical design method can meet the construction requirements. The high temperature performance is tested and the results show that the design requirements are satisfied and the high temperature performance is good.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

【参考文献】