TLA改性沥青混合料性能及工程应用研究

发布时间：2018-01-03 13:13

本文关键词：TLA改性沥青混合料性能及工程应用研究　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着我国经济和现代公路运输业的迅速发展,交通量迅猛增长,重载、超载情况严重,交通渠化日趋明显,沥青路面的病害日趋严重,对沥青路面的要求也越来越高。利用改性沥青技术来提高沥青和沥青混合料性能的手段便走进了人们的视野并得到了越来越多的重视。首先,为了保证TLA改性沥青的质量,对所选的基质沥青以及TLA,按照《公路工程沥沥青及沥青混合料试验规程》(JTJ 052-2011)规定方法,进行性能测试。由于TLA对普通石油沥青的改善效果与其掺量有密切的关系,可以根据试验所要求的TLA改性沥青的针入度范围,采用TLA针入度预估公式,通过掺配试验并利用迭代法计算出初步确定TLA的掺量范围。在初步确定的掺量范围里选择33%、35%、40%这三个掺量,对AC-20C和AC-13C的TLA改性沥青混合料进行相应的马歇尔试验和混合料性能试验,并综合考虑混合料的路用性能以及施工性能,最终确定TLA改性沥青中TLA的准确掺量,建议TLA的掺量为35%。其次,利用正交试验法对表面层(AC-13C)级配范围进行了优化设计。正交试验设计时,考虑4个关键筛孔(0.075mm、2.36mm、4.75mm、9.5mm)的通过率,并在施工技术规范规定的级配范围内取五种水平,这五种水平为下限、下中值、中值、上中值以及上限;对于TLA改性沥青混合料AC-13C型的油石比因素,选4.5%、5.0%、5.5%、6.0%和6.5%这5种水平。运用极差分析法,将每个因素对马歇尔指标的影响程度和变化规律进行分析。结果表明:MS、FL以及VMA的关键影响因素是2.36mm通过率;油石比是影响VV与VFA的关键因素;对MS影响最小的是0.075mm通过率,而FL、VV、VMA以及VFA受9.5mm通过率的影响最小。然后对正交试验结果进行综合分析,按施工技术规范规定的马歇尔试验配合比设计方法,结合同类工程实践经验进行多组室内马歇尔试通过对试验结果的比较,选取满足现行规范技术要求的合成级配。根据级配优化得出的级配范围进行表面层(AC-13C)TLA改性沥青混合料组成设计。并通过马歇尔试验确定TLA改性沥青混合料为5.9%。按照《公路沥青路面施工技术规范》(JTG F40-2004)确定中面层AC-20C级配范围,结合同类工程实践经验进行多组室内马歇尔试验得到最佳油石比为4.8%。再次,根据《公路沥青路面施工技术规范》(JTG F40-2004)的规定,对35%掺量TLA改性沥青混合料AC-20C和AC-13C进行路用性能分析。通过通过对沥青混合料按规范要求成型进行高温稳定性、水稳定性、低温抗裂性、渗水系数、肯塔堡浸水飞散试验检验,试验结果表明配合比设计满足现行规范的要求。总之,本文基于珠海市人民西路改造道路工程,通过试验以及理论分析,对TLA改性沥青及其混合料的性能进行了研究,为TLA沥青混合料的推广使用奠定了良好的基础。
[Abstract]:With the rapid development of China's economy and modern road transport industry, the rapid growth of traffic volume, overloading, overloading serious, traffic channelization is more and more obvious, the disease of the asphalt pavement of asphalt pavement is becoming more and more serious, there are increasingly high requirements. Using the technology of modified asphalt to improve asphalt and asphalt mixture performance means into people's vision and get more and more attention. First of all, in order to ensure the quality of TLA modified asphalt, asphalt selected and TLA, according to "highway engineering asphalt asphalt and asphalt mixture test procedures (JTJ > 052-2011) regulation method for performance test. Because there is a close relationship between the improvement effect TLA of common asphalt and its content, according to the penetration range required by the test of TLA modified asphalt, the TLA penetration prediction formula, by blending test and using the iterative method to calculate the preliminary determination The dosage of TLA. 33%, the dosage range initially identified in 35%, the three volume of AC-20C 40%, AC-13C and TLA modified asphalt mixture for the corresponding Marshall test and mixture performance test, and considering the mixture road performance and construction performance, and ultimately determine the accurate the admixture of TLA modified asphalt TLA, dosage of the proposed TLA for 35%. second, the surface layer by using the orthogonal test method (AC-13C) grading range was optimized. The orthogonal experimental design, consider 4 key sieve (0.075mm, 2.36mm, 4.75mm, 9.5mm) of the pass rate, and five in the scope of the provisions of the technical specification for construction of the gradation, the five level is lower, lower median, median, median and upper limit; for TLA modified asphalt mixture AC-13C aggregate ratio, 4.5%, 5%, 5.5%, 6% and 6.5% of the 5 level. By range analysis method, each because The Marshall index and extent of variation were analyzed. The results showed that MS, FL and VMA of the key factors is the passing rate of 2.36mm; aggregate ratio is a key factor affecting VV and VFA; the effect of MS on the minimum pass rate is 0.075mm, FL, VV, VMA and VFA by 9.5mm passing rate minimal impact. Then make a comprehensive analysis of the result of the orthogonal test, the mix design method of Marshall test according to the technical specification for construction of similar provisions, combined with the engineering practice experience were Marshall indoor test the test results, the current standard of synthetic gradation are selected to satisfy the technical requirements. According to the gradation range of surface layer gradation optimization (AC-13C) TLA modified asphalt mixture composition design. And through the Marshall test of TLA modified asphalt mixture for 5.9%. according to the technical specification for construction of highway asphalt pavement (JTG < > F40-2004) determination In the surface layer of AC-20C gradation range, combined with the similar engineering practice experience for multiple indoor test of Marshall get the best proportion is 4.8%. again, according to the technical specification for construction of highway asphalt pavement (JTG < > F40-2004) regulations of 35% dosage of TLA modified asphalt mixture of AC-20C and AC-13C for road performance analysis. Through the high temperature stability, according to the specification requirements of forming asphalt mixture water stability, low temperature crack resistance, seepage coefficient, Kentabao water dispersion test test, test results show that the mix design meet the requirements of the current specification. Overall, the people of West Road Reconstruction Project of Zhuhai city based on the test and theoretical analysis on the performance of TLA modified asphalt and the mixture was studied, and laid a good foundation for the promotion of TLA asphalt mixture.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U414

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