布敦岩沥青材料性能试验研究

发布时间：2018-03-10 17:16

本文选题：布敦岩沥青(BRA)　切入点：改性沥青　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：印度尼西亚布敦岩沥青(BRA)是一种优良的沥青改性剂,由于其性能突出、施工简便、经济合理,近几年来备受关注,但目前我国缺少系统的BRA及其改性沥青相关技术规范,从而在一定程度上束缚了其推广应用。因此,很有必要深入研究布敦岩沥青的材料组成、改性机理及其改性沥青的性能,本文据此通过大量室内试验对BRA材料性能进行深入研究。1)采用离心抽提仪与旋转蒸发器相结合的方法分离BRA中的矿物质和纯沥青。针对细矿物质和三氯乙烯对提纯的干扰,采用了静置沉降、振动真空箱和砂芯漏斗的方法除去细矿物质,适当加温蒸馏除去三氯乙烯,同时结合BRA的特点对抽提方法进行了改进。2)对BRA的密度、沥青含量、粒径分布、X射线衍射图、扫描电镜图等进行了检测分析,得出BRA符合印尼标准,其中矿物质以方解石和云母为主,沥青与矿物质紧密包裹。对BRA颗粒进行分离后,对其矿物质成分、粒度、比表面积等进行了分析,得出矿物中CaCO3和Si02含量较高,研磨粒度与矿粉类似,比表面积大于矿粉。对分离出的纯沥青进行了四组分、元素组成、分子量、红外光谱、扫描电镜和热分析等检测,并与基质沥青及其改性沥青进行了对比。结果表明,BRA纯沥青组分中沥青质含量高且胶体分子量大,环结构多,杂原子含量高,官能团键能大,热分解温度高,流动性较差,说明BRA纯沥青的掺入能提高基质沥青的高温稳定性、抗老化性和粘附性,降低温度敏感性,但是低温性能相对较差。3)对BRA纯沥青、BRA改性沥青和基质沥青进行了针入度分级和PG分级试验研究。结果表明,BRA纯沥青的掺入可有效改善基质沥青的感温性、高温稳定性、抗变形能力以及抗老化等路用性能,但是低温性能有所降低。总之,本文对BRA及其改性沥青综合性能的研究结果可为BRA的进一步推广应用提供参考。
[Abstract]:Indonesia Budun Rock Asphalt (BRA) is a kind of excellent asphalt modifier. Because of its outstanding performance, simple construction and reasonable economy, it has attracted much attention in recent years. However, there is a lack of systematic BRA and its modified asphalt related technical specifications in our country at present. Therefore, it is necessary to study the material composition, modification mechanism and performance of Budun rock asphalt. In this paper, the properties of BRA materials are studied through a large number of laboratory tests. 1) the method of separating minerals and pure asphalt from BRA by centrifugal extractor and rotary evaporator is used. The interference of fine minerals and trichloroethylene on purification is discussed. The methods of static settlement, vibrating vacuum box and sand core funnel were used to remove fine minerals, proper heating distillation was used to remove trichloroethylene, and the extraction method was improved by combining with the characteristics of BRA. 2) the density and asphalt content of BRA were improved. The results of X-ray diffraction and scanning electron microscopy showed that BRA met the Indonesian standard, in which calcite and mica were the main minerals, bitumen was closely wrapped with minerals, and BRA particles were separated. The mineral composition, particle size and specific surface area were analyzed. The results showed that the contents of CaCO3 and Si02 in the minerals were high, the grinding granularity was similar to the ore powder, and the specific surface area was larger than that of the mineral powder. The molecular weight, infrared spectrum, scanning electron microscope and thermal analysis were compared with the base asphalt and its modified asphalt. The results showed that the asphaltene content was high, the colloidal molecular weight was high, the ring structure was more and the heteratomic content was high in the pure asphalt component. The addition of BRA pure asphalt can improve the high temperature stability, aging resistance and adhesion of the base asphalt, and reduce the temperature sensitivity. But the low temperature performance is relatively poor. 3) the penetration and PG classification tests of BRA pure asphalt modified asphalt and base asphalt are carried out. The results show that the blending of BRA pure asphalt can effectively improve the temperature sensitivity and high temperature stability of the base asphalt. The deformability and aging resistance of BRA and its low temperature properties have been reduced. In a word, the results of the study on the comprehensive properties of BRA and its modified asphalt can provide a reference for the further popularization and application of BRA.
【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】：U414

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