PPA/SBS复合改性沥青的性能研究

研究了添加不同多聚磷酸(PPA)掺量的SBS改性沥青的性能,分析了多聚磷酸影响SBS改性沥青的机理。结果表明,随PPA掺量的增加,SBS改性沥青的软化点、135℃运动粘度、车辙因子、针入度指数、针入度比等技术指标逐渐增大,而RTFOT老化前后的5℃延度值、针入度值均下降。     

SBS改性沥青的老化行为

用红外光谱、凝胶渗透色谱、动态黏弹仪研究了苯乙烯-丁二烯嵌段共聚物(SBS)改性沥青的薄膜烘箱老化行为。结果表明，SBS改性沥青老化后增加了羰基和亚砜基；SBS和沥青的相对分子质量都发生了变化。沥青的相对分子质量增加，相对分子质量分布变宽，SBS特征峰消失；SBS改性沥青老化程度较基质沥青的小，耐低温性能更好；SBS改性沥青老化后，软化点增加，针入度减小，低温延度降低。     

降粘剂对高掺量SBS改性沥青性能影响研究

研究了不同种类和掺量的降粘剂对高掺量SBS改性沥青软化点、针入度、延度、运动粘度、老化延度等常规指标的影响;通过动态剪切流变仪(DSR)进行沥青高温路用性能测定,研究了降粘剂对高掺量SBS改性沥青高温车辙性能的影响。结果表明,掺入降粘剂既可以降低高掺量SBS改性沥青的运动粘度,又可以提高改性沥青的高温性能。     

Leadcap温拌剂对SBS改性沥青性能影响的研究

将不同掺量的Leadcap温拌剂按照一定的试验方法掺加进SBS改性沥青中,检测沥青的针入度、软化点、延度、布氏黏度和流变性能等指标,探讨Leadcap温拌剂对SBS改性沥青性能的影响。研究表明,Leadcap温拌剂降低了SBS改性沥青的稠度;低温延度增加,改善了低温抗裂性能;软化点和车辙因子增大,相位角减小,改善了沥青的高温抗车辙性能;布氏黏度减小,对沥青起到了温拌作用,达到了环保节能的效果。     

苯乙烯-丁二烯-苯乙烯嵌段共聚物改性沥青的老化性能

考察了苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)和加入含硫稳定剂的SBS改性沥青老化后的动态力学性能、黏度变化和低温物理性能。结果表明,SBS与含硫稳定剂的加入改善了老化后沥青的高温性能;老化后的改性沥青表现出更好的高温刚性,蠕变劲度降低,蠕变速率增大,老化后沥青的低温性能提高,且长期使用性能良好。     

不同相容剂掺量下沥青改性效果研究

以减三糠醛抽出油为相容剂,90#沥青为基质沥青,LG501S为改性剂,考察了相容剂的不同掺入量(占基质沥青质量)0,1.0%,2.0%,3.0%,4.0%,5.0%对改性沥青性能的影响,分析了增加相容剂掺入量沥青相与SBS相的形态特征。结果表明,增加相容剂掺入量后,改性沥青针入度、弹性恢复逐渐升高,软化点、针入度比逐渐降低,经过旋转薄膜烤箱(RTFOT)后,改性沥青5℃延度、5℃老化后延度逐渐增加,提高了改性沥青的延伸性能。随着相容剂掺入量的增加,改性沥青的高温抗车辙因子能力降低,低温抗裂性能提高;改性剂SBS在沥青中的粒径逐渐减小,分布律逐渐增加,使改性沥青的储存稳定性得到显著提高。     

纳米ZnO与SBS复合改性沥青性能试验研究

介绍了溶剂法纳米ZnO/SBS复合改性沥青的制备工艺,然后基于针入度、软化点和延度三大指标试验、离析试验及RTFOT后老化指标性能试验,综合分析了纳米ZnO不同掺量对SBS改性沥青高温和低温性能、均匀稳定性及抗老化性能。试验结果表明,纳米ZnO能够有效改善SBS改性沥青的高温抗变形性、低温抗裂性、高温储存稳定性及抗老化性能。综合纳米ZnO掺入SBS改性沥青后的性能效果及经济成本,建议纳米ZnO掺量为5%。     

SBS掺量对改性沥青性能影响及指标关联研究

采用常规和SHRP等检测手段研究SBS掺量对改性沥青性能影响,并对表征改性沥青高温性能、低温性能的评价指标进行相关性研究。研究结果表明:随着SBS掺量增加,改性沥青常规性能、高温性能、低温性能均得以提高;改性沥青软化点、60℃动力黏度和高温临界温度在表征改性沥青高温性能方面具有良好的相关性,且软化点与高温临界温度的相关性优于60℃动力黏度;5℃延度、烘后延度和低温临界温度在表征改性沥青低温性能方面具有良好的相关性,且5℃延度与低温临界温度的相关性优于烘后延度。     

基于响应面法的高黏度复合改性沥青中丁苯橡胶/苯乙烯-丁二烯-苯乙烯嵌段共聚物/胶粉的最优掺量

采用响应面（Box-Behnken）法,以丁苯橡胶（SBR）、苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）和胶粉各自的掺量作为影响因素,以沥青的三大技术指标、60℃动力黏度及170℃布氏黏度为评价指标建立各自的响应面模型,探讨三种添加剂掺量对沥青技术指标的影响规律,并优选出高黏度复合改性沥青中SBR、SBS和胶粉的最佳掺量。结果表明,分别以质量分数5%、5%和15%的SBS、SBR和胶粉复合而成的高黏度复合改性沥青性能最好,其针入度为4.63 mm,延度为364 mm,软化点为86.5℃,60℃动力黏度为78 158 Pa·s,170℃布氏黏度为2.72 Pa·s,各项指标均高于标准要求。     

RTFOT与TFOT试验对SBS改性沥青老化效果相关性分析

对两种不同SBS掺量的SBS改性沥青进行了在不同温度和时间下的RTFOT老化试验,检测了残留物的软化点、针入度、延度1、35℃运动粘度及车辙因子,并同时检测了163℃下5 h的TFOT老化残留物样品的相应指标,分析了RTFOT与TFOT老化效果的相关性。探讨了RTFOT与TFOT在SBS改性沥青老化试验中的可互相替代条件。     

Outdoor aging of road asphalt and SBS modified asphalt

The process of performance degradation of road asphalt (RA) is regarded as aging. At present, better understanding of the thermal-oxidative aging of asphalt is achieved and the corresponding method to evaluate this process is developed; meanwhile, photo-oxidative aging (aging in an atmospheric environment, which is referred to as “outdoor aging” in this paper) of asphalt remains at the initial stages of scientific exploration. The outdoor natural ultraviolet (UV) aging of RA and SBS modified asphalt (SBSMA) are investigated in this study. The experimental results show that the basic performances of RA and SBSMA present similar change tendencies. The softening point increased, while the penetration and ductility decreased as the outdoor aging time passed by, and the 5°C ductility (ductility measured at 5°C) of SBSMA decreased very quickly. The group components of RA and SBSMA also change during UV aging. The content of asphaltene rose and that of aromatics and saturates decreased, while the content of resins changed insignificantly. Moreover, the Fourier transform infrared (FTIR) graphs show that the content of sulfoxide and carbonyl groups in RA and SBSMA increased significantly during the outdoor aging process.     

甘肃省沥青路面长期老化后沥青微观分析研究

选择了道路石油沥青、实验室Pressure Vessel Aging(PAV)老化及沥青路面长期老化沥青作为研究对象,分析可知与基质沥青及实验室老化沥青相比,SK90#沥青在经过路面长期老化后,沥青的力学性能发生了明显的变化,表现为针入度与延度下降,软化点与粘度升高.通过傅里叶红外变换光谱和凝胶渗透色谱分析可知,沥青在老化过程中发生氧化发应,生成羰基和亚砜基官能团,且小分子链减少,大分子链增加;运用热重分析仪测定了沥青老化前后的热稳定性,发现老化前后沥青的热稳定性能基本保持不变.     

TFOT与RTFOT对不同油源石油沥青老化效果相关性分析

对两种不同油源的道路石油沥青进行了在不同时间下的沥青旋转薄膜加热试验(RTFOT)老化试验,检测了残留物的软化点、针入度、延度、135℃运动粘度及车辙因子,并同时检测了163℃下5h的沥青薄膜加热试验(TFOT)老化残留物样品的相应指标,分析了RTFOT与TFOT老化效果的相关性。探讨了RT-FOT与TFOT在不同油源的石油沥青老化试验中的可互相替代条件。     

活化废轿车轮胎胶粉及其改性沥青的基本性能

采用双螺杆挤出机辅以活化剂制备活化废轿车轮胎胶粉(GTR),用其改性沥青或与苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)复合改性沥青。研究了活化GTR的溶胶、凝胶含量,考察了活化GTR改性沥青和活化GTR/SBS复合改性沥青的基本性能及微观形貌。结果表明,热剪切以及添加活化剂均能提高GTR的溶胶含量,使脱硫降解程度增大;用活化GTR改性沥青,改性沥青的针入度大幅增大,软化点、弹性回复、黏度明显降低;用活化GTR/SBS复合改性沥青,随着活化GTR含量的增大,改性沥青的软化点升高,针入度、延度、弹性回复降低,但经旋转薄膜老化后延度提高,耐老化性能提高;活化GTR在沥青中的粒径明显减小,分散性得到改善,而活化GTR/SBS复合改性沥青时,GTR均匀分散于SBS的网络结构中。     

The influence of UV aging of a Styrene/Butadiene/Styrene modified bitumen: Comparison between laboratory and on site aging

During the service life in a pavement, neat bitumen and modified bitumen age as the result of the mixing with aggregates, the process of laying, the climatic conditions and the traffic. Laboratory methods for simulating the short-term and long-term ageing (RTFOT and PAV, respectively) are standardized. None of them takes into account the influence of UV radiations. In the particular case of a pavement located in south France, a comparison is drawn through Fourier Transformed InfraRed (FTIR) analysis. Three types of ageing are compared: the standard simulated ageings, the actual on site ageing after 12 and 26 months of road service and the ageing when UV exposure in a weathering oven follows RTFOT simulation. According to carbonyle function evolution by FTIR spectroscopy, this work shows that for all tested binders, the same ageing level as the one simulated by PAV is reached in a few hours when a thin film of binder is submitted to UV exposure after RTFOT. It is also to be noted that the level of the on site ageing of a SBS Polymer modified Bitumen (PmB) reaches the simulated PAV ageing after 12 months of pavement life.     

糠醛抽出油在SBS改性沥青中的应用研究

以中石化金陵炼化厂生产的90#A级沥青为基质沥青,以岳阳石化厂生产的SBS791-H为改性剂,一种糠醛抽出油作为相容剂制备了改性沥青,研究了不同糠醛抽出油添加量下,改性沥青在RTFOT老化前后四组分和性能的变化情况,探讨了糠醛抽出油对SBS改性沥青的作用机理以及适宜添加量。     

Preparation of β-cyclodextrin/SBS modified asphalts for the improvement of anti-aging,rheological property,and storage stability

Styrene-butadiene-styrene (SBS) modified asphalt (SMA) has been widely used in road engineering for decade. However, the phase separation of SMA was obvious during the transport and SBS degraded after aging. To resolve these problems, β-cyclodextrin (β-CD) was used to modify SMA in this work. Conventional properties, storage stability, the effect of short-term aging on the morphology, and rheological property for SMA and β-CD/SMA were investigated. The softening point of modified asphalt reached to the maximum of 66.7°C when 1 wt% β-CD was added to SMA, where the penetration had shown the minimum of 80.8 dmm. In addition, the ductility of β-CD/SMA increased to the maximum of 797 mm when the content of β-CD was increased to 5 wt%. Furthermore, incorporation of β-CD improved the storage stability of SMA. Importantly, the aggregation of SBS was observed in β-CD/SMA, but modifiers distributed uniformly after a short-term aging. The rutting resistance and antiaging performances of SMA were also improved by the addition of β-CD. Considering the comprehensive properties of modified asphalt, the optimum content of β-CD was found to be 2 wt%.     

煤沥青与石油沥青共混改性及其热解特性

考察了不同添加量的煤沥青四氢呋喃萃取物(THFS)对石油沥青的改性,随着THFS添加量的增多,改性沥青针入度降低,软化点升高,延度下降,参照英国标准(BSI BS—3690)得出最佳添加量为8%。利用TG-FTIR、FTIR对改性沥青进行了表征,结果表明:THFS、改性沥青的失重率大于基质沥青70的失重率; THFS在700～900cm^-1处芳香烃类的透射峰强度明显强于基质沥青与改性沥青;沥青老化后在2953cm^-1和1377cm^-1(—CH₃)、1461cm^-1和2924cm^-1(—CH₂—)处透射峰逐渐增强;1600cm^-1(C=O和苯环C=C)透射峰逐渐增强;沥青热解半焦中的脂肪烃类物质含量较少,主要以高度缩合的稠环芳香烃类物质为主;沥青在老化过程中主要发生了氧化、裂解、加成、聚合、缩合等反应。