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。     

高弹性SBS改性沥青的研究及应用

采用IRPC 70#A级基质沥青、CPC 90#A级基质沥青、SBS改性剂、稳定剂、抽出油等制备成高强度、高粘度、高弹性SBS改性沥青,对其指标及混合料性能进行检验。探索用高弹性SBS改性沥青铺筑2~2.5 cm应力吸收层,解决水泥路面白改黑、钢桥路面反射裂缝问题。结果表明,通过优质的70#A级或90#A级基质沥青,添加足够比例的SBS改性剂、稳定剂、抽出油等制作成的高弹性SBS改性沥青,能够作为应力吸收层解决反射裂缝问题。因具备高粘度、高强度性能,也可广泛应用于钢桥面,水泥路面防水粘结层。     

基于正交试验的多聚磷酸复配SBS改性沥青粘弹性研究

为了探究多聚磷酸(PPA)复配SBS改性沥青组成材料对其粘弹性的影响,本文以SK90#基质沥青、SBS改性剂、抽出油、稳定剂、PPA、邻苯二甲酸二丁酯(DBP)为原材料,在正交试验设计的基础上,用高速剪切机制备了PPA复配SBS改性沥青,利用动态剪切流变仪分析了其粘弹特性.结果表明:(1)随着温度的升高,PPA复配SBS改性沥青的抗车辙因子随之降低、弹性减弱、抗永久变形能力降低,而其相位角增大、粘性增强、不可恢复变形能力提高.(2)当多聚磷酸的掺量为0.5％,复配改性沥青的其他组分选择最大掺量(均为3号水平)时提高了其粘弹性能,达到最优流变性能.(3)当PPA掺量为0.5％,SBS掺量为4％,抽出油掺量为2％,DBP为2％时,其复配改性沥青的性能最佳.     

橡塑复合改性沥青的研发及在碎石封层中的应用

以基质沥青为主要原料,废旧轮胎橡胶粉和SBS为改性剂,糠醛抽出油、硫磺为添加剂,采用直接投入法生产橡塑复合改性沥青。对橡塑复合改性沥青的针入度、软化点、延度、弹性恢复和粘度性能进行分析,确定其最优生产配方和制备方法。将生产出的符合要求的橡塑复合改性沥青应用于沥青路面碎石封层中,总结出橡塑复合改性沥青碎石封层的施工工艺、施工参数及路用性能。应用实践表明：橡塑复合改性沥青不仅可改善沥青路用性能,降低养护成本,延长沥青路面预防性养护寿命,同时可提高废旧橡胶材料的利用效率,符合绿色环保,资源节约的要求。     

废旧胶粉改性沥青抗老化性能及效益分析

以辽河沥青为基质沥青,以废旧胶粉为改性剂,以糠醛抽出油为调合剂,可制备改性沥青。采用失重系数法、针入度比法考察2种沥青的抗老化性能。结果表明,与基质沥青相比,废旧胶粉改性沥青具有较好的抗老化性能。通过经济效益和社会效益分析,证明用废旧橡胶粉对沥青进行改性,既减少了废旧橡胶对环境的污染,又降低了改性沥青的生产成本。     

SBS改性脱油沥青宏观性能与微观形态的关系研究

以脱油沥青(DOA)制备针入度30号和50号的调和硬质沥青,并掺量2%到6%的星型SBS在170℃下经剪切、搅拌工艺制备SBS改性硬质沥青,对产物进行常规指标分析及荧光显微检测。常规指标分析表明SBS可以提高沥青的高温稳定性、低温抗裂性能和感温性能;存储稳定性分析表明稳定剂的加入可以明显的改善沥青的稳定性和抗老化性能;荧光显微镜图像表明改性沥青宏观性能与微观结构之间存在相关性,改性沥青要达到较好的宏观性能需要其微观结构中改性剂和沥青呈现均匀连续分散的状态。利用SBS和稳定剂制备优质改性硬质沥青合适配方为:SBS添加量为3.0%,稳定剂添加量为0.2%。     

催化裂化油浆糠醛抽出油调和道路沥青

将催化裂化油浆糠醛抽出油与60#,70#,90#,100#四种基质沥青以1∶1、1∶2、1∶4、1∶6的比例进行调和,考察糠醛抽出油对沥青性能的影响因素。通过对16种调和沥青进行测试分析,发现糠醛抽出油对沥青针入度,软化点和延伸度的影响,以70#沥青为基质,糠醛抽出油与沥青调和比例为1∶4时,能调和出符合国家标准的100#优质道路沥青。     

SBS改性沥青软化点的影响因素研究

软化点是评价SBS改性沥青高温性能的重要指标,本文主要介绍了基质沥青、改性剂型号及添加量、稳定剂添加量、工艺条件对SBS改性沥青软化点的影响。     

SBS改性沥青在制备和热储存过程中的四组分与性能分析

以中石化公司金陵厂生产的90#A级沥青为基质沥青,添加占基质沥青质量4%燕山石化产SBS 4303及其他添加剂制备SBS改性沥青,研究了该改性沥青在改性前后、不同老化试验条件下及在163℃下热储不同时间下四组分变化情况及其与改性沥青各性能指标变化的相关性。     

脱油沥青调合生产A级道路石油沥青试验研究

本文主要利用丙烷脱沥青工艺产生的脱油沥青与糠醛抽出油、减压渣油调合,制备A级道路石油沥青。经试验研究,脱油沥青与糠醛抽出油、减压渣油按一定比例调合可以生产出符合标准要求的70#A级道路石油沥青,不能生产合格的30#和50#道路沥青。     

微藻油改性沥青耐老化性能研究

为缓解石油沥青短缺局势,探索微藻油用于沥青改性可行性及改性沥青长期性能,将微藻液经降解、离心、萃取得到微藻油并制备改性沥青。通过不同微藻油掺量下改性沥青延度、软化点和黏度确定微藻油最佳掺量,通过高低温流变试验、混合料路用性能试验分析微藻油改性沥青经旋转薄膜烘箱(RTFOT)短期老化、压力老化容器(PAV)长期老化和紫外老化后性能变化并与SBS改性沥青对比,借助红外光谱分析微藻油改性沥青分子结构组成。结果表明:微藻油掺量为30%(外掺质量分数)时,改性沥青延度达到最大值,软化点和黏度满足改性沥青要求;微藻油改性沥青和苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青经RTFOT短期老化后性能差异不显著,微藻油改性沥青耐PAV长期老化和耐紫外老化性能优于SBS改性沥青,尤其是耐紫外老化性能更优。红外分析表明两种改性沥青均含有乙烯基双键、芳香族C—H、甲基和亚甲基等类似成分,但芳香族C—H、伸缩C—C成分含量存在差异。微藻油改性沥青比SBS改性沥青增加的酰胺不饱和基团和羧基利于改性沥青形成网络分子结构。     

Effect of material composition on antistripping performance of SBS modified asphalt mixture under dry and wet conditions

Styrene-butadiene-styrene (SBS) modified asphalt used in road engineering is a complicated mixture of various compositions. The present study was undertaken to evaluate the influence of different raw materials and their content on the moisture stability of SBS copolymer modified asphalt mixture. A total of 18 different combinations of base asphalt, SBS, furfural extract oil (FEO), and stabilizer were considered to prepare different SBS modified asphalt samples, and the contact angle test was carried out to determine the work of adhesion and the work of debonding of SBS modified asphalt with aggregate. Moreover, a multi-factor Analysis of Variance (ANOVA) was conducted to investigate the statistical effects of the material composition factors. The results show that the bond strength between SBS modified asphalt and aggregate is significantly affected by the source of base asphalt, but it is insensitive to the change of SBS type under dry and wet conditions. Besides, the moisture damage resistance of SBS modified asphalt improves firstly and then reduces with the rising storage of SBS, FEO, and stabilizer. Furthermore, linear regression analysis suggests that the work of adhesion under dry condition has excellent correlation with the work of debonding under wet condition.     

Improved properties of SBS‐modified asphalt with dynamic vulcanization

Storage‐stable styrene‐butadiene‐styrene triblock copolymer (SBS)‐modified asphalt was prepared by dynamic vulcanization. The vulcanization characteristics of the asphalt/SBS/sulfur blend were studied using a strain‐controlled rheometer. The vulcanization of SBS in the asphalt resulted in a marked increase in the torque of the blend. In addition, the vulcanization of a butadiene rubber (BR)/sulfur blend was significantly influenced by the addition of asphalt through a curemeter. The existence of asphalt can accelerate the vulcanization of BR/sulfur blend and reduce its reversion. The preparation process of storage‐stable SBS‐modified asphalt by dynamic vulcanization was identified by a plot of the electric current versus time. The addition of sulfur to the SBS‐modified asphalts resulted in the formation of chemically vulcanized network structures in the modified binders. The physical properties of the SBS‐modified asphalt containing sulfur were compared to those of the modified binders without sulfur. The storage stability of the SBS‐modified asphalt was effectively improved by the addition of sulfur. The rheological properties of the SBS‐modified asphalts before and after adding sulfur were characterized by using dynamic shear rheometry and a rotational viscometer. As indicated by the monitored morphology, the compatibility and high‐temperature storage stability of SBS‐modified asphalts were improved by the addition of sulfur.     

Preparation and properties of high viscosity modified asphalt

High viscosity modified (HVM) asphalt was prepared by the addition of styrene–butadiene–styrene (SBS), plasticizer, crosslinker. The effect and proportion of each modifier in the preparation of HVM asphalt were studied. SBS was the major modifier and determined the basic properties of HVM asphalt. Plasticizer (furfural exact oil) and crosslinker (sulfur) as additional modifiers were necessary in improving the workability, stability, and aging resistance of modifier. The effect of aging and additional modifiers on the structure and rheological behavior of SBS modified (SM) asphalt was displayed by adopting various rheological tests. Plasticizer declined the rutting resistance of SM asphalt and increased the viscous behavior of SM asphalt after aging. The use of crosslinker led to the formation of polymer network and improved the aging resistance of SM asphalt. The morphology observation shows crosslinker led to the formation of polymer network and improved the compatibility between SBS and asphalt. Plasticizer prompted the swelling and dispersion of SBS in asphalt and improved the effect of crosslinker further. Aging destroyed the polymer phase seriously and there was still residual polymer phase in asphalt. POLYM. COMPOS., 38:936–946, 2017. © 2015 Society of Plastics Engineers     

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。     

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。     

SBS/MMT复合改性沥青的动态力学性能

制备了苯乙烯—丁二烯—苯乙烯三嵌段共聚物(SBS)与蒙脱土(MMT)质量比不同的共混物,并用其对沥青进行了复合改性;同时还制备了相应质量比的SBS/MMT直接复合改性沥青。利用应变控制动态剪切流变仪测试了上述不同改性沥青试样的动态力学性能,结果表明:SBS/MMT共混物复合改性沥青的高温弹性、高温抗车辙变形能力较SBS单独改性沥青与SBS/MMT直接复合改性沥青整体上均有不同程度的提高,温度敏感性有均所下降。     

基于温拌沥青技术的苯乙烯-丁二烯-苯乙烯嵌段共聚物/橡胶粉复合改性沥青应力吸收层层间性能

将3种不同的温拌剂添加到苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）/橡胶粉复合改性沥青中,并拌和相应的应力吸收层混合料成型后制得复合式试件,通过黏度试验评价了不同温拌剂对SBS/橡胶粉复合改性沥青降黏效果的影响,通过层间拉拔试验、剪切试验和剪切疲劳试验分析了温拌SBS/橡胶粉复合改性沥青混合料应力吸收层层间性能的变化特性。结果表明,温拌剂的降黏效果由优到劣的顺序依次为:Evotherm-3 G、Sasobit-LM、Aspha-min,温拌沥青技术并不影响常温环境下复合改性沥青应力吸收层层间的黏结性能和抗剪性能;高温及水浴环境会导致不同应力吸收层层间力学强度明显降低,且不同温拌剂复合改性沥青应力吸收层的层间拉拔强度和抗剪强度存在差异,其中温拌剂Evotherm-3 G和Sasobit-LM能够增强应力吸收层层间的力学强度;相对于SBS/橡胶粉复合改性沥青的应力吸收层,添加温拌剂会缩短应力吸收层混合料的层间剪切疲劳寿命,Sasobit、Aspha-min和Evotherm-3 G温拌复合改性沥青应力吸收层的层间剪切疲劳寿命分别缩短了约10.0%、17.4%和2.7%。     

废旧轮胎橡胶粉/苯乙烯-丁二烯-苯乙烯嵌段共聚物/石油树脂复合改性沥青的制备及性能

以苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）、废旧轮胎橡胶粉和石油树脂制备复合改性沥青,并对复合改性沥青的储存稳定性、温度敏感性、高温流变性能、抗车辙性能和黏度等进行了考察。结果表明,复合改性沥青中,SBS、废旧轮胎橡胶粉及石油树脂的最佳质量分数分别为4.5%、14.0%和4.5%;石油树脂/SBS/废旧轮胎橡胶粉复合改性沥青具有较好的储存稳定性、温度敏感性和抗车辙性能。