SBS改性沥青的老化动力学研究

通过薄膜烘箱试验,研究了催化裂化油浆与渣油调合后进行SBS改性所制得的沥青在不同老化温度、老化时间下的软化点和表观黏度的变化规律,并以表观黏度为参数建立了SBS改性沥青的老化动力学模型.结果表明:SBS改性沥青的软化点随老化时间的变化不是单调地增大或减小,而在老化后其表观黏度升高,且其表观黏度在实验范围内随时间的递增增...     

Effect of thermochromic materials on physical and aging properties of SBS modified asphalt

Abstract

The effects of different types (red, black and blue color) and content (2% and 4%) of thermochromic powders on aging properties of styrene-butadiene-styrene copolymer (SBS) modified asphalt were investigated. Physical properties of the binders (ductility, penetration, viscosity and softening point) were tested before and after thermal-oxidative and ultraviolet radiation aging. The results showed thermochromic powders improved the deformability and weakened the high-temperature performance of SBS modified asphalt to some extent. Thermochromic powders could obviously improve the anti-aging properties of SBS modified asphalt. In addition, SBS modified asphalt with 2% thermochromic materials showed the best aging resistance under all aging modes.     

道路沥青及SBS改性沥青的紫外老化研究

采用紫外辐射试验对道路沥青和SBS改性沥青进行加速老化试验研究.利用老化前后的软化点、针八度、延度和四组分变化。分析了道路沥青的紫外线老化机理。结果表明:随紫外线老化时间的延长,道路沥青和SBS改性沥青软化点呈上升趋势、针入度和延度呈降低变化趋势,其中又以延度变化最为明显。经紫外线老化后道路沥青和SBS改性沥青的四组分也有变化,其中沥青质略微上升、芳香分略微降低,而饱和分和胶质变化不大。     

改性剂类型对废胶粉/SBS复合改性沥青性质的影响机理研究

以中油燃料油股份有限公司高富炼油厂生产的50号重交道路沥青为基质沥青,研究了不同化学结构的SBS和不同粒径胶粉对废胶粉/SBS复合改性沥青软化点、针入度、低温延度以及动力粘度的影响,研究表明：复合改性沥青的粘度明显比单一改性剂生产的改性沥青高,星型SBS对软化点和粘度的影响较大,合适粒径的胶粉对复合改性沥青性能的改善较大。     

紫外线添加剂对沥青紫外线老化的改善作用

采用沥青薄膜烘箱试验（TFOT）和紫外线老化试验，对壳牌90号重交通道路石油沥青，以及掺加添加剂后沥青的针入度、软化点、延度和粘度等指标进行了试验研究。试验结果表明，紫外线老化对沥青性能有比较明显的影响作用，但掺加合适剂量的某些添加剂后，沥青性能可以在一定程度上得到改善；此外，通过TFOT还表明紫外线添加剂对沥青热老化也有一定的改善作用。     

利用环氧化SBS改性镇海沥青的研究

采用环氧化SBS改性镇海沥青,研究了改性沥青的针入度、软化点、延度的变化规律,并探讨了环氧化SBS改性沥青的机理.实验结果表明,SBS牌号、ESBS改性剂的环氧基质量分数和加入量以及反应时间等条件郝影响改性沥青的三项指标.     

化学助剂对SBS改性沥青的性能影响初探

通过加入化学助剂制备一种反应性SBS改性沥青,研究助剂加入量对改性沥青性能及高温储存后性能影响,对比其与高速剪切工艺所得改性沥青性能差异,并利用荧光显微照片分析两者微观形态的不同。结果表明：改性沥青性能随着助剂加入量增加先变好后变差。助剂加入量为0.6%时,改性沥青低温和高温性能最好;高温储存后延度与老化延度有一定的下降,针入度与软化点变化较小;加入助剂比高速剪切制得的改性沥青的低温性能和储存稳定性更好;荧光显微照片显示,剪切后SBS以颗粒的形式分散在沥青中,而加助荆使SBS与沥青形成均匀连续的网状结构。     

Study on Aging Capability of Paving Asphalt

Abstract:

The changes of softening point, penetration, and ductility of two asphalts after aging were studied. Two methods are simultaneously used to study the aging kinetics of two asphalts and some kinetic parameters are given in this paper. The results show that the softening points increase while penetration and ductility values decrease after aging. It was concluded that the aging capability of AH-70 asphalt is better than AH-90 asphalt. The aging kinetic models of two asphalts based on softening points are compared with a pentane asphaltene aging kinetic model and the results are consistent. A new and easy method for studying the aging of asphalt was developed.     

剪切工艺条件对SBS改性沥青性质的影响

考察了剪切频率、剪切时间和发育时间对SBS改性沥青软化点、25 ℃针入度、5 ℃延度、PI值的影响。结果表明,剪切时间与剪切速率对提高软化点有一定的互补作用,增加剪切时间与剪切速率在促进SBS颗粒空间三维网状结构形成、提高软化点的同时,限制了其低温塑性变形（5 ℃延度）,降低了PI值;发育时间对SBS改性沥青性能影响相对较小。工艺参数对25 ℃针入度的影响相对较小。确定SBS改性沥青的最佳工艺条件为：剪切时间90 min,发育时间30 min ,剪切速率4 000 r/min。该条件下制备的改性沥青能够满足SBS类(I-C)的技术要求,同时提出可以通过调整某个工艺参数,有针对性地改善改性沥青某一方面的性质。     

Compatibility between SBS and Asphalt

Abstract

The compatibility between SBS and asphalt was studied by molecule simulation and asphalt's basic capability testing. The results indicated that SBS and asphalt had different compatibility in the different SBS added amounts at different temperatures. Some compositions of the asphalt could enter an assembled polybutadiene segment. The effects of this phenomenon enhanced the Glass transition temperature. With high shear force effect, some compositions of the asphalt also could enter a polystyrene segment, which decreased the Glass transition temperature, but did not seriously disjoin the physical cross-linking point. When the mass fraction of SBS was 4%, SBS presented disperse spherical grain. However, when the mass fraction of SBS was over 8%, it formed a continuous phase. With the increasing mass fraction of SBS, the softening point and low temperature ductility would increase, and penetration and high temperature storage stability would decline.     

SBS母粒法改性沥青的研制及生产

介绍了SBS母粒法改性沥青工业生产及产品性能 ,重点阐述了SBS母粒法改性沥青生产原料、工艺和体系配伍性 ;研究考察了改性沥青的离析性、针入度指数和旋转薄膜烘箱试验后低温延度的影响因素 ;采用优化方案 ,在工业装置生产出符合JTJ0 36— 98标准的成品改性沥青。     

乳化改性沥青防水涂层的研究

本实验将0.1μm～5μm的沥青微粒分散到由复合乳化剂所配制的乳液中,从而制得乳化沥青,再向乳化沥青中加入一定量的SBS胶乳,混合搅拌制得乳化改性沥青,并对其各项指标进行测定。当取沥青质量为50g时,由HLB值相近原则,取水250g,SDS阴离子乳化剂0.64g,OP-10非离子乳化剂8.36g,制得相对稳定的乳化沥青。随后,逐渐加入SBS胶乳,随着SBS胶乳加入量的增大,乳化改性沥青的性能逐步得到提高。当SBS胶乳质量百分含量达到7%时,软化点、针入度和延伸度均达到较好的水平。     

用薄膜氧化法指导生产1号AH-70道路沥青的研究

根据薄膜烘箱试验的氧化历程建立了一种能评价和预测用氧化法生产70号沥青时产品膜后性能的试验方法,经过实验室和工业的验证;该种薄膜氧化法用来模拟和预测浅度氧化生产70号沥青时产品的软化点,膜后低温延度和针入度比具有较好的准确性,这一特点在指导A原油生产1号AH-70道路沥青时取得了较理想的结果。     

Study on Aging Kinetics of Saudi Arabian Paving Asphalt

Abstract

The changes of n-pentane asphaltene content, penetration, softening point, and ductility of two Saudi Arabian paving asphalts have been studied during aging. Further, aging kinetics of asphalt, based on the change of n-pentane asphaltene content, has been studied. Some correlative kinetic parameters were calculated and the aging kinetics equation of asphalt was gained. The value calculated depending on the equation was in accordance with the experimental data. And the relationship between the composition of the high grade paving asphalt and its aging resistant performances was revealed. It showed that the aging of high grade paving asphalt was a first-order reaction. AH-70 paving asphalt has the following characteristics: higher reaction active energy, less reaction velocity constant, lower aging velocity, and better aging resistance performance compared with AH-90 paving asphalt. The changes of penetration, softening point, and ductility of asphalt during aging further proved that the kinetic model is reliable.     

An investigation on the effect of SBS+Vacuum bottoms residue modification on rheological characteristics of asphalt binder

In this research, the effect of adding SBS and vacuum bottoms residue on 60/70 neat asphalt binder have been carried out using classic and superpave testing methods. Adding SBS led to increase of softening point, elastic recovery and viscosity of asphalt binder. Besides, SBS reduced the penetration and ductility of specimens. Results of dynamic shear rheometer indicated that G^* and G^*sinδ reduced by adding the SBS content before and after aging while δ and G^*/sinδ parameters increased. Therefore, adding SBS improves the permanent deformation and fatigue resistance of neat asphalt binder.     

具有优良粘结性能的反应性SBS改性沥青的研究

将一种反应性助剂用于改善SBS改性沥青的粘结性能.研究了该反应性助剂对SBS改性沥青常规物理性能和粘结性能的影响.结果表明：反应性助剂的加入,明显地提高了SBS改性沥青的软化点、低温延度和弹性恢复率,显著增加了SBS改性沥青对钢板的粘结强度,所制备的SBS改性沥青具有优良的粘结性能.     

SBS胶乳改性乳化沥青制备技术研究

研制了一种新型改性剂——SBS胶乳,用于对乳化沥青进行改性制备改性乳化沥青。通过考察乳化剂用量对改性乳化沥青贮存稳定性的影响,得出乳化剂的最佳用量(w)为1%;通过考察SBS胶乳对沥青软化点、延度和针入度的影响,得出SBS胶乳改性剂的最佳用量(w)为6%;由光学显微镜分析得出,SBS颗粒和沥青颗粒的大小、密度相近,这是保证SBS在体系中均匀分散的重要因素。根据确定的乳化剂和改性剂的最佳用量,制备出了性能优良的改性沥青乳液。     

TLA改性沥青流变和老化性能的研究

采用动态剪切流变仪（DSR）对不同掺量的11A改性沥青的流变性能进行了研究,并通过薄膜烘箱老化（TFOT）和紫外老化（uv）试验研究了TLA对沥青老化性能的影响。结果表明：加入TLA后,沥青的复数模量增大,相位角减小,TLA的掺量每增加10％,PG高温区间基本上升1个等级,大大提高了沥青的高温稳定性和降低了其温度敏感性。与未改性沥青相比,TLA改性沥青TFOT和UV老化后的软化点增量和粘度变化指数显著减小,TFOT老化后的残留针入度比明显增大,TLA的加入有效地改善了沥青的热氧老化和紫外老化性能。     

塔河渣油掺兑催化裂化油浆生产道路沥青研究

催化裂化（FCC）油浆的典型特点是其中富含芳香分,是优质道路沥青的理想调合组分。使用FCC油浆和交联缩舍FCC油浆掺兑塔河渣油生产改质沥青,并研究了不同馏出率油浆同塔河渣油按不同比例掺兑所得沥青的软化点、针入度及粘度等的变化规律。确定催化油浆最佳掺兑比例为25％～35％,改质沥青基本性能可满足道路沥青标准。同时,向塔河改质沥青中添加5‰的抗老化剂,膜后性质表明残留针入度比有了明显提高,老化性能得到明显改善。用FCC油浆调和塔河渣油,可以充分利用各自的优势,发挥出最大的效益生产出高质量的道路沥青,对我国道路建设的发展具有重要的意义。     

Performance of SBR-Modified Asphalt Yufeng Cong

Abstract

A dose of SBR modifier added to asphalt can improve asphalt's performance in stability, permanence, viscosity, and resistance to aging. Better application performances of asphalt pavement are affected directly by proper SBR modifying. This paper shows some investigations that confirm the relationship between the addition of SBR with the structure and the properties of SBR-modified asphalt. This paper also discusses the modified asphalt high temperature property, low temperature ductility, and mechanism of SBR-modified asphalt. The addition of SBR modifier showed an increase in viscosity, softening point, and elastic recovery of modified asphalt with rising temperature. When the temperature rises, the improvement of SBR-modified asphalt in softening point, elastic recovery, and visco-toughness result from SBR cross-linking. Although the lengths of low temperature ductility of SBR-modified asphalt are increased, the viscosities of modified asphalt increase; however, the softening point between the upper layer and lower layer were about 1.8°C after the isolated experiment.