Performance of SBR-Modified Asphalt Yufeng Cong

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.     

胶乳改性乳化沥青性能试验研究

实验室内通过添加不能掺量的SBS胶乳和SBR胶乳分别制成改性乳化沥青。分别考察了筛上剩余量、恩格拉粘度、储存稳定性以及残留物的软化点、延度等几项主要指标随胶乳掺量变化的情况。SBS胶乳和SBR胶乳在对乳化沥青高低温性能的改善上各有侧重,建议在对高温性能要求较为严苛的地区使用SBS胶乳改性乳化沥青,而在对低温性能要求较为严苛的地区使用SBR胶乳改性乳化沥青。     

化学改性对SBR胶乳改性乳化沥青性能的影响

考察了SBR胶乳改性乳化沥青的性能与基质沥青组成的关系，化学改性剂对基质沥青组成的影响；详细研究了化学改性对SBR改性乳化沥青主要性能包括软化点、针入度和低温延度的影响规律。结果表明，化学改性是提高SBR胶乳改性乳化沥青软化点的有效途径，对改性乳化沥青的实际应用具有一定的指导作用。     

废食用油改性沥青性能研究

利用不同掺量(1%、1.5%、2%、2.5%)废食用油作为改性剂制备废食用油改性沥青,通过三大指标试验、黏度试验及动态流变剪切试验、弯曲梁流变试验、多重应力蠕变恢复试验,对其物理性能及流变性能进行研究。试验表明:废食用油的添加,针入度有所增加,软化点降低,延度增大,黏度则有所减小,说明了废食用油的添加可以显著改善其低温性能,但对其高温性能有不利影响。同时,由MSCR与DSR的SHRP车辙参数及弯曲流变梁试验可以得出:废食用油的添加会降低沥青的抗车辙能力,从而对其高温稳定性有不利影响。当控制其掺量在2%以内时,其影响很小,同时可提高其低温性能。     

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。     

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.     

宽域改性乳化沥青研究

对国内常见沥青的感温性能、力学性能进行研究，对目前常用沥青改性剂SBS、SBR、EVA、PE与沥青改性配伍性及效果进行了研究，通过试验筛选出了SS／SBR改性剂和乳化剂，确定了宽域改性乳化沥青的配方和生产工艺。检测结果显示，该宽域改性乳化沥青产品5℃延度大于150cm，软化点大于75℃，提高了改性乳化沥青的性能。实现了沥青性能在感温性方面的宽域。     

Aging Performance of SBS Modified Asphalt

Abstract

The penetration, softening point, and ductility of the aging basic asphalt and styrene-butadiene-styrene (SBS) modified asphalt were studied, and the thin film oven aging behavior of them was researched by using infrared spectrum. The experimental results showed that the softening point was increased, the penetration and ductility were decreased after basic asphalt thin film oven aging; the results of aging SBS modified asphalt thin film oven aging was similar too. The research of infrared spectrum indicated that absorbing–oxygen oxidation reaction was taking place when basic asphalt film was aging, carbonyl and sulfoxide groups were increased after SBS modified asphalt thin film oven had been aging. The aging extent of SBS modified asphalt was bigger than basic asphalt and the ability of bearing low temperature was better. SBS modified asphalt could have worse anti-aging performances than that of base asphalt.     

改性沥青软化点影响因素的研究

对影响改性沥青软化点的因素进行了研究,首先对PE、SBS、SBR、EVA四种改性沥青的软化点进行了比较研究,又针对SBS改性沥青研究了基质沥青及SBS的型号、剂量等因素对改性沥青软化点的影响。     

SBR改性沥青生产工艺

介绍并分析了目前我国多家生产厂采用的四种SBR改性沥青生产工艺：胶块粉碎单釜循环工艺、胶粉双釜循环工艺、胶块溶剂工艺、胶乳工艺;以及这些生产工艺的产品质量和使用的SBR改性剂的性质。阐述了SBR改性沥青的生产技术关键以及提高产品质量的途径,认为：使用块状改性剂时要解决好胶块的粉碎问题,使用粉状改性剂时要解决好胶粉再次结块的问题,使用粉状改性剂是今后的发展方向;应采用适宜的反应温度等工艺条件,并添加适宜的助剂来提高SBR与沥青的相容性。     

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.     

伊朗计划兴建300个新港口

2010年12月30日获悉,为扩大伊朗港口的装卸量,伊朗计划兴建大批新港口。负责伊朗港口与海事事物的负责人AtaollahSadr表示,自去年以来,伊朗已经建造了40多个多功能港口。AtaoHahSadr指出,伊朗国内港口集装箱目前的装卸量为每年440×10^4t,预计到2015年将达到700×10^4t。伊朗港口每年的吞吐量为1．5×10^9t,今后5a内将大幅增加。报道称,今年前8个月,非石油类货物的装卸量为9100×10^4t,与去年同期相比增长了15％。伊朗此前曾宣布,非石油类货物出口量自今年年初增加了26％。     

接枝交联SBR改性道路沥青的研究

通常以丁二烯和苯乙烯为单体经低温(5℃)乳液聚合的SBR为改性剂,制得的改性沥青具有优良的耐低温性能、延展性能等特点,但是,在一定量的添加范围内,其粘韧性、韧性往往达不到交通运输部JTG F40—2004《公路沥青路面施工技术规范》中聚合物SBR类改性沥青的指标要求,为此,研究开发了接枝交联SBR。进行了接枝交联SBR改性道路沥青试验,结果表明,在相同添加量试验条件下,接枝交联SBR改性沥青与未接枝的SBR改性沥青相比,其粘韧性、韧性、热储存稳定性和抗老化性等指标都有大幅度的提高。     

克拉玛依SBS改性沥青的热稳定性

采用化学复合法对克拉玛依沥青进行SBS改性，并对其热稳定性进行了考察。结果表明，化学复合法改性的沥青由于SBS与沥青之间有交联反应，它们的相容性好，使SBS能均匀稳定地分散在沥青中，且SBS的粒度小，因此具有良好的物理稳定性。模拟储存试验中沥青的软化点、针入度和延度数据表明，改性沥青在高温下具有良好的化学稳定性，其高低温性能也得以改善。按美国SHRP评价，克拉玛依SBS改性沥青达到了PG76-34等级。     

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.     

橡胶沥青的工艺优化

通过设计正交试验和应用极差分析法,以克拉玛依石化公司沥青为原料,内掺橡胶粉及改性助剂,采用剪切-反应法制备橡胶沥青,考察了废胶粉加入量、反应温度和反应时间对沥青性能的影响,确定最优条件为:胶粉加入量21%,反应温度180℃和反应时间3h。在最优条件下制备的橡胶沥青各项指标均符合交通部橡胶沥青技术标准的要求,其软化点和5℃延度均达到最高值,离析满足SBS改性沥青的离析指标,表现出良好高低温性能和储存稳定性。     

网络结构理论在沥青改性研究中的应用

利用了网络结构理论解释了LDPE以及GMA-g-LDPE分别改性秦皇岛基质沥青、中海36-1基质沥青的软化点、低温延度、针入度指数以及高温稳定性随着改性剂含量变化而变化的规律。红外光谱研究表明，LDPE改性沥青体系中LDPE与沥青二者属于溶涨没有发生任何反应，GMA-g-LDPE改性沥青体系中GMA所含的C=O 的特征吸收峰仍然存在，但907.69cm - 1有环氧基吸收峰消失了，说明GMA-g-LDPE的侧链环氧环与沥青中的官能团发生了反应而形成网络结构。     

沥青胶结料基本高温性能指标相关性研究

高温稳定性是沥青胶结料重要技术要求之一。针入度、软化点、60℃动力黏度和针入度指数是工程中最为常用的高温性能评价指标。为探究这些高温性能指标的区分度和关联性,对34种源于不同工程的沥青胶结料进行检测,基于聚类分析法和灰色关联分析法对试验数据进行分析。结果表明,60℃动力黏度指标相比针入度和软化点指标能够更有效地区分不同沥青胶结料的高温性能;70号基质沥青和高黏度改性沥青的60℃动力黏度与软化点关联度高,但SBS改性沥青60℃动力黏度与其他高温性能指标的关联度低;考虑到动力黏度能够客观表征流变特性,建议在实际工程中可将60℃动力黏度列为强制性指标。     

SBR胶粉改性沥青的研究

SBR胶粉对沥青延度提高比SBR胶乳明显，但对软化点改善效果不及SBR胶乳，应用中可以复配SBS以满足较高软化点要求。添加抗氧化剂可以提高SBR改性沥青的老化后性能。静止热储存时SBR改性沥青延度将下降。     

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.