PREPARATION OF HEAVY PAVING ASPHALT BY BLENDING–OXIDIZING ANSHAN VACUUM RESIDUE AND THE EVALUATION OF ITS PAVING PERFORMANCE

ABSTRACT

In this paper, various brand heavy paving asphalts conforming to GB/T15180-94 standard have been prepared by blending–oxidizing Anshan vacuum residue, and their pavement performances have been evaluated. The laboratory test shows that the prepared AH-70 and AH-90 has the characteristics of good temperature susceptibility, good high-temperature stability and good low-temperature cracking resistance. The mathematic model of the relationship between penetration, softening point of the asphalt and the blender content has been set up and, the relationship between penetration, softening point and the oxidation time has been found. Those mathematic models built by gradual regression of the experiment data can be used to determine the adding amount of the two blenders. Fan daobo experiential equation, which described the relationship between softening point of the paving asphalt and its compositions, has been corrected and the corrected equation is more suitable for the prepared paving asphalts than Fan daobo experiential equation.     

Study on Aging Kinetics of Saudi Arabian Paving Asphalt

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.     

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.     

道路沥青标准与道路沥青生产

对道路沥青及现行道路沥青标准指旨标合理性进行了讨论，并对现行的道路沥青标准的制定、道路沥青标准与生产之间关系进行了分析。通过不同基属原油经不同生产工艺生产的道路沥青针入度、软化点、延度指标之间的关系，指出延度与针入度没有比较明确的对应关系．讨论了ＧＢ／Ｔ１５１８０—９４标准中以升入度２０为间隔进行的分级可能对生产造成的问题．提出了普通和高等级道路沥青指标的修改建议。     

Study on Aging Kinetics of Panjin Paving Asphalt

In this paper, the changes of n-pentane asphaltene content, penetration, softening point, and ductility of two Panjin paving asphalts have been studied during aging. Further, based on the change of n-pentane asphaltene content, a study on aging kinetics of asphalt has been conducted. Some correlative kinetic parameters were calculated, and the aging kinetic equation of asphalt was gained. The value calculated, depending on the equation, was in accordance with the experimental data. In addition, 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. Moreover, the kinetic model was proved to be reliable by investigating the changes of penetration, softening point, and ductility of asphalt during aging.     

A Study on Antiaging Performances of Two Paving Asphalts

Abstract

In this article, the processes of Anshan oxidizing paving asphalts have been studied and the kinetic models for two paving asphalts were put forward. Based on the change of service performances, viscidity, and Gastel index (Ic), the aging resistance of the two asphalts have been compared. Meanwhile, the aging mechanism also has been investigated. The results show that the presented dynamics models can be used to describe the aging velocity for the two asphalts perfectly. According to dx/dt(AH-90) > dx/dt(AH-70), it can prove that the aging resistance of AH-70 is better than that of AH-90. After aging, the change of both penetration and softening point of AH-70 are lower than that of the corresponding parameters of AH-90, and the aging index of AH-70 is also lower than that of AH-90, which proves that the aging resistance of AH-70 is better than that of AH-90. During aging, every composition tends to be transformed into the heavier one. As a result, the asphltene content increases, the original colloidal structure of asphalt is destroyed to deteriorate paving performances of the asphalt.     

SBS改善道路沥青及沥青混合料性能的研究

以欢喜岭AH-90、日本-110沥青为基料,分别加入6%的燕山牌SBS-2改性剂制成的改性沥青,其针入度指数PI、高低温性能,弹性恢复性能,老化性能均得以提高,建议SBS-2最佳掺加量：国产重交基质沥青为4%-6%,进口基质沥青为4%-5%。     

国内外典型道路沥青抗车辙性能的对比研究

通过采用灰色相关理论法和SHRP动态剪切法对国内外19种典型重交通道路沥青的抗车辙性能进行研究,并对影响抗车辙性能的几个因素进行讨论。研究结果表明,软化点、动力粘度、沥青质含量指标与沥青的抗车辙性能直接相关。软化点高、动力粘度大并且沥青质含量高的沥青具有较好的抗车辙性能,同时沥青彼此间的抗车辙性能差异较大,其中国产的沥青具有较好的抗车辙性能。     

A STUDY ON AGING KINETICS OF ANSHAN PAVING ASPHALT

The aging processes of two Anshan paving asphalts conforming to GB/T15180-94 standard have been studied by Rotation Thin Film Oven Test (RTFOT) and the aging kinetic models of two paving asphalts have been determined. The results show that the aging of the prepared paving asphalt is a first order reaction. The viscosity of the asphalt increases gradually with the aging time. The greater the aging index is, the more easily the asphalt is aged. Because the chains break down to form free radicals, oxidation reactions occur. The aging resistance of the asphalt with lower aromaticity and with less aromatic cycle numbers is weak.     

A STUDY ON AGING KINETICS OF ANSHAN PAVING ASPHALT

ABSTRACT

The aging processes of two Anshan paving asphalts conforming to GB/T15180-94 standard have been studied by Rotation Thin Film Oven Test (RTFOT) and the aging kinetic models of two paving asphalts have been determined. The results show that the aging of the prepared paving asphalt is a first order reaction. The viscosity of the asphalt increases gradually with the aging time. The greater the aging index is, the more easily the asphalt is aged. Because the chains break down to form free radicals, oxidation reactions occur. The aging resistance of the asphalt with lower aromaticity and with less aromatic cycle numbers is weak.     

Study on Aging Capability of Paving Asphalt

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.     

超临界流体萃取技术生产重交通道路沥青的研究

研究了采用超临界流体萃取技术(SFEF),以减压渣油和催化裂化油浆为原料,制备重交通道路沥青产品的可行性.结果表明:当原料中油浆掺入量为10%～30%时,可以生产出牌号为AH70,AH90,AH110的重交通道路沥青产品.工业试验表明,生产牌号为AH70,AH90的重交通道路沥青,采用此技术方案是可行的.     

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.     

Influence of Chemical Composition on the Physical Characteristics of Paving Asphalts

The simplest general compositional model considers asphalt to be made up of asphaltenes, heavy oils, and resins. In the present study the extent of similarity between the properties and composition of various types of asphalt obtained from different sources has been carefully explored. It shows how ductility, penetration, and softening point are related to the chemical nature of paving asphalts in the range 41-58 softening points. Asphalt properties are found to be a direct function of its chemical constituents. The relationship between softening point and asphaltene content was found to be linear while asphalts of the same softening point are easily distinguished by the content of the resins. Evaluation of the two asphalt indices—the asphaltene index (I_A) and the Gaestel index (I_C), reveals that they both vary linearly with the composition of asphaltenes and resins thus confirming their suitability in the characterization of asphalts. Comparison of the two indices shows that IC is more suitable in estimating the colloidal stability of different groups of asphalts. The observed correlations can be found useful in the areas of asphalt blending and rejuvenating through the appropriate selection of asphalt components.     

道路沥青老化动力学的研究--以软化点为参数建立沥青老化动力学模型

研究了以辽河油田生产的稠油为基质沥青自制的两种沥青老化后软化点的变化，以软化点为参数建立了沥青一级老化动力学模型。并用该动力学模型对这两种沥青的抗老化性能进行了研究，求得了动力学参数。实验结果表明，这两种沥青老化后软化点均升高，AH-70沥青抗老化性能优于AH-90沥青，以软化点为参数建立的沥青老化动力学模型较好地表征了沥青老化过程，为研究沥青老化提供了一种简便可行的分析方法。     

塔河原油所产道路沥青抗老化性能研究

分析了高沥青质塔河原油减压渣油生产道路沥青的潜在优势和不足,认为主要问题是所产道路沥青的抗老化性能较差和延度较低.研究了塔河减压渣油所产道路沥青的老化过程动力学,结果表明,该道路沥青老化时,活化能较低、反应速率常数较高,老化前后沥青各项指标变化幅度较大,表现出沥青的抗老化性能差.通过对沥青老化机理的分析,认为可采用组分调合、部分改性及添加抗老化添加剂的方法来解决延度低、抗老化性能差的问题.试验数据表明,利用上述方法,可以使塔河原油所产道路沥青的延度和抗老化性能得到改善,主要技术指标符合优质产品规格要求.     

Influence of Chemical Composition on the Physical Characteristics of Paving Asphalts

Abstract

The simplest general compositional model considers asphalt to be made up of asphaltenes, heavy oils, and resins. In the present study the extent of similarity between the properties and composition of various types of asphalt obtained from different sources has been carefully explored. It shows how ductility, penetration, and softening point are related to the chemical nature of paving asphalts in the range 41–58 softening points. Asphalt properties are found to be a direct function of its chemical constituents. The relationship between softening point and asphaltene content was found to be linear while asphalts of the same softening point are easily distinguished by the content of the resins. Evaluation of the two asphalt indices—the asphaltene index (I _A ) and the Gaestel index (I _C ), reveals that they both vary linearly with the composition of asphaltenes and resins thus confirming their suitability in the characterization of asphalts. Comparison of the two indices shows that IC is more suitable in estimating the colloidal stability of different groups of asphalts. The observed correlations can be found useful in the areas of asphalt blending and rejuvenating through the appropriate selection of asphalt components.     

齐鲁牌AH-90重交通道路沥青路用性能的研究

对齐鲁石化公司胜利炼油厂利用科威特原油开发生产的齐鲁牌AH—90重交通道路沥青及其混合料的性能进行了试验，并在高速公路上铺筑了试验路，对其路用性能进行了较为全面的研究，与国产原油某AH—90重交通道路沥青进行了对比分析。试验结果证明了齐鲁牌AH—90重交通道路沥青在高速公路上应用的可行性和可靠性。     

辽河超稠油直接生产重交沥青工艺

从研究超稠油的馏分分布入手,开发了辽河超稠油改质-蒸馏法直接生产重交沥青新工艺,并进行了工业应用试验,妥善地解决了沥青的闪点、软化点、蒸发损失与针入度之间的矛盾.工业应用结果表明,采用超稠油改质-蒸馏法新工艺,不但提高了轻质油品的收率,而且可以直接生产出符合国家标准要求的重交沥青系列产品,同时沥青的高温性能及感温性能得到改善,提高了炼油厂的经济效益.     

Road Asphalt Prepared by High Softening Point De-oiled Asphalt From Residuum Solvent Deasphalting

Solvent deasphalting process is an effective pretreatment upgrading technology for vacuum residuum. The rational use of the de-oiled asphalt with high softening point needs to be solved when the process was applied to upgrade the residue oil. Preparation of the hard paving asphalt with low penetration by adding a certain proportion of high softening point de-oiled asphalt to the commodity 70# paving asphalt was investigated. The performance and The feasibility of the preparation 50# paving asphalt with high softening point de-oiled asphalt has been also discussed. The experimental results showed that the properties of the blend asphalt were changed in different extent with the different proportion between 70# paving asphalt and high softening point de-oiled asphalt. The rheological behavior tests showed that the anti-rutting performance of blending asphalt could be improved due to the addition of de-oiled asphalt. The qualified 50# paving asphalt could be prepared from the de-oiled asphalt and the commodity 70# paving asphalt with the appropriate blending ratio.