Evaluating the rheological effect of asphalt binder modification using soybean oil

Brazil is a highlight in the ranking of maize cooking oil production, which after consumption generates a significant amount of waste that the improper disposal of it, which could seriously affect the sewage pipes, groundwater, and soil. This research study the incorporation of 1%, 2%, and 3% of soybean (new and waste) in asphalt binder. The samples were analyzed by FTIR and frequency sweep tests. The results indicate that the optimum oil content is in the range of 1–2%, regardless of being new or residual. In the temperature sweep, it was found that the asphalt binder 55/75-E showed a smaller phase angle in all mixtures compared to the asphalt binder 50/70, thus having a better elastic recovery.     

橡胶／SBS复合改性沥青生产工艺分析

通过两种橡胶沥青生产工艺及性能特征的比照，引出一种具有更高路用性能的橡胶/SBS复合改性沥青，并从两方面对其优异性进行了深入分析，然后对其生产工艺流程及生产中的几个关键要素进行了详细的阐述。     

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。     

改性沥青抗变形能力研究

以测力延度（温度为5℃,拉速为5 cm/min）及15℃的弹性恢复对基质沥青及其不同SBS加入量的改性沥青进行抗变形能力的评价,通过对测力延度曲线的分析,探索基质沥青及SBS改性沥青拉伸过程中的规律,研究改性沥青抗变形能力。     

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.     

工艺条件对SBS改性沥青性质的影响

通过稳定剂加入次数、加入方式、星型SBS加入方式,研究了工艺条件对改性沥青性质的影响。研究发现,稳定剂加入次数越多,改性沥青的软化点越高,薄膜烘箱老化后延度越好。通过剪切方式加入稳定剂和加入SBS得到的改性沥青延度性质更稳定,薄膜烘箱老化前和薄膜烘箱老化后延度变化幅度减小。     

The effect of warm additive on the properties and behavior of an asphalt binder

Use of warm asphalt mix has been recently receiving a great attention because it allows decreasing production and distribution temperatures about 30–40°C by either reducing bitumen viscosity or enhancing mixture performance. These mixes also have other advantages such as a low pollution, reduced fuel consumption, and more implementation seasons. Despite these benefits, there is a constant concern about the performance of these mixes under the conditions such as permanent deformation, fatigue cracking, and low-temperature cracking. In the present study, two types of bitumen modifiers including liquid additive and Sasobit were used to adjust rheological properties of bitumen. After conducting the required tests on bitumen specimens prepared using these two additives and comparing the results obtained from two common and Strategic Highway Research Program tests under aged and nonaged conditions, it was revealed that, considering the viscosity of bitumen, these additives improve bitumen performance at ambient temperatures. Besides, the results indicate the improvement in rutting criteria (G^*/sinδ) and fatigue criterion (G^*×sinδ).     

The rheological behavior of rejuvenated SBS modified asphalt incorporating oil slurry and tri-epoxide

The viscous-elastic behavior, noise reduction and viscosity-temperature susceptibility of aged SBS modified asphalt (SBSMA) incorporated with fluid catalytic cracking slurry (FCC) and Trimethylolpropane triglycidyl ether (TMPGE) were investigated. The results indicate that the viscous-elastic temperature of rejuvenated binder will shift to a lower temperature due to the asphaltic composition adjustment and the agglomerate dispersion of the rejuvenators on aged binder; the viscous loss of binders relies upon their irreversible deformation; the rejuvenated binder makes contributions on reducing the vibration noise in comparison with aged one; the rejuvenated binder has a low viscosity that suitable for processing and pumping, and exhibits a weakening viscous-temperature susceptibility.     

Ultraviolet and PAV aging procedures influence on rheological characteristics of Sasobit/SBS modified binder containing titanium dioxide nanoparticles

Abstract

The objective of this study is to evaluate the rheological properties of styrene-butadiene-styrene and Sasobit modified asphalt binder blended with various contents (0%, 1%, 3% and 5%) of nano-titanium dioxide (TiO₂) after Ultraviolet (UV) aging and PAV aging procedures. Rheological test results showed that nanoparticles generally had no effect on the complex modulus and phase angle of binders. UV aged binders showed better fatigue and cracking resistance than the PAV aged binders. Finally, compared to the control binder, the binder with nanoparticles had a higher fatigue resistance after UV aged, but worse fatigue resistance after PAV aged.     

纳米蒙脱土/SBS复合改性沥青及其改性机理研究

利用纳米蒙脱土/SBS复合材料对沥青改性,通过示差扫描量热(DSC)法测试了改性沥青的热稳定性.利用红外光谱(FT-IR)法研究了其改性机理。结果表明,经纳米蒙脱土/SBS复合改性后,沥青的综合性能显著提高。纳米蒙脱土/SBS复合材料加入沥青中,形成稳定、均匀的网络结构,使沥青在韧性、强度与热稳定性方面具有明显改善。由于没有形成新的官能团,因此纳米蒙脱土/SBS复合材料对沥青的改性是一种物理共混过程。     

SBS改性沥青质量影响因素探讨

从基础沥青、苯乙烯-丁二烯-苯乙烯嵌段共聚物（SBS）加入量、SBS化学结构、相对分子质量、嵌段比、凝胶含量、膨化度等方面分析了原料对改性沥青性能的影响。并指出提高SBS改性沥青性能的主要措施为SBS的加入量控制在4％～6％；并根据基础沥青的芳香分含量调整SBS的嵌段比等。     

Influence of SBS and SBR on the properties of emulsified asphalt

The influence of SBS and SBR on the properties of cement emulsified asphalt mortar was studied. The results show that the fluidity and air content of mortars decrease with the SBR content, and increase with the SBS content. The type and content of modifiers have significant effect on the later strength of mortars. The toughness of mortars increases with the increase of modifier content, and decreases with the age. After 100 freeze-thaw cycles, the quality and the strength loss of mortars increase, and the strength loss of mortars with SBS is lower than that with SBR.     

Investigation of the effects of recycled engine oil bottoms on asphalt field performance following an oxidation modeling approach

This work investigates the effects of recycled engine oil bottoms (REOBs) on asphalt field performance by comparing asphalts with and without REOBs in terms of the asphalt properties required for pavement oxidation modeling. Specifically, oxidation reaction kinetics parameters, dynamic shear rheometer (DSR) function (DSRFn) hardening susceptibility (HS), and low sheer viscosity (LSV) HS are determined and compared for base binder, 5 wt.% REOBs, and 15 wt.% REOBs blends. At the higher percentage, addition of REOBs appears to increase the initial oxidation rate at field temperatures and significantly increases LSV HS, but does not significantly increase the DSRFn HS. A field modeling example elucidates the effects.     

Laboratory evaluation of the effects of short-term aging on high temperature performance of asphalt binder modified with crumb rubber and rice husk ash

This Paper aims to analyze the influence of the short-term aging on the physical and rheological characteristics of asphalt containing a combination of crumb rubber and rice husk ash at high temperature. To simulate the aging on a short term in the laboratory, the rolling thin film oven test was conducted. Obtained results indicated that adding CR and RA had significant positive effect on the aging resistance of asphalt binder through increasing penetration aging ratio (PAR) values. Nevertheless, adding CR and RA reduced softening point increment (SPI), viscosity aging index (VAI), as well as the rutting factor aging index (AIOR).     

An experimental study on the effects of temperature and asphaltene content on the rheological behavior of vacuum residues

In this study, the rheological behavior of five types of Iranian vacuum residues (VRs) containing different values of asphaltene content is investigated under the effects of a wide range of temperature and shear rate. Rheological tests showed that the asphaltene content of VRs plays an important role on the viscosity of these fluids. The samples with higher content of asphaltene have higher values of viscosity and also higher yield point. The Bingham plastic and Herschel–Bulkley models were successfully used to model the rheology and yield behavior of VR samples at a wide range of shear rate and temperature.     

The effect of nano-SiO2 and the styrene butadiene styrene polymer on the high-temperature performance of hot mix asphalt

The production of modified asphalt mixtures with appropriate performance in high temperature has always been under the attention of researchers. One of these modifiers is Styrene Butadiene Styrene (SBS) polymer. Since the application of SBS polymer in bitumen and asphalt mixture does not have expected performance of field due to phase separation of bitumen and polymer, oxidation, and aging, the present study tries to not only improve the polymer defects, but also analyzes its high-temperature performance by using nano-SiO₂ and SBS polymer in bitumen modification. According to the study results, adding nano-SiO₂ and SBS polymer with 3 and 4.5 bitumen weight percent, respectively, to bitumen in asphalt mixture leads to an increase of flow number in dynamic creep test at 50°C for 399 times and at 60°C for 1,015 times compared to unmodified asphalt mix. This, in turn, indicates the considerable improvement of asphalt mixture high-temperature performance.     

基于分子管理的渣油掺炼煤焦油常压溶剂脱沥青效果

考察了渣油（VR）掺炼煤焦油（CT）溶剂脱沥青过程效果的变化,优化了实验条件。结果表明,在最佳实验条件[萃取温度30.0℃,溶剂比6∶1（体积/质量）]下,当VR掺炼质量分数为10%的CT时,脱沥青油（DAO）收率较未掺炼者提高2.02个百分点,镍和钒总含量下降5μg/g,硫含量略有下降,氮含量基本不变。VR掺炼CT后黏度降低,胶体稳定性下降。实验所得脱油沥青为硬沥青,采用外掺油浆对其进行调和,随油浆加入质量分数的增加,调和沥青的延度、针入度增大,软化点降低,沥青性质得到改善。     

Experimental investigation of the effect of asphalt binder modified with nanosilica on the rutting,fatigue and performance grade

This research was performed to investigate the effect of nano-silica on the asphalt binder performance grade, rutting, and fatigue. The rutting and fatigue performance was tested by Multiple Stress Creep and Recover (MSCR) and time sweep test. The low-temperature cracking was tested by Bending Beam Rheometer test (BBR). The results showed the good performance of nano-silica in high and intermediate temperatures. The results of MSCR test show better performance in rutting and recovery as a result of the elastomeric property of nano-silica even in high temperatures. Nano-silica had a negative effect on the low performance grade of asphalt binder. The addition of nano-silica to asphalt binder increased the fatigue life up to 2.8 times. The Fourier transform infrared spectroscopy (FTIR) analysis was used for chemical analysis.     

An investigation of the effect of wettability on NMR characteristics of sandstone rock and fluid systems

Predicting reservoir wettability and its effect on fluid distribution and hydrocarbon recovery remains one of the major challenges in reservoir evaluation and engineering. Current laboratory based techniques require the use of rock–fluid systems that are representative of in situ reservoir wettability and preferably under reservoir conditions of pressure and temperature. However, the estimation of reservoir wettability is difficult to obtain from most laboratory experiments. In theory, it should be possible to determine the wettability of reservoir rock–fluid systems by nuclear magnetic resonance (NMR) due to the surface-sensitive nature of NMR relaxation measurements. Thus, NMR logs should in principle be able to give an indication of reservoir wettability, however, as yet there is no proven model to relate reservoir wettability to NMR measurements. Laboratory NMR measurements in representative and well-characterised rock–fluid systems are crucial to interpret NMR log data.A series of systematic laboratory experiments were designed using a range of sandstone core plugs with the aim of investigating the feasibility of using NMR measurements as a means to determine wettability. NMR T₂ spectrum measurements were performed in reservoir core plugs at different saturations and wettability states. The samples were first cleaned by hot solvent extraction, then saturated with brine and a drainage/imbibition cycle performed. At the lowest brine saturation the same samples were aged in crude oil and a further drainage/imbibition cycle performed. NMR transverse relaxation time, T₂, was measured on fully saturated samples, at residual saturations and some intermediate saturation values. The wettability of the samples is evaluated using the Archie's saturation exponent and by Amott-Harvey wettability index.The wettability of the cores studied ranged from mixed-wet to oil-wet. The NMR T₂ results for cleaned and aged reservoir core plugs, containing oil and water, show that fluid distribution and wettability can be deduced from such measurements. The results on aged core plugs suggest that the oil occupies a wide range of pore sizes and is in contact with the pore walls. The results presented in the paper suggest that NMR T₂ relaxation has the potential to be an alternative technique to evaluate rock wettability in the laboratory and in the reservoir.