scholarly journals Preparation and Characteristics of Ethylene Bis(Stearamide)-Based Graphene-Modified Asphalt

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 757 ◽  
Author(s):  
Xia Zhang ◽  
Jun-Xi He ◽  
Gang Huang ◽  
Chao Zhou ◽  
Man-Man Feng ◽  
...  
Keyword(s):  
Shear Rate ◽  
Low Temperature ◽  
Softening Point ◽  
Design Method ◽  
Uniform Design ◽  
Processing System ◽  
Creep Recovery ◽  
Stable Form ◽  
Adsorption Effect ◽  
Modified Asphalt

In this study, graphene-modified asphalt (GMA) was prepared from SK-70# matrix asphalt and ethylene bis(stearamide) (EBS). Based on the uniform design method, a model was created using Data Processing System (DPS) software and First Optimization (1stOpt) software using the graphene mixing amount, EBS mixing amount, shear rate, shear time, and shear temperature as factors and using the asphalt penetration, softening point, force ductility, SHRP-PG test, and multistress creep recovery data as indices. Calculations and analysis showed that the optimal composition and preparation parameters of GMA are as follows: the graphene proportion is 20‰, the EBS proportion is 1%, the shear rate is 6000 r.p.m., the shear time is 180 min, and the shear temperature is 140 °C. The prepared GMA had a significantly improved softening point, low-temperature fracture energy, antirutting factor, and creep recovery rate, indicating that adding graphene can improve the high- and low-temperature performance of asphalt. The prepared GMA was characterized by X-ray diffraction (XRD). The dispersibility of graphene in asphalt was evaluated by fluorescence microscopy and Image-Pro Plus imaging software. The results show that graphene can exist in asphalt in a stable form, which increases the loose-layered structure of stacked asphalt or gum. The intense adsorption effect of graphene strengthens the ordered structure of asphalt. However, due to its dispersibility characteristics, some graphene exists in asphalt in clustered form. When the graphene-to-dispersant ratio approaches the optimal value, the dispersant changes the form of graphene in asphalt from irregular clusters to regular clusters and from large, distinct clusters to small, indistinct clusters. When dispersant cannot uniformly disperse graphene in asphalt, graphene clusters primarily form medium-sized grains.

scholarly journals Improving the Low-Temperature Performance of RET Modified Asphalt Mixture with Different Modifiers

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1070
Author(s):  
Cheng Xu ◽  
Zhengqi Zhang ◽  
Feifei Liu
Keyword(s):  
Low Temperature ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Creep Recovery ◽  
Dry Process ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Comparison Results ◽  
Beam Bending ◽  
Low Temperature Performance

To improve the low-temperature performance of RET (Reactive Elastomeric Terpolymer) modified asphalt mixture (RETM), polyurethane prepolymer (PUP) was used by wet process, ground waste rubber (GWR) and fibers were used by dry process. Tests of force ductility, bending beam rheometer (BBR), differential scanning calorimeter (DSC), viscosity and multiple stress creep recovery (MSCR) were conducted to study the effects of PUP on the performance of RET modified asphalt (RETA), and beam bending test was conducted to study the effects of GWR and fibers on the performance of RETM. Then, tests of beam bending, wheel tracking, Marshall immersion, freeze-thaw splitting, and economic analysis were further conducted to compare the performance and economy of RETM modified with optimum modifiers suggested. All modifiers improve the low-temperature performance of RETM. PUP content, the content and size of GWR and the content and type of fibers significantly affect the performance of RETA or RETM respectively. After analysis, 10% PUP, 2.1% 80 mesh GWR and 0.2% polyester (PE) fiber are considered as the optimum modifiers, respectively. Comparison results show that optimum modifiers variously improve the low-temperature performance, rutting resistance and moisture susceptibility of RETM, but they slightly reduced the economy of RETM. Comprehensive evaluation shows that 2.1% 80 mesh GWR and 10% PUP are better than 0.2% PE fiber.

scholarly journals Stability Evaluation and Mechanism of Asphalts Modified With Various Rubber Powder Contents

2021 ◽  
Vol 7 ◽  
Author(s):  
Hengxiao Xue ◽  
Yuanbo Cao ◽  
Qi Liu ◽  
Hongfei Zhang ◽  
Mingliang Zhang
Keyword(s):  
Low Temperature ◽  
Softening Point ◽  
Stability Index ◽  
Test Methods ◽  
Segregation Index ◽  
Rubber Powder ◽  
Evaluation Indexes ◽  
Modified Asphalt ◽  
Powder Content ◽  
Storage Properties

Ground tires are one of the main sources of urban solid waste. Rubber powder-modified asphalt provides an effective method to solve the problem, and it presents good high- and low-temperature performance in sustainable pavement construction. However, the storage properties of rubber powder-modified asphalts prepared from the traditional low-temperature shear mixing method are unstable, which restricts their application. In this study, four test methods (the softening-point test; the dynamic shear rheological test; the Laboratory Asphalt Stability Test; and fluorescence image analysis) and six evaluation indexes (the softening-point difference Sdiff, the segregation percentage Sp, the segregation index Ise, the segregation rate Rs, the degradation rate Rd, and the stability index Ist) were employed to analyze the storage abilities of asphalts modified by various activated rubber powder contents. The results show that the storage properties have a positive correlation with rubber powder content in the modified asphalt, and a rubber powder content of 60% is proven to be the optimum mixing amount. The rubber powders can distribute uniformly in the asphalt matrix when mixed below the optimum mixing amount; otherwise a rubber powder agglomeration is formed. The quantitative morphology analysis results are in good agreement with the laboratory test conclusions. The activated rubber powder shows better compatibility compared with ordinary rubber powders and presents a promising method to treat waste ground tires.

Experimental Study on Polyphosphoric Acid (PPA) Modified Asphalt Binders

2010 ◽  
Vol 152-153 ◽  
pp. 288-294 ◽  
Author(s):  
Wei Dong Cao ◽  
Shu Tang Liu ◽  
Hong Lu Mao
Keyword(s):  
Low Temperature ◽  
Softening Point ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Point Test ◽  
Low Temperature Performance ◽  
Four Levels ◽  
Temperature Susceptibility

Polyphosphric acid (PPA) modified asphalt binders were produced in the laboratory using one base asphalt and four levels of PPA contents (0.6%, 1.0%, 1.5% and 2.0% by weight of base asphalt). Penetration test, softening point test, rotation viscosity test, creep test with bending beam rheometer (BBR) and four components test were carried out to study the performance of PPA modified asphalt binders and possible modification mechanism. The results indicate that the high-temperature performance of PPA modified asphalt binders are obviously improved and temperature susceptibility are decreased, but the low-temperature performance slightly decline compared with base asphalt. The PPA content has a very significant effect on softening point whereas it has no significant influence on low-temperature performance according to variance analysis (ANOVA). Finally, four components test reveals that the primary modification mechanism of PPA is the change of chemical composition of asphalt binder.

scholarly journals Studying the Properties of SBS/Rice Husk Ash-Modified Asphalt Binder and Mixture

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Zhen Lu ◽  
Aimin Sha ◽  
Wentong Wang ◽  
Junfeng Gao
Keyword(s):  
Low Temperature ◽  
Rice Husk ◽  
Softening Point ◽  
Rice Husk Ash ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Modified Asphalt Binder ◽  
Rotational Viscosity

Sustainable materials in the field of road pavement have become a research direction in recent years. In this study, the rice husk ash with small dosage of styrene-butadiene-styrene (SBS) was added as a bioadditive into the base asphalt to modify its properties. Different contents (0, 2, 5, 10, and 15%) of rice husk ash (RHA) and 1% of SBS were selected to prepare the modified asphalt. Penetration, softening point, ductility, rotational viscosity test, and temperature sweep test were conducted to investigate the properties of SBS/RHA-modified asphalt binder. Rutting test, moisture susceptibility, and low-temperature cracking were utilized to evaluate the performances of SBS/RHA-modified asphalt mixture. The results showed that the penetration decreased and the softening point and rotational viscosity enhanced while the ductility slightly decreased with the incorporation of rice husk ash. The SBS/RHA-modified asphalt mixture had better high-temperature performance than that of the virgin asphalt mixture but slightly lower moisture stability and low temperature performance. The tensile strength ratio of the virgin and modified asphalt mixture met the requirement of specification. The tensile strain of mixture SR15 was lower than the requirement for the asphalt mixtures on the basis of the specification. For the SBS/RHA-modified asphalt binder based on the comprehensive properties, the content of rice husk ash should not be higher than 15%.

Performances Comparison of Mine Filler Asphalt Mortar and Diatomite Asphalt Mortar

2013 ◽  
Vol 361-363 ◽  
pp. 1861-1864 ◽  
Author(s):  
Yong Chun Cheng ◽  
Hui Li Ma ◽  
Jian Ping Huang ◽  
Peng Zhang ◽  
Jing Lin Tao
Keyword(s):  
Low Temperature ◽  
Temperature Sensitivity ◽  
Asphalt Concrete ◽  
Apparent Viscosity ◽  
Softening Point ◽  
Mechanical Performance ◽  
Bending Test ◽  
Mixing Ratio ◽  
Modified Asphalt ◽  
Asphalt Mortar

In order to study the different influences of mine filler and diatomite on asphalt mortar performance, asphalt mortars with 7% mix amount of mine filler and diatomite were tested for apparent viscosity at 135°C, penetration value at 25°C, and softening point. PI and PVN were used to evaluate the temperature sensitivity of the two kinds of asphalt mortars as well. Further, asphalt mortar bending test at low temperature were done to verify the good mechanical performance of diatomite asphalt mortar. Results indicate that, compared to mine filler, diatomite has stronger modified effect on asphalt, including apparent viscosity, penetration and softening point. And diatomite is more conducive to weakening temperature sensitivity of asphalt mortar. In addition, bending test indicates that diatomite asphalt mortar is more conducive to upgrade low temperature performance. Thus, it is significant for the preparation of diatomite modified asphalt concrete on the design of grade mixing ratio, so as to be conducive to promoting the use of diatomite modified asphalt concrete.

scholarly journals Effects of a Fuel-Resistant Modifier on the High-Temperature Characteristics of Asphalt Binders

2021 ◽  
Vol 13 (14) ◽  
pp. 7924
Author(s):  
Wenchang Liu ◽  
Hongjun Li ◽  
Hongwei Lin ◽  
Xiaobo Du ◽  
Mutian Sun ◽  
...  
Keyword(s):  
High Temperature ◽  
Correlation Analysis ◽  
Softening Point ◽  
Pearson Correlation ◽  
Creep Recovery ◽  
Temperature Characteristics ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Pearson Correlation Analysis ◽  
Fuel Resistance

To effectively evaluate the high-temperature characteristics of a fuel-resistant modified asphalt (FRMA), five different types of asphalt were selected, and a fuel-resistant modifier (FRM) was added to the asphalt to prepare five kinds of FRMA, and the fuel resistance of the 10 above-mentioned asphalt samples was then evaluated. Moreover, the high-temperature performance of different asphalt samples was explored, the influences of the FRM on the penetration, softening point, and rheological indexes of the different asphalt samples were analyzed. A Pearson correlation analysis was conducted on the different high-temperature indexes. Based on the results, compared with the original asphalt, the fuel resistance of the FRMA was improved by about 22% on average; the FRM was able to reduce the penetration, phase angle, and non-recoverable creep compliance of the asphalt; increase the softening point, complex modulus, rutting factors, and creep recovery; and effectively improve the high-temperature performance of the asphalt. However, as the temperature increased, the effect of the FRM on the improvement of the high-temperature performance of the asphalt declined. In addition, compared with the base asphalt, the FRM exerted a more significant effect on the rheological properties of the modified asphalt. According to the Pearson correlation analysis of the high-temperature indexes, apart from penetration, the softening point and rheological indexes featured excellent accuracy and applicability in the evaluation of the high-temperature performance of FRMAs.

scholarly journals Validation of Adhesive and Temperature Property Characteristics of Microsurfacing by Performance-Based Mixture Design Approach

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4532
Author(s):  
Jicun Shi ◽  
Shili Jia ◽  
Lan Wang ◽  
Qing Zhang ◽  
Hongxing Han ◽  
...  
Keyword(s):  
Low Temperature ◽  
Design Method ◽  
Test Methods ◽  
Mixture Design ◽  
Creep Recovery ◽  
Temperature Property ◽  
Temperature Resistance ◽  
Temperature Performance ◽  
Novel Approach ◽  
Low Temperature Resistance

Performance-based mixture design of microsurfacing offers a promising solution to the best application of asphalt emulsions. The presented study investigated a novel approach to evaluate the spalling resistance and high and low-temperature resistance of microsurfacing. The laboratory tests, including mixture bond strength (MBS), driving wheel pavement analyzer (DWPA), multi-stress creep recovery (MSCR), load wheel rutting (LWR), and single edge notch beam (SENB) were conducted to characterize the performance-related properties; the response surface method (RSM) was used to obtain the optimal proportions of the mixture. According to the experimental results, the performance-based mixture design method improves the comprehensive performance of microsurfacing, such as adhesion at high and low temperatures. The results of RSM show that temperature is the most important factor that affects the adhesion of mixture. There is a strong correlation between adhesive and temperature performance detected by different test methods. Due to different chemical mechanisms caused by cement and emulsified asphalt, the high-temperature performance index of the microsurfacing mixture is lower than that of HMA. Furthermore, the low-temperature resistance is analyzed and suggested indicator is proposed.

Preparation and performance characteristics of reduced graphene oxide modified asphalt

2021 ◽  
Vol 11 (9) ◽  
pp. 1579-1586
Author(s):  
Zixuan Chen ◽  
Xudong Li ◽  
Jie Xie ◽  
Jianzhong Pei ◽  
Chengchao Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
High Temperature ◽  
Low Temperature ◽  
Reduced Graphene Oxide ◽  
Softening Point ◽  
Medium Temperature ◽  
Modified Asphalt ◽  
Reduced Graphene ◽  
And Performance

Reduced graphene oxide (RGO) was self-prepared by the oxidation reduction method and then characterized by several tests known as Fourier Transform Infrared Spectroscopy (FTIR) test, scanning electron microscopy (SEM) test, transmission electron microscopy (TEM) test, elemental analysis, raman measurement and thermogravimetry (TG) analysis to evaluate the properties of RGO. Additionally, RGO modified asphalt was prepared in this research to study the influence of RGO on matrix asphalt. Some of the normal performances of RGO modified asphalt were studied in terms of penetration at medium temperature, penetration index (PI), softening point, equivalent softening point T800 at high temperature and ductility at low temperature. Results showed that the prepared RGO has obvious layer structures and good properties and the performance of RGO modified asphalt at high temperature has increased significantly while the performance at low temperature decreased slightly. This research can provide an insight for the further study of RGO modified asphalt to enhance its road performance.

Research on Enzymatic Hydrolysis Lignin Modified Petroleum Asphalt

2011 ◽  
Vol 306-307 ◽  
pp. 1080-1083 ◽  
Author(s):  
Zhi Dong Zhao ◽  
Yao Xie ◽  
Xian Su Cheng ◽  
Yan Qiao Jin ◽  
Ming Yang Xu
Keyword(s):  
Enzymatic Hydrolysis ◽  
Low Temperature ◽  
Physical Properties ◽  
Softening Point ◽  
Hydrolysis Lignin ◽  
Petroleum Asphalt ◽  
Modified Asphalt ◽  
Penetration Index ◽  
Temperature Performance ◽  
Brittle Point

In this paper, a series of enzymatic hydrolysis lignin modified petroleum asphalts were prepared. The physical properties such as softening point, ductility at low temperature and penetration of the modified asphalt were investigated. The penetration index of asphalt modified with EHL was higher than that of unmodified asphalt, equivalent softening point increased and equivalent brittle point decreased with the increase of EHL amount, which showed that the addition of EHL was favorable to reduce the temperature susceptivity of asphalt. When the EHL was 4%, the ductility was 39.0 cm. Meanwhile, low temperature performance of asphalt could be further improved by adding EHL and a small amount of SBS.

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