scholarly journals Study on Conventional and Rheological Properties of Corn Stalk Bioasphalt/PPA Composite Modified Asphalt

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Fuhai Wang ◽  
Tuo Huang ◽  
Gongfeng Xin ◽  
Minghao Mu ◽  
Quanjun Shen
Keyword(s):  
High Temperature ◽  
Asphalt Binder ◽  
Waste Utilization ◽  
Temperature Behavior ◽  
Corn Stalk ◽  
Modified Asphalt ◽  
Infrared Reflection ◽  
Negative Effect ◽  
New Type ◽  
Asphalt Performance

As a new type of pavement material, bioasphalt has received more and more attention. However, the high-temperature behavior of bioasphalt is poor after blending with asphalt binder. In order to solve this problem and facilitate the waste utilization and resource conservation, the corn stalk bioasphalt/PPA composite modified asphalt was proposed. The conventional performance tests and rheological tests were conducted to evaluate high-temperature and low-temperature behavior. Fourier transform infrared reflection (FTIR) test was undertaken to analyze the mechanism of modified asphalt. The results indicated that blended asphalt penetration and ductility gradually decrease with the PPA content increasing. The softening point and viscosity of the modified asphalt increased, which led to an improvement of blended asphalt’s rigidity. The PPA increased the rutting index of corn stalk bioasphalt/PPA composite modified asphalt. However, bioasphalt had a negative effect on its high-temperature performance. The corn stalk bioasphalt/PPA composite modified asphalt could meet the specification requirement at −18°C considering the creep rate and stiffness modulus, indicating it had outstanding crack resistance. When the PPA and bioasphalt respect to the weight of neat asphalt were 6%–8% and 10%–16%, respectively, the corn stalk bioasphalt/PPA composite modified asphalt performance was optimal. However, shear time and shear rate merely affected the proposed modified asphalt performance. The bioasphalt did not affect the chemical structure of asphalt. However, PPA generated new functional groups (P-O single bond, phosphate (RO)3P = O, and P=O double bond) causing a chemical modification in the asphalt binder. This study can provide a basis for applying bioasphalt, making road engineering more economical and environmentally friendly.

scholarly journals Greener Solution to Waste Corn Stalks and Shortage of Asphalt Resource: Hydrochar Produced by Hydrothermal Carbonization as a Novel Performance Enhancer for Asphalt Binder

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1427
Author(s):  
Xiaoming Wu ◽  
Chichun Hu
Keyword(s):  
High Temperature ◽  
Reaction Temperature ◽  
Storage Stability ◽  
Asphalt Binder ◽  
Aging Effect ◽  
Experimental Tests ◽  
Hydrothermal Carbonization ◽  
Modified Asphalt ◽  
Direct Combustion ◽  
Aging Property

Utilization of waste corn stalks (CS) has seized extensive attention due to high annual output and hazardous impact of piling aside or direct combustion on environment. However, previously there has been a lot of emphasis on improvement of its energy efficiency as solid fuel while limited investigations are available which explore the possibility of applying corn stalks as performance enhancer in asphalt binder. The purpose of this study is to examine the potential of employing hydrochar as modifiers in asphalt binder by a series of experimental tests. In this study, two hydrochar were produced from corn stalks by a novel process called hydrothermal carbonization at a different reaction temperature. The two hydrochar and their responding hydrochar-modified asphalt (HCMA) were tested by chemical and rheological tests. Chemical analysis detected the interaction between hydrochar and binder factions, resulting in poor compatibility but satisfying anti-aging property. Even though hydrochar increased the viscosity of bitumen, implying worse workability, and caused poor storage stability, ameliorated performance of asphalt binder at high temperature by incorporating hydrochar was verified by various criteria such as higher performance grade (PG) failure temperature and lower non-recoverable creep compliance (Jnr). Moreover, higher reaction temperature makes hydrochar’s particles smaller and more homogeneous, which results in slightly lower enhanced high temperature performance, more satisfying workability, better storage stability, and greater anti-aging effect of hydrochar-modified asphalt. Eventually, this study provided a promising win-win solution to environment problems concerning corn stalk treatment and shortage of asphalt binder. Further exploration of methods to improve HCMA’s storage stability, real-scale corroboration on trial section and life cycle assessment of asphalt pavement containing hydrochar modifiers will be followed in the future.

scholarly journals Experimental Study to Determine the Most Preferred Additive for Improving Asphalt Performance Using Polypropylene, Crumb Rubber, and Tafpack Super in Medium and High-Temperature Range

2019 ◽  
Vol 9 (8) ◽  
pp. 1567 ◽  
Author(s):  
Huang Xiaoming ◽  
Ismail Bakheit Eldouma
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Mechanical Performance ◽  
Asphalt Binder ◽  
Crumb Rubber ◽  
Asphalt Binders ◽  
Modified Bitumen ◽  
Asphalt Modification ◽  
Rotational Viscosity ◽  
Asphalt Performance

The overall objectives of this study were to determine the most appropriate additive for improving the physical properties and the medium- and high-temperature performances (mechanical performance) of asphalt binders. Three different types of modified binders were prepared: crumb rubber modifier (CRM), polypropylene (PP), and tafpack super (TPS), which had concentrations of 2%, 3%, 3.5%, and 4% by weight of asphalt binder, for each modifier. Their physical and rheological properties were evaluated by applying various tests such as ductility, rotational viscosity, toughness, and tenacity, as well as the dynamic shear rheometer (DSR) test. As a result, the physical properties of the modified bitumen binders were compared, as were the medium- and high-temperature performances (mechanical performance), which had temperatures of 58, 64, 70, 76, 82, and 88 °C, respectively. This was how the most appropriate modifier was determined. The results demonstrated that the asphalt binder properties significantly improved by utilizing CRM followed by PP and TPS modifiers. The increase in the rutting parameter (G*/sin(δ)) after asphalt modification indicated its excellent performance at both medium- and high-temperatures. Lastly, the CRM was determined as the most preferred additive because of its positive effect on the physical properties and enhancement of the medium- and high-temperature performance (mechanical performance).

scholarly journals Application of biochar from crop straw in asphalt modification

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0247390
Author(s):  
Xinli Gan ◽  
Wenli Zhang
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
High Temperature ◽  
High Speed ◽  
Asphalt Binder ◽  
Crop Straw ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Asphalt Modification ◽  
Scanning Electron

The objective of this study is to verify the feasibility of using biochar made from crop straw as a bitumen additive to improve some properties of bitumen. The differences between crop straw biochar prepared in a laboratory and commercial charcoal were investigated through scanning electron microscopy and laser particle size analyses. Furthermore, biochar-modified asphalt was prepared using the high-speed shear method, and the penetration, softening point, ductility at 15°C, and apparent viscosity of the asphalt binder with 6% biochar were measured at 120, 135, 150, 160, and 175°C. It was found that both the crop straw biochar and the commercial charcoal consist mainly of C, O, Si, and K, but the C content of crop straw biochar is slightly higher than that of commercial charcoal. The particle size of biochar is smaller than that of commercial charcoal, while the specific surface area is larger. It was determined that the addition of crop straw biochar significantly improved the high-temperature performance of asphalt, and that biochar and commercial charcoal have a similar influence on the high temperature performance of asphalt.

scholarly journals Effect of Recycled Shell Waste as a Modifier on the High- and Low-Temperature Rheological Properties of Asphalt

2021 ◽  
Vol 13 (18) ◽  
pp. 10271
Author(s):  
Yuchen Guo ◽  
Xuancang Wang ◽  
Guanyu Ji ◽  
Yi Zhang ◽  
Hao Su ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Rheological Properties ◽  
Low Temperatures ◽  
High Speed ◽  
Permanent Deformation ◽  
Asphalt Binder ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Temperature Performance

The deteriorating ecological environment and the concept of sustainable development have highlighted the importance of waste reuse. This article investigates the performance changes resulting from the incorporation of shellac into asphalt binders. Seashell powder-modified asphalt was prepared with 5%, 10%, and 15% admixture using the high-speed shear method. The microstructure of the seashell powder was observed by scanning electron microscope test (SEM); the physical-phase analysis of the seashell powder was carried out using an X-ray diffraction (XRD) test; the surface characteristics and pore structure of shellac were analyzed by the specific surface area Brunauer-Emmett-Teller (BET) test; and Fourier infrared spectroscopy (FTIR) qualitatively analyzed the composition and changes of functional groups of seashell powder-modified asphalt. The conventional performance index of seashell powder asphalt was analyzed by penetration, softening point, and ductility (5 °C) tests; the effect of seashell powder on asphalt binder was studied using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR) at high and low temperatures, respectively. The results indicate the following: seashell powder is a coarse, porous, and angular CaCO3 bio-material; seashell powder and the asphalt binder represent a stable physical mixture of modified properties; seashell powder improves the consistency, hardness, and high-temperature performance of the asphalt binder but weakens the low-temperature performance of it; seashell powder enhances the elasticity, recovery performance, and permanent deformation resistance of asphalt binders and improves high-temperature rheological properties; finally, seashell powder has a minimal effect on the crack resistance of asphalt binders at very low temperatures. In summary, the use of waste seashells for recycling as bio-modifiers for asphalt binders is a practical approach.

scholarly journals Preparation and Performance Analysis of High-Viscosity and Elastic Recovery Modified Asphalt Binder

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Liangchen Qu ◽  
Yingli Gao ◽  
Hui Yao ◽  
Dandan Cao ◽  
Ganpeng Pei ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Elastic Recovery ◽  
Asphalt Binder ◽  
Temperature Stability ◽  
Crumb Rubber ◽  
High Viscosity ◽  
High Temperature Stability ◽  
Modified Asphalt ◽  
And Performance

This study presented the preparation and performance of a kind of high viscosity and elastic recovery asphalt (HVERA) by using some modifiers. The performance of styrene-butadiene-styrene (SBS), rock asphalt (RA), crumb rubber (CR), and stabilizing agent (SA) for different modifiers was investigated by conventional binder test. Effects of modifiers on the high- and low-temperature properties of HVERA were investigated. The dynamic viscosity (DV) test, dynamic shear rheometer (DSR), and bending beam rheometer (BBR) analysis indicated that the high- and low-temperature rheological properties of asphalt were improved attribute to the addition of mixture of modifiers. Meanwhile, the short-term aging and long-term aging were simulated by rolling thin film oven (RTFO) and pressure aging vessel (PAV) tests. Furthermore, the Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) measurements were conducted for obtaining the mechanism and microstructure distribution of the modified asphalt binders. From the test results in this study, it was evident that the addition of SBS, RA, CR, and SA into a neat asphalt binder could both significantly improve the viscosity of the binder at high temperature and lower the creep stiffness at low temperature, which was beneficial to better both high-temperature stability and low-temperature cracking resistance of asphalt pavements. It was proved that the high temperature grade of HVERA could be increased by increasing of RA and a proper percentage of modifiers could be improved by the low temperature grade of HVERA.

High-temperature performance of gilsonite-modified asphalt binder and asphalt concrete

2016 ◽  
Vol 34 (21) ◽  
pp. 1783-1789 ◽  
Author(s):  
Aliasghar Akbari Nasrekani ◽  
Koorosh Naderi ◽  
Mostafa Nakhaei ◽  
Nader Mahmoodinia
Keyword(s):  
High Temperature ◽  
Asphalt Concrete ◽  
Asphalt Binder ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Modified Asphalt Binder

scholarly journals Effect of Warm-Mix Agent EC-120 on Performance of Asphalt Binder and Its Microscopic Mechanism

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Tian Xiaoge ◽  
Ren Zhang ◽  
Yichao Xv ◽  
Yantian Chu ◽  
Zhen Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Asphalt Binder ◽  
Warm Mix Asphalt ◽  
Performance Tests ◽  
Mixing Process ◽  
Microscopic Mechanism ◽  
Modified Asphalt ◽  
Infrared Spectrometer ◽  
Sbs Modified Asphalt

In order to figure out the influence of the warm-mix agent EC-120 on the performance of the asphalt binder and its micro mechanism in warm-mixing process, a matrix asphalt, A-70, and SBS-modified asphalt, SBS I-D, were modified with different contents of EC-120, respectively. Then, conventional macromechanic performance tests, dynamic shear rheological (DSR) test at high-temperature, and bending beam rheological (BBR) test at low-temperature were carried out on asphalt binder samples. Meanwhile, they were microscopically analyzed through Fourier transform infrared spectrometer (FTIR) and differential scanning calorimeter (DSC). The results indicated that EC-120 can reduce the viscosity of asphalt binder at high temperature. With the increase of EC-120 content, the high-temperature rutting resistance of two kinds of warm-mix asphalt (WMA) increased, but their crack resistance at low-temperature was reduced. FTIR indicated that this is due to the generation of oxides containing carbonyl functional groups after EC-120 was blended with asphalt binder. The DSC endothermic curves of WMA binders are obviously different from those of base binders, and a strong endothermic peak appears in the interval of 102°C–113°C, indicating that EC-120 will endothermically melt at the temperature of 102°C∼113°C, so it can play the role in reducing the viscosity of asphalt binder at the range of construction temperatures.

Laboratory Investigation of the High Temperature Rheological Property of Activated Coal Gangue Modified Asphalt Binder

2015 ◽  
Vol 744-746 ◽  
pp. 1261-1265 ◽  
Author(s):  
Xiao Kai Yang ◽  
Rui Xiong ◽  
Fa Yang ◽  
Hui Qing Yin ◽  
Tao Yang
Keyword(s):  
High Temperature ◽  
Asphalt Binder ◽  
Coal Gangue ◽  
Gangue Mineral ◽  
Modified Asphalt ◽  
Industrial Solid Waste ◽  
Activated Coal ◽  
Modified Asphalt Binder ◽  
Mineral Powder ◽  
Activated Coal Gangue

The coal gangue is one of the largest industrial solid waste emissions in our country at present, the research about making coal gangue as the filler to modify the properties of asphalt is still blank both at home and abroad. Using rotational viscosity test and dynamic shear rheological test (DSR) to study the high temperature rheological properties of the activated coal gangue modified asphalt binder when under the condition of different filler-bitumen ratio, and compared with mineral powder modified asphalt binder; Based on this, explores the mechanism of coal gangue modified asphalt binder. The results show that the activated coal gangue instead of mineral powder can make the high temperature performance of asphalt binder increases sharply. Research results provide feasible basis of activated coal gangue mineral powder can instead of mineral powder improving the high temperature rheological performance of asphalt binder.

scholarly journals Performance Evaluation of Bone Glue-Modified Asphalt

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Asif Ali ◽  
Naveed Ahmad ◽  
Muhammad Adeel ◽  
Syed Bilal Ahmed Zaidi ◽  
Muhammad Sohail Jameel ◽  
...  
Keyword(s):  
High Temperature ◽  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Cost Effective ◽  
Sem Analysis ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
And Performance ◽  
Bone Glue

Asphalt is one of the primary materials that are extensively used by the pavement industry throughout the world. Its behaviour is highly dependent on the amount of loading and the level of temperature it is exposed to. Asphalt has been modified in the past with different additives to improve its high- or low-temperature properties. In Pakistan, temperature remains high for most of the time of the year; hence, asphalt binders with less susceptibility to higher temperatures are preferred for flexible pavements. Acids, polymers, fibers, and extenders have been used by the researchers to improve high-temperature performance of asphalt mixture. In the present study, a bio material derived from the animal waste, named as bone glue (BG), has been used with the 60/70 penetration grade binder in dosages of 3%, 6%, 9%, and 12% by weight of asphalt binder. The bone glue is produced from a sustainable source. It is a cost-effective and eco-friendly material. Moreover, it produces a durable and nonhazardous asphalt composite. The influence of addition of bone glue on asphalt binder was evaluated using different testing techniques which include consistency tests, rheological analysis, and adhesion tests. Furthermore, different performance tests were conducted on bone glue-modified asphalt mixtures. Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analysis were carried out to ensure the homogeneity and proper mixing of bone glue in asphalt binder. The results from the tests reveal that bone glue stiffens the asphalt binder hence enhancing its high temperature performance. Bone glue dosage of 9% by weight of the binder was found to be the optimum dosage based on the rheological and performance analysis.

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