Preparation, properties and modification mechanism of polyurethane modified emulsified asphalt

Sheng, Xiaohui; Wang, Mo; Xu, Tao; Chen, Jun

doi:10.1016/j.conbuildmat.2018.08.177

Cited by 92 publications

(20 citation statements)

References 33 publications

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“…FTIR is an effective method for determining the functional groups in asphalt because each chemical functional group has a unique infrared absorption feature . Figure (a) presents the FTIR spectrum of WCO and BA, it can be observed that the peaks are similar.…”

Section: Resultsmentioning

confidence: 99%

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

Liu

Zhou²,

Peng³

et al. 2019

J of Applied Polymer Sci

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The objective of this research is to investigate the physiochemical and rheological properties of waste cooking oil (WCO)/styrene‐b‐butadiene‐b‐styrene/ethylene vinyl acetate (SBS/EVA) composite modified asphalt. A petroleum asphalt composite modified with SBS/EVA and oil/SBS/EVA were prepared to undergo the physical, rheological, and microscopic experiments. Comparing these tests results with the properties of unmodified petroleum asphalt, SBS and EVA cause an improvement in pavement performance, but weaken the storage stability. Although the high‐temperature performance undermined by the addition of WCO, the thermal stability, fatigue property, and low temperature crack resistance improved obviously. In addition, WCO mainly composed by low‐weight components, and these can supplement the light components in the polymer‐modified asphalt. EVA could increase the percentage of large molecular size of asphalt, while WCO relieves this trend. The reactions between WCO and these polymers (SBS and EVA) are physical reactions. Atomic force microscopy morphology results reflect that SBS and EVA increase the surface complexity and roughness, and WCO makes the asphalt surface smooth. This indicates WCO increases the dispersion of polymers in asphalt. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48828.

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Section: Resultsmentioning

confidence: 99%

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

Liu

Zhou²,

Peng³

et al. 2019

J of Applied Polymer Sci

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“…On the premise of optimum moisture content, vibration compaction was adopted to mold the specimens, and the influence of wetting water on the specimens was researched, that is, whether wetting water needs to be added into RAP materials first. The adding method of emulsified asphalt without adding wetting water is as follows: Firstly, the designed additional wetting water is added into emulsified asphalt, mixing for 45 s, then the mixed emulsion is added into the RAP materials and mixing for 45 s again [35]. The adding method of emulsified asphalt with adding wetting water is as follows: Firstly, the designed additional wetting water is added into the RAP materials, mixing for 45 s, then the quantitative emulsified asphalt is added and mixing for 45 s again.…”

Section: Specimens Preparation With Different Compaction Methodsmentioning

confidence: 99%

Performance Evaluation of Recycled Asphalt Pavement Materials and Cold Recycling Mixtures Designed with Vibratory Compaction Method

et al. 2019

Applied Sciences

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In this paper, the basic composition and performance evaluation of the recycled asphalt pavement (RAP) materials were firstly analyzed, and two methods were proposed to evaluate strength characteristics of RAP materials, including a triaxial method for the residual strength and the mortar cementing method for the strength of RAP lump. Then, the cold recycling technology was applied on RAP materials with emulsified asphalt by using vibratory compaction and heavy-duty compaction methods (Proctor compaction method), and the results showed that the maximum dry density obtained by heavy-duty compaction was closer to the actual situation. Finally, the effects of wetting water, emulsified asphalt dosage and curing conditions on the performance of the specimens were investigated. It was found that when the emulsified asphalt was mixed uniformly, whether or not to add the wetting water have almost no effect on the strength of the molded specimens. When the matrix asphalt content of the emulsified asphalt was 30%~60%, the water could be directly added to the cold recycling mixture. The intensity of accelerated curing for two days at 40 • C was approximately equal to that of natural curing for three days, while that of accelerated curing for three days at 40 • C was approximately equal to that of natural curing for seven days, which provided a basis for the short-term laboratory test. emulsion content, aggregate properties, coating and adhesion tests. Strength testing mainly refer to the indirect tensile strength test, in addition to resistance, moisture-induced damage sensitivity test and rutting test [7]. A. Widayanti et al. used SEM imaging technology to observe the morphology and surface texture of the RAP materials [8]. Also, Y. N. Li et al. evaluated the effects of emulsified asphalt and cement on the porosity, indirect tensile strength, tensile strength ratio, dynamic stability and mechanical properties of RAP materials [9]. X. Zhang made an in-depth research on the RAP materials treatment process from four aspects: Method of recycling RAP materials, selection of crushing equipment, old material screening process, storing and testing [10]. F. Ye et al. researched the layered aging regulation of asphalt stratification on the surface of RAP materials [11]. T. Ma et al. researched the effects of aging properties in asphalt on the performance of 48 RAP materials by measuring the low temperature performance of mortar with bending beam 49 rheometer (BBR) [12].However, there has not been a uniform conclusion on the research of RAP materials compaction methods abroad. Some of the compaction methods are mainly selected according to different design methods of recycling asphalt mixtures. Generally, the Marshall compaction method is used to mold specimens for the Marshall design method. The kneading method is used for Hveem method. The gyratory compaction method is used for Superpave design method, which is more popular in the U.S. and Sweden [13][14][15].H. Y. Wei et al. used the method of vibration compaction specimens and de...

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“…e emulsified asphalt residue was subjected to 10 cycles of 1 second creep and 9 seconds recovery at a stress level of 0.1 kPa, followed by another 10 cycles of creep and recovery at 3.2 kPa. e performance indicators consist of the nonrecoverable compliance (J nr ) and the recovery percent (R), which can be calculated using equations (2) and (3), respectively. e stress sensitivity J nr, diff is the difference between the J nr values at the stress levels of 3.2 kPa and 0.1 kPa, as expressed in equation (4).…”

Section: Multiple Stress Creep Recovery (Mscr)mentioning

confidence: 99%

“…Cold recycled mixture of emulsified asphalt has become one of the most popular approaches for asphalt pavement maintenance, rehabilitation, and reinforcement, with the advantage of excellent pavement performance, resource conservation, and environmental friendliness [1][2][3][4]. Studies have found that the asphalt emulsion has a substantial influence on the rheological characteristics and the mechanical properties of the cold recycled mixture [5,6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Evaporation Methods on the High-Temperature Rheological and Fatigue Performances of Emulsified Asphalt Residues

Sun

Yue

Wang

et al. 2020

Advances in Materials Science and Engineering

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Cold recycling technology is a widely applied asphalt pavement rehabilitation technology. e properties of emulsified asphalt residues after water evaporates play an important role in the performance of the asphalt pavement. is paper investigates the rheological and fatigue properties of emulsified asphalt residues under different evaporation methods. Two different matrix asphalt binders and emulsifiers were selected to prepare the emulsified asphalt. Moreover, the direct heating method (DHM) and the EN13074 and ASTM D7497-09 evaporation methods were used to obtain emulsified asphalt residues. Furthermore, the linear viscoelasticity, the permanent deformation resistance, and the fatigue resistance were evaluated by the temperature sweep and frequency sweep tests, the multiple stress creep recovery (MSCR) test, and the linear amplitude sweep (LAS) test, respectively. e test results show that under the three evaporation conditions, the growth amplitude order of the rutting factor, recovery percent, complex modulus, and fatigue life of emulsified asphalt residues is ASTM D7497-09 > EN13074 > DHM, and as is the attenuation amplitude order of the nonrecoverable creep compliance and phase angle. e results reveal that the evaporation process leads to oxidation and hardening of the residues. e hardening degree of the ASTM D7497-09 evaporation method is higher than that of the EN13074 evaporation method, and the hardening degree of the EN13074 evaporation method is higher than that of the direct heating method. e rheological and fatigue performances of the emulsified asphalt residues depend on the matrix asphalt. Moreover, the residue that was prepared from 70# asphalt has good high-temperature and fatigue properties, but it has higher temperature sensitivity and stress sensitivity.

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Preparation, properties and modification mechanism of polyurethane modified emulsified asphalt

Cited by 92 publications

References 33 publications

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

Investigation of physiochemical and rheological properties of waste cooking oil/SBS/EVA composite modified petroleum asphalt

Performance Evaluation of Recycled Asphalt Pavement Materials and Cold Recycling Mixtures Designed with Vibratory Compaction Method

Investigation of the Effects of Evaporation Methods on the High-Temperature Rheological and Fatigue Performances of Emulsified Asphalt Residues

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