Prediction of dynamic modulus of asphalt mixture using micromechanical method with radial distribution functions

Zhang, Jiupeng; Fan, Zepeng; Wang, Hao; Sun, Wei; Pei, Jianzhong; Wang, Dawei

doi:10.1617/s11527-019-1348-7

Cited by 81 publications

(18 citation statements)

References 41 publications

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“…And along with physical properties (i.e., water absorption, abrasion and impact) [6][7][8][9], the morphological characteristics of coarse aggregates (i.e., shape, angularity, and surface texture) have a direct correlation with the functional and structural performance of pavement layers [10][11][12][13]. Several researchers have reported coarse aggregates with good morphology can provide enough strength and good structural stability to the asphalt pavement [14][15][16]. Beside the crushed stone aggregate, the recycled aggregates' abrasion resistance and morphological characteristics also have a significant effect on the pavement performances of asphalt mixture [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Comparison of Morphological Characteristics of Various Coarse Aggregates before and after Abrasion Test

et al. 2020

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Under the repeated loading, the continuous impact and friction of tires on aggregates resulted in some changes in their morphology, which may cause rutting, decrease in skid resistance, and fatigue damage of the road. In order to explore specific changes in coarse aggregate morphology, the Los Angeles abrasion test was used to simulate the force exerted on coarse aggregates and the morphologies of different aggregates before and after abrasion were compared. Four types of coarse aggregates were selected and their mineral compositions were analyzed by X-Ray Diffraction (XRD). The morphological characteristics were measured using Aggregate Image Measurement System (AIMS-Ⅱ), including angularity, surface texture, sphericity and Flat and Elongation (F and E) ratio. Results showed that the angularity value for each type of aggregates significantly reduced after abrasion and the angularity reductions of various aggregates were consistent with the results of abrasion test, indicting the angularity reduction was the main component of abrasion loss. Whereas, there was no significant different between the surface texture of coarse aggregates before and after abrasion. For shape properties, both sphericity and F and E ratio results showed that aggregates with excessively high F and E ratio were easy to break, which might cause rutting and were harmful to pavement. Therefore, for pavements with high performance requirement, coarse aggregates with large angularity and low abrasion value should be preferred, whereas the quantity of particles with excessively high F and E ratio should be controlled.

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Section: Introductionmentioning

confidence: 99%

Investigation on Comparison of Morphological Characteristics of Various Coarse Aggregates before and after Abrasion Test

et al. 2020

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“…The hydration products of cement mainly include acicular and reticular hydrated calcium silicate (c-s-h), flaky calcium hydroxide (c-h), and columnar ettringite (c-a-s-h) [34]. As shown in Figures 1 and 2, the hydration products of cement are distributed in the demulsified asphalt, and there are many micropores in the mortar, which are the pores of moisture volatilization after demulsification of emulsified asphalt.…”

Section: Micro-mechanisms Of the Strength Of Cement-emulsified Asphalmentioning

confidence: 99%

Strength and Micro-Mechanism Analysis of Cement-Emulsified Asphalt Cold Recycled Mixture

et al. 2019

Materials

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The strength of EACRM (emulsified asphalt cold recycled mixture) is closely related to the properties and proportion of raw materials. In this paper, the strength formation mechanism of EACRM was first studied through microscopic analysis, and the influence regular of aggregate gradation, emulsified asphalt, water consumption, cement consumption, and other factors on its strength was analyzed through a series of laboratory tests. The analysis results show that the asphalt binder plays the role of cementing material in cement emulsified asphalt mortar. The combination of cement and emulsified asphalt is a physical combination. The hydration product not only increases the viscosity of asphalt cement, but also makes the surface of asphalt cement become uneven, which increases the adhesion area with the aggregate. Therefore, the microstructure of the interface between mortar and aggregate is improved. The bonding force of the interface and the mechanical properties of concrete are improved. Due to the influence of recycled asphalt pavement (RAP) materials, the excessive amount of emulsified asphalt and cement are not conducive to improve the strength of cold recycled mixture. Through experiments, the optimal amount of emulsified asphalt and cement is determined as 2.9% and 1.5%, respectively, for the RAP materials. At the same time, improving the performance of emulsified asphalt and adding quicklime and organic activator are also helpful to improve the strength of a cold recycled mixture.

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“…It can be seen from the above test results that the argument of "black rock" is not sufficient, and the residual asphalt can play a certain bonding role even under cold recycling conditions. In other words, for the old RAP materials, if the compaction can be strengthened in the process of recycling, so that the particles can play a bonding role again by means of the residual aged asphalt film on the surface of the RAP materials, the strength of the recycled mixture will be improved [31].…”

Section: Residual Cohesion Of Rap Materialsmentioning

confidence: 99%

“…particles can play a bonding role again by means of the residual aged asphalt film on the surface of the RAP materials, the strength of the recycled mixture will be improved [31].…”

Section: Strength Of Rap Lumpmentioning

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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Prediction of dynamic modulus of asphalt mixture using micromechanical method with radial distribution functions

Cited by 81 publications

References 41 publications

Investigation on Comparison of Morphological Characteristics of Various Coarse Aggregates before and after Abrasion Test

Investigation on Comparison of Morphological Characteristics of Various Coarse Aggregates before and after Abrasion Test

Strength and Micro-Mechanism Analysis of Cement-Emulsified Asphalt Cold Recycled Mixture

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

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