Nanoindentation characterization of aging gradient of mastic in asphalt mixtures

Yao, Zeheng; Lu, Guilin; Yang, Jun; Gong, Minghui; Zhi-yun, Tang; Xue, Jiayue; Zhang, Xiaorui

doi:10.1016/j.conbuildmat.2019.04.054

Cited by 20 publications

(4 citation statements)

References 18 publications

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“…Based on Cantabro and draindown tests, the optimal bitumen-aggregate ratios (OBRs) of each group were 3.8%, 3.7%, 3.6%, 3.6%, and 3.5%, respectively [32]. Compared with DGAM, PAM reduces bitumen consumption and engineering cost, owing to its less fine aggregate content [33,34]. Another finding is that the OBR decreases slightly with the increase of the replacement level, which is inconsistent with the results obtained by Kavussi et al [35].…”

Section: Mixture Designmentioning

confidence: 99%

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

et al. 2019

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Porous asphalt mixtures with steel slag (PAM-SS), as an eco-friendly and low-cost pavement material, are conducive to addressing the issue of urban floods and natural resource shortages. The primary objective of this paper was to explore the feasibility of the application of PAM-SS for seasonal frozen regions, and ascertain the optimal replacement percentage of natural aggregate. Steel slag coarse aggregate (SSCA) was used to replace basalt coarse aggregate (BCA) at four levels (25%, 50%, 75%, 100%) by equal volume. The volume characteristics, mechanical properties, low-temperature cracking resistance, water stability, and freeze-thaw (F-T) durability of the mixture were assessed. The results indicated that the low-temperature cracking resistance of the mixture was significantly enhanced and acoustic emission (AE) energy was uniformly released by the incorporation of steel slag. Furthermore, the porosity, permeability, Marshall stability (MS), and the resistance against water damage and F-T cycles were also significantly improved. Based on the experimental results, the complete replacement of natural aggregate is advisable to obtain an optimal overall performance.

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Section: Mixture Designmentioning

confidence: 99%

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

et al. 2019

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“…Therefore, some scholars analyzed the influence of time and temperature on asphalt aging and found that the longer the aging time and the higher the temperature, the deeper the aging of asphalt and the worse the paving performance of asphalt mixes [23][24][25][26]. At the same time, in order to further understand the aging process of asphalt, it was found through microscopy that aging causes changes in the chemical functional groups of asphalt, which results in the nanomorphology and micromechanical properties of asphalt being affected [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effect of aging on low-temperature crack resistance and water stability of polyester fiber asphalt mixture

Niu

Chen

2022

Mater. Res. Express

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In order to study the influence of different aging conditions on the low-temperature crack resistance and water stability of polyester fiber asphalt mixture. Prepare standard Marshall specimens of asphalt mixture with 0.4 % polyester fiber doping, and carry out water immersion Marshall test and low temperature splitting test through indoor asphalt mortar aging, asphalt mixture short-term aging and long-term aging. The results show that: under the three aging conditions, when the water immersion and low temperature time are fixed, with the increase of the aging degree, the water stability and low temperature crack resistance of the asphalt mixture decrease. When the immersion time is 2 h, the stability of asphalt mortar aging and short-term aging decreases by 6.0% and 11.8%, respectively, compared with unaging, but the long-term aging is only 3.6% lower than the short-term aging. When the temperature is -5℃, the split tensile strength of asphalt mortar aged and short-term aged increases by 4.24% and 14.35%, respectively, compared with unaging, while long-term aging only increases 4.18% compared with short-term aging. This indicates that the short-term aging condition has the most significant effect on the water stability and low-temperature crack resistance of polyester fiber asphalt mixes. At the same time, this study established a regression equation between the test temperature and the low temperature evaluation index through quadratic fitting (the correlation coefficient is 0.960-0.998), and the regression relationship can be used to estimate the low temperature evaluation index at different test temperatures.

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“…A rigid indenter with a specific shape is pressed into the flat surface of the specimen, and a displacement sensor is used to collect the depth of the indenter pressed into the sample to obtain the load-displacement graph in the loading and unloading process. The mechanical parameters of hardness, modulus and viscoelasticity can be obtained by analyzing the graph with different computational models [ 15 , 16 ]. Tarafder et al [ 17 ] obtained test data suitable for linear elastic analysis by adjusting the loading time and loading rate of the nanoindentation test.…”

Section: Introductionmentioning

confidence: 99%

Cross-Functional Test to Explore the Determination Method of Meso-Parameters in the Discrete Element Model of Asphalt Mixtures

Chen

Wang

et al. 2021

Materials

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In order to obtain more accurate parameters required for the simulation of asphalt mixtures in the discrete element method (DEM), this study carried out a series of cross-functional asphalt mixture experiments to obtain the DEM simulation meso-parameters. By comparing the results of simulation and actual experiments, a method to obtain the meso-parameters of the DEM simulation was proposed. In this method, the numerical aggregate profile was obtained by X-ray CT scanning and the 3D aggregate model was reconstructed in MIMICS. The linear contact parameters of the aggregate and the Burgers model parameters of the asphalt mastic were obtained by nanoindentation technology. The parameters of the parallel bonding model between the aggregate and mastic were determined by the macroscopic tensile adhesion test and shear bond test. The results showed that the meso-parameters obtained by the macroscopic experiment provide a basis for the calibration of DEM parameters to a certain extent. The trends in simulation results are similar to the macro test results. Therefore, the newly proposed method is feasible.

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Nanoindentation characterization of aging gradient of mastic in asphalt mixtures

Cited by 20 publications

References 18 publications

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

Effect of aging on low-temperature crack resistance and water stability of polyester fiber asphalt mixture

Cross-Functional Test to Explore the Determination Method of Meso-Parameters in the Discrete Element Model of Asphalt Mixtures

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