Influence of Emulsified Asphalt on the Mechanical Property and Microstructure of Cement-Stabilized Gravel under Freezing and Thawing Cycle Conditions

Wang, Yiqi; Tan, Yiqiu; Guo, Meng; Wang, Xinglong

doi:10.3390/ma10050504

Cited by 21 publications

(14 citation statements)

References 15 publications

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“…A similar tendency was observed by Meidani et al [11,16,17], and it can be explained by the large size and the high strength of the gravels. Thelarger the size of the gravels, the less contacting points in the CGM at the given volume, and the higher the strength, the better the gravels can transfer the shear wave than clay [39,40]. Hence, a greater referent shear strain appeared in the CGMs with the increase of gravel contents.…”

Section: Referent Shear Strainmentioning

confidence: 99%

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

et al. 2020

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In order to support the dynamic design of subgrade filling engineering, an experiment on the dynamic shear modulus (G) and damping ratio (D) of clay-gravel mixtures (CGMs) was carried out. Forty-two groups of resonant column tests were conducted to explore the effects of gravel content (0%, 10%, 20%, 30%, 40%, 50%, and 60%, which was the mass ratio of gravel to clay), gravel shape (round and angular gravels), and confining pressure (100, 200, and 300 kPa) on the dynamic shear modulus, and damping ratio of CGMs under the same compacting power. The test results showed that, with the increase of gravel content, the maximum dynamic shear modulus of CGMs increases, the referent shear strain increases linearly, and the minimum and maximum damping ratios decrease gradually. In CGMs with round gravels, the maximum dynamic shear modulus and the maximum damping ratio are greater, and the referent shear strain and the minimum damping ratio are smaller, compared to those with angular gravels. With the increase of confining pressure, the maximum dynamic shear modulus and the referent shear strain increase nonlinearly, while the minimum and maximum damping ratios decrease nonlinearly. The predicting equation for the dynamic shear modulus and the damping ratio of CGMs when considering confining pressure, gravel content, and shape was established. The results of this research may put forward a solid foundation for engineering design considering low-strain-level mechanical performance.

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Section: Referent Shear Strainmentioning

confidence: 99%

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

et al. 2020

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“…Due to various adverse factors, such as pounding and impact [49], chloride diffusion [50] and corrosion [51,52], and freeze and thaw [53,54], roadways are subject damages, such as potholes and cracks, which will negatively impact traffic flow [55], generating abnormal traffic patterns, such as sudden slow down and lane changes, which will worsen over time. Therefore, a spatiotemporal data mining approach by using the historical data will be developed.…”

Section: Identify Certain Roadway Damagesmentioning

confidence: 99%

Identify Road Clusters with High-Frequency Crashes Using Spatial Data Mining Approach

2019

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This paper develops a three-step spatial data mining approach to directly identify road clusters with high-frequency crashes (RCHC). The first step, preprocessing, is to store the roads and crashes in a spatial database. The second step is to describe the conceptualization of road–road and crash–road spatial relationships. The spatial weight matrix of roads (SWMR) is constructed to describe the conceptualization of road–road spatial relationships. The conceptualization of crash–road spatial relationships is established using crash spatial aggregation algorithm. The third step, spatial data mining, is to identify RCHC using the cluster and outlier analysis (local Moran’s I index). This approach was validated using spatial data set including roads and road-related crashes (2008–2018) from Polk County, IOWA, U.S.A. The findings of this research show that the proposed approach is successful in identifying RCHC and road outliers.

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“…Wang et al (2015) evaluated various properties of fresh cement-emulsified asphalt mortar and found that increasing the asphalt/cement ratio significantly reduced the compressive strength of the mortar. A further investigation of the properties of cement-stabilized gravel modified by emulsified asphalt (Wang et al, 2017) revealed that cement-emulsified asphalt-stabilized gravel with 5 wt% cement performed well both mechanically and in terms of frost resistance. And some recent studies show that surfactants also have a good effect on increasing the strength of cement asphalt emulsion mixture (Ouyang et al, 2018(Ouyang et al, , 2019Yang et al, 2020).…”

Section: Introductionmentioning

confidence: 98%

Study of Pavement Performance of Thin-Coat Waterborne Epoxy Emulsified Asphalt Mixture

et al. 2020

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Waterborne epoxy emulsified asphalts (WEEA) have high densities, good chemical stabilities, and high viscosities. However, they have problems in terms of overly high stiffness and low-temperature brittleness when applied as thin-coat asphalt mixtures. In this study, testing was conducted to obtain the optimal mixing ratio for WEEA. Anti-sliding, rutting, water stability, Cantabro, and low-temperature bending tests were carried out to evaluate the performance of thin coating layers formed from open graded friction course (OGFC)-5 WEEA mixtures, with the results indicating that the optimal ratio of waterborne epoxy resin emulsion and curing agent was 2:1 and that the dosage of waterborne epoxy resin should be maintained between 15 and 30%. The surface texture depth and British Pendulum Number (BPN) of the OGFC-5 WEEA mixtures were larger than 0.91 mm and 77.4, respectively, and the WEEA mixtures had better water stabilities and spalling resistance performance than a mixture without WEEA. Waterborne epoxy resin dosages of 15 and 30% resulted in WEEA mixture stabilities of up to 4,285 and 8,798 times/mm, respectively, and tensile strengths at −10 • C of 2.204 and 4.727 MPa, respectively. The relatively good pavement functional and low-temperature performance of the optimized OGFC-5 WEEA mixture suggest its usefulness as a pavement maintenance material.

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Influence of Emulsified Asphalt on the Mechanical Property and Microstructure of Cement-Stabilized Gravel under Freezing and Thawing Cycle Conditions

Cited by 21 publications

References 15 publications

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

Identify Road Clusters with High-Frequency Crashes Using Spatial Data Mining Approach

Study of Pavement Performance of Thin-Coat Waterborne Epoxy Emulsified Asphalt Mixture

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