Performance enhancement of modified asphalt via coal gangue with microstructure control

Liu, Shuai; Jin, Jiao; Yu, Huayang; Gao, Yuchao; Du, Yi; X, Sun; Qian, Guoping

doi:10.1016/j.conbuildmat.2022.130287

Cited by 26 publications

(7 citation statements)

References 39 publications

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“…To sum up, the addition of PUA and the increase in dosage promoted the physical and chemical reactions between the isocyanate group in PUA and the hydroxyl and carboxyl groups on the surface of asphaltene, forming stable hydrogen bonds and chemical bonds, thereby increasing the compatibility of PUA modifier and asphalt [ 46 ]. The rutting resistance, deformation resistance, and elastic recovery ability of PUA-MA were also substantially enhanced, with a concentration of 6–9% producing the best high-temperature asphalt performance.…”

Section: Resultsmentioning

confidence: 99%

Modifying Effect and Mechanism of Polymer Powder on the Properties of Asphalt Binder for Engineering Application

Zhao,

Sun,

et al. 2023

Polymers

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For achieving the better modifying effect of polyurethane on asphalt pavement materials, the PUA powder modifier was prepared with fine grinding at the glass transition temperature, and polyurethane-modified asphalt (PUA-MA) with different dosages of modifier was prepared. The impact of the PUA on the physical properties of asphalt binder was studied. The modifying mechanism of PUA on asphalt was explored by investigating the thermal performance and chemical composition of asphalt (thermogravimetric analysis, differential scanning calorimetry test, and Fourier transform infrared spectroscopy). The micrograph of the interactive interface was characterized by scanning an electron microscope. Furthermore, the rheological properties of PUA-MA were also investigated and analyzed. The results indicated that the PUA had a dense structure with few pores on the surface. After mixing with asphalt, it altered the asphalt’s internal structure via physical fusion and chemical reaction (carbamate formation). PUA improved the thermal stability of asphalt, enhanced the asphalt’s thermal decomposition temperature, and further reduced the thermal mass loss while decreasing the glass transition temperature. The addition and dosage increase in the PUA modifier significantly improved the softening point, viscosity, complex shear modulus, and rutting factor of asphalt. Also, the PUA could improve the elastic recovery ability of asphalt and enhance the rutting resistance of asphalt at high temperatures. However, the crack resistance at low temperatures was not effectively improved (ductility and penetration decreased). When the dosage was 6–9%, PUA-MA had the best high-temperature performance, but asphalt showed poor low-temperature performance at this dosage. This study provides a theoretical reference for popularizing and applying polyurethane as an asphalt modifier in road engineering.

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Section: Resultsmentioning

confidence: 99%

Modifying Effect and Mechanism of Polymer Powder on the Properties of Asphalt Binder for Engineering Application

Zhao,

Sun,

et al. 2023

Polymers

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“…The enhanced architecture, depicted in Figure 1, is an evolution of the original Swin-Unet [47][48][49]. It features an improved Swin Transformer arranged in a "U" shape, serving as both the encoder and the decoder.…”

Section: Overview Of the Developed Architecturementioning

confidence: 99%

Pavement Crack Detection Based on the Improved Swin-Unet Model

Chen,

Feng,

Xiao

et al. 2024

Buildings

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Accurate pavement surface crack detection is crucial for analyzing pavement survey data and the development of maintenance strategies. On the basis of Swin-Unet, this study develops the improved Swin-Unet (iSwin-Unet) model with the developed skip attention module and the residual Swin Transformer block. Based on the channel attention mechanism, the pavement crack region can be better captured while the crack feature channels can be assigned more weights. Taking advantage of the developed residual Swin Transformer block, the encoder architecture can globally model the pavement crack feature. Meanwhile, the crack feature information can be efficiently exchanged. To verify the pavement crack detection performance of the proposed model, we compare the training performance and visualization results with the other three models, which are Swin-Unet, Swin Transformer, and Unet, respectively. Three public benchmarks (CFD, Crack500, and CrackSC) have been adopted for the purpose of training, validation, and testing. Based on the test results, it can be found that the developed iSwin-Unet achieves a significant increase in mF1 score, mPrecision, and mRecall compared to the existing models, thereby establishing its efficacy in pavement crack detection and underlining its significant advancements over current methodologies.

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“…The physical adsorption capacity of coal gangue powder activated by the chemical insertion method or high temperature is improved, and the interaction ability with the matrix is enhanced. Therefore, the application of coal gangue powder in asphalt pavement can improve the high-temperature resistance and anti-aging performance [26]. Similarly, it also plays a positive role in self-healing cracks in asphalt mixtures and has a good self-healing effect under microwave heating conditions [27].…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Properties and Mechanisms in Contact-Hardening Behavior of Silica-Alumina Mine Solid Waste

Cheng,

Gu,

et al. 2024

Buildings

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There are some limitations in the application of tuff powder as a supplementary cementitious material (SCM). Exploring its feasibility in new fields will consume a large amount of silica-alumina mine solid wastes. This study has investigated the mechanical properties and mechanism in contact-hardening of tuff powder with a method of compression molding. The compressive strength of specimens was tested, and the X-ray diffraction (XRD), thermogravimetric analysis (TG), scanning electron microscopy (SEM), and Mercury intrusion porosimetry (MIP) methods were used to reveal the mechanism of contact-hardening of tuff powder from a micro-perspective. The results indicated that the compressive strength of specimens was higher when activated by sodium hydroxide compared to calcium hydroxide. Compared to calcium hydroxide, the compressive strength of TFS20 and TFF20 activated by sodium hydroxide was improved by 20% and 23%, respectively. The hydration degree of tuff powder was very low, with a water–cement ratio (w/c) of 0.15, while the hydration degree of coal gangue powder was higher. The results of TGA and SEM indicated that the sodium hydroxide had a better activating effect on slag and fly ash. Therefore, more C-S-H gels were generated in those samples activated by sodium hydroxide. Furthermore, the structure of samples was more compacted, and there was a reduction of porosity by 10% and 11% for TFS20 and TFF20, respectively, especially the proportion of harmful pores.

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Performance enhancement of modified asphalt via coal gangue with microstructure control

Cited by 26 publications

References 39 publications

Modifying Effect and Mechanism of Polymer Powder on the Properties of Asphalt Binder for Engineering Application

Modifying Effect and Mechanism of Polymer Powder on the Properties of Asphalt Binder for Engineering Application

Pavement Crack Detection Based on the Improved Swin-Unet Model

The Mechanical Properties and Mechanisms in Contact-Hardening Behavior of Silica-Alumina Mine Solid Waste

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