Mechanism of physical hardening on the fracture characteristics of polymer-modified asphalt binder

Zhang, Lei; Shan, Mingyu; Xing, Chao; Cui, Yongchang; Wang, Peng; Liu, Mingpeng

doi:10.1016/j.conbuildmat.2023.134091

Cited by 33 publications

(2 citation statements)

References 47 publications

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“…Thermogravimetric analysis and differential scanning calorimetry are effective techniques for studying the thermal degradation properties of asphalt. − As illustrated in Figure , Zhao et al observed that evaporation of light alkanes begins above 100 °C, followed by increased decomposition between 300 and 500 °C, resulting in the cracking of heavier molecules into smaller volatile fragments. The activation energy, which serves as an indicator of temperature susceptibility, is found to be the lowest for saturated species and the highest for polar resins/asphaltenes. , This confirms that the volatility of asphalt is influenced by factors such as the molecular weight, structure, and bonding forces …”

Section: Release Mechanism Of Asphalt Vocsmentioning

confidence: 99%

Emission Characteristics, Environmental Impacts, and Health Risks of Volatile Organic Compounds from Asphalt Materials: A State-of-the-Art Review

Li,

Qin,

Zhang

et al. 2024

Energy Fuels

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The emission of volatile organic compounds (VOCs) from asphalt during construction processes presents substantial risks to human health and the environment. To advance sustainable transportation development, this review offers a comprehensive study of the methods for characterization, release characteristics, influencing factors, release mechanisms, and environmental impacts of asphalt VOCs. At present, research has been conducted on characterization methods, component characteristics, influencing factors, and environmental and health risks. The findings indicate that gas chromatography–mass spectrometry is the most comprehensive method for characterizing asphalt VOCs. Asphalt VOCs mainly comprise alkanes, aromatics, and aliphatic hydrocarbons. Factors including the temperature, asphalt source, and ultraviolet radiation can all affect the release characteristics of asphalt VOCs. Elevated VOC levels contribute to the photochemical production of ozone and fine particulate matter, exacerbating air pollution and climate change. Additionally, specific asphalt VOCs, including benzene and polycyclic aromatic hydrocarbons, pose health risks to humans. While progress has been achieved in the current research, challenges persist in quantifying VOCs, assessing their environmental impacts and health risks, and implementing effective mitigation technologies. To address these challenges, future research should focus on establishing asphalt VOC fingerprints, quantitative methods, evaluation criteria, material innovation, optimization of construction processes, exposure assessment, and collaborative solution implementation.

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Section: Release Mechanism Of Asphalt Vocsmentioning

confidence: 99%

Emission Characteristics, Environmental Impacts, and Health Risks of Volatile Organic Compounds from Asphalt Materials: A State-of-the-Art Review

Li,

Qin,

Zhang

et al. 2024

Energy Fuels

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“…An increasing number of scholars are focusing on researching environmentally friendly materials used in the preparation of UHPC. Examples include using crumb rubber [ 8 , 9 , 10 ] and recycled concrete [ 11 ] as substitutes for certain fine aggregates and utilizing fly ash to partially replace cement [ 12 ], among other methods. These efforts aim to reduce costs, protect the environment, and simultaneously enhance the mechanical properties of the materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Composition Characteristics on Mechanical Properties of UHPMC Based on Response Surface Methodology and Acoustic Emission Monitoring

Chen,

Jiao,

Xiao

et al. 2024

Materials

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Manufactured sand (MS) is a promising alternative aggregate to quartz sand (QS) in ultra-high-performance concrete (UHPC) in the preparation of ultra-high-performance manufactured sand concrete (UHPMC), which possesses the characteristics of high strength, low cost, and environmental friendliness. In this study, the effects of variable compositional characteristics including the water–binder ratio, the stone powder (SP) content, and the MS replacement ratio on the mechanical and flexural strength of UHPMC were compared and analyzed based on response surface methodology (RSM). Meanwhile, the damage characteristics of UHPMC during compressive and flexural stress were monitored and evaluated using acoustic emission (AE) technology. The results reveal that the compressive and flexural strengths of UHPMC are both negatively correlated with the water–binder ratio, while they are positively correlated with the MS replacement rate. They tend to firstly increase and subsequently decrease with the increase in the stone powder content. In the load–displacement curve of concrete with a high MS replacement ratio and a low water–binder ratio, the slope in the elastic stage is steeper, the stiffness is higher, and the bending toughness and ductility are also better. The specimens with a 10% to 0% stone powder content present a steeper elastic phase slope, a slightly higher stiffness, and superior ductility. The specimens with a low MS replacement ratio and a high water–binder ratio display earlier cracking and weaker resistance, and the destruction process is complex and very unstable. The damage mode analysis based on RA-AF shows that an increase in the MS replacement ratio and a decrease in the water–binder ratio can both reduce the tensile cracking of UHPMC specimens under a four-point bending test. Although 10% stone powder can marginally slow down crack growth, the failure mode is not significantly affected.

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Optimal integration of phase‐change microcapsules and nano‐silica for improving the strength of phase‐change concrete

Li,

Ye,

Tan

et al. 2024

Polymer International

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Phase‐change microcapsules, consisting of urea‐melamine‐formaldehyde as the shell material and n‐tetradecane as the core material, offer effective temperature regulation within concrete under low‐temperature conditions, mitigating the impact of freeze–thaw cycles. However, their incorporation can exert a notable influence on concrete strength. In this study, microcapsules were utilized as an admixture, and nano‐silicon dioxide replaced an equivalent amount of cement to prepare modified phase‐change concrete, focusing on investigating mechanical properties. Results indicate that under consistent parameters ‐ emulsifier concentration of 10% and an oil–water ratio of 1:6 ‐ the produced microcapsules exhibited uniform dispersion, with particle sizes ranging from 10 μm to 20 μm and latent heat of phase‐change reaching 117 J/g. Incorporating microcapsules reduced concrete strength, with a decrease in compressive strength within the range of 15% when microcapsule dosage was set at 10%. On the other hand, nano‐silica demonstrated the capability to significantly enhance the strength of phase‐change concrete by 15% to 30% at dosages ranging from 5% to 10%. Optimal enhancement in concrete strength was achieved when phase‐change microcapsules were dosed at 10%, and nano‐silica replaced 10% of the cement mass, resulting in compressive strength reaching 90% of normal concrete.This article is protected by copyright. All rights reserved.

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Mechanism of physical hardening on the fracture characteristics of polymer-modified asphalt binder

Cited by 33 publications

References 47 publications

Emission Characteristics, Environmental Impacts, and Health Risks of Volatile Organic Compounds from Asphalt Materials: A State-of-the-Art Review

Emission Characteristics, Environmental Impacts, and Health Risks of Volatile Organic Compounds from Asphalt Materials: A State-of-the-Art Review

Effect of Composition Characteristics on Mechanical Properties of UHPMC Based on Response Surface Methodology and Acoustic Emission Monitoring

Optimal integration of phase‐change microcapsules and nano‐silica for improving the strength of phase‐change concrete

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