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学者姓名：郭猛
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摘要 ：
3D打印技术是一种以建模软件为基础,通过使用粘合材料来进行三维打印的技术.本文对3D打印技术的分类和应用进行了介绍,总结了3D打印技术在道路工程上的应用现状,包括道路修复、道路材料和道路施工三个方面,并对未来的研究方向进行了展望.
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| GB/T 7714 | 郭猛 , 任鑫 . 3D打印技术在道路工程的应用综述 [J]. | 中国建材科技 , 2021 , 30 (3) : 60-62 . |
| MLA | 郭猛 等. "3D打印技术在道路工程的应用综述" . | 中国建材科技 30 . 3 (2021) : 60-62 . |
| APA | 郭猛 , 任鑫 . 3D打印技术在道路工程的应用综述 . | 中国建材科技 , 2021 , 30 (3) , 60-62 . |
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摘要 ：
In order to analyze the anti-reflective cracking performance of a full-depth asphalt pavement and study the propagation process of a reflection crack and its influencing factors, a mechanical model of pavement structural crack analysis was established based on the ABAQUS finite element software and the extended finite element method (XFEM). Based on two different loading modes of three-point bending and direct tension, the propagation process of a reflection crack is analyzed. The results show that the anti-reflective cracking performance of a full-depth asphalt pavement is better than that of a semi-rigid base pavement structure, and the loading mode II based on direct tension is more consistent with the propagation mechanism of pavement reflection cracks, while the loading mode II is more suitable for analyzing the anti-reflective cracking performance of the pavement structure. Appropriately reducing the elastic modulus of the stress-absorbing layer can significantly improve the anti-reflective cracking performance of the full-depth asphalt pavement.
关键词 ：
full-depth asphalt pavement full-depth asphalt pavement stress-absorbing layer stress-absorbing layer reflective cracking reflective cracking extended finite element method extended finite element method
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| GB/T 7714 | Hou, Fujin , Li, Tao , Li, Xu et al. Research on the Anti-Reflective Cracking Performance of a Full-Depth Asphalt Pavement [J]. | SUSTAINABILITY , 2021 , 13 (17) . |
| MLA | Hou, Fujin et al. "Research on the Anti-Reflective Cracking Performance of a Full-Depth Asphalt Pavement" . | SUSTAINABILITY 13 . 17 (2021) . |
| APA | Hou, Fujin , Li, Tao , Li, Xu , Li, Yunliang , Guo, Meng . Research on the Anti-Reflective Cracking Performance of a Full-Depth Asphalt Pavement . | SUSTAINABILITY , 2021 , 13 (17) . |
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摘要 ：
Asphalt binder is a complex compound comprising a diverse and intricate range of hydrocarbons which makes it difficult to accurately ascertain its chemical structure. This study aimed to analyze the chemical composition of asphalt binder and establish an accurate molecular structure model of unaged asphalt binder fractions. An unaged asphalt binder was separated into four fractions based on their polarities, referred to as saturates, aromatics, resins and asphaltenes (SARA fractionation). A combination of results from analytical techniques including Fourier transform infrared spectrometer, 1H-Nuclear magnetic resonance, Gel permeation chromatography and Elemental analysis was used to analyze the chemical composition of the different fractions of asphalt binder. The parameters relating to the average molecular structure were calculated to construct an average molecular structure using an improved Brown-Ladner method. The results show that the improved Brown-Ladner method can be used to obtain the effective average molecular structure of the SARA fractions. This study also provides, perhaps for the first time, model molecular structures for each polar fraction using real asphalt binder samples that can be used in future studies on molecular modeling and simulation. The average molecular structure of saturates was seen to be relatively simple. However, there were many unsaturated aromatic compounds and polar functional groups in resins and asphaltenes. The presence of carbonyl groups in resins indicated that it could be more easily aged than other fractions. The average molecular weight increased from several hundred to nearly two thousand with an increase in polarity of the fraction (saturates, aromatics, resins, and asphaltenes). Similarly, the aromatic carbon ratio increased from 0.28 to 0.52, and the cycloalkane carbon decreased from 0.29 to 0.08 with an increase in polarity.
关键词 ：
Asphalt binder Asphalt binder Asphaltenes Asphaltenes Average molecular structure model Average molecular structure model Chromatography Chromatography SARA fractions SARA fractions
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| GB/T 7714 | Guo, Meng , Liang, Meichen , Fu, Ye et al. Average molecular structure models of unaged asphalt binder fractions [J]. | MATERIALS AND STRUCTURES , 2021 , 54 (4) . |
| MLA | Guo, Meng et al. "Average molecular structure models of unaged asphalt binder fractions" . | MATERIALS AND STRUCTURES 54 . 4 (2021) . |
| APA | Guo, Meng , Liang, Meichen , Fu, Ye , Sreeram, Anand , Bhasin, Amit . Average molecular structure models of unaged asphalt binder fractions . | MATERIALS AND STRUCTURES , 2021 , 54 (4) . |
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摘要 ：
Aggregate size is usually measured by manual sampling and sieving. Machine vision techniques can provide fast, non-invasive measurement. However, the traditional imaging method using a single size descriptor to discriminate different sieve-size classes of coarse aggregates might not yield high-precision classification results. To determine the optimum supervised machine learning model for coarse aggregates sieve-size measurement, 17 methods were evaluated and compared. To train our model, a new dataset named MFCA27 (Multiple Features of Coarse Aggregate 27) was introduced, which contains 27 features of aggregates based on aggregate threedimensional (3D) top-surface object. In addition, a feature selection approach for investigating how accuracy varied with the datasets under different feature sets was developed, where feature selection was performed according to the impurity-based feature importance score measured using an extremely randomized tree model. Experiments demonstrated that the Gaussian process classifier (GPC) was the best-performing method on the datasets with two- or three-dimensional (2D/3D) feature sets in terms of accuracy and robustness. The results also showed that, compared with the traditional aggregate sieve-size measurement method, which is based on a single size descriptor, GPC can achieve an accuracy of 95.06% on the test dataset of MFCA27 in the aggregate sieve-size class measurement task.
关键词 ：
Aggregates Aggregates Digital sieving Digital sieving Importance-based feature selection Importance-based feature selection Size distribution Size distribution Supervised machine learning Supervised machine learning
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| GB/T 7714 | Sun, Zhaoyun , Liu, Hanye , Ju, Huyan et al. Assessment of importance-based machine learning feature selection methods for aggregate size distribution measurement in a 3D binocular vision system [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 306 . |
| MLA | Sun, Zhaoyun et al. "Assessment of importance-based machine learning feature selection methods for aggregate size distribution measurement in a 3D binocular vision system" . | CONSTRUCTION AND BUILDING MATERIALS 306 (2021) . |
| APA | Sun, Zhaoyun , Liu, Hanye , Ju, Huyan , Li, Wei , Guo, Meng , Hao, Xueli et al. Assessment of importance-based machine learning feature selection methods for aggregate size distribution measurement in a 3D binocular vision system . | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 306 . |
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摘要 ：
The use of reclaimed asphalt pavement (RAP) is believed to contribute significantly towards overall energy conservation and environmental protection efforts. However, the recycling of aged binder from RAP requires a fundamental understanding of the interaction mechanism between such rejuvenators with recycled and unmodified binders. This study quantitatively investigated the impact of such agents in combination with the aging-rejuvenation process and other binder modifiers (SBS, crumb rubber, and a high viscosity modifier) on the fractional composition, rheology, and colloidal structural stability of asphalt binders. Based on these results, a rejuvenation index (RI) was proposed to quantitatively evaluate the rejuvenation of aged asphalt binder. Aging increased the proportion of resins and asphaltenes of asphalt binders which resulted in the decrease of its rheological properties. After the addition of the rejuvenators, the complex modulus of all aged binders were reduced. Certain rejuvenators transformed up to 5 percentage points of asphaltenes into other fractions. The aromatic oil-based rejuvenator showed the best rejuvenation of unmodified asphalt binder, but theRI was only 0.33. Overall, the results implied that rejuvenation of asphalt binders is a complex topic and further studies should be conducted to correlate the rheological behaviour with rejuvenation mechanisms beyond chemical fractions.
关键词 ：
aging-rejuvenation aging-rejuvenation chromatography chromatography Modified asphalt Modified asphalt rejuvenation index rejuvenation index rejuvenators rejuvenators
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| GB/T 7714 | Guo, Meng , Liang, Meichen , Sreeram, Anand et al. Characterisation of rejuvenation of various modified asphalt binders based on simplified chromatographic techniques [J]. | INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING , 2021 . |
| MLA | Guo, Meng et al. "Characterisation of rejuvenation of various modified asphalt binders based on simplified chromatographic techniques" . | INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING (2021) . |
| APA | Guo, Meng , Liang, Meichen , Sreeram, Anand , Bhasin, Amit , Luo, Daisong . Characterisation of rejuvenation of various modified asphalt binders based on simplified chromatographic techniques . | INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING , 2021 . |
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摘要 ：
High-elasticity modified asphalt is widely used in OGFC and bridge deck paving due to its high viscosity and strong displacement recovery capacity. It can improve the high-temperature deformation resistance and elastic recovery ability of the pavement. Especially in bridge deck pavement, high-elastic modified asphalt can inhibit the formation of reflective cracks and extend the service life. In order to quantitatively evaluate properties of the high-elasticity modified asphalt, rheological properties are studied by using a dynamic shear rheometer (DSR) test. The parameters were fitted with the Burgers model, and the constitutive equation was established. The 3 s elastic recovery rate Er was proposed to quantitatively evaluate the elastic recovery of high-elasticity modified asphalt. The experimental results show that the instantaneous modulus of elasticity G0 and the delayed modulus of elasticity G1 can be used to evaluate the elastic capacity. Er can quantitatively evaluate the elastic resilience of high-elasticity modified asphalt. The correlation coefficient between the test results of high-elasticity modified asphalt and those of impact toughness evaluation reached 0.9966, and the 3 s elastic recovery rate Er could be used to evaluate the elastic recovery ability of high-elasticity modified asphalt. © 2021 Jiani Wang et al.
关键词 ：
Asphalt Asphalt Bridge decks Bridge decks Elasticity Elasticity Elastic moduli Elastic moduli Pavements Pavements
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| GB/T 7714 | Wang, Jiani , Xue, Zhongjun , Guo, Meng et al. Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt [J]. | Advances in Materials Science and Engineering , 2021 , 2021 . |
| MLA | Wang, Jiani et al. "Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt" . | Advances in Materials Science and Engineering 2021 (2021) . |
| APA | Wang, Jiani , Xue, Zhongjun , Guo, Meng , Zhang, Shuaixiang . Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt . | Advances in Materials Science and Engineering , 2021 , 2021 . |
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摘要 ：
The influence of the chemical composition of asphalt, the aggregate lithology, and the morphological characteristics of the aggregate on the level of adhesion between the asphalt and the aggregate is investigated. A contactless three-dimensional (3D) white-light scanning technique is used to obtain point cloud data of the aggregate particles. Six independent feature parameters are used as evaluation indices to quantitatively describe the multilevel features of the 3D morphology of road aggregates. Methods for analyzing the feature parameters based on the point cloud data of the aggregate are presented. Subsequently, the process and evaluation standard of the adhesion test are improved to quantify the spalling degree of the asphalt film on the aggregate surface under boiling conditions. The influences of the chemical composition of the asphalt and the aggregate morphology on the level of adhesion between the asphalt and aggregate are analyzed, and the compatibility between aggregates with different lithologies and the asphalt is assessed. The results show that the shape factor (SF) can be used to characterize the needle-flake shape of the particles, the ellipsoid index (E) is suitable to determine the angularity of the aggregate particles, and the 3D joint roughness coefficient (JRC(3D)) describes the roughness of the particle surface. The type of adhesion between the aggregate and the asphalt includes chemical and physical adsorption; chemical bonding is relatively strong, and the physical orientation force and mechanical interlocking force are relatively weak. Alkaline limestone aggregates should be used with asphalt with a high aggregate content of colloid and asphaltenes. Basalt aggregate with weak alkalinity should be used with asphalt with a high colloid content, and the use of angular aggregates should be avoided. Acidic aggregates with compact shapes, few edges and corners, and rough surfaces should be used prudently.
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| GB/T 7714 | Li, Luoke , Guo, Meng , Zeng, Cong . Influence of the Chemical Composition of Asphalt and the 3D Morphology of the Aggregate on Contact Surface Adhesion [J]. | ADVANCES IN CIVIL ENGINEERING , 2021 , 2021 . |
| MLA | Li, Luoke et al. "Influence of the Chemical Composition of Asphalt and the 3D Morphology of the Aggregate on Contact Surface Adhesion" . | ADVANCES IN CIVIL ENGINEERING 2021 (2021) . |
| APA | Li, Luoke , Guo, Meng , Zeng, Cong . Influence of the Chemical Composition of Asphalt and the 3D Morphology of the Aggregate on Contact Surface Adhesion . | ADVANCES IN CIVIL ENGINEERING , 2021 , 2021 . |
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摘要 ：
The adhesion between asphalt binder and aggregate is very important to the performance and durability of asphalt pavement. In order to explore the characterisation of modified asphalt binder in microstructure during aging and rejuvenation, the virgin asphalt binder and three kinds of modified asphalt binder (styrene-butadiene-styrene block copolymer (SBS), rubber powder and high viscosity and high elasticity [HVHE] modifier) in different aging and rejuvenation condition were prepared. The micromorphology and surface adhesion were measured by atomic force microscopy. The average roughness value was used as the index to evaluate the micromorphology of asphalt binder. The surface adhesion was used as the index to evaluate the adhesion properties of asphalt binder. Results show that the "bee" structure of SBS-modified asphalt binder increased slightly after long-term aging, and the recovery effect of aromatics oil was the closest to that of the unaged one. The rubber powder-modified asphalt binder and HVHE-modified asphalt binder showed the spot structure. And no matter for short-term aging or long-term aging, aromatics oil had the best recovery effect on micro morphology. The adhesion of the three modified asphalts would decrease gradually after aging. The effects of three kinds of rejuvenator on the adhesion of SBS-modified asphalt binder and rubber powder-modified asphalt binder were different. Rejuvenator, aromatic oil and warm mix asphalt mixture (WMA) additive could rejuvenate the loss of adhesion of HVHE-modified asphalt binder to a certain extent.
关键词 ：
AFM AFM aging aging asphalt binder asphalt binder micromorphology micromorphology modifier modifier rejuvenation rejuvenation surface adhesion surface adhesion
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| GB/T 7714 | Guo, Meng , Liang, Meichen , Jiao, Yubo et al. Effect of aging and rejuvenation on adhesion properties of modified asphalt binder based on AFM [J]. | JOURNAL OF MICROSCOPY , 2021 . |
| MLA | Guo, Meng et al. "Effect of aging and rejuvenation on adhesion properties of modified asphalt binder based on AFM" . | JOURNAL OF MICROSCOPY (2021) . |
| APA | Guo, Meng , Liang, Meichen , Jiao, Yubo , Tan, Yiqiu , Yu, Jianxin , Luo, Daisong . Effect of aging and rejuvenation on adhesion properties of modified asphalt binder based on AFM . | JOURNAL OF MICROSCOPY , 2021 . |
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摘要 ：
The purpose of this study was to investigate the regeneration effect of waste cooking oil (WCO) on aged asphalt with molecular dynamics (MD) simulation, comparing it with a rejuvenator. Firstly, the molecular models of virgin and aged asphalt were established by blending the four components of asphalt (saturate, aromatic, resin, and asphaltenes). Then, different dosages of the rejuvenator and WCO (6, 9, and 12%) were included in the aged asphalt model for its regeneration. After that, MD simulations were utilized for researching the mechanical and cohesive properties of the recycled asphalt, including its density, viscosity, cohesive energy density (CED), shear modulus (G), bulk modulus (K), and elastic modulus (E). The results show that the density values of the asphalt models were relatively lower than the existing experimental results in the literature, which is mostly attributed to the fact that the heteroatoms of the asphalt molecules were not considered in the simulation. On the other hand, the WCO addition decreased the viscosity, the shear modulus (G), the bulk modulus (K), and the elastic modulus (E) of the aged asphalt, improving its CED. Moreover, the nature of the aged asphalt was gradually restored with increasing rejuvenator or WCO contents. Compared with the rejuvenator, the viscosity of the aged asphalt was more effectively restored through adding WCO, while the effect of the CED and the mechanical properties recovery of the aged asphalt was relatively low. This implies that WCO could restore partial mechanical properties of aging asphalt, which proves the possibility of using WCO as an asphalt rejuvenator. Additionally, the MD simulation played an important role in understanding the molecular interactions among the four components of asphalt and the rejuvenator, which will serve as a guideline to better design a WCO rejuvenator and optimize its content.
关键词 ：
cohesive properties cohesive properties mechanical properties mechanical properties molecular dynamics simulations molecular dynamics simulations rejuvenator rejuvenator waste cooking oil waste cooking oil
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| GB/T 7714 | Li, Lin , Xin, Cheng , Guan, Mingyang et al. Using Molecular Dynamics Simulation to Analyze the Feasibility of Using Waste Cooking Oil as an Alternative Rejuvenator for Aged Asphalt [J]. | SUSTAINABILITY , 2021 , 13 (8) . |
| MLA | Li, Lin et al. "Using Molecular Dynamics Simulation to Analyze the Feasibility of Using Waste Cooking Oil as an Alternative Rejuvenator for Aged Asphalt" . | SUSTAINABILITY 13 . 8 (2021) . |
| APA | Li, Lin , Xin, Cheng , Guan, Mingyang , Guo, Meng . Using Molecular Dynamics Simulation to Analyze the Feasibility of Using Waste Cooking Oil as an Alternative Rejuvenator for Aged Asphalt . | SUSTAINABILITY , 2021 , 13 (8) . |
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摘要 ：
In order to study the reversibility between aging and rejuvenation of modified asphalt binder, a kind of virgin asphalt was selected, and then three kinds of modified asphalt were prepared based on this virgin asphalt. The short-term and long-term aging tests were carried out for the four asphalts. Then three kinds of rejuvenation tests were carried out for the aged asphalt, including commercial rejuvenator, aromatic oil and warm mix rejuvenator. Dynamic shear rheometer (DSR) was used to carry out frequency scanning tests at different temperatures. According to the principle of time temperature equivalence, the master curves of different modified asphalts were constructed, and the rheological properties of asphalt during aging and rejuvenation were studied. By comparing the parameters including complex modulus and hardening index, the rejuvenation effects of viscoelastic properties of modified asphalt were evaluated. Based on the complex modulus of virgin asphalt and modified asphalt, the aging rejuvenation reversible index RM of modified asphalt is proposed to evaluate the recovery of rheological properties of asphalt by different rejuvenators. The results show that the modulus of three kinds of modified asphalt will increase with the deepening of aging. Warm mix rejuvenator can reduce the complex modulus of virgin asphalt, SBS modified asphalt and rubber powder modified asphalt most significantly, followed by the rejuvenator, and the aromatics oil reduced least obviously. This applied to both short-term aging and long-term aging. This research provides a better understanding on the effectiveness and limitation of current rejuvenation techniques and rejuvenators on common asphalts, which is good for the further improvement on production and techniques. (C) 2021 Elsevier Ltd. All rights reserved.
关键词 ：
Aging Aging Asphalt binder Asphalt binder Complex modulus Complex modulus Hardening index Hardening index Modifier Modifier Rejuvenation Rejuvenation Rheology Rheology
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| GB/T 7714 | Guo, Meng , Liu, Xu , Jiao, Yubo et al. Rheological characterization of reversibility between aging and rejuvenation of common modified asphalt binders [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 301 . |
| MLA | Guo, Meng et al. "Rheological characterization of reversibility between aging and rejuvenation of common modified asphalt binders" . | CONSTRUCTION AND BUILDING MATERIALS 301 (2021) . |
| APA | Guo, Meng , Liu, Xu , Jiao, Yubo , Tan, Yiqiu , Luo, Daisong . Rheological characterization of reversibility between aging and rejuvenation of common modified asphalt binders . | CONSTRUCTION AND BUILDING MATERIALS , 2021 , 301 . |
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