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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.
Fujin Hou; Tao Li; Xu Li; Yunliang Li; Meng Guo. Research on the Anti-Reflective Cracking Performance of a Full-Depth Asphalt Pavement. Sustainability 2021, 13, 9499 .
AMA StyleFujin Hou, Tao Li, Xu Li, Yunliang Li, Meng Guo. Research on the Anti-Reflective Cracking Performance of a Full-Depth Asphalt Pavement. Sustainability. 2021; 13 (17):9499.
Chicago/Turabian StyleFujin Hou; Tao Li; Xu Li; Yunliang Li; Meng Guo. 2021. "Research on the Anti-Reflective Cracking Performance of a Full-Depth Asphalt Pavement." Sustainability 13, no. 17: 9499.
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.
Meng Guo; Meichen Liang; Anand Sreeram; Amit Bhasin; Daisong Luo. Characterisation of rejuvenation of various modified asphalt binders based on simplified chromatographic techniques. International Journal of Pavement Engineering 2021, 1 -11.
AMA StyleMeng Guo, Meichen Liang, Anand Sreeram, Amit Bhasin, Daisong Luo. Characterisation of rejuvenation of various modified asphalt binders based on simplified chromatographic techniques. International Journal of Pavement Engineering. 2021; ():1-11.
Chicago/Turabian StyleMeng Guo; Meichen Liang; Anand Sreeram; Amit Bhasin; Daisong Luo. 2021. "Characterisation of rejuvenation of various modified asphalt binders based on simplified chromatographic techniques." International Journal of Pavement Engineering , no. : 1-11.
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.
Lin Li; Cheng Xin; Mingyang Guan; Meng Guo. Using Molecular Dynamics Simulation to Analyze the Feasibility of Using Waste Cooking Oil as an Alternative Rejuvenator for Aged Asphalt. Sustainability 2021, 13, 4373 .
AMA StyleLin Li, Cheng Xin, Mingyang Guan, Meng Guo. Using Molecular Dynamics Simulation to Analyze the Feasibility of Using Waste Cooking Oil as an Alternative Rejuvenator for Aged Asphalt. Sustainability. 2021; 13 (8):4373.
Chicago/Turabian StyleLin Li; Cheng Xin; Mingyang Guan; Meng Guo. 2021. "Using Molecular Dynamics Simulation to Analyze the Feasibility of Using Waste Cooking Oil as an Alternative Rejuvenator for Aged Asphalt." Sustainability 13, no. 8: 4373.
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 E r was proposed to quantitatively evaluate the elastic recovery of high-elasticity modified asphalt. The experimental results show that the instantaneous modulus of elasticity G 0 and the delayed modulus of elasticity G 1 can be used to evaluate the elastic capacity. E r 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 E r could be used to evaluate the elastic recovery ability of high-elasticity modified asphalt.
Jiani Wang; Zhongjun Xue; Meng Guo; Shuaixiang Zhang. Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt. Advances in Materials Science and Engineering 2021, 2021, 1 -8.
AMA StyleJiani Wang, Zhongjun Xue, Meng Guo, Shuaixiang Zhang. Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt. Advances in Materials Science and Engineering. 2021; 2021 ():1-8.
Chicago/Turabian StyleJiani Wang; Zhongjun Xue; Meng Guo; Shuaixiang Zhang. 2021. "Using the Rheological Index to Quantitatively Evaluate the Mechanical Performance of High-Elasticity Modified Asphalt." Advances in Materials Science and Engineering 2021, no. : 1-8.
In this work, to quantitatively analyze the roughness of the surfaces of road aggregates, the contact measurement technique and contactless scanning technique were, respectively, used to capture the coordinate data of point clouds on the aggregate surface, which were then used to reconstruct the digital elevation models of aggregate particles. Then, the joint roughness coefficient (JRC) was used as an evaluation index, and the quantitative calculation methods of the two-dimensional (2D) contour line roughness and three-dimensional (3D) contour surface roughness of aggregate particles were, respectively, studied. Finally, the anisotropic characteristics and size effect of the roughness coefficients of aggregates with different lithologies were, respectively, investigated, based on which the practicability of the 3D roughness coefficient index was proven. The results demonstrate that the roughness of a road aggregate surface can be quantitatively described by the point cloud data. The 2D roughness of aggregate profile lines exhibits anisotropy, while the 3D roughness of the aggregate contour surface indicates the size effect. The subtle morphological changes of the surface textures of aggregates can be accurately described by the 3D joint roughness coefficient (JRC3D) calculated by the feature parameter method.
Luoke Li; Meng Guo; Cong Zeng. Study on the Accurate Measurement and Quantitative Evaluation Methods of Aggregate Surface Roughness. Advances in Materials Science and Engineering 2021, 2021, 1 -12.
AMA StyleLuoke Li, Meng Guo, Cong Zeng. Study on the Accurate Measurement and Quantitative Evaluation Methods of Aggregate Surface Roughness. Advances in Materials Science and Engineering. 2021; 2021 ():1-12.
Chicago/Turabian StyleLuoke Li; Meng Guo; Cong Zeng. 2021. "Study on the Accurate Measurement and Quantitative Evaluation Methods of Aggregate Surface Roughness." Advances in Materials Science and Engineering 2021, no. : 1-12.
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 (JRC3D) 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.
Luoke Li; Meng Guo; Cong Zeng. Influence of the Chemical Composition of Asphalt and the 3D Morphology of the Aggregate on Contact Surface Adhesion. Advances in Civil Engineering 2021, 2021, 1 -16.
AMA StyleLuoke Li, Meng Guo, Cong Zeng. Influence of the Chemical Composition of Asphalt and the 3D Morphology of the Aggregate on Contact Surface Adhesion. Advances in Civil Engineering. 2021; 2021 ():1-16.
Chicago/Turabian StyleLuoke Li; Meng Guo; Cong Zeng. 2021. "Influence of the Chemical Composition of Asphalt and the 3D Morphology of the Aggregate on Contact Surface Adhesion." Advances in Civil Engineering 2021, no. : 1-16.
Recycling of waste glass is an efficient way to protect the environment and save resources. This study evaluated the effective utilizations of glass sand (GS) to replace the quartz sand (QS) in typical ultra-high performance concrete (UHPC) and river sand (RS) in ultra-high performance river sand concrete (UHPRC). Ultra-high performance glass concretes (UHPGC) with different substitution ratios were prepared. The working performances and mechanical properties were evaluated, respectively. Meanwhile, the fracture characteristics of typical UHPC, UHPRC and UHPGC were characterized by acoustic emission (AE) parameters. Results show that the fluidities of typical UHPC and UHPRC are significantly enhanced by the addition of GS. The replacements of QS and RS by GS improve the compressive strengths of UHPC and UHPRC. When the replacement ratio of GS is 75%, the compressive strengths of typical UHPC and UHPRC both reach the maximum. The addition of GS presents no significant effects on flexural and splitting tensile strengths. Moreover, the fracture processes of UHPC, UHPRC and UHPGC under different loading conditions can be favorably characterized by AE amplitude and energy. The scanning electron microscope (SEM) tests of concrete mixes reveal the change trends of mechanical and fracture properties from the microcosmic point of view. The cleaner production of UHPGC realized the recycling of waste glass from landfill, which presents great potential for the future sustainable development of UHPC in bridge structures.
Yubo Jiao; Yao Zhang; Meng Guo; Lidong Zhang; Hao Ning; Shiqi Liu. Mechanical and fracture properties of ultra-high performance concrete (UHPC) containing waste glass sand as partial replacement material. Journal of Cleaner Production 2020, 277, 123501 .
AMA StyleYubo Jiao, Yao Zhang, Meng Guo, Lidong Zhang, Hao Ning, Shiqi Liu. Mechanical and fracture properties of ultra-high performance concrete (UHPC) containing waste glass sand as partial replacement material. Journal of Cleaner Production. 2020; 277 ():123501.
Chicago/Turabian StyleYubo Jiao; Yao Zhang; Meng Guo; Lidong Zhang; Hao Ning; Shiqi Liu. 2020. "Mechanical and fracture properties of ultra-high performance concrete (UHPC) containing waste glass sand as partial replacement material." Journal of Cleaner Production 277, no. : 123501.
Phase change materials (PCMs) can adjust the external temperature by changing their phase states. In order to understand the application of PCMs in asphalt pavements, this paper mainly studied the classification, mechanism, thermoregulation effects of PCMs and the preparation method of composite phase change materials (CPCMs). In addition, the effects of directly incorporated PCMs and composite ones on the properties of asphalt binder and asphalt mixture were described. Results show that directly incorporated PCMs play a role in thermoregulation. However, there is high temperature leakage phenomenon, which has a significant adverse effect on the road performance of asphalt binder and asphalt mixture. CPCMs effectively prevented leakage, reduced the adverse impact on the physical properties of asphalt binder. It is an ideal way to add CPCMs as an alternative component to asphalt mixture. CPCMs improved the heat storage and release capacity of asphalt mixture and the road performance of asphalt mixture, such as high-temperature stability, low-temperature anti-cracking had been improved.
Meng Guo; Meichen Liang; Yubo Jiao; Wei Zhao; Yongxia Duan; Haiqing Liu. A review of phase change materials in asphalt binder and asphalt mixture. Construction and Building Materials 2020, 258, 119565 .
AMA StyleMeng Guo, Meichen Liang, Yubo Jiao, Wei Zhao, Yongxia Duan, Haiqing Liu. A review of phase change materials in asphalt binder and asphalt mixture. Construction and Building Materials. 2020; 258 ():119565.
Chicago/Turabian StyleMeng Guo; Meichen Liang; Yubo Jiao; Wei Zhao; Yongxia Duan; Haiqing Liu. 2020. "A review of phase change materials in asphalt binder and asphalt mixture." Construction and Building Materials 258, no. : 119565.
This study aims to adopt the acoustic emission (AE) technique to evaluate the reinforcing effect of basalt and steel fibers on the fracture resistance of asphalt concrete (AC) under indirect tension (IDT) testing at low temperature. Control asphalt concrete (CAC) with no fibers was also tested for comparison. The AE counts and durations were recorded and analyzed to characterize the fracture processes of basalt fiber reinforced asphalt concretes (BFRAC) and steel fiber reinforced asphalt concretes (SFRAC), which were compared with the results from static displacement and strain data obtained through digital image correlation (DIC). The results revealed that the low-temperature fracture processes of BFRAC and SFRAC could be effectively divided into four stages according to the evolutions of AE parameters and corresponding cumulative AE parameters. AE properties could effectively evaluate the reinforcing effects of basalt and steel fibers on the low-temperature fracture resistance of AC, whereas static displacement and strain failed to identify the effects. BFRAC with a fiber length of 12 mm (BFRAC-12) had favorable ductile property at the final failure stage, whereas BFRAC with a fiber length of 6 mm (BFRAC-6), SFRAC with a fiber length of 6 mm (SFRAC-6), and SFRAC with a fiber length of 12 mm (SFRAC-12) exhibited brittle characteristics based on variations of AE parameters. Good correlations between the curve characteristics of AE parameters and the failure loads of AC specimens can be observed. The AE technique demonstrated great potential for the damage fracture characterization of asphalt materials.
Yubo Jiao; Lidong Zhang; Qinglin Guo; Meng Guo; Yao Zhang. Acoustic Emission-Based Reinforcement Evaluation of Basalt and Steel Fibers on Low-Temperature Fracture Resistance of Asphalt Concrete. Journal of Materials in Civil Engineering 2020, 32, 04020104 .
AMA StyleYubo Jiao, Lidong Zhang, Qinglin Guo, Meng Guo, Yao Zhang. Acoustic Emission-Based Reinforcement Evaluation of Basalt and Steel Fibers on Low-Temperature Fracture Resistance of Asphalt Concrete. Journal of Materials in Civil Engineering. 2020; 32 (5):04020104.
Chicago/Turabian StyleYubo Jiao; Lidong Zhang; Qinglin Guo; Meng Guo; Yao Zhang. 2020. "Acoustic Emission-Based Reinforcement Evaluation of Basalt and Steel Fibers on Low-Temperature Fracture Resistance of Asphalt Concrete." Journal of Materials in Civil Engineering 32, no. 5: 04020104.
In the process of using Buton rock asphalt- (BRA-) modified asphalt, in order to improve the utilization rate of Buton rock asphalt and the performance of the modified asphalt, this paper puts forward the process of “activation” treatment of Buton rock asphalt, that is, grinding and heating of BRA to make natural asphalt precipitate. Laboratory tests show that compared with modified asphalt without activation process, the penetration of the modified asphalt decreases, the softening point rises, the ductility at 5°C and the kinematic viscosity at 135°C all have been increased, and the performance of the modified asphalt increases with the increase of the content of activated BRA. In order to further clarify the effect of “activation” process on the properties of BRA-modified asphalt from microlevel, atomic force microscopy (AFM) was used to test the microproperties of Buton rock asphalt before and after activation. It is found that the Derjaguin–Muller–Toporov (DMT) modulus of the modified asphalt is about 2.5 times that of base asphalt, which indicates that the viscous degree of modified asphalt with activated BRA has been greatly increased and the modification effect is remarkable.
Yafei Li; Meng Guo; Xu Liu. Macroscopic and Microscopic Characterization of the Effect of “Activation” Process on the Performance of Buton Rock Asphalt-Modified Asphalt. Advances in Materials Science and Engineering 2020, 2020, 1 -6.
AMA StyleYafei Li, Meng Guo, Xu Liu. Macroscopic and Microscopic Characterization of the Effect of “Activation” Process on the Performance of Buton Rock Asphalt-Modified Asphalt. Advances in Materials Science and Engineering. 2020; 2020 ():1-6.
Chicago/Turabian StyleYafei Li; Meng Guo; Xu Liu. 2020. "Macroscopic and Microscopic Characterization of the Effect of “Activation” Process on the Performance of Buton Rock Asphalt-Modified Asphalt." Advances in Materials Science and Engineering 2020, no. : 1-6.
With the implementation of the Xiongan New Area and the urbanization construction plan surrounding the Beijing-Tianjin satellite, it is urgent to study and apply the sponge-permeable paving materials to solve the “urban waterlogging and heat island effect.” In this paper, the hydration microscopic characteristics of cementitious materials are analyzed by means of the differential scanning calorimetry (DSC) test. The test of water-cement ratio, porosity, and gradation structure on the strength and permeability coefficient is emphasized, and the strength change rule of porous permeable concrete is obtained. The research results are shown as follows: (1) The DSC test shows that the effect of temperature on the hydration process of cement is obvious. With the increase of temperature, the two exothermic peaks of cement hydration increase significantly and tend to overlap and the exothermic process is shortened. At 85°C, only one exothermic peak appeared, indicating that C3S hydration and ettringite formation process were completed at the same time in a relatively short time. (2) The optimal water-binder ratio of pervious concrete ranges from 0.24 to 0.30, and the optimal porosity ranges should be controlled within the range of 15%–25%. Moreover, the open gradation of pervious concrete mix ratio design is selected, and the cement content should be within the range of 20%–25%. (3) The mathematical model of permeability coefficient and porosity ratio of permeable concrete is established: k=−0.0003n2+0.0057n−0.0044; the mathematical model of permeability coefficient and compressive strength of open-graded pervious concrete: k=0.99006−0.05389c+8.02×10−4c2. The research results can provide theoretical support and technical guidance for the design and construction of permeable materials of sponge cities in Xiongan New Area and surrounding ring new area, which are of great engineering value.
Sanqiang Yang; Meng Guo; Shichao Duan; Na Liu; Haonan Wu; Erxia Du; Meichen Liang. Study on Strength Variation of Permeable Concrete Based on Differential Calorimetry Method and Multi-Index Test. Advances in Materials Science and Engineering 2019, 2019, 1 -9.
AMA StyleSanqiang Yang, Meng Guo, Shichao Duan, Na Liu, Haonan Wu, Erxia Du, Meichen Liang. Study on Strength Variation of Permeable Concrete Based on Differential Calorimetry Method and Multi-Index Test. Advances in Materials Science and Engineering. 2019; 2019 ():1-9.
Chicago/Turabian StyleSanqiang Yang; Meng Guo; Shichao Duan; Na Liu; Haonan Wu; Erxia Du; Meichen Liang. 2019. "Study on Strength Variation of Permeable Concrete Based on Differential Calorimetry Method and Multi-Index Test." Advances in Materials Science and Engineering 2019, no. : 1-9.
Accurate evaluation and analysis of expressway pavement performance is a prerequisite for determining the pavement design scheme and maintenance scheme. Due to the fuzziness and randomness of many factors affecting the pavement performance, this paper relies on the reconstruction and expansion project of Xinglin section of the Taihang mountain expressway, a method of highway pavement performance evaluation based on fuzzy mathematics is proposed. The results show the following: ① the study uses the factor domain, the comment level domain, the fuzzy relationship matrix, the evaluation factor full vector, and the fuzzy comprehensive evaluation result vector five-step method. The method can be effectively combined with the multi-index comprehensive detection index used in the specification. ② Based on the multi-index comprehensive test and evaluation adopted in the specification, the performance grade of the old road surface was quantitatively evaluated by the iterative calculation of fuzzy mathematics that broke through the evaluation mode which was based on the traditional detection methods. The research results provide innovative theoretical methods for the accurate evaluation and analysis of highway pavement performance in the semiarid climate region and also play a technical supporting role for the pavement design scheme and maintenance scheme decision-making in the semiarid climate region.
Sanqiang Yang; Meng Guo; Xinlei Liu; Pidong Wang; Qian Li; Haiqing Liu. Highway Performance Evaluation Index in Semiarid Climate Region Based on Fuzzy Mathematics. Advances in Materials Science and Engineering 2019, 2019, 1 -7.
AMA StyleSanqiang Yang, Meng Guo, Xinlei Liu, Pidong Wang, Qian Li, Haiqing Liu. Highway Performance Evaluation Index in Semiarid Climate Region Based on Fuzzy Mathematics. Advances in Materials Science and Engineering. 2019; 2019 ():1-7.
Chicago/Turabian StyleSanqiang Yang; Meng Guo; Xinlei Liu; Pidong Wang; Qian Li; Haiqing Liu. 2019. "Highway Performance Evaluation Index in Semiarid Climate Region Based on Fuzzy Mathematics." Advances in Materials Science and Engineering 2019, no. : 1-7.
Meng Guo; Yiqiu Tan. Interaction between asphalt and mineral fillers and its correlation to mastics’ viscoelasticity. International Journal of Pavement Engineering 2019, 22, 1 -10.
AMA StyleMeng Guo, Yiqiu Tan. Interaction between asphalt and mineral fillers and its correlation to mastics’ viscoelasticity. International Journal of Pavement Engineering. 2019; 22 (1):1-10.
Chicago/Turabian StyleMeng Guo; Yiqiu Tan. 2019. "Interaction between asphalt and mineral fillers and its correlation to mastics’ viscoelasticity." International Journal of Pavement Engineering 22, no. 1: 1-10.
This paper investigated the rheological properties of asphalt binder, asphalt mastic and asphalt mortar and the interaction between asphalt binder, mineral filler and fine aggregates. Asphalt binder, mastic and mortar can be regarded as the binding phase at different scales in asphalt concrete. Asphalt mastic is a blend of asphalt binder and mineral filler smaller than 0.075 mm while asphalt mortar consists of asphalt binder, mineral filler and fine aggregate smaller than 2.36 mm. The material compositions of mastic and mortar were determined from the commonly used asphalt mixtures. Dynamic shear rheometer was used to conduct rheological analysis on asphalt binder, mastic and mortar. The obtained test data on complex modulus and phase angle were used for the construction of rheological master curves and the investigation of asphalt-filler/aggregate interaction. Test results indicated a modulus increase of three- to five-fold with the addition of filler and a further increase of one to two orders of magnitude with cumulative addition of fine aggregates into asphalt binder. Fine aggregates resulted in a phase change for mortar at high temperatures and low frequencies. The filler had stronger physical interaction than fine aggregate with an interaction parameter of 1.8–2.8 and 1.15–1.35 respectively. Specific area could enhance asphalt-filler interaction. The mastic and mortar modulus can be well predicted based on asphalt binder modulus by using particle filling effect. Asphalt mortar had a significant modulus reinforcement and phase change and thus could be the closest subscale in terms of performance to that of asphalt mixtures. It could be a vital scale that bridges the gap between asphalt binder and asphalt mixtures in multiscale performance analysis.
Meng Chen; Barugahare Javilla; Wei Hong; ChangLuan Pan; Martin Riara; Liantong Mo; Meng Guo. Rheological and Interaction Analysis of Asphalt Binder, Mastic and Mortar. Materials 2019, 12, 128 .
AMA StyleMeng Chen, Barugahare Javilla, Wei Hong, ChangLuan Pan, Martin Riara, Liantong Mo, Meng Guo. Rheological and Interaction Analysis of Asphalt Binder, Mastic and Mortar. Materials. 2019; 12 (1):128.
Chicago/Turabian StyleMeng Chen; Barugahare Javilla; Wei Hong; ChangLuan Pan; Martin Riara; Liantong Mo; Meng Guo. 2019. "Rheological and Interaction Analysis of Asphalt Binder, Mastic and Mortar." Materials 12, no. 1: 128.
Individual effect of aging and rejuvenator recycling on basic properties of asphalt is readily recognized, but there is only limited understanding about whether the recycling of SBS- (styrene-butadiene-styrene-) modified asphalt is an inverse process of aging or not. To compare the effects of aging and rejuvenator on microproperties and molecular composition of SBS-modified asphalt, comprehensive performance tests and physical-chemistry experiments were conducted. The results of infrared spectroscopy tests demonstrate that the reticular crosslinking structure of asphalt was destroyed and SBS’s modification effect was gradually lost after aging. This can cause the strengthening of high-temperature performance and reduction of the low-temperature anticrack property of SBS-modified asphalt. Scanning electron microscope shows that the island structure of SBS-modified asphalt disappeared after aging. Energy spectrum analysis shows that the C (carbon) content of aged SBS-modified asphalt has decreased, while the O (oxygen) content and S (sulfur) content have increased obviously. Results of the fluorescence microscope, SEM, and rheological tests show that the epoxy functional group compounds of aliphatic glycidyl ether resin had high reactivity; the triblock molecular structure of SBS and the mechanical performance of SBS-modified asphalt were recovered.
Meng Guo; Yiqiu Tan; Daisong Luo; Yafei Li; Asim Farooq; Liantong Mo; Yubo Jiao. Effect of Recycling Agents on Rheological and Micromechanical Properties of SBS-Modified Asphalt Binders. Advances in Materials Science and Engineering 2018, 2018, 1 -12.
AMA StyleMeng Guo, Yiqiu Tan, Daisong Luo, Yafei Li, Asim Farooq, Liantong Mo, Yubo Jiao. Effect of Recycling Agents on Rheological and Micromechanical Properties of SBS-Modified Asphalt Binders. Advances in Materials Science and Engineering. 2018; 2018 ():1-12.
Chicago/Turabian StyleMeng Guo; Yiqiu Tan; Daisong Luo; Yafei Li; Asim Farooq; Liantong Mo; Yubo Jiao. 2018. "Effect of Recycling Agents on Rheological and Micromechanical Properties of SBS-Modified Asphalt Binders." Advances in Materials Science and Engineering 2018, no. : 1-12.
Urban population growth and urbanization with its impact on urban planning require continuous research in order to address the challenges posed by transportation requirements. Identifying transportation capacity (road and railways) is an important task that can identify whether the network is capable of sustaining the present volume of traffic and whether it can handle the future intended traffic flow. A new city, XiongAn, will be built in the coming years in order to relieve the pressure of population on Beijing and disperse the economic growth, business activity, and opportunities across the country. The focus of this research is to generate a transportation model between Beijing and XiongAn, in order to increase connection and connectivity, reduce travel time, and increase transfer capacity between the two hubs (Beijing-XiongAn). The existing transportation network between two cities is analyzed and a network which can handle future demand has been proposed. The first stage has been the investigation of a variety of options using geographic information system (GIS). Planning and implementing a mass transit system requires choosing among options such as an existing intercity railway line, a new high-speed railway line, and/or motorway options. In the second phase of our analysis, we assess these options relative to multiple criteria, using the analytic hierarchy process (AHP). The options were evaluated using various criteria responsible for selection of alternative; it is found that travel time, cost of travel, safety, reliability, accessibility, and environment are key criteria for selecting the best alternative. The GIS and multicriteria analysis suggested that the best option is to build a new high speed railway line.
Asim Farooq; Mowen Xie; Svetla Stoilova; Firoz Ahmad; Meng Guo; Edward J. Williams; V K Gahlot; Du Yan; Ahmat Mahamat Issa. Transportation Planning through GIS and Multicriteria Analysis: Case Study of Beijing and XiongAn. Journal of Advanced Transportation 2018, 2018, 1 -16.
AMA StyleAsim Farooq, Mowen Xie, Svetla Stoilova, Firoz Ahmad, Meng Guo, Edward J. Williams, V K Gahlot, Du Yan, Ahmat Mahamat Issa. Transportation Planning through GIS and Multicriteria Analysis: Case Study of Beijing and XiongAn. Journal of Advanced Transportation. 2018; 2018 ():1-16.
Chicago/Turabian StyleAsim Farooq; Mowen Xie; Svetla Stoilova; Firoz Ahmad; Meng Guo; Edward J. Williams; V K Gahlot; Du Yan; Ahmat Mahamat Issa. 2018. "Transportation Planning through GIS and Multicriteria Analysis: Case Study of Beijing and XiongAn." Journal of Advanced Transportation 2018, no. : 1-16.
In order to study the effects of aging on rheological and molecular properties of styrene-butadiene-styrene (SBS) modified asphalt, rheological and gel permeation chromatography (GPC) experiments were conducted on unaged and aged asphalt binders. The results show that the penetration of SBS modified asphalt droped with aging. The softening point of SBS modified as-phalt rises with the aging progress. The molecular oxidative condensation effect exceeds the down regulation effect of SBS degradation, leading to an increasing viscosity. After aging, ductility at 5 °C sharply attenuates and asphalt shows brittleness and no longer meets the requirements for high-grade highway pavement. SBS decomposition can inhibit the aging effect of asphalt molecules. This can restrain strengthening of high-temperature performance and reduction of low temperature anti-crack property of SBS modified asphalt.
Daisong Luo; Meng Guo; Yiqiu Tan; Yafei Li. Study on Effects of Aging on SBS Modified Asphalt Based on GPC and Rheological Methods. High Performance Fiber Reinforced Cement Composites 6 2018, 254 -259.
AMA StyleDaisong Luo, Meng Guo, Yiqiu Tan, Yafei Li. Study on Effects of Aging on SBS Modified Asphalt Based on GPC and Rheological Methods. High Performance Fiber Reinforced Cement Composites 6. 2018; ():254-259.
Chicago/Turabian StyleDaisong Luo; Meng Guo; Yiqiu Tan; Yafei Li. 2018. "Study on Effects of Aging on SBS Modified Asphalt Based on GPC and Rheological Methods." High Performance Fiber Reinforced Cement Composites 6 , no. : 254-259.
Jie Wang; Meng Guo; Yiqiu Tan. Study on application of cement substituting mineral fillers in asphalt mixture. International Journal of Transportation Science and Technology 2018, 7, 189 -198.
AMA StyleJie Wang, Meng Guo, Yiqiu Tan. Study on application of cement substituting mineral fillers in asphalt mixture. International Journal of Transportation Science and Technology. 2018; 7 (3):189-198.
Chicago/Turabian StyleJie Wang; Meng Guo; Yiqiu Tan. 2018. "Study on application of cement substituting mineral fillers in asphalt mixture." International Journal of Transportation Science and Technology 7, no. 3: 189-198.
This study investigated the effect of seven healing agents on crack healing ability of long-term aged asphalt and its mortar. Different healing agents including sunflower oil, aromatic oil, bitumen emulsion, and maltene-based emulsions were used. The crack healing of asphalt made use of two asphalt disk samples and healing was evaluated using direct tensile tests. For asphalt mortar, notched semi-circular samples were used. Test results indicated that the crack healing of asphalt and its mortar depended strongly on the type of healing agent. In general, asphalt healed faster than its mortar. Asphalt healing could be well improved by using oil agents, while asphalt mortar could be well healed with maltene-based emulsions. The crack healing of asphalt mortar developed rapidly followed by a steady state of increase. Initial crack healing using healing agents could be contributed by the diffusion and softening effects, which resulted in low strength recovery. Long term healing could lead to the bonding reconstitution in the cracks, which were decisive for the final strength gain. The promising healing agent should be able to achieve maximum strength recovery to resist cracking as well as a sufficient re-healing ability to deal with crack opening and closing.
ChangLuan Pan; Ping Tang; Martin Riara; Liantong Mo; Mingliang Li; Meng Guo. Effect of Healing Agents on Crack Healing of Asphalt and Asphalt Mortar. Materials 2018, 11, 1373 .
AMA StyleChangLuan Pan, Ping Tang, Martin Riara, Liantong Mo, Mingliang Li, Meng Guo. Effect of Healing Agents on Crack Healing of Asphalt and Asphalt Mortar. Materials. 2018; 11 (8):1373.
Chicago/Turabian StyleChangLuan Pan; Ping Tang; Martin Riara; Liantong Mo; Mingliang Li; Meng Guo. 2018. "Effect of Healing Agents on Crack Healing of Asphalt and Asphalt Mortar." Materials 11, no. 8: 1373.
Meng Guo; Yucheng Huang; Linbing Wang; Jianxin Yu; Yue Hou. Using atomic force microscopy and molecular dynamics simulation to investigate the asphalt micro properties. International Journal of Pavement Research and Technology 2018, 11, 321 -326.
AMA StyleMeng Guo, Yucheng Huang, Linbing Wang, Jianxin Yu, Yue Hou. Using atomic force microscopy and molecular dynamics simulation to investigate the asphalt micro properties. International Journal of Pavement Research and Technology. 2018; 11 (4):321-326.
Chicago/Turabian StyleMeng Guo; Yucheng Huang; Linbing Wang; Jianxin Yu; Yue Hou. 2018. "Using atomic force microscopy and molecular dynamics simulation to investigate the asphalt micro properties." International Journal of Pavement Research and Technology 11, no. 4: 321-326.