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Fine aggregate matrix (FAM) is considered as a key component affecting the performance of asphalt mixtures, but there is a lack of systematic research on the sample fabrication methods and the measurement of the air void. This study aims to investigate the internal pore structure of the FAM samples with different nominal maximum aggregate sizes (NMAS) fabricated by three different compaction methods, including Marshall compaction, Superpave gyratory compaction (SGC) and a popular direct compaction method. The three-dimensional microstructures of FAM specimens were reconstructed by the micro-computed tomography (mCT) scanning test. Air void quantity, volume, and spatial distribution of each FAM sample were obtained by analyzing the microstructure. Volumetric method and surface-dry method were also used to measure the air void content. The results show that the surface-dry method shows a better consistence with the mCT method. When comparing the void distribution of FAMs fabricated by different methods, it was found that the specimens prepared by the direct compaction method show different distributions of air voids with that cored from SGC samples, while the Marshall compaction method performed with more instability with respect to the total air voids. Spatial distribution indicated that FAMs fabricated by direct compaction method would have a concentration of void on the top or bottom due to the edge effects of the compacting process. The specimens cored from the SGC samples showed a better uniformity at large particle size. In general, the direct compaction method is recommended in the study of mortar with NMAS no more than 1.18 mm, while, it is better to fabricate FAM specimens cored from SGC samples when the NMAS is larger.
Zili Zhao; Jiwang Jiang; Fujian Ni; Xiang Ma. 3D-Reconstruction and characterization of the pore microstructure within the asphalt FAM using the X-ray micro-computed tomography. Construction and Building Materials 2020, 272, 121764 .
AMA StyleZili Zhao, Jiwang Jiang, Fujian Ni, Xiang Ma. 3D-Reconstruction and characterization of the pore microstructure within the asphalt FAM using the X-ray micro-computed tomography. Construction and Building Materials. 2020; 272 ():121764.
Chicago/Turabian StyleZili Zhao; Jiwang Jiang; Fujian Ni; Xiang Ma. 2020. "3D-Reconstruction and characterization of the pore microstructure within the asphalt FAM using the X-ray micro-computed tomography." Construction and Building Materials 272, no. : 121764.
As a new pavement surface treatment, thin friction course (TFC) is mixed with asphalt emulsion, SBR modifier, single particle size basalt aggregate, and cement. In this study, a test apparatus derived from the pure direct shear test was proposed to investigate the effects of design parameters and moisture conditions on the interface strength. Specifically, the design parameters include the tack coat application rates, the material compositions of TFC, and the texture depths of the underlying pavement. Finally, the analysis of variance (ANOVA) was conducted. According to the results, the increased application rate of tack coat and texture depth of underlying pavement could improve the interface bonding performance. The existence of moisture degraded the bond strength between TFC and the underlying pavement. The increased tack coat application rate could mitigate the detrimental effects of moisture conditions on the interface bond strength. In addition, the optimized material compositions of TFC can only strengthen the interface bond strength slightly. To sum up, the tack coat application rate shows the most significant effect on the interface bond strength, followed by the texture depths of the underlying pavement surface and moisture conditions. Furthermore, the interaction of texture depth and tack coat application rate also has a significant influence on interface bonding performance between TFC and the underlying pavement surface.
Yajin Han; Yanjing Zhao; Jiwang Jiang; Fujian Ni; Xuan Zhao. Effects of design parameters and moisture conditions on interface bond strength between thin friction course (TFC) and underlying asphalt pavements. Construction and Building Materials 2020, 269, 121347 .
AMA StyleYajin Han, Yanjing Zhao, Jiwang Jiang, Fujian Ni, Xuan Zhao. Effects of design parameters and moisture conditions on interface bond strength between thin friction course (TFC) and underlying asphalt pavements. Construction and Building Materials. 2020; 269 ():121347.
Chicago/Turabian StyleYajin Han; Yanjing Zhao; Jiwang Jiang; Fujian Ni; Xuan Zhao. 2020. "Effects of design parameters and moisture conditions on interface bond strength between thin friction course (TFC) and underlying asphalt pavements." Construction and Building Materials 269, no. : 121347.
In order to investigate the key factors and analyze their effects on maintenance and rehabilitation (M&R) strategies, data for 2495 pavement sections were collected from the pavement management system (PMS), including pavement performance data, traffic data, material property data, and M&R record data. Logistic regression was first employed to explore the influential factors on maintenance probability. Afterward, the classification tree model was established to find out the key factors on resurfacing thickness. Results showed that road sections with higher IRI, rutting depth (RD), deterioration rate of surface friction coefficient (DRSFC), pavement patching ratio (PPR), and transverse cracking severity index (TCSI) before treatment had significantly higher maintenance probability, which could be quantified by the developed logistic model. Moreover, treatments implemented on bridge decks tended to have greater resurfacing thickness. For pavement M&R projects, with the tensile strength ratio (TSR) of top layer materials higher than 88.7% and pretreatment SFC higher than 49, the resurfacing thickness would be thinner. For bridge M&R projects, middle layer TSR higher than 88.3% led to thinner overlays, and much thinner resurfacing thickness can be observed if pretreatment RD was less than 8.72 mm. When middle layer TSR was lower than 88.3% and pretreatment IRI was higher than 2.383 m/km with larger AESAL, the resurfacing thickness would probably be the thickest. The two models built in this paper provided probabilistic estimation of maintenance probability and explored key factors together with their critical split points for resurfacing thickness, which could be regarded as an alternative decision-making tool for pavement engineers.
Hongmei Li; Jiwang Jiang; Fujian Ni. Factors Affecting Maintenance Probability and Resurfacing Thickness Based on the Pavement Management System. Advances in Civil Engineering 2020, 2020, 1 -9.
AMA StyleHongmei Li, Jiwang Jiang, Fujian Ni. Factors Affecting Maintenance Probability and Resurfacing Thickness Based on the Pavement Management System. Advances in Civil Engineering. 2020; 2020 ():1-9.
Chicago/Turabian StyleHongmei Li; Jiwang Jiang; Fujian Ni. 2020. "Factors Affecting Maintenance Probability and Resurfacing Thickness Based on the Pavement Management System." Advances in Civil Engineering 2020, no. : 1-9.
Roadside bioretention and permeable pavements have proven effectiveness in rainwater filtration and waterlogging mitigation, but conventional street design approach could not accommodate their work in conjunction. In this research, possible roadside facilities allowing water transmission from permeable pavements and bioretention to the pipe system are proposed. Hydraulic properties of the comprised elements were analyzed, including rainfall intensity, permeable pavements, soil layers and pipe systems. A transformation method was formulated to obtain a successive time-intensity formula from conventional design parameters to describe the rainfall behavior, and therefore the water retention capacity of the bioretention could be considered. A test section of 1.6 km combining permeable pavements and roadside bioretention was constructed, and its hydraulic performance was predicted based on the proposed design method and Storm Water Management Model (SWMM). The research results suggest that the bioretention facilities and permeable pavements cooperate well in the test section. In a light rain event, the proposed street has favorable performance in rainwater collection and filtration. In a relatively intense rainstorm event, the street collects and filters water in the initial stage, but will have similar hydraulic performance to a conventional street once the retention facilities are saturated. Thus, no reduction in diameters of drainage pipes from conventional designs is suggested in similar projects.
Yiqing Dai; Jiwang Jiang; Xingyu Gu; Yanjing Zhao; Fujian Ni. Sustainable Urban Street Comprising Permeable Pavement and Bioretention Facilities: A Practice. Sustainability 2020, 12, 8288 .
AMA StyleYiqing Dai, Jiwang Jiang, Xingyu Gu, Yanjing Zhao, Fujian Ni. Sustainable Urban Street Comprising Permeable Pavement and Bioretention Facilities: A Practice. Sustainability. 2020; 12 (19):8288.
Chicago/Turabian StyleYiqing Dai; Jiwang Jiang; Xingyu Gu; Yanjing Zhao; Fujian Ni. 2020. "Sustainable Urban Street Comprising Permeable Pavement and Bioretention Facilities: A Practice." Sustainability 12, no. 19: 8288.
Thin friction course (TFC), one typical pavement surface treatments (PSTs), is mixed with modified asphalt emulsion, fine aggregate, and cement. Moisture-induced damage is one of the main distresses usually occurring in TFC. To mitigate potential moisture damage, varying TFCs with different combinations of emulsion, SBR latex, and cement dosages were investigated by the wet track abrasion test (WTAT). Then, the adhesive strength and cohesive stiffness of corresponding residue emulsion-cement mastics were estimated based on the binder bond strength (BBS) test and the strain sweep test, respectively. The results indicated that the increased emulsion, SBR latex, and cement dosages are beneficial to the moisture resistance of TFC. The pull-off strength of BBS test shows poor correlation with the aggregate losses and the failure type is cohesion by observation, which means the adhesion strength of the residue mastic-aggregate bond is higher than the cohesive strength based on the limited data. Furthermore, based on the strain sweep test, it was found that the cohesive parameters, including the maximum shear stress and the complex modulus at the strain level of 7% could perfectly correlate with the average aggregate loss with a correlation coefficient of 0.8841 and 0.8678, respectively. Therefore, both SBR and cement modification could enhance the cohesive stiffness of the cement-binder mastics and then improve the moisture resistance of the TFC.
Yajin Han; Jiwang Jiang; Fujian Ni; Qiao Dong; Xuan Zhao. Effect of cohesive and adhesive parameters on the moisture resistance of thin friction course (TFC) with varying mix design parameters. Construction and Building Materials 2020, 258, 119420 .
AMA StyleYajin Han, Jiwang Jiang, Fujian Ni, Qiao Dong, Xuan Zhao. Effect of cohesive and adhesive parameters on the moisture resistance of thin friction course (TFC) with varying mix design parameters. Construction and Building Materials. 2020; 258 ():119420.
Chicago/Turabian StyleYajin Han; Jiwang Jiang; Fujian Ni; Qiao Dong; Xuan Zhao. 2020. "Effect of cohesive and adhesive parameters on the moisture resistance of thin friction course (TFC) with varying mix design parameters." Construction and Building Materials 258, no. : 119420.
A modified wheel tracking test was produced to investigate the high-temperature failure of porous asphalt mixture under wheel loading. The sectional images of specimens, which were cured in different conditions, were acquired and analyzed by 2D image analysis after different loading times. Air voids with reference to size were divided into small void, medium void and large void. Air void indices in the sectional images, such as void number, total void area (TVA) as well as long and short axis ratio (L/S), were obtained. Based on the multi-factor analysis of variance method, the sensitivity of air void indices to curing conditions and loading times was evaluated, and a linear regression model was produced to investigate the relationship between air void indices and the average rutting depth. The results show that the air void indices including small void number (SVN), small void area (SVA), TVA and L/S were significantly affected by the loading time. The linear regression shows that the product of SVN, TVA and L/S could successfully evaluate the high-temperature failure of porous asphalt mixture during the wheel loading.
Xiang Ma; Peisheng Zhou; Jiwang Jiang; Xuquan Hu. High-temperature failure of porous asphalt mixture under wheel loading based on 2D air void structure analysis. Construction and Building Materials 2020, 252, 119051 .
AMA StyleXiang Ma, Peisheng Zhou, Jiwang Jiang, Xuquan Hu. High-temperature failure of porous asphalt mixture under wheel loading based on 2D air void structure analysis. Construction and Building Materials. 2020; 252 ():119051.
Chicago/Turabian StyleXiang Ma; Peisheng Zhou; Jiwang Jiang; Xuquan Hu. 2020. "High-temperature failure of porous asphalt mixture under wheel loading based on 2D air void structure analysis." Construction and Building Materials 252, no. : 119051.
Fracture simulation of asphalt mixtures based on three-dimensional finite element (3D-FE) simulation considering the mesostructure consumes too much computing resources and has low efficiency, which limits the popularisation and application of asphalt mixture fracture characteristics simulations. In contrast, two-dimensional finite element (2D-FE) simulation needs less computational resources and has high efficiency. However, 2D-FE simulation results significantly impacted by aggregate content and particle distribution in the scanned images and an arbitrary 2D image could hardly reflect the mesostructure of the whole asphalt mixture specimen. Therefore, two internal structure indicators, such as aggregate content indicator (ACI) and aggregate distribution indicator (ADI), were defined for image assessment, and an image selection process was proposed based on these two indicators for 2D-FE modelling method. By comparing the results obtained from 3D-FE simulations, 2D-FE simulations with or without image selection process, and laboratory tests, it can be found that the results of 2D-FE simulations with the image selection process are more consistent with laboratory test than other two simulation processes. Thus, it can be verified that the image selection process can highly enhance the accuracy of 2D-FE simulation while reducing the number of models needed and improving computational efficiency.
Yanjing Zhao; Jiwang Jiang; Lan Zhou; Fujian Ni. Improving the calculation accuracy of FEM for asphalt mixtures in simulation of SCB test considering the mesostructure characteristics. International Journal of Pavement Engineering 2020, 1 -15.
AMA StyleYanjing Zhao, Jiwang Jiang, Lan Zhou, Fujian Ni. Improving the calculation accuracy of FEM for asphalt mixtures in simulation of SCB test considering the mesostructure characteristics. International Journal of Pavement Engineering. 2020; ():1-15.
Chicago/Turabian StyleYanjing Zhao; Jiwang Jiang; Lan Zhou; Fujian Ni. 2020. "Improving the calculation accuracy of FEM for asphalt mixtures in simulation of SCB test considering the mesostructure characteristics." International Journal of Pavement Engineering , no. : 1-15.
Based on the long-term maintenance data, the performance and service lives of several orthotropic steel bridge deck (OSBD) pavement materials in long-span suspension bridges were studied and evaluated. According to the results, the pavement service life was found to have a strong relationship with traffic volume, so limiting overload of vehicles is an effective means to ensure the performance and prolong the pavement service life. Gussasphalt (GA) and ordinary road pavement asphalt mixtures cannot meet the requirement of OSBD pavement in suspension bridges, and cold-mixed resin-asphalt concretes are expensive and their application effects were not excellent enough. High-resilience polymer and rubber-modified asphalt concrete can be used as an alternative material in the maintenance of OSBD pavement because of their acceptable service life and proper cost. Epoxy asphalt concretes (EAC) were found to be the most successful materials in suspension bridge OSBD pavements. One kind of EAC, named Kindai Bridge Epoxy Pavement (KD-BEP), was confirmed to be more suitable for the maintenance of long-span suspension bridges’ OSBD pavement because of its simpler construction process, shorter curing period, and more stable quality.
Yanjing Zhao; Fujian Ni; Lan Zhou; Jiwang Jiang. Performance Evaluation of Long-Span Suspension Bridge Pavement Based on Long-Term Maintenance Data. Journal of Materials in Civil Engineering 2020, 32, 04019363 .
AMA StyleYanjing Zhao, Fujian Ni, Lan Zhou, Jiwang Jiang. Performance Evaluation of Long-Span Suspension Bridge Pavement Based on Long-Term Maintenance Data. Journal of Materials in Civil Engineering. 2020; 32 (2):04019363.
Chicago/Turabian StyleYanjing Zhao; Fujian Ni; Lan Zhou; Jiwang Jiang. 2020. "Performance Evaluation of Long-Span Suspension Bridge Pavement Based on Long-Term Maintenance Data." Journal of Materials in Civil Engineering 32, no. 2: 04019363.
Three points beam bending test has been used widely to investigate the cracking behavior of asphalt mixtures under low temperature, and fracture parameters can be obtained. In this paper, heterogeneous fracture modeling technology is presented to simulate crack evolution in asphalt mixture under beam bending test. Cutting surface images of three types of asphalt mixtures, such as ECA-10, SMA-13, and AC-13 are generated by c2-Dimensional (2D) scanning technology and digital image processing (DIP) method. Finally, 2D heterogeneous numerical models are created for asphalt mixture specimen, and numerical cohesive zone model is utilized to estimate the crack resistance of the interface based on laboratory fracture tests. The inception and propagation of main macro-cracks are carefully studied for three types of asphalt mixtures. Load-displacement curves are plotted, corresponding tensile strength and fracture strain energy density are calculated. The analyzing results of numerical simulation are proved to be quite consistent with actual experimental test, the reliability of numerical model is verified.
Yanjing Zhao; Ling Jiang; Lan Zhou; Jiwang Jiang. Heterogeneous Fracture Simulation of Asphalt Mixture under Beam Bending Test with Cohesive Zone Modeling. Transportation Research Congress 2017 2019, 1 .
AMA StyleYanjing Zhao, Ling Jiang, Lan Zhou, Jiwang Jiang. Heterogeneous Fracture Simulation of Asphalt Mixture under Beam Bending Test with Cohesive Zone Modeling. Transportation Research Congress 2017. 2019; ():1.
Chicago/Turabian StyleYanjing Zhao; Ling Jiang; Lan Zhou; Jiwang Jiang. 2019. "Heterogeneous Fracture Simulation of Asphalt Mixture under Beam Bending Test with Cohesive Zone Modeling." Transportation Research Congress 2017 , no. : 1.
Raveling, as one of the key distresses of the chip seal, affects the performance of the chip seal. A new cold-mixed ultra-thin (CMUT) chip seal consisting of modified emulsion, single particle size aggregate, and cement was designed. The wet track abrasion test (WTAT) was used to study the effects of curing conditions, submersion durations, amounts of aggregate, emulsion, and cement on both the early raveling and wet raveling resistance of the CMUT chip seal. In addition, the binder bond strength (BBS) test was also used to evaluate the moisture-induced damage with the prolonging of submersion durations. Additionally, the one-way analysis of variance was used to analyze the sensitivity of different factors. The results indicate that both temperature and curing time could significantly affect the raveling resistance of the CMUT chip seal. It is confirmed that submersion duration has significant influences on aggregate losses and pull-off strengths. With the prolonging of submersion duration, the moisture damage was severe but tending stable. Therefore, the raveling potential of specimens after being submerged for 6d was used to evaluate the wet raveling potential. According to the sensitivity analysis, it is confirmed that the emulsion dosage is the most significant factor affecting both the early and wet raveling resistance. Cement dosage is recognized to have dramatic effects on wet raveling resistance, while the effects are negligible when it comes to early raveling resistance. Furthermore, the amount of aggregate can hardly influence the raveling resistance of the CMUT chip seal.
Yajin Han; Jiwang Jiang; Fujian Ni; Qiao Dong. Factors affecting raveling resistance of cold-mixed ultra-thin chip seal. International Journal of Pavement Research and Technology 2019, 12, 553 -560.
AMA StyleYajin Han, Jiwang Jiang, Fujian Ni, Qiao Dong. Factors affecting raveling resistance of cold-mixed ultra-thin chip seal. International Journal of Pavement Research and Technology. 2019; 12 (5):553-560.
Chicago/Turabian StyleYajin Han; Jiwang Jiang; Fujian Ni; Qiao Dong. 2019. "Factors affecting raveling resistance of cold-mixed ultra-thin chip seal." International Journal of Pavement Research and Technology 12, no. 5: 553-560.
In order to investigate the fatigue cracking resistance of engineered cementitious composites (ECC) used in in total life pavement, the semi-circular bending (SCB) test and improved three-point bending fatigue test (ITBF) were utilized in this study. The digital image correlation (DIC) method was also utilized to track the surface strain fields of specimens during the SCB test. X-ray computed tomography (CT) and digital image processing (DIP) technologies were applied to measure the internal-crack distribution of the ITBF specimen. The results of the SCB test showed that the fatigue cracking damage process of ECC can be divided into three stages and that the cracking stable propagating stages occupied the main part, which indicates that ECC has excellent ductility and toughness and could work very well with existing cracks. The ITBF results showed that the fatigue cracking resistance of ECC was better than epoxy asphalt concrete (EAC). In addition, the internal-crack distribution along the depth direction of the ITBF specimen could be presented well by the image pixel statistical (IPS) method based on CT scanning of image slices. It could be found that multiple cracks propagate simultaneously in ECC, instead of a single crack, under the OSBD pavement working condition.
Yanjing Zhao; Jiwang Jiang; Fujian Ni; Lan Zhou. Fatigue Cracking Resistance of Engineered Cementitious Composites (ECC) under Working Condition of Orthotropic Steel Bridge Decks Pavement. Applied Sciences 2019, 9, 3577 .
AMA StyleYanjing Zhao, Jiwang Jiang, Fujian Ni, Lan Zhou. Fatigue Cracking Resistance of Engineered Cementitious Composites (ECC) under Working Condition of Orthotropic Steel Bridge Decks Pavement. Applied Sciences. 2019; 9 (17):3577.
Chicago/Turabian StyleYanjing Zhao; Jiwang Jiang; Fujian Ni; Lan Zhou. 2019. "Fatigue Cracking Resistance of Engineered Cementitious Composites (ECC) under Working Condition of Orthotropic Steel Bridge Decks Pavement." Applied Sciences 9, no. 17: 3577.
Zhou Zhou; Xingyu Gu; Jiwang Jiang; Fujian Ni; Yanxu Jiang. Fatigue cracking performance evaluation of laboratory-produced polymer modified asphalt mixture containing reclaimed asphalt pavement material. Construction and Building Materials 2019, 216, 379 -389.
AMA StyleZhou Zhou, Xingyu Gu, Jiwang Jiang, Fujian Ni, Yanxu Jiang. Fatigue cracking performance evaluation of laboratory-produced polymer modified asphalt mixture containing reclaimed asphalt pavement material. Construction and Building Materials. 2019; 216 ():379-389.
Chicago/Turabian StyleZhou Zhou; Xingyu Gu; Jiwang Jiang; Fujian Ni; Yanxu Jiang. 2019. "Fatigue cracking performance evaluation of laboratory-produced polymer modified asphalt mixture containing reclaimed asphalt pavement material." Construction and Building Materials 216, no. : 379-389.
Rutting is a common form of pavement distress, consisting of the deformation of each layer in the multilayer pavement structure. To explore the development of rutting, two types of multilayer specimens, S1 and S2, were prepared in this study. A wheel tracking test was conducted for these multilayer specimens, and the rutting depths at various cumulative times were recorded by the testing device. Images of the vertical sections of the multilayer specimens at these cumulative times were also obtained in this study. The fractal dimensions of the full-depth specimen, top layer (TL) and bottom layer (BL) were calculated based on fractal theory. The calculated fractal dimensions of the full-depth specimen presented high correlation with the rutting depths obtained from the wheel tracking test. Then the deformation of the full-depth specimen and each individual layer can be evaluated by their corresponding values of fractal dimension. The results showed that the full-depth specimen and its TL and BL generally exhibited two stages, densification and flow deformation, in the wheel tracking test. In particular, deformations of the TL and the BL displayed simultaneously at the beginning of test loading and the deformation of the TL made impact on the performance of the BL. Among the two stages of rutting development, the TL made of AC-13 in S1 presented obvious densification during the first 45 min of the test, but this was not observed in the corresponding BL. However, the TL made of SMA-13 in S2 showed a longer duration and a lower deformation rate in the densification stage, and the densification was displayed in its BL for the first 30 min. In the flow deformation stage, the deformation rate of the BLs of S1 and S2 both made of AC-20 was similar, but the deformation volume of the BL of S2 was smaller than that of the BL of S1 finally. In addition, the contribution of the layers to deformation was examined. The contribution of the BL was generally larger than that of the TL on the rutting of multilayer pavement.
Song Li; Fujian Ni; Zili Zhao; Qiao Dong; Jiwang Jiang; Yanjing Zhao. Fractal evaluation of the rutting development for multilayer pavement by wheel tracking test. Construction and Building Materials 2019, 222, 706 -716.
AMA StyleSong Li, Fujian Ni, Zili Zhao, Qiao Dong, Jiwang Jiang, Yanjing Zhao. Fractal evaluation of the rutting development for multilayer pavement by wheel tracking test. Construction and Building Materials. 2019; 222 ():706-716.
Chicago/Turabian StyleSong Li; Fujian Ni; Zili Zhao; Qiao Dong; Jiwang Jiang; Yanjing Zhao. 2019. "Fractal evaluation of the rutting development for multilayer pavement by wheel tracking test." Construction and Building Materials 222, no. : 706-716.
Aggregate packing is a key factor controlling the durability of asphalt mixtures. Considering the complex system of the aggregate structures, multiscale method was utilized by dividing asphalt mixtures into four scales, including asphalt binder, mastic, mortar and asphalt mixtures. Six asphalt mixtures with different gradation types and nominal maximum aggregate size (NMAS) were prepared and the corresponding mastics or mortars were also designed. Comprehensive image analysis methods, including high-resolution scanning, Scanning Electron Microscope (SEM), and Laser Diffraction Analyzer (LDA), were utilized to obtain the 2D images of asphalt mixtures, mortars and mastics. Then, the distribution curves of the binder within mastics, mastic within mortars, and mortar within asphalt mixtures were calculated and compared. New packing indexes were proposed, such as: expected value (Ebinder) and peak value (Pbinder) of the binder distribution at mastic scale, expected value (Emastic) and peak value (Pmastic) of the mastic distribution at mortar scale, expected value (Emortar) and peak value (Pmortar) of the mortar distribution at mixture scale. By comparing with volumetric parameters, it was found that Ebinder and Pbinder could correlate well with the volume ratio of filler to mastic. Emastic could correlate with the volume fraction of fine aggregate within the mortar, but the Pmastic may also influence by the fine aggregate gradation. The void filled with asphalt (VFA) has weak correlation with both packing indexes, Emortar and Pmortar, which indicates that VFA has limitation for evaluation of the packing properties of asphalt mixtures, and more indexes from the internal structure need to be considered.
Jiwang Jiang; Fujian Ni; Xingyu Gu; Linyi Yao; Qiao Dong. Evaluation of aggregate packing based on thickness distribution of asphalt binder, mastic and mortar within asphalt mixtures using multiscale methods. Construction and Building Materials 2019, 222, 717 -730.
AMA StyleJiwang Jiang, Fujian Ni, Xingyu Gu, Linyi Yao, Qiao Dong. Evaluation of aggregate packing based on thickness distribution of asphalt binder, mastic and mortar within asphalt mixtures using multiscale methods. Construction and Building Materials. 2019; 222 ():717-730.
Chicago/Turabian StyleJiwang Jiang; Fujian Ni; Xingyu Gu; Linyi Yao; Qiao Dong. 2019. "Evaluation of aggregate packing based on thickness distribution of asphalt binder, mastic and mortar within asphalt mixtures using multiscale methods." Construction and Building Materials 222, no. : 717-730.
Asphalt mastic is a combination of binder and filler. The binder-filler system within asphalt mixtures plays an important role in adhesion between mineral aggregates. The aging of binders in pavement always happens with fillers inside or contact with mineral aggregates, so it is critical to investigate the evolved rheological property of binder-filler systems during oxidative aging. In this study, simple film oven aging methods for the aging of mastics (binder-filler system) were conducted and verified by comparing the master-curves of aged mastics at different oven positions or different aging times. The frequency sweep test was performed to measure the changing stiffness of mastics with a different combination of binders and filler contents. Test results show that oven positions could influence the aging effect of the mastics significantly, given the influence of circulation. With increasing aging times, the complex modulus increases while phase angle decreases. Comparing the mastics which were first aged then mixed with mastics which were first mixed then aged, it was observed that fillers inside the binder could accelerate aging of the mastics. Additionally, the aging index of mastics with different combinations showed that both the modification of binders and filler contents could affect the aging rate of the mastics.
Hongmei Li; Jiwang Jiang; Song Li; Xiang Ma. Evaluation of the Rheological Property of Binder-Filler Systems after Oxidation Based on a Simple Film Oven Aging Method. Applied Sciences 2019, 9, 2542 .
AMA StyleHongmei Li, Jiwang Jiang, Song Li, Xiang Ma. Evaluation of the Rheological Property of Binder-Filler Systems after Oxidation Based on a Simple Film Oven Aging Method. Applied Sciences. 2019; 9 (12):2542.
Chicago/Turabian StyleHongmei Li; Jiwang Jiang; Song Li; Xiang Ma. 2019. "Evaluation of the Rheological Property of Binder-Filler Systems after Oxidation Based on a Simple Film Oven Aging Method." Applied Sciences 9, no. 12: 2542.
Linyi Yao; Qiao Dong; Fujian Ni; Jiwang Jiang; Xianrong Lu; Yingguang Du. Effectiveness and Cost-Effectiveness Evaluation of Pavement Treatments Using Life-Cycle Cost Analysis. Journal of Transportation Engineering, Part B: Pavements 2019, 145, 04019006 .
AMA StyleLinyi Yao, Qiao Dong, Fujian Ni, Jiwang Jiang, Xianrong Lu, Yingguang Du. Effectiveness and Cost-Effectiveness Evaluation of Pavement Treatments Using Life-Cycle Cost Analysis. Journal of Transportation Engineering, Part B: Pavements. 2019; 145 (2):04019006.
Chicago/Turabian StyleLinyi Yao; Qiao Dong; Fujian Ni; Jiwang Jiang; Xianrong Lu; Yingguang Du. 2019. "Effectiveness and Cost-Effectiveness Evaluation of Pavement Treatments Using Life-Cycle Cost Analysis." Journal of Transportation Engineering, Part B: Pavements 145, no. 2: 04019006.
Not all interconnected pores in porous asphalt concrete (PAC) are valid for permeability, the main purpose of this paper is to distinguish the valid and invalid interconnected pores, and on this basis, to evaluate the distribution of various types of pores, and to propose a new evaluation index of pore distribution, so as to optimize the permeability performance of PAC and provide a new analysis method for the design of PAC materials. In this study, all the voids in the PAC mixture were found to be interconnected, but only approximately 82.1% of the interconnected pores were valid for permeability. A highly linear correlation between void content and valid interconnected pore content was proved, indicating that an accurate prediction could be made for valid pore content based on a simple air void content laboratory measurement. The quality and size distribution of internal air voids were investigated, and the Weibull function was proved to fit all types of air void gradation, especially for valid pores. An analysis of the distribution of void areas shows that the valid and invalid pores are mainly distributed in the size ranges of 2.36 mm to 26.5 mm and 1.18 mm to 9.5 mm, respectively. Moreover, the area proportions of all voids and valid pores in different size ranges show normal distribution patterns. The uniformity indices of air voids such as Ratio of Position Deviation (RPD), Coefficient of Variation of Quantity (CVQ) and Uniformity Index (UI) were found unsuitable for evaluating PAC mixtures. Therefore, a new indicator known as position eccentricity ratio (PER) was proposed and proved to accurately reflect the void distribution uniformity. The statistical results of PER indicate that the invalid interconnected pores are distributed near the central area of the specimen and that the valid interconnected pores are distributed slightly closer to the outer margin.
Yanjing Zhao; Xiaowei Wang; Jiwang Jiang; Lan Zhou. Characterization of interconnectivity, size distribution and uniformity of air voids in porous asphalt concrete using X-ray CT scanning images. Construction and Building Materials 2019, 213, 182 -193.
AMA StyleYanjing Zhao, Xiaowei Wang, Jiwang Jiang, Lan Zhou. Characterization of interconnectivity, size distribution and uniformity of air voids in porous asphalt concrete using X-ray CT scanning images. Construction and Building Materials. 2019; 213 ():182-193.
Chicago/Turabian StyleYanjing Zhao; Xiaowei Wang; Jiwang Jiang; Lan Zhou. 2019. "Characterization of interconnectivity, size distribution and uniformity of air voids in porous asphalt concrete using X-ray CT scanning images." Construction and Building Materials 213, no. : 182-193.
A modified wheel tracking test was developed to investigate the internal structure change of asphalt mixture under wheel loading. The sectional images of two-layer specimens after different loading times were acquired and analyzed by 2D image analysis. Microstructure indices from different positions in the sectional images with reference to the loading point, such as average contact length (Lave), total contact length (Lsum), orientation of contact lines and aggregates (average angle θ and vector magnitude Δ), were obtained. The multi-factor analysis of variance method was used to evaluate the sensitivity of varying microstructure indices to mixture types, locations and loading times and a linear regression model was developed to investigate the relationship between microstructure indices and the average rutting depth. The results show that the internal structure indices Lave, Lsum and θ of contact lines were significantly affected by the loading times. The linear regression shows that multiple of Lave, Lsum and sin value of contact lines’ θ could successfully capture the internal structure change of asphalt mixtures during the wheel loading.
Jiwang Jiang; Fujian Ni; Qiao Dong; Linyi Yao; Xiang Ma. Investigation of the internal structure change of two-layer asphalt mixtures during the wheel tracking test based on 2D image analysis. Construction and Building Materials 2019, 209, 66 -76.
AMA StyleJiwang Jiang, Fujian Ni, Qiao Dong, Linyi Yao, Xiang Ma. Investigation of the internal structure change of two-layer asphalt mixtures during the wheel tracking test based on 2D image analysis. Construction and Building Materials. 2019; 209 ():66-76.
Chicago/Turabian StyleJiwang Jiang; Fujian Ni; Qiao Dong; Linyi Yao; Xiang Ma. 2019. "Investigation of the internal structure change of two-layer asphalt mixtures during the wheel tracking test based on 2D image analysis." Construction and Building Materials 209, no. : 66-76.
This paper aims to develop models to forecast the deterioration of pavement conditions including rutting, roughness, skid-resistance, transverse cracking, and pavement surface distress. A data quality control method was proposed to rebuild the performance data based on the idea of longest increasing or decreasing subsequences. Neural network (NN) was used to develop the five models, and principal component analysis (PCA) was applied to reduce the dimension of traffic variables. The influence of different input variables on the model outputs was discussed respectively by comparing their mean impact values (MIV). Results show that the proposed NN models demonstrated great potential for accurate prediction of pavement conditions, with an average testing R-square of 0.8692. The results of sensitivity analysis revealed that recent pavement conditions may influence the future pavement conditions significantly. Rutting and roughness were sensitive to pavement age and maintenance type. The materials of original pavement asphalt layer were highly relevant to the prediction of pavement roughness, skid-resistance, and pavement surface distress. Moreover, traffic loads obviously affected the pavement skid-resistance and transverse cracking. Pavement and bridge had different effect on surface distress. The material of the base has a remarkable impact on the initiation and development of transverse cracks. Disease treatment in terms of pavement cracking—such as sticking the cracks, excavating and filling the cracks—shows a high MIV in the prediction model of transverse cracking and pavement surface distress.
Linyi Yao; Qiao Dong; Jiwang Jiang; Fujian Ni. Establishment of Prediction Models of Asphalt Pavement Performance based on a Novel Data Calibration Method and Neural Network. Transportation Research Record: Journal of the Transportation Research Board 2019, 2673, 66 -82.
AMA StyleLinyi Yao, Qiao Dong, Jiwang Jiang, Fujian Ni. Establishment of Prediction Models of Asphalt Pavement Performance based on a Novel Data Calibration Method and Neural Network. Transportation Research Record: Journal of the Transportation Research Board. 2019; 2673 (1):66-82.
Chicago/Turabian StyleLinyi Yao; Qiao Dong; Jiwang Jiang; Fujian Ni. 2019. "Establishment of Prediction Models of Asphalt Pavement Performance based on a Novel Data Calibration Method and Neural Network." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 1: 66-82.
Jiwang Jiang; Fujian Ni; Linyi Yao; Qiao Dong. Developing a load-temperature master curve for the permanent deformation of asphalt mixtures by the power function model. Road Materials and Pavement Design 2018, 21, 1359 -1373.
AMA StyleJiwang Jiang, Fujian Ni, Linyi Yao, Qiao Dong. Developing a load-temperature master curve for the permanent deformation of asphalt mixtures by the power function model. Road Materials and Pavement Design. 2018; 21 (5):1359-1373.
Chicago/Turabian StyleJiwang Jiang; Fujian Ni; Linyi Yao; Qiao Dong. 2018. "Developing a load-temperature master curve for the permanent deformation of asphalt mixtures by the power function model." Road Materials and Pavement Design 21, no. 5: 1359-1373.