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Cracking is one of the primary distresses for asphalt pavements. There are many types of laboratory tests developed to evaluate the cracking performance of asphalt material, however, relatively little attention has been dedicated to evaluating and correlating the laboratory measured properties with the actual pavement performance. The main objective of this study is to investigate the relationships between the various laboratory measured binder/mixture properties with the actual pavement cracking (including both fatigue and thermal cracking) performance while also considering the important mix design and pavement structure parameters. Field pavement performance data were collected from 23 project sites with one control HMA section and at least one WMA section at each site. Laboratory testing was performed on the field cores taken from these sections as well as the corresponding extracted and recovered binders. Advanced statistical analysis method including the Pearson correlation and Spearman rank correlation coefficient were then employed to evaluate the correlations between the disparate laboratory measurements and actual pavement performance data. Results show that T*D (thickness of HMA/WMA layer*vertical failure deformation) parameter shows the good correlation with the length of field fatigue cracking, while the Pb%*εb-low (mixture binder content*binder failure strain) parameter shows the good correlation with the length of field thermal cracking. These correlations do not change with varying the pavement type (HMA or WMA). Based on the database generated in this study, a preliminary threshold value of 50 for T*D parameter and 10 for Pb%*εb-low parameter are proposed to minimize and control the cracking problem of asphalt mixtures in general.
Runhua Zhang; Weiguang Zhang; Shihui Shen; Shenghua Wu; Yiming Zhang. Evaluation of the correlations between laboratory measured material properties with field cracking performance for asphalt pavement. Construction and Building Materials 2021, 301, 124126 .
AMA StyleRunhua Zhang, Weiguang Zhang, Shihui Shen, Shenghua Wu, Yiming Zhang. Evaluation of the correlations between laboratory measured material properties with field cracking performance for asphalt pavement. Construction and Building Materials. 2021; 301 ():124126.
Chicago/Turabian StyleRunhua Zhang; Weiguang Zhang; Shihui Shen; Shenghua Wu; Yiming Zhang. 2021. "Evaluation of the correlations between laboratory measured material properties with field cracking performance for asphalt pavement." Construction and Building Materials 301, no. : 124126.
With the advancement in pavement technology, non-destructive testing is getting fame. Intelligent Compaction Measure Value (ICMV) provided from the intelligent compactor has been explored to indicate the pavement stiffness and the compaction quality of asphalt pavement. This study aims to analyze the advanced ICMV and traditional non-nuclear gauge (NNG) density measurements to investigate the relative correlations in compaction measuring/monitoring indicators. This research applies Sakai Compaction Control Value (CCV) to predict the non-nuclear gauge density in means of different machine learning models. For analysis, data were collected from US-52 highway in the United Sates with three passes. Relative percentage change is calculated to measure the overall and individual grid change in density and CCV values with increase of passes. Four different type of models are finally developed include the first three simple ones (pass 1, pass 2, and pass 3 models) to predict the in-place density for different rolling pattern followed by different contractors, and the fourth model (all pass data model) which is developed by joining the data of all passes along with the categorical variable pass count. All model results are reasonably good and significant. Results show that with the inclusion of pass count, model prediction accuracy increases. The pass count is the categorical variable which can affect the model prediction power and provide good results. The possibility of substituting the current practice of quality control testing, NNG, with ICMV was proved throughout this study.
Weiguang Zhang; Ali Raza Khan; Soojin Yoon; Jusang Lee; Runhua Zhang; Kun Zeng. Investigation of the correlations between the field pavement in-place density and the intelligent compaction measure value (ICMV) of asphalt layers. Construction and Building Materials 2021, 292, 123439 .
AMA StyleWeiguang Zhang, Ali Raza Khan, Soojin Yoon, Jusang Lee, Runhua Zhang, Kun Zeng. Investigation of the correlations between the field pavement in-place density and the intelligent compaction measure value (ICMV) of asphalt layers. Construction and Building Materials. 2021; 292 ():123439.
Chicago/Turabian StyleWeiguang Zhang; Ali Raza Khan; Soojin Yoon; Jusang Lee; Runhua Zhang; Kun Zeng. 2021. "Investigation of the correlations between the field pavement in-place density and the intelligent compaction measure value (ICMV) of asphalt layers." Construction and Building Materials 292, no. : 123439.
Engineered cementitious composite (ECC) is a potential cement-based material with the abilities of large deformation and crack width control. However, ECC is difficult to popularize in many developing countries because the costs of silica sand and polyvinyl alcohol (PVA) fiber with a surface coating are too high for practical engineering. Therefore, we proposed an economical ECC with superfine river sand and polypropylene (PP) fiber (SSPP-ECC) to replace PVA fiber and silica sand. The SSPP-ECC proposed in this paper is a sustainable material using local material ingredients, which has considerable adaptability for large-scale engineering applications. The 16 groups of specimens were prepared through a factorial design method, curing for four-point bending tests. The bending strength, deflection, flexural modulus of elasticity, and crack width were measured and calculated during the test. The factor analysis of the test results shows that the contents of fiber and fly ash had significant effects on the ductility of SSPP-ECC with an extra combined effect at the same time, and a response surface model with high accuracy was fitted to predict the yield length of SSPP-ECC. The ductility of SSPP-ECC was positively related to its crack-control ability and it was shown that the crack width of SSPP-ECC increased significantly with a high content of superfine sand. This paper proposed a reasonable way to utilize superfine sand and provided the mix proportion of SSPP-ECC with characteristics of deformation hardening and multi-cracking, which may cater to the demands of many concrete components on ductility and crack resistance.
Zhiqing Zhu; Guojin Tan; Weiguang Zhang; Chunli Wu. Preliminary Analysis of the Ductility and Crack-Control Ability of Engineered Cementitious Composite with Superfine Sand and Polypropylene Fiber (SSPP-ECC). Materials 2020, 13, 2609 .
AMA StyleZhiqing Zhu, Guojin Tan, Weiguang Zhang, Chunli Wu. Preliminary Analysis of the Ductility and Crack-Control Ability of Engineered Cementitious Composite with Superfine Sand and Polypropylene Fiber (SSPP-ECC). Materials. 2020; 13 (11):2609.
Chicago/Turabian StyleZhiqing Zhu; Guojin Tan; Weiguang Zhang; Chunli Wu. 2020. "Preliminary Analysis of the Ductility and Crack-Control Ability of Engineered Cementitious Composite with Superfine Sand and Polypropylene Fiber (SSPP-ECC)." Materials 13, no. 11: 2609.
Field pavement transverse cracking typically can be grouped into two categories, namely thermal cracking that initiates at the surface of the pavement and propagates downward, and reflective cracking that initiates at the pavement layer above the existing pavement cracks or joints and propagates upward. Recently, another transverse cracking phenomenon was noticed in some field investigations but was less studied. Cracks were observed from both the surface and the bottom of field cores, but they cannot be visually observed from the middle layer. In addition, the surface and the bottom cracks lined up well, showing the tendency of meeting each other. This study aimed to evaluate the causes of such transverse cracking phenomena by laboratory tests. Hamburg equipment was used as the evaluation equipment. Some samples were prepared with a saw cut notch 0.33 inches in depth and 0.25 inches in width, and some samples were prepared without the notch at the bottom. The results showed that such a crack type could have happened when samples are aged, the base below the sample is soft, and a notch exists in the bottom layer. A potential mechanism is when the wheel load moves on one side of the existing transverse cracking (the near side), as the specimen on this side tends to bend downward under the wheel load, especially when the support is relatively soft. If without constraint, the other side of the specimen (the far side) should consequently be tilted upward. However, the bonding with the base layer and the self-weight of the specimen restrict the upward movement of the far-side specimen. Therefore, the tensile stress at the surface of the specimen directly on top of the bottom crack is created. At the same time, the bottom crack has the potential of being squeezed and pushed together.
Weiguang Zhang; Ali Raza Khan; Shihui Shen; Yingda Gao. Laboratory Validation of Surface-Initiated Transverse Cracking of Asphalt Pavement. Applied Sciences 2020, 10, 1002 .
AMA StyleWeiguang Zhang, Ali Raza Khan, Shihui Shen, Yingda Gao. Laboratory Validation of Surface-Initiated Transverse Cracking of Asphalt Pavement. Applied Sciences. 2020; 10 (3):1002.
Chicago/Turabian StyleWeiguang Zhang; Ali Raza Khan; Shihui Shen; Yingda Gao. 2020. "Laboratory Validation of Surface-Initiated Transverse Cracking of Asphalt Pavement." Applied Sciences 10, no. 3: 1002.
Through laboratory testing, this research studied the connection between air-void structures of hardened concrete and fresh concrete and discussed the effects of the air-void structure on the salt-frost durability of the concrete. The results demonstrate that, in comparison with fresh concrete, the air-void spacing factor shows a close correlation with hardened concrete air-content and decreases in the form of a power function as the air-content increases. When the fresh concrete air-content is more than 6% and the hardened concrete air-void spacing factor is less than 0.18 mm, the influence of parameters of air-void structure on the salt-frost resistance of the concrete reduces. The air-void spacing factor more significantly affects the salt-frost resistance of the concrete compared with air content and the correlation reaches 0.93. Therefore, air-content and air-void spacing factor are recommended for dual control.
Hui Zhang; Peiwei Gao; Zhixiang Zhang; Youqiang Pan; Weiguang Zhang. Effects of Parameters of Air-Avid Structure on the Salt-Frost Durability of Hardened Concrete. Applied Sciences 2020, 10, 632 .
AMA StyleHui Zhang, Peiwei Gao, Zhixiang Zhang, Youqiang Pan, Weiguang Zhang. Effects of Parameters of Air-Avid Structure on the Salt-Frost Durability of Hardened Concrete. Applied Sciences. 2020; 10 (2):632.
Chicago/Turabian StyleHui Zhang; Peiwei Gao; Zhixiang Zhang; Youqiang Pan; Weiguang Zhang. 2020. "Effects of Parameters of Air-Avid Structure on the Salt-Frost Durability of Hardened Concrete." Applied Sciences 10, no. 2: 632.
Semi-flexible composite mixture (SFCM) is developed based on a unique material design concept of pouring cement mortar into the voids formed by open graded asphalt mixture. It combines the flexibility of asphalt concrete and the stiffness of Portland cement concrete and has many advantages comparing to conventional roadway paving materials. The main objective of this paper was to evaluate the engineering properties of SFCM and assess the constructability of the SFCM. A slab SFCM sample was fabricated in the laboratory to simulate the filling of cement mortar in the field. Performance testing was carried out by indirect tensile (IDT) test because it was found to be able to correlate with the field performance of asphalt mixtures at low, intermediate, and high temperatures. They were used in this study to evaluate the thermal cracking, fatigue, rutting, as well as moisture resistance of SFCM. A control hot mix asphalt (HMA) mixture was used to compare with the results of SFCM. Based on the testing results, it was found that the designed SFCM showed good filling capability of cement mortar. SFCM had higher dynamic modulus than the control HMA. It had good resistance to rutting and moisture damage. Based on fracture work, SFCM showed better resistance to thermal cracking while lower resistance to fatigue cracking.
Weiguang Zhang; Shihui Shen; Ryan Douglas Goodwin; Dalin Wang; Jingtao Zhong. Performance Characterization of Semi-Flexible Composite Mixture. Materials 2020, 13, 342 .
AMA StyleWeiguang Zhang, Shihui Shen, Ryan Douglas Goodwin, Dalin Wang, Jingtao Zhong. Performance Characterization of Semi-Flexible Composite Mixture. Materials. 2020; 13 (2):342.
Chicago/Turabian StyleWeiguang Zhang; Shihui Shen; Ryan Douglas Goodwin; Dalin Wang; Jingtao Zhong. 2020. "Performance Characterization of Semi-Flexible Composite Mixture." Materials 13, no. 2: 342.
Clay ball is a pavement surface defect which refers to a clump in which clay or dirt is mixed with hot asphalt mixture. Clay ball is typically caused by a combination of aggregate contamination of clay or soil, high aggregate moisture, and low production temperature at the asphalt plant. It usually appears a few weeks or months after paving under traffic load, after being liquefied and knocked from the pavement surface. Clay balls can be the source of potholing, raveling, and other issues such as moisture infiltration and reduced ride quality. This paper presents an investigation of the clay balls on US-31 one winter after construction in Hamilton County, Indiana. In order to understand the pavement condition, their severity was measured using both visual observation and infrared image collection system. In addition, a clay ball amount, its distribution pattern, and cores condition were evaluated. A precipitation effect on clay ball formation was investigated for finding a cause of the clay balls. The investigation found that infrared image collection system was appropriate in detecting the clay balls. The clay balls were elliptic in shape with 2.5 cm to 10 cm in diameter, and the maximum clay ball depth was almost penetrating the entire surface course. It was also found that the asphalt paving on the raining days or right after raining could increase the potential of clay balls. Monitoring of aggregate moisture during construction on or after raining days should be able to reduce the risk of clay balls.
Weiguang Zhang; Jusang Lee; Hyung Jun Ahn; QiQi Le; Meng Wu; Haoran Zhu; Jing Zhang. Field Investigation of Clay Balls in Full-Depth Asphalt Pavement. Materials 2019, 12, 2879 .
AMA StyleWeiguang Zhang, Jusang Lee, Hyung Jun Ahn, QiQi Le, Meng Wu, Haoran Zhu, Jing Zhang. Field Investigation of Clay Balls in Full-Depth Asphalt Pavement. Materials. 2019; 12 (18):2879.
Chicago/Turabian StyleWeiguang Zhang; Jusang Lee; Hyung Jun Ahn; QiQi Le; Meng Wu; Haoran Zhu; Jing Zhang. 2019. "Field Investigation of Clay Balls in Full-Depth Asphalt Pavement." Materials 12, no. 18: 2879.
Non-destructive ultrasonic testing has attained popularity due to its robustness and cost-effectiveness in monitoring the structural health and performance evaluation of pavements, thus replacing traditional methods. This paper presents the application of an explicit finite element method for the modeling of ultrasonic wave propagation through asphalt concrete. Prior to modeling, non-destructive ultrasonic testing was conducted on four different types of asphalt concrete (AC-13, SMA-13, AC-20, and AM-20). Based on acoustic information (wave velocity) obtained in non-destructive testing (NDT) and density, the dynamic moduli of these asphalt concretes were evaluated and used in numerical modeling of ultrasonic wave propagation using the commercial software package ABAQUS. The ultrasonic wave results obtained by numerical modeling were compared with experimental results. This comparison showed a good fit between the finite element (FE) results and the experimental results and confirmed a good FE approach for ultrasonic wave propagation. In addition, the influence of varying dynamic moduli, density, varying location, and crack size/depth on ultrasonic wave propagation was analyzed.
Weiguang Zhang; Muhammad Arfan Akber; Shuguang Hou; Jiang Bian; Dong Zhang; QiQi Le. Detection of Dynamic Modulus and Crack Properties of Asphalt Pavement Using a Non-Destructive Ultrasonic Wave Method. Applied Sciences 2019, 9, 2946 .
AMA StyleWeiguang Zhang, Muhammad Arfan Akber, Shuguang Hou, Jiang Bian, Dong Zhang, QiQi Le. Detection of Dynamic Modulus and Crack Properties of Asphalt Pavement Using a Non-Destructive Ultrasonic Wave Method. Applied Sciences. 2019; 9 (15):2946.
Chicago/Turabian StyleWeiguang Zhang; Muhammad Arfan Akber; Shuguang Hou; Jiang Bian; Dong Zhang; QiQi Le. 2019. "Detection of Dynamic Modulus and Crack Properties of Asphalt Pavement Using a Non-Destructive Ultrasonic Wave Method." Applied Sciences 9, no. 15: 2946.
The main objective of this paper was to develop a mesostructure-based finite element model of rubber modified asphalt mixture to predict both the dynamic modulus master curve and phase angle master curve under a large frequency range. The asphalt mixture is considered as a three-phase material consisting of aggregate, asphalt mortar, and air void. The mesostructure of the asphalt mixture was digitized by a computed tomography (CT) scan and implemented into finite element software. The 2S2P1D model was used to obtain the viscoelastic information of an asphalt mortar under a large range of frequencies and temperatures. The continuous spectrum of the 2S2P1D model was converted to a discrete spectrum and characterized by the generalized Maxwell model for numerical simulation. The Prony series parameters of the generalized Maxwell model and the elastic modulus of the aggregates were inputted into the finite element analysis as material properties. The dynamic modulus tests of a rubber modified asphalt mortar and asphalt mixture were conducted under different temperatures and loading frequencies. The dynamic modulus master curve and phase angle master curve of both asphalt mortar and asphalt mixture were constructed. The frequency of the finite element simulations of the dynamic modulus tests ranged from 10−6 to 104. The dynamic modulus and phase angle of the asphalt mixture was calculated and the master curves were compared with the master curves obtained from the experimental data. Furthermore, the effect of the elastic modulus of aggregates on the master curves was analyzed. Acceptable agreement between dynamic modulus master curves obtained from experimental data and simulation results was achieved. However, large errors between phase angle master curves appeared at low frequencies. A method was proposed to improve the prediction of the phase angle master curve by adjusting the equilibrium modulus of the asphalt mortar.
Linhao Gu; Luchuan Chen; Weiguang Zhang; Haixia Ma; Tao Ma. Mesostructural Modeling of Dynamic Modulus and Phase Angle Master Curves of Rubber Modified Asphalt Mixture. Materials 2019, 12, 1667 .
AMA StyleLinhao Gu, Luchuan Chen, Weiguang Zhang, Haixia Ma, Tao Ma. Mesostructural Modeling of Dynamic Modulus and Phase Angle Master Curves of Rubber Modified Asphalt Mixture. Materials. 2019; 12 (10):1667.
Chicago/Turabian StyleLinhao Gu; Luchuan Chen; Weiguang Zhang; Haixia Ma; Tao Ma. 2019. "Mesostructural Modeling of Dynamic Modulus and Phase Angle Master Curves of Rubber Modified Asphalt Mixture." Materials 12, no. 10: 1667.
The particle clustering phenomena in reclaimed asphalt pavement (RAP) particles is one of the most important factors to affect the efficient recycling of asphalt concrete. In this study, the particle composition, clustering degree, crushing properties and clustering stability of RAP were studied by extraction test and cantabro-crushing test. It was found that the particles above 4.75 mm were composed mainly of small particles with a large degree of cluster and poor stability. The coarse particles (>4.75 mm) had a great influence on the variation of 4.75 mm sieve. Quantitative indexes of Percentage Loss rate (PL) and Stability Index (w) were proposed to evaluate the clustering degree and the stability of RAP. It provided a meaningful reference for the comparison of different RAP and the different crushing processes. In addition, the RAP could be divided into three kinds of structures, including weak cluster structure, strong cluster structure and old aggregate. The process of crushing the RAP was divided into three stages, which are weak structure-dominated, strong structure-dominated and the broken old aggregate. The weak structure had the largest degree of cluster and worst stability, resulting in a large variability of RAP, and it should be avoided in the crushing process.
Guangji Xu; Tao Ma; Zhanyong Fang; XiaoMing Huang; Weiguang Zhang. The Evaluation Method of Particle Clustering Phenomena in RAP. Applied Sciences 2019, 9, 424 .
AMA StyleGuangji Xu, Tao Ma, Zhanyong Fang, XiaoMing Huang, Weiguang Zhang. The Evaluation Method of Particle Clustering Phenomena in RAP. Applied Sciences. 2019; 9 (3):424.
Chicago/Turabian StyleGuangji Xu; Tao Ma; Zhanyong Fang; XiaoMing Huang; Weiguang Zhang. 2019. "The Evaluation Method of Particle Clustering Phenomena in RAP." Applied Sciences 9, no. 3: 424.
Due to the difficulty of obtaining relaxation modulus directly from experiments, many interconversion methods from other viscoelastic functions to relaxation modulus were developed in previous years. The objectives of this paper were to analyze the difference of relaxation modulus converted from dynamic modulus and creep compliance and explore its potential causes. The selected methods were the numerical interconversions based on Prony series representation. For the dynamic to relaxation conversion, the time spectrum was determined by the collocation method. Meanwhile, for the creep to relaxation conversion, both the collocation method and least squares method were adopted to perform the Laplace transform. The results show that these two methods do not present a significant difference in estimating relaxation modulus. Their difference mostly exists in the transient reduced time region. Calculating the average of two methods is suggested to avoid great deviation of single experiment. To predict viscoelastic responses from creep compliance, the collocation method yields comparable results to the least squares method. Thus, simply-calculated collocation method may be preferable in practice. Further, the master curve pattern is sensitive to the Prony series coefficients. The difference in transient reduced time region may be attributed to the indeterminate Prony series coefficients.
Weiguang Zhang; Bingyan Cui; Xingyu Gu; Qiao Dong. Comparison of Relaxation Modulus Converted from Frequency- and Time-Dependent Viscoelastic Functions through Numerical Methods. Applied Sciences 2018, 8, 2447 .
AMA StyleWeiguang Zhang, Bingyan Cui, Xingyu Gu, Qiao Dong. Comparison of Relaxation Modulus Converted from Frequency- and Time-Dependent Viscoelastic Functions through Numerical Methods. Applied Sciences. 2018; 8 (12):2447.
Chicago/Turabian StyleWeiguang Zhang; Bingyan Cui; Xingyu Gu; Qiao Dong. 2018. "Comparison of Relaxation Modulus Converted from Frequency- and Time-Dependent Viscoelastic Functions through Numerical Methods." Applied Sciences 8, no. 12: 2447.
The laboratory aging tests for binders were developed based on Strategic Highway Research Program (SHRP) tests in the 1990s (i.e., performance grading); the applicability of performance grade (PG) to recently developed tests, such as multiple stress creep recovery (MSCR), is not clear. In addition, the ability of laboratory aging to represent field pavement aging, especially when polymer-modified asphalt (PMA) and warm-mix asphalt (WMA) binders are used, has been a concern to paving practice. This paper investigates quantitatively the level of laboratory aging compared to the field aging for both the control hot-mix asphalt (HMA) binders and WMA and PMA binders. The study focuses on a number of binder parameters, as well as evaluating whether the current laboratory aging conditions (loose-mix oven aging) will provide correlation to field short-term aging. HMA and WMA binders from four field projects that covered different climatic zones, pavement structures, and materials were selected. Binder properties including high-temperature PG, MSCR nonrecoverable creep compliance, low-temperature binder PG, and fracture energy were used for analysis. The results show that the laboratory rolling thin-film oven (RTFO) aging method is not sufficient to simulate field short-term aging conditions for most cases except for the low-temperature PG test. The aging of asphalt binder is parameter sensitive; depending on the parameters used, the comparison results between laboratory aging and field aging could be different. The effect of aging on PMA binder, especially when mixed with Sasobit additive, differs from non-polymer-modified binders. Limited results from non-polymer-modified binder mixes suggested that loose-mix oven aging at 85°C for 2, 5, and 7 days appears to provide a reasonable simulation of field pavement aging right after compaction (0 years), 1.8 years, and 3 years.
Weiguang Zhang; Amirmohammad Bahadori; Shihui Shen; Shenghua Wu; Balasingam Muhunthan; Louay Mohammad. Comparison of Laboratory and Field Asphalt Aging for Polymer-Modified and Warm-Mix Asphalt Binders. Journal of Materials in Civil Engineering 2018, 30, 04018150 .
AMA StyleWeiguang Zhang, Amirmohammad Bahadori, Shihui Shen, Shenghua Wu, Balasingam Muhunthan, Louay Mohammad. Comparison of Laboratory and Field Asphalt Aging for Polymer-Modified and Warm-Mix Asphalt Binders. Journal of Materials in Civil Engineering. 2018; 30 (7):04018150.
Chicago/Turabian StyleWeiguang Zhang; Amirmohammad Bahadori; Shihui Shen; Shenghua Wu; Balasingam Muhunthan; Louay Mohammad. 2018. "Comparison of Laboratory and Field Asphalt Aging for Polymer-Modified and Warm-Mix Asphalt Binders." Journal of Materials in Civil Engineering 30, no. 7: 04018150.
Based on the Aggregate Imaging Measurement System (AIMS) and the Particle Flow Code in Two Dimensions (PFC2D), an algorithm for modeling two-dimensional virtual aggregates was proposed in this study. To develop the virtual particles precisely, the realistic shapes of the aggregates were captured by the AIMS firstly. The shape images were then processed, and the morphological characteristics of aggregates were quantified by the angularity index. By dividing the particle irregular shape into many triangle areas and adjusting the positions of the generated balls via coordinate systems’ conversion within PFC2D, the virtual particles could be reconstructed accurately. By calculating the mapping area, the gradations in two-dimensions could be determined. Controlled by two variables (μ_1 and μ_2), which were drawn from the uniform distribution (0, 1), the virtual particles forming the specimens could be developed with random sizes and angular shapes. In the end, the rebuilt model of the SMA-13 aggregate skeleton was verified by the virtual penetration tests. The results indicated that the proposed algorithm can not only model the realistic particle shape and gradations precisely, but also predict its mechanical behavior well.
Danhua Wang; Xunhao Ding; Tao Ma; Weiguang Zhang; Deyu Zhang. Algorithm for Virtual Aggregates’ Reconstitution Based on Image Processing and Discrete-Element Modeling. Applied Sciences 2018, 8, 738 .
AMA StyleDanhua Wang, Xunhao Ding, Tao Ma, Weiguang Zhang, Deyu Zhang. Algorithm for Virtual Aggregates’ Reconstitution Based on Image Processing and Discrete-Element Modeling. Applied Sciences. 2018; 8 (5):738.
Chicago/Turabian StyleDanhua Wang; Xunhao Ding; Tao Ma; Weiguang Zhang; Deyu Zhang. 2018. "Algorithm for Virtual Aggregates’ Reconstitution Based on Image Processing and Discrete-Element Modeling." Applied Sciences 8, no. 5: 738.
Fatigue resistance quantification of modified asphalt is typically time consuming and may not correlate well with mixture fatigue test results. In this paper, the applicability of a multiple stress creep and recovery (MSCR) test on asphalt binder’s fatigue resistance was evaluated. Six binder types with a variety of modifiers and different modifier contents were characterized. The MSCR test was conducted and its sensitivity to binder type and additive content under different aging durations was evaluated. Mixture fatigue tests including a semi-circular bending- Illinois flexibility index test and indirect tensile strength were conducted using control base asphalt and SBS modified asphalt. A ranking between the binder MSCR and mixture fracture test results was conducted to check if the MSCR result was representative of the mixture’s fatigue resistance. Results indicate that the MSCR test at intermediate temperatures (20 °C, 25 °C, and 30 °C) can be performed with good repetitions. It was also found that the MSCR test was sensitive enough to differentiate the fatigue resistance among different binder types and additive contents. The ranking analysis shows that the binder MSCR test at intermediate temperatures showed a similar ranking to the mixture’s fatigue tests, indicating that the binder MSCR test could be potentially utilized to represent a mixture’s fatigue resistance where binder selection is a major concern. It was also found that the SBS modified binder showed the best crack resistance and was less affected by aging.
Weiguang Zhang; Tao Ma; Gang Xu; XiaoMing Huang; Meng Ling; Xiao Chen; Jiayue Xue. Fatigue Resistance Evaluation of Modified Asphalt Using a Multiple Stress Creep and Recovery (MSCR) Test. Applied Sciences 2018, 8, 417 .
AMA StyleWeiguang Zhang, Tao Ma, Gang Xu, XiaoMing Huang, Meng Ling, Xiao Chen, Jiayue Xue. Fatigue Resistance Evaluation of Modified Asphalt Using a Multiple Stress Creep and Recovery (MSCR) Test. Applied Sciences. 2018; 8 (3):417.
Chicago/Turabian StyleWeiguang Zhang; Tao Ma; Gang Xu; XiaoMing Huang; Meng Ling; Xiao Chen; Jiayue Xue. 2018. "Fatigue Resistance Evaluation of Modified Asphalt Using a Multiple Stress Creep and Recovery (MSCR) Test." Applied Sciences 8, no. 3: 417.