Design a Thermosetting Asphalt Mixture for Surfacing on Orthotropic Steel Deck Bridge

2013 ◽  
Vol 652-654 ◽  
pp. 1221-1225
Author(s):  
Chun Chen ◽  
Zhen Dong Qian ◽  
Yong Quan Wang
Keyword(s):  
Design Method ◽  
Mixing Time ◽  
Asphalt Mixture ◽  
Design Procedure ◽  
Mixture Design ◽  
Asphalt Mixtures ◽  
Air Voids ◽  
Orthotropic Steel Deck ◽  
Epoxy Asphalt ◽  
Steel Deck

According to Superpave mix design method, a thermosetting material (Epoxy Asphalt mixture) was designed for surfacing on orthotropic steel deck bridge. Firstly, based on the thermosetting feature, the viscosity increasing law of EA binder was studied by Brookfield test. Then, some characteristic indexes of EA mixture, such as the prior mixing time and the reserved time, were determined according to the viscosity increasing law and recommended viscosity range for mixing and compaction. Finally, using these characteristic indexes, an EA mixture with 3.0% air voids was designed by volumetric mixture design procedure of Superpave method. The results show: 1) different from other asphalt mixtures, the characteristic indexes of end mixing time and reserved time should be applied in EA mixture design because of the thermosetting character of EA binder; 2) the EA mixture designed by Superpave method in this paper has a higher EA binder content than that designed by conventional Marshall method.

Research on Low Temperature Performance of Epoxy Asphalt Mixture

2010 ◽  
Vol 34-35 ◽  
pp. 1124-1128 ◽  
Author(s):  
Sang Luo ◽  
Zhen Dong Qian
Keyword(s):  
Low Temperature ◽  
Asphalt Mixture ◽  
Bending Test ◽  
Thermal Contraction ◽  
Orthotropic Steel Deck ◽  
Temperature Performance ◽  
Epoxy Asphalt ◽  
Specimen Test ◽  
Low Temperature Performance ◽  
Steel Deck

Low-temperature cracking is a significant and costly problem for pavement on the orthotropic steel deck. As a popular material used on the steel deck pavement, the low-temperature performance of epoxy asphalt mixture was investigated. In this research, the three-point bending test, the thermal stress restrained specimen test (TSRST) and the coefficient of thermal contraction test were conducted to achieve the flexural strain energy, the fracture temperature, and the coefficient of thermal contraction respectively. Test results show that epoxy asphalt mixture performs excellently on low-temperature properties and has a prominent deformation compliance with the steel deck. Findings from the research indicate that epoxy asphalt mixture is an alternative material paved on the orthotropic steel deck due to its profound low-temperature performance.

scholarly journals Implementing the Superpave 5 Asphalt Mixture Design Method in Indiana

2020 ◽  
Author(s):  
John E. Haddock ◽  
Reyhaneh Rahbar-Rastegar ◽  
M. Reza Pouranian ◽  
Miguel Montoya ◽  
Harsh Patel
Keyword(s):  
Design Method ◽  
Asphalt Mixture ◽  
Field Trials ◽  
Mixture Design ◽  
Department Of Transportation ◽  
Aggregate Gradation ◽  
Air Voids ◽  
Depth Analysis ◽  
Mat Density ◽  
Statistical Metrics

Recent research developments have indicated that asphalt mixture durability and pavement life can be increased by modifying the Superpave asphalt mixture design method to achieve an in-place density of 95%, approximately 2% higher than the density requirements of conventionally designed Superpave mixtures. Doing so requires increasing the design air voids content to 5% and making changes to the mixture aggregate gradation so that effective binder content is not lowered. After successful laboratory testing of this modified mixture design method, known as Superpave 5, two controlled field trials and one full scale demonstration project, the Indiana Department of Transportation (INDOT) let 12 trial projects across the six INDOT districts based on the design method. The Purdue University research team was tasked with observing the implementation of the Superpave 5 mixture design method, documenting the construction and completing an in-depth analysis of the quality control and quality assurance (QC/QA) data obtained from the projects. QC and QA data for each construction project were examined using various statistical metrics to determine construction performance with respect to INDOT Superpave 5 specifications. The data indicate that, on average, the contractors achieved 5% laboratory air voids, which coincides with the Superpave 5 recommendation of 5%. However, on average, the as-constructed mat density of 93.8% is roughly 1% less than the INDOT Superpave 5 specification. It is recommended that INDOT monitor performance of the Superpave 5 mixtures and implement some type of additional training for contractor personnel, in order to help them increase their understanding of Superpave 5 concepts and how best to implement the design method in their operation.

Development of a Balanced Mix Design Method in Oregon to Improve Long-Term Pavement Performance

2021 ◽  
pp. 036119812110322
Author(s):  
Shashwath Sreedhar ◽  
Erdem Coleri ◽  
Ihsan Ali Obaid ◽  
Vikas Kumar
Keyword(s):  
New Technologies ◽  
Design Method ◽  
Complex Structure ◽  
Asphalt Mixture ◽  
Mixture Design ◽  
Design Methods ◽  
Binder Content ◽  
Asphalt Mixtures ◽  
Mix Design

Most state Departments of Transportation (DOTs) and asphalt contractors do not think that commonly used asphalt mixture properties, such as voids in mineral aggregate (VMA), voids filled with asphalt (VFA), and dust-to-binder ratio, reflect the long-term performance of asphalt mixtures. In addition, there are several new additives, polymers, rubbers, and high-quality binder types incorporated into asphalt mixtures today. Volumetric mixture design methods are not capable of capturing the benefits of using all these new technologies on asphalt mixture performance. Furthermore, the interaction of virgin binders with reclaimed asphalt pavement (RAP) mixtures with high binder replacement contents and the level of RAP binder blending into the asphalt mixture are still not well understood. Because of all these complications related to the more complex structure of asphalt mixtures, simple volumetric evaluations to determine the optimum binder content may not result in reliable asphalt mixture designs. Two volumetrically identical mixtures may provide completely different rutting and cracking performance according to laboratory tests. For all these reasons, in this study performance tests for rutting and cracking are incorporated into current asphalt mixture design methods to make it possible to validate or revise the optimum binder content determined by the volumetric mix design method (the only method currently used for asphalt mix design).

scholarly journals Fracture Behavior Analysis of Semi-Circular Bending Test

2019 ◽  
Vol 271 ◽  
pp. 03007
Author(s):  
David Renteria ◽  
Shadi Saadeh ◽  
Enad Mahmoud
Keyword(s):  
Fracture Behavior ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Bending Test ◽  
Random Generation ◽  
Crack Initiation And Propagation ◽  
Air Voids ◽  
Generation Technique ◽  
Initiation And Propagation ◽  
Scb Test

The objective of this paper is to investigate the effect of air voids on the fracture properties of asphalt mixtures using SCB test in Discrete Element Method (DEM). Superpave and Coarse Matrix High Binder (CMHB) mixtures gradation were used to generate the percentages of aggregate, mastic, and air voids within the specimens. Aggregates and air voids were randomly generated for each asphalt mixture case. Model results illustrate that the crack initiation and propagation is controlled by the location of the aggregate particles and air voids in the mixture. Additionally, the absence of air voids above the tip of the notch increases the stiffness of the sample and increase its resistance to failure. The novelty of using DEM and the random generation technique for generating numerical specimens proved to be a useful approach in investigating the properties of the mastic, aggregate and interface as they relate to fracture of asphalt mixtures.

Mix Design Method of the SMC Cold Temperature Modified Asphalt Mixture

2017 ◽  
Vol 744 ◽  
pp. 185-189
Author(s):  
Miao Miao Tian ◽  
Chao Yang Guo ◽  
Jin Yan ◽  
Ya Fei Li
Keyword(s):  
Design Method ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Cold Temperature ◽  
Subzero Temperature ◽  
Modified Asphalt ◽  
Harmful Emission ◽  
Long Time ◽  
Special Environment ◽  
Technology Level

The SMC cold temperature asphalt mixture consumed less energy and harmful emission compares with the traditional HMA and WMA, and it can be worked at the subzero temperature or after a long time storage, which makes the construction and maintenance of the asphalt pavement in a special environment (low temperature) and special conditions (without a hot mix station) come true. It has been widely used in Beijing, Xinjiang, Sichuan, Tibet, etc. with a satisfied performance. Highway construction and maintenance technology level of China would be positively promoted by using the SMC asphalt mixtures.

A Sixteen-Year Review of Condition Survey and Analysis of Steel Deck Pavement on Jiangyin Yangtze River Bridge

2016 ◽  
Vol 873 ◽  
pp. 91-95 ◽  
Author(s):  
Jing Ding ◽  
Sang Luo
Keyword(s):  
Yangtze River ◽  
Pavement Condition ◽  
Orthotropic Steel Deck ◽  
Epoxy Asphalt ◽  
Site Survey ◽  
Truck Loading ◽  
Research Findings ◽  
Pavement Distresses ◽  
Pavement Structures ◽  
Steel Deck

To obtain a complete picture of the steel deck pavement condition on Jiangyin Yangtze River Bridge, an on-site survey for different pavement structures was conducted to collect information regarding traffic volume and extents of pavement distresses, including gussaphalt pavement, gussasphalt lower plus epoxy asphalt above pavement and double-layer epoxy asphalt pavement. The pavement performance under the combination of heavy truck loading and extreme climate condition was discussed to summarize the technology requirements of orthotropic steel deck pavement. The research findings provide reference for orthotropic steel deck paving worldwide.

Microstructural analysis of asphalt mixtures using digital image processing techniques

2014 ◽  
Vol 41 (1) ◽  
pp. 74-86 ◽  
Author(s):  
Ki Hoon Moon ◽  
Augusto Cannone Falchetto ◽  
Jin Hoon Jeong
Keyword(s):  
Image Processing ◽  
Digital Image Processing ◽  
Digital Image ◽  
Microstructural Analysis ◽  
Asphalt Mixture ◽  
Material Model ◽  
Asphalt Mixtures ◽  
Recycled Asphalt ◽  
Air Voids ◽  
Processing Techniques

In this paper, the internal microstructure of asphalt mixture is analyzed through digital image processing (DIP) of two-dimensional asphalt mixture images. A set of 12 mixtures prepared with two binders, two air voids percentages, and different recycled asphalt pavement (RAP) contents is used. First, small asphalt mixture beams of the same size of bending beam rheometer specimens are prepared for the images acquisition. Then, based on mixture volumetric properties, a three-phase material model is obtained. Finally, 2- and 3-point correlation functions of the material phases are numerically evaluated. No significant differences were observed in the microstructure and spatial distributions of aggregates, asphalt mastic, and air voids for asphalt mixtures containing up to 40% of RAP. However, an increase in auto correlation length (ACL) was found for RAP mixtures in comparison with the conventional mixtures.

scholarly journals Influence Analysis and Optimization for Aggregate Morphological Characteristics on High- and Low-Temperature Viscoelasticity of Asphalt Mixtures

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2034 ◽  
Author(s):  
Yongchun Cheng ◽  
Wensheng Wang ◽  
Jinglin Tao ◽  
Meng Xu ◽  
Xiaoli Xu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Viscoelastic Properties ◽  
Viscoelastic Model ◽  
Asphalt Mixture ◽  
Morphological Characteristics ◽  
Relaxation Modulus ◽  
Mixture Design ◽  
Asphalt Mixtures ◽  
Raw Material ◽  
Viscoelastic Parameters

Aggregate is an indispensable raw material for asphalt pavement construction. This study evaluates the influences of aggregate morphological characteristics on the high- and low-temperature viscoelasticity of asphalt mixtures. Based on simplex lattice mixture design (SLD), asphalt mix samples were designed and prepared with the same gradation but three different types of aggregates. Subsequently, three morphological characteristics of aggregate (roundness, perimeter index, and erosion-dilation area ratio) are presented to characterize fine and coarse aggregates. Then based on Burgers viscoelastic model, uniaxial compression static creep test was carried out to analyze the high-temperature viscoelastic properties for asphalt mortar and mixture. Meanwhile fitting Prony series models have been utilized to represent relaxation modulus conversed from creep compliance and the low-temperature relaxation characteristics can be also discussed. The experimental results indicated that morphological characteristics of aggregate, especially fine aggregates, are strongly correlated with the viscoelastic parameters of asphalt mixtures. However, the complex morphological characteristics of aggregates have opposite influences on the high- and low-temperature viscoelastic parameters. Therefore, when considering both high- and low-temperature viscoelastic properties, the aggregate proportion was optimized for the appropriate morphological characteristics, which will provide a reference for asphalt mixture design.

Parent Asphalt Mixture Design of Semi-Flexible Pavement Based on Method of Main Mineral Aggregate Void Filling

2012 ◽  
Vol 446-449 ◽  
pp. 2599-2602 ◽  
Author(s):  
Guo Liang Yang ◽  
Kuang Huai Wu ◽  
Wei Ming Wang ◽  
Fan Bing Meng ◽  
Yan Feng Li ◽  
...  
Keyword(s):  
Design Method ◽  
Asphalt Mixture ◽  
Flexible Pavement ◽  
Mixture Design ◽  
Material Composition ◽  
Mineral Aggregate ◽  
Technical Performance ◽  
Technical Requirements ◽  
Void Structure ◽  
Volume Characteristics

Semi-flexible pavement was a type of pavements in good service performance and its material composition belonged to dense-skeleton structure. However, the material composition of its parent asphalt mixture was a form of skeleton-void structure. In order to achieve better volume characteristics and technical performance of parent asphalt mixture, the parent asphalt mixture design method of semi-flexible pavement based on main mineral aggregate void filling was developed. The parent asphalt mixture was studied using Marshall test and the results indicated that all volume parameters and technical performance indicators of parent asphalt mixture completely satisfied the corresponding technical requirements. The effectiveness of method of main mineral aggregate void filling to design parent asphalt mixture was verified.

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