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Low Temperature Performance Of Bio-Derived/Chemical Additives In Warm Mix Asphalt, Joseph H. Podolsky, Jesse Studer, R. Christopher Williams, Eric W. Cochran 2018 Iowa State University

Low Temperature Performance Of Bio-Derived/Chemical Additives In Warm Mix Asphalt, Joseph H. Podolsky, Jesse Studer, R. Christopher Williams, Eric W. Cochran

Eric W. Cochran

Corn and soy based bio-derived warm mix asphalt (WMA) additives are currently being developed. In the past, additives with similar properties have been shown to successfully reduce the mixing and compaction temperatures of asphalt by as much as 30°C. Isosorbide distillation bottoms (IDB), a WMA additive, is a co-product from the conversion of sorbitol to isosorbide, where sorbitol is derived by hydrogenating glucose from corn biomass. Past research utilizing IDB at several dosage rates showed there was improvement in low temperature binder performance using the bending beam rheometer (BBR) between dosage rates of 0.5% and 1.0% by ...


A Comparative Analysis Of Mix Proportioning For Prescriptive And Performance-Based Specifications For Sustainability, Peter C. Taylor, Halil Ceylan 2017 Iowa State University

A Comparative Analysis Of Mix Proportioning For Prescriptive And Performance-Based Specifications For Sustainability, Peter C. Taylor, Halil Ceylan

Halil Ceylan

With the recent advancements in concrete technology, design and production of “green concrete” is increasing in demand. Although, the production of structures that are entirely sustainable is still challenging, industry has shown progress by motivating alternative solutions to conventional concrete such as using recycled aggregates, binary and ternary mixes with high levels of supplementary cementitious materials, and alternative binders with different chemistry with lower carbon footprints than portland cement. However, mix proportioning guidelines for performance-based specifications have fallen behind these advancements. ACI 211, the mostcommonly used mix proportioning guideline for prescriptive-based specifications, is primarily focused on structural concrete, and has ...


Low Temperature Performance Of Bio-Derived/Chemical Additives In Warm Mix Asphalt, Joseph H. Podolsky, Jesse Studer, R. Christopher Williams, Eric W. Cochran 2017 Iowa State University

Low Temperature Performance Of Bio-Derived/Chemical Additives In Warm Mix Asphalt, Joseph H. Podolsky, Jesse Studer, R. Christopher Williams, Eric W. Cochran

R. Christopher Williams

Corn and soy based bio-derived warm mix asphalt (WMA) additives are currently being developed. In the past, additives with similar properties have been shown to successfully reduce the mixing and compaction temperatures of asphalt by as much as 30°C. Isosorbide distillation bottoms (IDB), a WMA additive, is a co-product from the conversion of sorbitol to isosorbide, where sorbitol is derived by hydrogenating glucose from corn biomass. Past research utilizing IDB at several dosage rates showed there was improvement in low temperature binder performance using the bending beam rheometer (BBR) between dosage rates of 0.5% and 1.0% by ...


Performance Evaluation Of Coarse-Graded Field Mixtures Using Dynamic Modulus Results Gained From Testing In The Indirect Tension Mode, Parnian Ghasemi, Joseph H. Podolsky, R. Christopher Williams, Eshan Dave 2017 Iowa State University

Performance Evaluation Of Coarse-Graded Field Mixtures Using Dynamic Modulus Results Gained From Testing In The Indirect Tension Mode, Parnian Ghasemi, Joseph H. Podolsky, R. Christopher Williams, Eshan Dave

R. Christopher Williams

Historically, asphalt mixtures in Minnesota have been produced with fine gradations. However, recently more coarse-graded mixtures are being produced as they require less asphalt binder. Thus, it is important that pavement performance for coarse gradations be evaluated. Within this research work, performance evaluation took place with the use of the Dynamic Modulus Test in Indirect Tension mode on coarsegraded mixtures consisting of field cores from 9 different pavements located in five districts of Minnesota. From each pavement’s surface layer, 3 specimens were tested at three temperatures; 0.4°C, 17.1°C, and 33.8°C each at nine ...


Rheological Changes In The Bitumen Caused By Heating And Interaction With Rubber During Asphalt–Rubber Production, Joana Peralta, Loic Hiliou, Hugo M.R.D. Silva, Ana V. Machado, R. Christopher Williams 2017 University of Minho

Rheological Changes In The Bitumen Caused By Heating And Interaction With Rubber During Asphalt–Rubber Production, Joana Peralta, Loic Hiliou, Hugo M.R.D. Silva, Ana V. Machado, R. Christopher Williams

R. Christopher Williams

The demand for more safe and durable roads, combined with the need to preserve the environment, led to the production and application of asphalt–rubber (AR) on roads. Nevertheless, this complex material needs further study in order to better distinguish among the phenomena that take place during AR production, as they impact on the final product characteristics. Here, we effectively quantify the rheological changes related to bitumen aging due to diffusion of small molecules of bitumen into the rubber particles and to the release of fillers from rubber into the bitumen during AR production. “A sphere AR production simulator” was ...


Development Of An Innovative Bio-Binder Using Asphalt-Rubber Technology, Joana Peralta, Hugo M.R.D. Silva, R. Christopher Williams, Marjorie Rover, Ana V.A. Machado 2017 Iowa State University

Development Of An Innovative Bio-Binder Using Asphalt-Rubber Technology, Joana Peralta, Hugo M.R.D. Silva, R. Christopher Williams, Marjorie Rover, Ana V.A. Machado

R. Christopher Williams

This research work evaluates several parameters that can affect Asphalt Rubber (AR) binder performance and applies the AR technology to the development of an innovative renewable bio-binder that can fully and cost-effectively replace asphaltic bitumen derived from petroleum in flexible pavement construction. The “Binder Accelerated Separator” method was used to divide the constituents of the Asphalt Rubber and bio-binder (residual binder and swelled rubber). The physical and chemical changes in the Asphalt Rubber and bio-binder and in the residual binders (residual bitumen and residual bio-oil) were evaluated. The results demonstrate that the produced bio-binder is suitable for use in flexible ...


Combining Asphalt T-Rubber (Ar) And Fast-Pyrolysis Bio-Oil To Create A Binder For Flexible Pavements, J. Peralta, R. Christopher Williams, H. M.R.D. Silva, A. V. Machado 2017 Iowa State University

Combining Asphalt T-Rubber (Ar) And Fast-Pyrolysis Bio-Oil To Create A Binder For Flexible Pavements, J. Peralta, R. Christopher Williams, H. M.R.D. Silva, A. V. Machado

R. Christopher Williams

The bio-oil from fast pyrolysis is mainly a product of the recycling of waste materials. This is a viscoelastic material, and after a heat treatment it has a viscosity similar to many types of asphalt used in the paving industry. Although bio-oil showed very good high temperature performance, the same was not verified at low temperatures. Therefore, GTR from cryogenic milling was used to modify the bio-oil. Then, a blend was produced by adding 20% (w/w) of this bio-binder to a PG 64-22 asphalt. The resulting binder was aged, and the storage stability test (separation sensibility) was performed. The ...


A Novel Concrete-Based Sensor For Detection Of Ice And Water On Roads And Bridges, Habib Tabatabai, Mohammed Aljuboori 2017 University of Wisconsin-Milwaukee

A Novel Concrete-Based Sensor For Detection Of Ice And Water On Roads And Bridges, Habib Tabatabai, Mohammed Aljuboori

Civil and Environmental Engineering Faculty Articles

Hundreds of people are killed or injured annually in the United States in accidents related to ice formation on roadways and bridge decks. In this paper, a novel embedded sensor system is proposed for the detection of black ice as well as wet, dry and frozen pavement conditions on roads, runways, and bridges. The proposed sensor works by detecting changes in electrical resistance between two sets of stainless steel poles embedded in the concrete sensor to assess surface and near-surface conditions. A preliminary decision algorithm is developed that utilizes sensor outputs indicating resistance changes and surface temperature. The sensor consists ...


Multi-Hazard Performance Assessment Of High-Rise Buildings, Jad El Khoury Antoun 2017 Louisiana State University

Multi-Hazard Performance Assessment Of High-Rise Buildings, Jad El Khoury Antoun

LSU Master's Theses

In the last few decades, there has been an important increase in building high-rise constructions in many cities around the world. Since they offer several benefits in populous areas in terms of space efficiency, economy and sustainability, tower buildings attracted practitioners and researchers to understand better their exclusive behavior and response to natural hazards (e.g., hurricanes, earthquakes). Because of their flexibility and their commonly limited damping, skyscrapers are more susceptible to wind and earthquake actions than low- and mid-rise buildings. Moreover, many locations are prone to multiple hazards; hence, it is important to understand thoroughly the structural behavior of ...


Investigation Of Ductile Crack Growth And Normalization Method For Se(T) Specimen Using Finite Element Analyses, Cheng Qian 2017 The University of Western Ontario

Investigation Of Ductile Crack Growth And Normalization Method For Se(T) Specimen Using Finite Element Analyses, Cheng Qian

Electronic Thesis and Dissertation Repository

The fracture toughness resistance curve (e.g. J-R curve) is widely used in integrity assessment and strain-based design of oil and gas pipelines with respect to planar defects (i.e. cracks). This thesis includes two-dimensional (2D) and three-dimensional (3D) finite element analyses (FEA) of ductile crack growth of X80-grade pipeline steel based on the Gurson-Tvergaard-Needleman (GTN) constitutive model, and investigation of the normalization (NM) method to generate the J-R curve for the single-edge tension (SE(T)) specimen.

First, the GTN model implemented in the computational cell is adopted in the commercial software ABAQUS to calibrate the micromechanical parameters for the ...


Enhancing Ductility Of One-Way Concrete Slabs Reinforced With Welded Wire Reinforcement, Mohamed K. Shwani 2017 Utah State University

Enhancing Ductility Of One-Way Concrete Slabs Reinforced With Welded Wire Reinforcement, Mohamed K. Shwani

All Graduate Theses and Dissertations

A series of research studies have recently identified an issue called strain localization in welded wire reinforced (WWR) members. This phenomenon reportedly concentrates strains at welded cross wire locations and severely limit ductility. Those that identified the phenomenon used it to imply that WWR is unsafe because it does not warn of failure. This dissertation is investigating details to mitigate the strain localization effect and demonstrate the WWR can be used safely. A moment curvature analysis is developed using Response2000 program and calibrated using experimental data. Parametric study was developed to present a recommendation of details and minimum reinforcement required ...


Automated Pin-Dot Marking Effects On A709-Gr50 Steel Plate Fatigue Capacity, Michael Andrew Noernberg 2017 University of Arkansas, Fayetteville

Automated Pin-Dot Marking Effects On A709-Gr50 Steel Plate Fatigue Capacity, Michael Andrew Noernberg

Theses and Dissertations

During fabrication of multi-piece steel bridge assemblies, markings are often made on the steel surface to identify/track individual pieces or to provide reference for fabrication layout or later erection. Automated marking methods such as computer numerically controlled (CNC) pin-dot marking offer fabrication efficiencies; however, for marked steel sections subjected to frequent or repeated loading (i.e. bridge girders) many code specifications require experimental testing to verify any marking effects on fatigue capacity. In this study, the effects of automated pin-dot markings on the fatigue capacity of A709-Gr50 bridge steel are experimentally investigated from 13 specimens considering 2 marking frequencies ...


Using Historic Pavement Performance Data To Identify And Select Sites For Asphalt Mixture Design Studies, Allyson Richey 2017 University of Arkansas, Fayetteville

Using Historic Pavement Performance Data To Identify And Select Sites For Asphalt Mixture Design Studies, Allyson Richey

Civil Engineering Undergraduate Honors Theses

Since 1997 Arkansas asphalt mixtures have been designed using a procedure commonly known as ‘Superpave’. In a traditional Superpave mix design, the design considers only traditional volumetric parameters; however, recent advances in mix design technology emphasize mixture’s ability to perform in its environment. There are numerous factors which affect the performance characteristics of an asphalt mix. Certainly, the asphalt binder’s performance is a critical variable in this system. Asphalt binders are sensitive to temperature, so much so that their primary parameter on which they are recommended is a function of both temperature and the geographic latitude in which ...


Systematic Review For Water Network Failure Models And Cases, Yufei Gao 2017 University of Arkansas, Fayetteville

Systematic Review For Water Network Failure Models And Cases, Yufei Gao

Theses and Dissertations

As estimated in the American Society of Civil Engineers 2017 report, in the United States, there are approximately 240,000 water main pipe breaks each year. To help estimate pipe breaks and maintenance frequency, a number of physically-based and statistically-based water main failure prediction models have been developed in the last 30 years. Precious review papers focused more on the evolution of failure models rather than modeling results. However, the modeling results of different models applied in case studies are worth reviewing as well.

In this review, we focus on research papers after Year 2008 and collect latest cases without ...


Partial Material Strength Reduction Factors For Aci 318, Tong Zhang 2017 The University of Western Ontario

Partial Material Strength Reduction Factors For Aci 318, Tong Zhang

Electronic Thesis and Dissertation Repository

The strength reduction factors, phi, defined in ACI 318-14 for different structural actions and elements lead to inconsistent results. This study proposes partial material strength reduction factors for concrete, phic, and reinforcing steel, phis, that yield similar design strengths and more consistent reliability indices. Three structural actions are investigated: moment; shear; and, combined moment and axial force. The first-order, second-moment method is used to compute reliability indices for moment and shear, and Monte Carlo simulation is used for combined moment and axial force. The statistical parameters assumed for the professional factor for shear strength significantly impact the reliability ...


Behaviour Of Pre-Stressed Concrete Transmission Poles Under High Intensity Wind, Ahmed M. Ibrahim 2017 The University of Western Ontario

Behaviour Of Pre-Stressed Concrete Transmission Poles Under High Intensity Wind, Ahmed M. Ibrahim

Electronic Thesis and Dissertation Repository

Among different types of electrical transmission line structures, pre-stressed concrete transmission poles have the advantages of low installation and maintenance costs, appropriate delivery time, and high corrosion resistivity. Typically, these poles are designed to resist synoptic wind loading. Current design codes do not consider the effect of high intensity wind (HIW) events in the form of downbursts and tornadoes on pre-stressed concrete poles despite the fact that those weather events are the main cause of failure of transmission line structures. The first comprehensive study conducted to assess the behaviour of pre-stressed concrete transmission poles under HIW is presented in this ...


Developing Rigid Airport Pavement Multiple-Slab Response Models For Top-Down Cracking Mode Using Artificial Neural Networks, Halil Ceylan, Orhan Kaya, Adel Rezaei Tarahomi, Kasthurirangan Gopalakrishnan, Sunghwan Kim, David R. Brill 2017 Iowa State University

Developing Rigid Airport Pavement Multiple-Slab Response Models For Top-Down Cracking Mode Using Artificial Neural Networks, Halil Ceylan, Orhan Kaya, Adel Rezaei Tarahomi, Kasthurirangan Gopalakrishnan, Sunghwan Kim, David R. Brill

Halil Ceylan

The Federal Aviation Administration (FAA) has recognized for some time that its current rigid 44 pavement design model, involving a single slab loaded at one edge by a single aircraft gear, is 45 inadequate to account for top-down cracking. Thus, one of the major observed failure modes for 46 rigid pavements is poorly represented in the FAA Rigid and Flexible Iterative Elastic Layer 47 Design (FAARFIELD) program. A research version of the FAARFIELD design software has 48 been developed (FAARFIELD 2.0), in which the single-slab three-dimensional finite element 49 (3D-FE) response model is replaced by a 4-slab 3D-FE model ...


Wireless Power Transfer Roadway Integration, Trevor Gardner 2017 Utah State University

Wireless Power Transfer Roadway Integration, Trevor Gardner

All Graduate Theses and Dissertations

Electric vehicles represent a major accomplishment in the energy and transportation industry. Unfortunately, they are restricted to a small travel range because of limited battery life. Successful integration of wireless power transfer (WPT) systems into the infrastructure would remove the range restrictions of EVs. To successfully integrate this technology, several requirements must be met. First, the embedment process cannot interfere with the electrical performance of the inductive power transfer (IPT) system. Second, the presence of the IPT system in the pavement structure cannot negatively affect the roadway’s lifespan.

Several systems were directly embedded in roadway materials. The electrical properties ...


The Girl Scout Climbing Wall Multidisciplinary Service-Learning Project, Margaret Pinnell, Corinne M. Daprano, Gabrielle Williamson 2017 University of Dayton

The Girl Scout Climbing Wall Multidisciplinary Service-Learning Project, Margaret Pinnell, Corinne M. Daprano, Gabrielle Williamson

Corinne M. Daprano

The Girl Scout Wall (GS Wall) project was implemented in two classes at the University of Dayton (UD): a Mechanical and Aerospace Engineering (MAE) course, and a Health and Sports Science (HSS) course, and Sport Facility Management. The MAE course, Introduction to Materials, is a three-credit, third-year required course where students learn about the basic structure and properties of materials as well as the principles of material selection. The Sport Facility Management course is a three-semester hour, required HSS course where students are introduced to the processes of planning, constructing, equipping, maintaining, and managing sport facilities.


Footprintid: Indoor Pedestrian Identification Through Ambient Structural Vibration Sensing, Shijia Pan, Tong Yu, Mostafa Mirshekari, Jonathon Fagert, Amelie Bonde, Ole J. Mengshoel, Hae Young Noh, Pei Zhang 2017 Carnegie Mellon University

Footprintid: Indoor Pedestrian Identification Through Ambient Structural Vibration Sensing, Shijia Pan, Tong Yu, Mostafa Mirshekari, Jonathon Fagert, Amelie Bonde, Ole J. Mengshoel, Hae Young Noh, Pei Zhang

Ole J Mengshoel

We present FootprintID, an indoor pedestrian identification system that utilizes footstep-induced structural vibration to infer pedestrian identities for enabling various smart building applications. Previous studies have explored other sensing methods, including vision-, RF-, mobile-, and acoustic-based methods. They often require specific sensing conditions, including line-of-sight, high sensor density, and carrying wearable devices. Vibration-based methods, on the other hand, provide easy-to-install sparse sensing and utilize gait to distinguish different individuals. However, the challenge for these methods is that the signals are sensitive to the gait variations caused by different walking speeds and the floor variations caused by structural heterogeneity.

We present ...


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