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Experimental Study On Local Bond Stress-Slip Relationship In Self-Compacting Concrete, Marian Sabau, Ioan Pop, Traian Onet 2016 Universidad de la Costa

Experimental Study On Local Bond Stress-Slip Relationship In Self-Compacting Concrete, Marian Sabau, Ioan Pop, Traian Onet

Marian Sabau

This paper summarizes the results of an experimental study on local bond stress-slip relationship of deformed reinforcing bars embedded in self-compacting concrete, considering the effect of concrete confinement by transverse reinforcement. In this study were cast 104 specimens by using self-compacting concrete and vibrated concrete. Pull-out tests were performed on deformed bars with short anchorage length (ld ≤ 5∅). The parameters analyzed were the concrete type, the confining reinforcement, the bar diameter and the anchorage length of bar. The results of this study showed that the ultimate bond strength was higher for self-compacting concrete compared to vibrated concrete, and the slip ...


Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. LaBoube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll 2016 Missouri University of Science and Technology

Rubble Pile Characterization Model, William P. Schonberg, Jason Baird, Paul Nicholas Worsey, Abdeldjelil Belarbi, Roger A. Laboube, Braden Lusk, R. Flanagan, H. Burleson, Robert S. Woodley, Warren Noll

Paul Worsey

Rubble piles created following the collapse of a building in a combat situation can significantly impact mission accomplishment, particularly in the area of movement and maneuver. Rubble characteristics must be known, for example, in order to predict the ability of a vehicle to override the collateral damage from weapon effects in urban areas. Two types of models are developed: a first-order model and a first-principles-based model. In both models, we assume complete rubblization of the building and develop a rubble profile model using the size and composition of the collapsed structure to predict the rubble volume. In both cases, this ...


Estimation Of Earthquake Loss Due To Bridge Damage In The St. Louis Metropolitan Area. Ii: Indirect Losses, David Lee Enke, Chakkaphan Tirasirichai, Ronaldo Luna 2016 Missouri University of Science and Technology

Estimation Of Earthquake Loss Due To Bridge Damage In The St. Louis Metropolitan Area. Ii: Indirect Losses, David Lee Enke, Chakkaphan Tirasirichai, Ronaldo Luna

David Enke

An approach to estimate the indirect economic loss due to damaged bridges within the highway system from an earthquake event is presented. The indirect cost considered refers to the increased highway transportation cost only. The study zone covers the St. Louis metropolitan area and its surrounding suburban regions. An earthquake scenario centered in St. Louis, with a magnitude 7.0 is used. The direct earthquake loss was primarily damage to bridges, which causes an increase in travel time and distance within the transportation network. This information is then used as input for the indirect loss model. The indirect loss is ...


Automated Control Flaw Generation Procedure: Cheakamus Dam Case Study, Bogdan Pavlovic 2016 The University of Western Ontario

Automated Control Flaw Generation Procedure: Cheakamus Dam Case Study, Bogdan Pavlovic

Electronic Thesis and Dissertation Repository

This thesis deals with the problem of aging hydropower infrastructure systems and system components, a problem that is very common across Canada. Flaws of common risk analysis methods are noted, and the need for new risk analysis approaches is identified. System dynamics simulation method is introduced as an implementation mechanism for the System Theoretic Process Analysis (STPA). STPA and its adaptation to complex hydropower systems are explained thoroughly. Fuzzy logic is used to model operator’s decision making. The main objectives of the research include the development of an automated generic approach that implements STPA and fuzzy logic for the ...


A Framework To Utilize Shear Strength Properties For Evaluating Rutting Potentials Of Unbound Aggregate Materials, Issam Qamhia, Erol Tutumluer, Liang Chern Chow, Debakanta Mishra 2016 University of Illinois at Urbana-Champaign

A Framework To Utilize Shear Strength Properties For Evaluating Rutting Potentials Of Unbound Aggregate Materials, Issam Qamhia, Erol Tutumluer, Liang Chern Chow, Debakanta Mishra

Debakanta Mishra

This paper presents shear strength and permanent deformation trends of four unbound aggregate materials, commonly used for base and subbase layers in the state of North Carolina, USA, studied through repeated load triaxial testing, using the University of Illinois FastCell equipment. A testing and modeling framework has been established to develop a proper permanent deformation prediction model, referred to herein as the UIUC rutting model, with number of load applications. According to the framework, the unbound aggregate shear strength properties are incorporated into the model using the ratio of the applied wheel load shear stress to the mobilized shear strength ...


Evaluating Remotely Sensed Images For Use In Inventorying Roadway Infrastructure Features, Shauna L. Hallmark, David Alexander Veneziano, Kamesh mantravadi, Reginald R. Souleyrette 2016 Iowa State University

Evaluating Remotely Sensed Images For Use In Inventorying Roadway Infrastructure Features, Shauna L. Hallmark, David Alexander Veneziano, Kamesh Mantravadi, Reginald R. Souleyrette

Reginald R. Souleyrette

The main objective of this research was to evaluate the use of remotely sensed images as a method to facilitate accurate and rapid collection of large quantities of inventory data. Images collected from either an airplane or satellite can be collected fairly rapidly for large areas without locating on-road or interfering with traffic. With the launching of the IKONOS satellite, resolutions of 1 meter can be practically obtained from space. Image resolution of as high as 1-inch are possible with aerial photography. Aircraft can be flown at higher altitudes for lower resolutions. Since cost typically decreases as resolution decreases, one ...


Biologically Important Thiols In Various Vegetables And Fruits, Nuran Ercal, Craig D. Adams, Omca Demirkol 2016 Missouri University of Science and Technology

Biologically Important Thiols In Various Vegetables And Fruits, Nuran Ercal, Craig D. Adams, Omca Demirkol

Nuran Ercal

Biological thiols are important antioxidants, and recent studies showed that their contents vary depending on the groups of foodstuffs. Therefore, we investigated the levels of some biological thiols in various vegetables and fruits by using a sensitive high-performance liquid chromatography (HPLC) technique. Biological thiols measured in some vegetables and fruits include glutathione (L-glutamyl-L-cysteinly glycine, GSH), N-acetylcysteine (NAC), captopril [CAP (C9H15NO3S)], homocysteine (HCYS), cysteine (CYS), and -glutamyl cysteine (GGC). Our results show that biological thiol contents are between 3-349 nM/g wet weight in vegetables and 4-136 nM/g wet weight in fruits. CAP is only found in asparagus (28 nM ...


Concrete Surface With Nano-Particle Additives For Improved Wearing Resistance To Increasing Truck Traffic, Genda Chen Ph.D., P.E., F.ASCE, Dongming Yan Ph.D., Chenglin Wu Ph.D., Nicholas Leventis Ph.D, Shruti Mahadik Ph.D., Zhibin Lin Ph.D 2016 Missouri University of Science and Technology

Concrete Surface With Nano-Particle Additives For Improved Wearing Resistance To Increasing Truck Traffic, Genda Chen Ph.D., P.E., F.Asce, Dongming Yan Ph.D., Chenglin Wu Ph.D., Nicholas Leventis Ph.D, Shruti Mahadik Ph.D., Zhibin Lin Ph.D

Nicholas Leventis

This study focused on the use of nanotechnology in concrete to improve the wearing resistance of concrete. The nano materials used were polymer cross-linked aerogels, carbon nanotubes, and nano-SiO2, nano-CaCO3, and nano-Al2O3 particles. As an indirect measurement of the concrete wearing resistance, the tensile and compressive properties and the permeability of concrete were evaluated for various mix designs. The optimal amount of nano material additives were determined following the American Society of Testing Methods (ASTM) standard test methodologies. The test results from the materials were compared for their mechanical behaviors. This type of technology may potentially improve the comfort level ...


Safety Edge Crash Modification Factors, Shauna L. Hallmark, Amrita Goswamy, Michael David Pawlovich 2016 Iowa State University

Safety Edge Crash Modification Factors, Shauna L. Hallmark, Amrita Goswamy, Michael David Pawlovich

Tech Transfer Summaries

This study evaluated the safety impact of the Safety Edge for construction projects in 2010 and 2011 in Iowa to assess the effectiveness of the treatment in reducing crashes.


Numerical Simulation Of Prestressed Precast Concrete Bridge Deck Panels Using Damage Plasticity Model, Wei Ren, Lesley Sneed, Yang Yang, Ruili He 2016 Missouri University of Science and Technology

Numerical Simulation Of Prestressed Precast Concrete Bridge Deck Panels Using Damage Plasticity Model, Wei Ren, Lesley Sneed, Yang Yang, Ruili He

Lesley Sneed, Ph.D., P.E.

No abstract provided.


Modot Pavement Preservation Research Program, David Newton Richardson, Neil Lennart Anderson, Andrew Z. Boeckmann, Ronaldo Luna, S. Michael Lusher, Brent Rosenblad, Lesley Sneed 2016 Missouri University of Science and Technology

Modot Pavement Preservation Research Program, David Newton Richardson, Neil Lennart Anderson, Andrew Z. Boeckmann, Ronaldo Luna, S. Michael Lusher, Brent Rosenblad, Lesley Sneed

Lesley Sneed, Ph.D., P.E.

The following report documents a research project on pavement preservation performed by the Missouri University of Science and Technology (Missouri S&T) and the University of Missouri-Columbia (UMC) on behalf of the Missouri Department of Transportation (MoDOT). the report consists of a Summary Report followed by six detailed technical reports. to achieve the goal of reducing maintenance costs and improving minor road ratings, MoDOT has embarked upon a plan of formalizing its maintenance/preservation planning. to assist in developing the plan, MoDOT contracted with the Missouri S&T and UMC to conduct a research project, entitled “MoDOT Pavement Preservation Research ...


The Guayule Plant: A Renewable, Domestic Source Of Binder Materials For Flexible Pavement Mixtures, David Newton Richardson, Steven Michael Lusher 2016 Missouri University of Science and Technology

The Guayule Plant: A Renewable, Domestic Source Of Binder Materials For Flexible Pavement Mixtures, David Newton Richardson, Steven Michael Lusher

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

Due to the rising price of crude oil, flexible pavement costs have increased significantly. This price pressure has resulted in the increased use of reclaimed asphalt pavement (RAP) and/or reclaimed asphalt roofing shingles (RAS) because of the binder (asphalt cement) they contain. This has increased demand for recycling (rejuvenating) agents which return the RAP/RAS binders to their original state by 1) restoring maltenes (petroleum oils and resins) that have been depleted due to age-hardening/oxidation, and 2) reducing their viscosity. The project concept was to design a flexible pavement mixture (FPM) produced with little-to-no virgin petroleumbased binder which ...


Systems Approach For Estimating Field Moisture Content, Thomas M. Petry, Yuh-Puu Han, David Newton Richardson 2016 Missouri University of Science and Technology

Systems Approach For Estimating Field Moisture Content, Thomas M. Petry, Yuh-Puu Han, David Newton Richardson

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

This paper describes a software tool developed for estimation of the field moisture content of subgrade materials. Subgrade behavior is directly related to its moisture content. Unfortunately, some approaches of estimating field moisture content are too complex to be used in routine design. In this paper, the authors attempt to provide an approach that is easy to use. The software presented here was developed using expert system approaches. It is capable of analyzing data entered by the users, and providing estimations to meet different scenarios. The information entered by the user is first examined for its reasonableness and accuracy. Then ...


Strength And Durability Characteristics Of A 70% Ground Granulated Blast Furnace Slag (Ggbfs) Concrete Mix, David Newton Richardson 2016 Missouri University of Science and Technology

Strength And Durability Characteristics Of A 70% Ground Granulated Blast Furnace Slag (Ggbfs) Concrete Mix, David Newton Richardson

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

For a bridge pier and abutment mass concrete project, three mixes were studied: an ordinary portland cement (OPC) mix (Type I PC) and two 70% by weight ground granulated blast furnace slag (GGBFS) mixes (Type II Low Heat PC). One of the slag mixes contained a high range water reducer (HRWR). Tests for compressive strength, freezethaw durability, rapid chloride permeability, and salt scaling were conducted on field samples. Results showed that the strengths of the slag mixes were lower than the OPC mix at all ages up to one year, although the use of HRWR did improve the strength somewhat ...


Making Concrete Less Abstract, David Newton Richardson 2016 Missouri University of Science and Technology

Making Concrete Less Abstract, David Newton Richardson

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

CE 3 13 is a second level properties of concrete lecture course. In an effort to make it appear less abstract to the students, over the course of several semesters several learning strategies were tried, including journaling, muddiest point, entering the academy, role playing, bookends-on-a-lecture, and hands-on lab projects. Most recently, an emphasis on short writing-to-learn papers, a problems-based stance, and an integrated lab project was used. Student evaluations indicated that the lab projects and the increased writing was of significant benefit in promotion of learning.


Quick Test For Durability Factor Estimation, David Newton Richardson 2016 Missouri University of Science and Technology

Quick Test For Durability Factor Estimation, David Newton Richardson

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

The Missouri Department of Transportation (MoDOT) is considering the use of the AASHTO T 161 Durability Factor (DF) as an end-result performance specification criterion for evaluation of paving concrete. However, the test method duration can exceed 75 days before results are known. MoDOT contracted with the Missouri University of Science and Technology (Missouri S&T) to develop a method of approximation of DF based primarily on aggregate testing that would be of a shorter duration. Nineteen different ledge samples representing 18 ledges, 10 geologic formations (nine limestone and one dolomite) were sampled by MoDOT and delivered to Missouri S&T ...


Modot Pavement Preservation Research Program, David Newton Richardson, Neil Lennart Anderson, Andrew Z. Boeckmann, Ronaldo Luna, S. Michael Lusher, Brent Rosenblad, Lesley Sneed 2016 Missouri University of Science and Technology

Modot Pavement Preservation Research Program, David Newton Richardson, Neil Lennart Anderson, Andrew Z. Boeckmann, Ronaldo Luna, S. Michael Lusher, Brent Rosenblad, Lesley Sneed

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

The following report documents a research project on pavement preservation performed by the Missouri University of Science and Technology (Missouri S&T) and the University of Missouri-Columbia (UMC) on behalf of the Missouri Department of Transportation (MoDOT). the report consists of a Summary Report followed by six detailed technical reports. to achieve the goal of reducing maintenance costs and improving minor road ratings, MoDOT has embarked upon a plan of formalizing its maintenance/preservation planning. to assist in developing the plan, MoDOT contracted with the Missouri S&T and UMC to conduct a research project, entitled “MoDOT Pavement Preservation Research ...


Resilient Moduli Of Typical Missouri Soils And Unbound Granular Base Materials, David Newton Richardson, Thomas M. Petry, Yu-Ning Louis Ge, Y. P. Han, S. M. Lusher 2016 Missouri University of Science and Technology

Resilient Moduli Of Typical Missouri Soils And Unbound Granular Base Materials, David Newton Richardson, Thomas M. Petry, Yu-Ning Louis Ge, Y. P. Han, S. M. Lusher

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

The objective of this project is to accurately determine the resilient moduli for common Missouri subgrade soils and unbound granular base materials in accordance with the AASHTO T 307 test method. The test results included moduli data from 27 common subgrade soils out of the 99 Missouri soil associations and from 5 unbound granular bases. These materials were tested at their optimum water content and at an elevated water content, which would normally occur as a worse case scenario during the life of a pavement. The five unbound granular base materials were tested at two different gradations (high and low ...


Relative Durability Of Shale -- A Suggested Rating System, David Newton Richardson 2016 Missouri University of Science and Technology

Relative Durability Of Shale -- A Suggested Rating System, David Newton Richardson

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

The inability to predict the degradation tendencies of shale has resulted in numerous failures of projects where shale was used as a construction material. Because shale does not fit neatly into either a soil category or a rock category, the tests that are commonly used to classify soil or rock are in many instances not totally suitable for classifying shale as to its long-term behavior properties. Thus, special classification tests of shale types has become necessary. The durability or shale relates to how well it can withstand its changing environment and still retain its initial properties. Strength, expansion characteristics, and ...


Quick Test For Percent Of Deleterious Material, David Newton Richardson 2016 Missouri University of Science and Technology

Quick Test For Percent Of Deleterious Material, David Newton Richardson

David N. Richardson, Ph.D., P.E., F.ACI (Emeritus)

The Missouri Department of Transportation (MoDOT) is considering the replacement of its deleterious materials test method (TM-71) with test methods that are more objective. MoDOT contracted with the Missouri University of Science and Technology (Missouri S&T) to develop a system of test methods. Nine quarry/ledge samples representing seven geologic formations (four limestones and three dolomites) were supplied by MoDOT. The ledge samples represented three aggregates each for use in concrete, asphalt, and granular base. Samples with controlled contamination were also tested, bringing the total to 18. The aggregates were subjected to fifteen test methods. This data, coupled with ...


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