Friday 3:10 PM- 3:40 PM
Friday 3:40 PM- 4:10 PM
Friday 4:10 PM- 5:40 PM
ABC 19-096: Environmental and Sustainability Benefits of Substructure Re-Use Projects
ABC 19-097: Spun Pipe Piles – A Time Saving Alternative to Micropiles
ABC 19-098: Enhanced Demolition Prediction via Computer Simulation
Accelerated Bridge Construction projects where existing substructure components are re-used can reduce direct cost, shorten construction time and reduce traffic congestion. Substructure re-use can also provide quantifiable environmental benefits including; conservation of raw materials, reduction in the generation of demolition waste and the resulting need for landfill, and the protection of sensitive habitat and existing ecosystems. As a result of these direct and indirect benefits, substructure re-use in ABC projects is a sustainable practice and should be encouraged. The presentation will discuss the environmental impact of the construction industry and how these impacts can be substantially reduced through the re-use of substructure elements.
The Maine Department of Transportation successfully replaced the Weskeag River Bridge utilizing Accelerated Bridge Construction. The main challenge for the project was finding a foundation type that was suitable to both the site constraints and roadway closure window, as well as offering reduced risk. This project was only the second use of spun pipe piles on a bridge project in Maine. The author will discuss how spun pipe piles retain many of the advantages of micro-piles, how they were the best solution for the shallow bedrock conditions and underground obstructions and how they are compatible with integral and semi-integral abutments.
19-101 Mechanical Reinforcing Steel Connections for Improved Constructability in Accelerated Bridge Construction *Manuel Conde-nvent Dan Reider-nvent
Mechanical reinforcing steel (rebar) connections are a safe and reliable way of splicing and anchoring rebar that improve constructability in all types of reinforced concrete construction, and are especially beneficial for Accelerated Bridge Construction (ABC) applications. These connections can accelerate erection of precast members and ease rebar placement and congestion in closure pours, as well as enhance concrete consolidation. With many different connections to cover various applications, mechanical rebar connections provide enhanced constructability and flexibility options to designers and precasters involved with ABC projects.
ABC 19-106: Rapid Set Concrete Bridge Deck Overlays Edward Liberati, Hydro-Technologies / Modified Concrete Suppliers
Accelerated, Long Term Structural Bridge Deck Repairs can be achieved using Very Early Strength Latex Modified Concrete Overlays. In 2018 we were involved with projects at many states where Fast Track Hydrodemolition and VESLMC was used to repair and preserve these bridge decks for 25 additional years of service life, since the 1960’s. This work was performed during weekend only or during restricted overnight lane closures. After placement, the VESLMC is ready for traffic in just 3 hours. VESLMC is an amazing hydraulic concrete material that is designed to withstand the harsh environments that bridge decks are subjected to.
*Theresa McAuliffe, Thomas Kendrick – McFarland Johnson, Inc.
ABC 19-102: Development of a Low-Logistics, Rapidly Deployable Hybrid CompositeConcrete Bridge Girder System
*Anthony Diba, Habib Dagher, Bill Davids – University of Maine This research was focused on the design of a lightweight, durable FRP bridge girder with a composite concrete slab for rapid bridge construction. A forty-foot span four-girder bridge was used as a design example. Experimental work was carried out to characterize the shear connection’s stiffness and strength as well as performance of the shear studs and the FRP-concrete interface. Additionally, a full-scale forty-foot girder specimen was tested to verify design assumptions. A pilot project has been identified by the Maine DOT for construction in 2019 where the girder system will be used for a seventy-five-foot bridge.
ABC 19-107: Durability of GFRP Bars in Bridges with 15 to 20 Years in Service
*Vanessa Benzecry , Antonio Nanni – University of Miami; Douglas Gremel, Owens Corning Infrastructure Solutions In order to validate performance of glass fiber reinforced polymer (GFRP), their durability is investigated in rebars of eleven bridges with 15 to 20 years in service. The bridges investigated are exposed to wet and dry cycles, freeze-thaw cycles and deicing salts. The results of these tests were compared to collected data of pristine bars at the time of installation or to current standards when collected data was not available. The SEM and EDS results showed minimal physical damage (0.05 to 0.12%) and minimal elemental distribution changes in some bridges. This study provides positive indication on the long-term durability of GFRP bars.
*Ali Bakhtiari, Seung Lee – Department of Civil & Environmental Engineering, Florida International University, Miami, FL
FRIDAY AFTERNOON
David Whitmore, Vector Corrosion Technologies Ltd.
*-denotes speaker
While maintaining the integrity of the neighboring infrastructure and safety of workers are of high importance during the demolition process, detailed guidelines or specifications are not available for engineers and contractors for a proactive demolition planning. This study aims to enhance the predictive capabilities by developing a numerical simulation framework that can be useful for the engineers and contractors to realistically model, simulate and visualize the bridge demolition. this project considers the impulse-based simulation framework that employs a reduced 1st order dynamics to realistically present larger scale discrete bodies’ interactions with almost two orders of speed-up while still maintaining the simulation fidelity.
ABC 19-103: Lightweight Modular Accelerated Bridge System for Managed Car Lanes Saurabh Mittal, Horner & Shifrin
There is a widening infrastructure investment gap in a large number of countries. Aging infrastructure requires high maintenance. On the other hand, severe congestion on important urban interstate corridors is leading to prohibitive economic costs. This paper proposes use of managed car lanes to relieve pressure on existing infrastructure by giving policy planners a tool to effectively augment and manage existing Bridge infrastructure network. The paper combines Metal Grid Deck systems with Simple for Dead Load and Continuous for Live Load approach to create a rapidly scalable installation system for Highway Bridges especially for managed car lanes.
ABC 19-108: Practical Guidance for Designing Lightweight Concrete Bridges – The FHWA Lightweight Concrete Design Primer *Reid Castrodale, Castrodale Engineering Consultants, PC; Dr. Andrew Foden, WSP
Lightweight concrete has the obvious benefit of reducing the weight of large precast elements often used for ABC projects. This can save project costs by reducing the equipment requirements for handling, transporting and erecting the elements. However, many engineers are reluctant to use lightweight concrete in their bridge designs because they are not familiar with the material and how to use it. This paper introduces a Lightweight Concrete Design Primer that is being developed for FHWA to address these issues by gathering the information needed for design of lightweight concrete bridges into a single concise document.
2019 CONFERENCE PROGRAM 41