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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

Overview

 

Research and Development (R&D) Project Sites

Project Information
Project ID:   FHWA-PROJ-08-0015
Project Name:   Extending the Season for Concrete Construction and Repair
Project Status:   Completed
Start Date:  August 8, 2008
End Date:  February 28, 2014
Contact Information
Last Name:  Faridazar
First Name:  Fred
Telephone:  202-493-3076
E-mail:  fred.faridazar@dot.gov
Office:   Office of Infrastructure Research and Development
Team:   Pavement Design and Construction Team [HRDI-20]
Project detail
Roadmap/Focus area(s):   Congestion
Project Description:   Innovative concrete mixtures are currently under development, entitled "Extending Construction Season, for Concreting Applications under Cold Weather Conditions." This is a pool fund project and consists of three phases: Phase I demonstrated the practicality of antifreeze admixtures for concrete and delivered the tools to design, mix, place, and cure concrete in below-freezing weather (supported by 10 northern States, completed in October 2003). Phase II defined the effect of phase I antifreeze formation on the freeze-thaw durability of concrete (supported by 10 northern States, completed May 1, 2006). Phase III will be conducted in fiscal year 2008; the objective is to develop guidance for designing admixture dosages for concrete to allow one to design a full range of admixture dosages to fit the typically varying weather conditions experienced by any job location. The primary objective of this proposed effort is to develop a new version of high-performance paving software that uses calorimetry information and reports the temperature development and concrete strength gain for use in cold weather concrete paving applications. It would also include a feature to download weather data from the National Weather Service Web site automatically. The modified version of high-performance paving will be tested under laboratory-controlled conditions to properly validate the high-performance paving predictions in cold weather against field data. Modifying high-performance paving to report the temperature development in the concrete would allow users to evaluate the temperature curing regime for these concrete mixtures under cold weather conditions and thus evaluate strength gain. It is anticipated that in addition to calorimetry testing, additional thermal properties of the concrete materials will be required for an accurate concrete temperature prediction (such as thermal conductivity and specific heat, which are currently hard coded in high-performance paving for ease of use). It is proposed to include these thermal properties as advanced inputs in the research grade version of the high-performance paving software.
Goals:   Construction and material quality innovation.
Product Type:   Research report
Test Methodology:   Analytical modeling, concrete materials, controlled laboratory testing and filed application
Expected Benefits:   Highway agencies will be able to use the new version of high-performance paving to predict with greater accuracy the concrete temperature and strength gain under cold weather conditions. It is the intent to show how these concrete mixtures accelerate the hydration reactions, and thus achieve the required strength. The use of these concrete mixtures is of particular benefit during late season placement, and placement in cold environments where freezing temperatures may slow down the concrete strength gain, delay setting time, and even damage the concrete structure if a compressive strength of at least 500 psi is not achieved before exposure to a freezing cycle.
Deliverables: Name: Innovative concrete mixtures are currently under development, entitled Extending Construction Season, for Concreting Applications under Cold Weather Conditions. This is a pool fund project and consists of three phases: Phase I demonstrated the practicality of antifreeze admixtures for concrete and delivered the tools to design, mix, place, and cure concrete in below-freezing weather (supported by 10 northern States, completed in October 2003). Phase II defined the effect of Phase I antifreeze formation on the freeze-thaw durability of concrete (supported by 10 northern States, the project was completed in May 1, 2006). Phase III will be conducted in fiscal year 2008; the objective is to develop guidance for designing admixture dosages for concrete to allow one to design a full range of admixture dosages to fit the typically varying weather conditions experienced by any job location. The primary objective of this proposed effort is to develop a new version of high performance paving software that uses calorimetry information and reports the temperature development and concrete strength gain for use in cold weather concrete paving applications. It would also include a feature to download weather data automatically from the National Weather Service Web site. The modified version of high performance paving will be tested under laboratory-controlled conditions to properly validate the high performance paving predictions in cold weather against field data. Modifying high performance paving to report the temperature development in the concrete would allow users to evaluate the temperature curing regime for these concrete mixtures under cold weather conditions and thus evaluate strength gain. It is anticipated that in addition to calorimetry testing, additional thermal properties of the concrete materials will be required for an accurate concrete temperature prediction (such as thermal conductivity and specific heat, which are currently hard-coded in high performance paving for ease of use). It is proposed to include these thermal properties as advanced inputs in the research grade version of the high performance paving software.
Product Type(s): Research report
Description: The deliverable is a user guide that includes a series of design tables describing admixture dosages to be adjusted for a specific level of protection for concrete placement in a cold weather environment.
FHWA Topics:   Roads and Bridges--Pavement and Materials
TRT Terms:   Concrete
Infrastructure
Pavements
Research
Materials
Construction
FHWA Disciplines:   Design
Subject Areas:   Construction
Design
Maintenance and Preservation
Pavements

 

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