Repair Materials
Project Information
Project Abstract:
Premature failure of concrete repair materials has been repetitively listed as one of the state highway agencies’ (SHA) major concerns over the past few years at the National Concrete Consortium. Repair materials are typically selected based on their ability to set and develop mechanical properties (compressive and flexural strengths) in a short period time to minimize the necessary closure time of the in-service infrastructure to the public.
Due to these accelerated opening times, cementitious and accelerating admixtures contents for high-early strength concretes are increased significantly for repair materials mixture designs in comparison to concrete mixtures for other applications. The increased cementitious contents often lead to premature shrinkage and durability problems within repair materials, requiring replacement of the repairs within a few years after their initial placement.
This project assesses testing and durability of high-early strength concrete materials. Performance-engineered mixture design concepts described in AASHTO R 101 are applied to high-early strength concrete mixtures in effort to improve repair materials durability. Electrical-based durability tests and shrinkage testing are a significant component of AASHTO R 101. The effects of accelerating admixtures on electrical-based durability tests play a significant role in the ability to test and assess high-early strength materials. This influence of accelerating admixtures as well as shrinkage assessment were performed on high-early strength materials. Additionally, with the increasing use of portland limestone cements and reduced production of ordinary portland cements, the implications of using portland limestone cements in high-early strength concrete was investigated.
Project Status:
Active
Project Funding Amount (Contract Award Amount):
$300,000.00
Start Date:
End Date:
Public Access Plan:
Yes
Laboratory:
Grant/Contract ID:
- 693JJ323D000008
Project Outputs:
Documents on the influence of accelerating admixtures on electrical resistivity, using AASHTO R 101 concepts to improve high-early strength concrete mixture designs and consequently performance, shrinkage of high-early strength concretes, and the impact of changing ordinary portland cement in high-early strength concretes for portland limestone cement.
Project Outcomes/Impact:
Documents on the influence of accelerating admixtures on electrical resistivity, using AASHTO R 101 concepts to improve high-early strength concrete mixture designs and consequently performance, shrinkage of high-early strength concretes, and the impact of changing ordinary portland cement in high-early strength concretes for portland limestone cement.
AMRP = Annual Modal Research Plan
Contact Information
First Name:
Michelle
Middle Initial:
A.
Last Name:
Cooper
Phone Number:
202-493-3691
Email Address:
Team:
Infrastructure Materials Team
Office:
Office of Infrastructure Research and Development
Office Code:
HRDI-10
Management Organizations
Sponsor Organization
Organization Role:
Sponsor Organization
Organization:
Federal Highway Administration: Office of Research, Development, and Technology - Office of Infrastructure Research and Development
Contact Role:
Contract Office Representative
Contact:
Managing Organization
Organization Role:
Sponsor Organization
Organization:
Federal Highway Administration: Office of Research, Development, and Technology - Office of Infrastructure Research and Development
Contact Role:
Contract Office Representative
Contact:
Deliverables
Links to Project Reports: