United States Department of Transportation
ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners.
As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.
i
0-7074: Increase the Allowable Content of Recycled Crushed Concrete Aggregate in Class P Concrete
-
2023-08-31
[PDF-299.35 KB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Resource Type:
-
Geographical Coverage:
-
Edition:Project Summary Report
-
Contracting Officer:
-
Corporate Publisher:
-
Abstract:Over 140 million tons of recycled concrete aggregate (RCA) are produced in the United States per year (ACPA, 2009), and this material has been used in a host of transportation infrastructure applications, including fills, embankments, bases, subbases, and concrete pavements. Currently, TxDOT limits the maximum amount of recycled crushed concrete fine aggregate (RCFA) allowed in Class P paving concrete to 20% (by mass replacement of virgin sand). The goal of this project was to evaluate the key technical and construction-related issues that potentially limit the RCFA content in new concrete pavements, and based on laboratory and field evaluations, provide recommendations on maximum RCFA contents. These objectives were accomplished through a thorough review of literature and current practice, conducting a comprehensive laboratory investigation, and constructing and monitoring new pavement sections containing up to 70 percent RCFA. The successful use of recycled concrete aggregate (RCA) in continuously reinforced concrete pavement (CRCP) in a field trial near Sealy, TX under this project demonstrated the potential for increasing the sustainability of concrete paving while still achieving target performance. Based on the findings from this project, it is recommended that TxDOT increase the allowable RCFA content to 70 percent. More work is needed to see if even higher RCFA contents are technically and practically feasible, and more monitored field trials are recommended to evaluate a much more widespread use of RCFAs in implementation project(s).
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
