Details:

Creators:
Shuler, Scott
Corporate Creators:
Colorado State University. Dept. of Construction Management
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Asphalt Pavements Best Practices Crumb Rubber Feasibility Analysis Pavement Performance Surface Course (Pavements) Test Sections Tires
Publication/ Report Number:
CDOT-2014-12
Resource Type:
Tech Report
Geographical Coverage:
Colorado
Corporate Publisher:
Colorado. Dept. of Transportation. Applied Research and Innovation Branch
Abstract:
The objective of this study was to determine the feasibility of using waste tires (crumb rubber) in the

construction of asphalt pavements in Colorado. Two pilot test sections and one control section were constructed

and observed over a five-year period to meet this objective. The two pilot test sections were built using two

crumb rubber modified (CRM) asphalt processes. One process uses ground tire rubber (GTR) blended with hot

asphalt cement at the asphalt plant to form the hot mix asphalt. This is referred to as the Wet Process. The other

process blends GTR and asphalt cement at a remote blending facility and is then transported to the hot mix plant

to produce the hot mix asphalt. This process is the Terminal Blend method. In addition, a control section was

constructed containing a conventional binder. Binders in the two test sections containing GTR and the control

section met the specifications for PG 64-28 asphalt. Each of the three test sections contains approximately 1,000

tons of 2-inch asphalt overlay placed over a cold-milled surface in the eastbound driving lane of US 34 Bypass

near Greeley, CO. Construction of the test and control sections occurred in the summer of 2009.

The goal of this research project is to evaluate the performance of the crumb rubber test sections compared with

the conventional control section and depending on performance, develop Colorado-specific materials and

construction specifications for ground tire modified asphalt pavements. Also, the research project aims to

develop guidelines and best management practices for the construction of ground tire modified asphalt

pavements. Transverse cracking began in the rubber modified sections after 22 months of service and

longitudinal cracking began after 29 months. The control sections have no transverse cracking to date with

longitudinal cracking beginning to appear after 56 months.


Format:
PDF
Funding:
34.24
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:dfbe456292135be4448a24f7dce47826e65b05238701e95066a0cb7a6da1c545
Download URL:
https://rosap.ntl.bts.gov/view/dot/29109/dot_29109_DS1.pdf
File Type:

Supporting Files

• No Additional Files

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