Details:

Creators:
Durham, Stephan A. ; Cavaliero, Robert W.
Durham, Stephan A. ; Cavaliero, Robert W. Less -
Corporate Creators:
University of Colorado at Denver. Department of Civil Engineering
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Bridges--Colorado--Floors--Testing Concrete Pavements Cracking Cracking Of Concrete Pavements Pavement Cracking Pavement Maintenance Pavements, Concrete--Colorado--Testing Testing
Publication/ Report Number:
CDOT-2010-5
Resource Type:
Tech Report
Geographical Coverage:
Colorado
Edition:
Final.
Corporate Publisher:
Colorado. DTD Applied Research and Innovation Branch
Abstract:
This study examined the performance of concrete mixtures designed to increase cracking resistance for Colorado bridge decks. The

current CDOT Class H and HT concrete mixtures and nine other mixtures were investigated to aid in the development of a more crack

resistant concrete specification. A total of eleven concrete mixtures were designed, batched, and tested for their fresh and hardened

concrete performance. Specifically, the designs differed by type of cement, w/cm, cement content, supplementary cementitious materials

(SCMs), use of chemical admixtures, and aggregate type. Compressive strength, permeability, freeze-thaw resistance, and restrained

shrinkage cracking were evaluated and documented in this report. Lower w/cm resulted in high early compressive strengths and rates of

strength and strain development. Increasing the w/cm to 0.44 and Class F fly ash replacement levels up to 30% was beneficial in

controlling strength gain. A low cement content mixture with increased w/cm and fly ash replacement proved to be beneficial. When

SCMs were not utilized, a low cement content of 6.0 bags was beneficial. When SCMs were used, increased cement content helped to

maintain the same properties. Type G, coarse-ground cement was beneficial to strain and strength at the higher w/cm of 0.42 and low

cementitious materials content. At a lower w/cm of 0.38, the mixture behaved similarly to the control mixture fabricated using Type II

cement, developing strain and strength at an average rate.

A high dosage rate of a shrinkage reducing admixture was extremely beneficial in controlling both the development rate and ultimate

strain of the mixture, while maintaining adequate development of ultimate strength at all ages. An average dosage rate of a set retarder

only retarded the initial strength development slightly. After 1 day of age, the development of strength and strain was substantially

increased. Although the concrete containing the set retarder reached higher compressive strengths more quickly than anticipated, the

concrete did not crack in the AASHTO PP34 test and was moderately durable.


Format:
PDF
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:4140c2dd7475a2e14ba3a30c029d7f0166cda44f232f6e165cd7bfa92ee9cb00
Download URL:
https://rosap.ntl.bts.gov/view/dot/18117/dot_18117_DS1.pdf
File Type:

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