TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Examination of Cement and Aggregate Type on the Crack-Resistance of Colorado's Bridge Deck Concretes

Accession Number:

01340004

Record Type:

Component

Abstract:

In 2003, the Colorado Department of Transportation (CDOT) revised their Standard Specifications for Road and Bridge Construction to include two new classes of structural concrete. Class H and HT concrete were included into the standard specifications as a crack resistant concrete. These concretes are currently used in the construction of bridges and other concrete structures in Colorado. Recently, the CDOT has discovered a number of bridge decks throughout the state constructed with Class H and HT concrete that exhibit cracking. It is suspected that the rate of strength gain for these concrete mixtures may in part be a contributing factor to this cracking. Several bridge decks have obtained the 56-day compressive strength within three days. This paper examines the effect of using coarse-ground cement and lightweight aggregate to decrease cracking potential. Hardened concrete properties tests included compressive strength, freeze/thaw durability, permeability, and restrained shrinkage. The coarse-ground cement lowered the ultimate shrinkage strain; however, cracked at earlier ages when compared to mixtures containing Type II cement. Internal curing using lightweight aggregate was effective in reducing ultimate shrinkage strain. All mixtures exhibited low permeability at 56 days of age and satisfactory freeze/thaw resistance. Reduced strain development minimizes drying shrinkage cracking; thereby reducing maintenance costs over the life of the structure.

Supplemental Notes:

The DVD lists the title of this paper as: Effect of Cement and Aggregate Type on Crack Resistance of Colorado's Bridge Deck Concretes.

Monograph Accession #:

01329018

Report/Paper Numbers:

11-3296

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Cavaliero, Robert W
Durham, Stephan Anthony

Pagination:

17p

Publication Date:

2011

Conference:

Transportation Research Board 90th Annual Meeting

Location: Washington DC, United States
Date: 2011-1-23 to 2011-1-27
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Photos; References (10) ; Tables (5)

Geographic Terms:

Colorado

Subject Areas:

Bridges and other structures; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete

Source Data:

Transportation Research Board Annual Meeting 2011 Paper #11-3296

Files:

TRIS, TRB

Created Date:

Feb 17 2011 6:28PM