Evaluation and Testing of a Lightweight Fine Aggregate Concrete Bridge Deck in Buchanan County, Iowa Evaluation and Testing of a Lightweight Fine Aggregate Concrete Bridge Deck in Buchanan County, Iowa Evaluation and Testing of a Lightweight Fine Aggregate Concrete Bridge Deck in Buchanan County, Iowa

Research Project

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Evaluation and Testing of a Lightweight Fine Aggregate Concrete Bridge Deck in Buchanan County, Iowa

Image: Pile of lightweight fine aggregate before mixing at central plant

Lightweight fine aggregate before mixing at central plant

Image: Rear angle view of fully loaded tandem-axle dump truck with orange diamond ROAD WORK AHEAD warning sign mounted to the back of it driving across bridge deck and researcher near the end of the bridge monitoring wheel paths and directing the driver

Live load testing one year after bridge construction and initial load testing

Researcher(s)

Principal investigators: Peter Taylor, 515-515-294-9333, ptaylor@iastate.edu (project list)

Co-principal investigators:

Project status

Completed

Start date: 07/01/12
End date: 06/30/16

Publications

Report: May 2016, Evaluation and Testing of a Lightweight Fine Aggregate Concrete Bridge Deck in Buchanan County, Iowa 3.28 mb (*pdf)

Related publications: Evaluation and Testing of a Lightweight Fine Aggregate Concrete Bridge Deck in Buchanan County, Iowa 734.97 kb *pdf May 2016

*To read pdf files, you may need to download the free Adobe Acrobat Reader.

Sponsor(s)/partner(s)

Sponsor(s): Federal Highway Administration State Planning and Research Funding
Iowa Department of Transportation
Iowa Highway Research Board

Partner(s): Iowa Department of Transportation and Buchanan County Engineering

About the research

Abstract:

Internal curing is a relatively new technique being used to promote hydration of portland cement concretes. The fundamental concept is to provide reservoirs of water within the matrix such that the water does not increase the initial water/cementitious materials ratio to the mixture, but is available to help continue hydration once the system starts to dry out. The reservoirs used in the US are typically in the form of lightweight fine aggregate (LWFA) that is saturated prior to batching.

Considerable work has been conducted both in the laboratory and in the field to confirm that this approach is fundamentally sound and yet practical for construction purposes. A number of bridge decks have been successfully constructed around the US, including one in Iowa in 2013.

It is reported that inclusion of about 20% to 30% LWFA will not only improve strength development and potential durability, but, more importantly, will significantly reduce shrinking, thus reducing cracking risk. The aim of this work was to investigate the feasibility of such an approach in a bridge deck.

2711 S. Loop Drive, Suite 4700, Ames, Iowa 50010-8664
Phone: 515-294-9501 ~ Fax: 515-294-0467
The Bridge Engineering Center is administered by Iowa State University's Institute for Transportation.

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