subscribe to ENR magazine subscribe
contact us
advertise
careers industry jobs
events events
FAQ
Mcgraw Hill Construction
ENR Logo
SUBSCRIBE TODAY
& receive immediate web access
comment

When Does It Pay To Use Innovative Concrete Products?

Text size: A A
[ Page 1 of 3 ]
Photo: Cary Kopczynski & Co
High-strength rebar is costly but cuts down weight, reducing overall costs, a new study says.
----- Advertising -----

New materials and methods available to concrete construction crews in the past decade present a financial dilemma:

A flashy material may offer advantages despite its upfront cost, but how do you know you aren’t sending your overall project into the red?

A research team took a stab at this problem and released their findings this morning to the Construction Industry Institute’s annual conference in Chicago. In some cases, the team found overall cost savings. For other scenarios, builders had to open their wallets.

As part of an ongoing CII craft productivity research program, the team studied three recent innovations in concrete—modular formwork, self-consolidating concrete and high-strength rebar—comparing them to their traditional counterparts.

Limited benchmarks make this type of study valuable.

“There’s not a whole lot of data out there,” remarked David MacNeel, operations manager at Baker Concrete Construction, a member of the CII team who spoke to ENR on the sidelines of this week’s conference.

Steeling the Show

High-strength rebar generally wins out over traditional steel reinforcement, the study shows.

Compared to traditional, 60-ksi rebar, the high-strength variety, rated at 100 ksi, costs twice as much to buy upfront. But it reduces overall reinforcing steel mass by 14% to 49%, translating into a net cost reduction of 12% to 33%. This assumes a 100-ksi rebar cost of $1,200 per ton versus 60-ksi rebar’s $600 per ton, with a labor cost of $710 per ton.

“The high strength steel definitely seemed to be on the winning end,” said MacNeel, with the caveat that only one supplier, MMFX Technologies Corp., Irvine, Calif., currently offers it

“You got to plan for it,” MacNeel added. “You can’t automatically think that you are going to be able to run down to the Home Depot to get some high-strength steel. It isn’t going to happen.”

The big advantages of high-strength steel are reduced rebar congestion (so concrete can flow evenly around it), reduced weight and increased design strength. Its detractors are higher cost, more brittleness, more complex structural analysis and its limited availability, researchers say.

Keywords:

[ Page 1 of 3 ]
----- Advertising -----
  Blogs: ENR Staff   Blogs: Other Voices  
Critical Path: ENR's editors and bloggers deliver their insights, opinions, cool-headed analysis and hot-headed rantings
Project Leads/Pulse

Gives readers a glimpse of who is planning and constructing some of the largest projects throughout the U.S. Much information for pulse is derived from McGraw-Hill Construction Dodge.

For more information on a project in Pulse that has a DR#, or for general information on Dodge products and services, please visit our Website at www.dodge.construction.com.

Information is provided on construction projects in following stages in each issue of ENR: Planning, Contracts/Bids/Proposals and Bid/Proposal Dates.

View all Project Leads/Pulse »

 Reader Comments:

Sign in to Comment

To write a comment about this story, please sign in. If this is your first time commenting on this site, you will be required to fill out a brief registration form. Your public username will be the beginning of the email address that you enter into the form (everything before the @ symbol). Other than that, none of the information that you enter will be publically displayed.

We welcome comments from all points of view. Off-topic or abusive comments, however, will be removed at the editors’ discretion.