×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Minimum Temperature to Bend Rebar

Minimum Temperature to Bend Rebar

Minimum Temperature to Bend Rebar

(OP)
Is there a minimum temperature to bend rebar? We have a legit bar bending operation at our construction site so I am not worried about bend radius and the like as we have machines that govern all that. But there was a question thrown out if there was a minimum ambient temperature to perform the bending. Section 7.3 of ACI 318 talks about heating the bar to bend to avoid cracks, but nothing about a minimum temperature. We will of course inspect the bar for cracks after we bend, but would like some input on if any knows of another code that would govern the min temp for bending operations. Thanks - Forrest

RE: Minimum Temperature to Bend Rebar

Not an answer to your question but if it's cold enough you're worried about bar bending causing cracking then I'm sure your workers are miserable, miserable workers are prone to make mistakes. How hard is it to put your rebar fab people in a temporary enclosure with a kerosene heater?

Have you checked ACI 306 regarding cold weather concreting?

Ian Riley, PE, SE
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries https://www.facebook.com/AmericanConcrete/

RE: Minimum Temperature to Bend Rebar

I remember way back (40+ years) and 60 grade stirrups were spec'd... it was cold and in winter and I accidentally dropped one of the stirrups on a concrete surface, and, it broke.

Dik

RE: Minimum Temperature to Bend Rebar

CRSI has looked at this in the past but since I am no longer there I cannot comment on their current recommendations. Check the tech notes available on crsi.org
That said, some bar may be brittle at temps below about 32F while some may be ductile below that temp. I would expect A706 and dual-spec (A615/A706) bars to be ductile at colder temps.
Many shops bend outdoors year round, with bars well below freezing. Others maintain slightly warmer temps to reduce brittleness and operator comfort/safety. In the field, ACI 301-16 3.3.2.8(a) requires partially-embedded bars to be warmer than 32F because of the experience of some in the industry.

RE: Minimum Temperature to Bend Rebar

You are specifically looking for the ductile to brittle transition temperature.

I would assume there is research similar to the linked report below within your industry/country based on bars manufactured to your reinforcement standard (some minimum requirements might be located in this standard).
Link

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - Simulation-Driven Design With SOLIDWORKS
Simulation-driven design can reduce the time and cost of product development. In this engineering.com eBook, we’ll explore how SOLIDWORKS users can access simulation-driven design through the SOLIDWORKS Simulation suite of analysis tools. Download Now
eBook - Integrating the Engineering Ecosystem
Aras Innovator provides multiple options for integrating data between systems, depending on the scenario. Utilizing the right approach to meet specific business requirements is vital. These needs range from authoring tools, federating data from various and dissimilar databases, and triggering processes and workflows. Download Now
Research Report - Simulation-Driven Design for SOLIDWORKS Users
In this engineering.com research report, we discuss the rising role of simulation and the paradigm shift commonly called the democratization of simulation. In particular, we focus on how SOLIDWORKS users can take advantage of simulation-driven design through two analysis tools: SOLIDWORKS Simulation and 3DEXPERIENCE WORKS. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close