×
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

Heat production of massive concrete pylon cast in warm climate
2

Heat production of massive concrete pylon cast in warm climate

Heat production of massive concrete pylon cast in warm climate

(OP)
I'm involved with pylon-design for cable stayed bridge in warm climate, planning to use C50 (fck=50MPa) concrete (C40 in general, C50 in most critical cross sections), cross section is ~3*3,5 meters with 1,5m hole inside. What do you think, is the temperature production a problem, outside temp can reach up to 35-40C, sorry not familiar with Farenheit
Any tips for precautions to avoid cracks due to temp production? How to predict/control the temp production? Anything in internet concerning the problem?

Heikki

RE: Heat production of massive concrete pylon cast in warm climate

Since you have the capability to dissipate heat in the interior of the shaft through the 1.5m hole, I would not worry too much about the heat build-up as compared to true "mass" concrete.  I would follow ACI recommendations for "Hot Weather Concreting".

RE: Heat production of massive concrete pylon cast in warm climate

Agree with Ron.  Also:  try ACI 207.4R-93 for good recommendations on mass concrete and the heat/cracking problems.

RE: Heat production of massive concrete pylon cast in warm climate

(OP)
Thank you guys, this forum seems to be working well!

RE: Heat production of massive concrete pylon cast in warm climate

(OP)
Hello again,

Agree with you both, because of the shaft the heat production is well controlled when considering one casting section itself. But how about the previous casting section that has already cooled down, any worries that cracks might appear right above the casting joint (after latest casting section cools to the same temperature as previous one?). I've heard about some problems with similar climbing casting system in this climate with concrete C50 (cross section of pylon was bit larger though). I don't have ACI 'Hot weather concreting' or ACI 207.4R-93 with me right now (I'm already here behind God's back, it takes a while to get those), any change of finding those from internet?

Cheers, Heikki

RE: Heat production of massive concrete pylon cast in warm climate

In addition to the above, you could use a high quality fly ash as a component in your mix and don't let the Contractor get in a hurry to strip the forms.

RE: Heat production of massive concrete pylon cast in warm climate

I am working on the thermal gradient of concrte  results from the ambient temperature  which is not more that 50 C.  I am really seeking an answer for the effect of high ambient temperature on the bond between concrete beams and repair materials.
In case the concrete beam is casted in hot environemnt, there will be a thermal gradient occures in mid day between the surface and extends toward the repair system if the beam is repaired on the tension phase.

thatnk you
farhat

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

Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now
eBook - Managing the Context of Product Complexity Using the Digital Twin
Keeping track of changes to complex products is difficult—think Aerospace & Defense equipment, new generations of commercial aircraft, and software-based automobiles. A new way to managing the digital context of the physical product is required and the answer is the Digital Twin. This ebook explores the opportunity available for Operations and Maintenance for the Digital Twin. Download Now
White Paper - Trends in Industrial Filtration
Substantial progress has been made in filtration technologies in recent years. New filter media materials, designs and processes have led to filters that are more efficient, reliable, compact and longer lasting. This white paper will discuss the various trends that are impacting operational responsibilities of MROs today and the resources that are available for staying up-to-date on the latest filtration solutions. 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