Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Mass concrete

[Subject Prev][Subject Next][Thread Prev][Thread Next]
It doesn't matter whether it is called mass concrete or not. The question is, "Is there sufficient heat differential between the interior and exterior concrete temperatures to cause cracking?" If the mix involved has a high cement content, or has a high enough initial temperature, the answer is probably "Yes". When in doubt, treat it as mass concrete. You can either keep the internal concrete temperature as low as possible or insulate the whole deal to slow down heat loss.

We were involved in a project with 6 foot diameter columns cast with 5000 psi concrete. The concrete was cast in winter in Chicago. When the contractor stripped the forms 2 days later, the concrete rapidly formed alligator cracks all over.

If it looks like mass concrete and quacks like mass concrete, treat it like mass concrete.

Jay Shilstone

At 05:15 PM 8/3/2004, you wrote:
I have a concrete pad, approximate 3' to 3'-6" thick, 26' wide, 100' long. Is this considered a "mass concrete"? ACI 207 talked about the cooling of mass concrete etc. Most of the ACI mass concrete reports are related to dam construction. Is this pad "massive" enough to cause any serious heat problem?

Thanks for any input.

Y i   Y a n g,   P. E.
STRUCTURAL DIVISION
SUMMIT ENGINEERING INC.
707.527.0775.x15
Santa Rosa, California






******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
* Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********