#1  
Old 11-13-2009, 07:19 PM
Apprentice
 
Join Date: Jun 2009
Location: Westchester
Posts: 118
Default cement primer

Is there a good website to learn about working with concrete? I know nothin', and had a builder doing other work form and pour the foundation. My first question - how long does it take for the foundation to cure before I can start on the base? We're about 1hr. north of NYC, and I assume temp has a lot to do with it. What about the hearth slab? I'll be using the FB board on top, so it will be 3.5", I think, according to the pompeii plans.
Reply With Quote
  #2  
Old 11-13-2009, 08:37 PM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: cement primer

It's advised to let your concrete cure for a week before loading it. Keep it damp, which shouldn't be a problem in this weather.

It's advised not to work with concrete under freezing, it significantly reduces the strength of bond. You're cutting it close here in the northeast unless you enclose and heat your worksite.
__________________
My geodesic oven project:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
,
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #3  
Old 11-13-2009, 08:42 PM
dmun's Avatar
Moderator
 
Join Date: Jul 2005
Location: New Jersey USA
Posts: 4,216
Default Re: cement primer

Quote:
Is there a good website to learn about working with concrete?
I was going to refer you to my concrete mixer primer, but photobucket has dumped my pics. I'll see what I can do to fix it, meanwhile, here's the text:

http://www.fornobravo.com/forum/f6/c...asics-790.html (Concrete mixer basics)

Edit: Pics Fixed.
__________________
My geodesic oven project:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
,
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #4  
Old 11-14-2009, 05:12 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: cement primer

The thread that dmun has linked to above is a good treatment of this subject.

Most of the problems that crop up on this site have to do with the moisture content. Too wet or too dry. Too wet weakens the concrete. Too dry and the concrete may not work into the corners of the form, leave a lot of voids or, in a worst case, not hydrate fully.

The amount of water to add cannot be determined exactly. There are too many variables such as the amount of moisture already present in the aggregate. As a general "rule of thumb" you can test your slump as follows:

Get a shovel full of concrete. Tilt the shovel up at a 45 degree angle. The concrete should start to flow off the shovel at this angle.

Last edited by Neil2; 11-14-2009 at 05:18 PM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Obligatory first-time-mortar-concerns post kebwi Tools, Tips and Techniques 16 11-10-2009 03:04 PM
How bad are cement bricks? zeek General Building and Construction 6 10-07-2009 10:54 PM
Mixing cement for the Hearth by hand blacknoir Getting Started 6 07-13-2009 09:30 PM
cement question boily Getting Started 6 06-12-2009 02:21 AM
Cement Curing Conditions rlf5 Getting Started 4 07-18-2007 06:50 AM


All times are GMT -7. The time now is 02:11 AM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC