DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Carpentry and Woodworking > sidewalk cement?




Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 06-28-2007, 01:10 PM  
starrider
Member
 
Join Date: May 2006
Posts: 37
Default sidewalk cement?

Hello folks...!

The question: hair line cracks in newly poured sidewalk?

In this city...the home owner is responsible for the sidewalk that surrounds their house.

The sidewalk needed repair...so i contracted a co. and did the about 6 yards of cement or concrete of sidewalk...4-5 weeks later i notice a hair line crack about 2 feet in lenghth.

Living in a Bay city...sand was and near the ocean...sand is under the cement. And it was not packed down as i later found out is one of the things to do.

Secondly the crack is within a ten feet of a large old tree..."roots"? However i was told that 5 weeks is not enough time for roots to effect the cement.

Lastly...could it be the cement it self? As when the finisher was doing the sidewalk ...he commented that the cement was funny or didn't seem to have the water amount he was accustom to...( i think)

Otherwise the finisher did an excellent job...and i am happy if the crack does not progress.

My last question is what is the best way to deal with hairline cracks...what are the best kinds of things to use...i was thinking of just pouring epoxy in the crack ....

Your opinions appreciated...Thanks!

Starrider



__________________
starrider is offline  
 
Reply With Quote Quick reply to this message
Old 07-10-2007, 09:11 AM  
timmy
Junior Member
 
Join Date: Jul 2007
Posts: 6
Default

Sorry to hear your troubles, please excuse my ignorance, but do your sidewalks have sawed out sections so it can expand and contract without cracking, did they saw any?

Epoxy should be fine, I'm pretty sure thats what our city uses, and I'm sure your city uses it on your roads for cracks.

Best of luck



__________________
timmy is offline  
 
Reply With Quote Quick reply to this message
Old 07-10-2007, 11:39 AM  
mudmixer
Contractor
 
mudmixer's Avatar
 
Join Date: Sep 2006
Posts: 587
Liked 42 Times on 35 Posts
Likes Given: 36

Default

Sounds like a typical shrinkage crack that has essentially died out. There may be others that are smaller that may show up later. The cause of the crack is not having control joints sawed or cracked at appropriate spacings. Concrete will always try to crack, so you control where the crack occurs. - The more cement and water in the mix, the more it shrinks and can crack.

Why do you want to fill the hairline crack? - You will not be keeping water out.

__________________
mudmixer is offline  
 
Reply With Quote Quick reply to this message
Old 07-11-2007, 01:09 AM  
Deacon
Custom Home Builder
 
Deacon's Avatar
 
Join Date: Jul 2007
Posts: 55
Default

There are only 2 guarantees in the concrete business -- 1. It will get hard and ----- 2. It will crack. Just as long as there was proper rebar/wire installation installed within the pour and the rebar/wire is within the pour and not just laying on the ground, the hairline crack should be no worry because the steel will hold it together. Some contractors use wire - wire is better than nothing but does not have the tensile strength that regular rebar has. A good concrete prep job consists of No. 3 steel bars installed in a 18" grid. As far as only sand underneath the concrete pour, having 1 3/4" rock is much better but that depends on your individual building code. Again, no matter what you do, concrete will crack. Mother nature always wins. All you can do is try to fight her back as much as possible.

__________________
Deacon is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
building cement hot tub? jefe100 General Home Improvement Discussion 6 08-13-2008 01:37 PM
Houses made with Cement block foundations Xilbus General Home Improvement Discussion 8 07-06-2008 07:45 AM
Basement Foundation Cement Blocks Crumbling Help! broloco Bricks, Masonry and Concrete 2 09-20-2007 02:40 PM
New sidewalk cement? starrider General Home Improvement Discussion 2 08-27-2007 04:51 PM
self-leveling cement over osb boards Gord Kurtenbach Flooring 3 07-11-2006 01:15 PM