Quote:
Originally Posted by Chellybean
there is no such thing in the concrete industry as fast cure, you can put calcium in the concrete during colder weather to accelerate concrete curing but it weakens concrete structure which isn't a big deal under tile floors generally. however it is the fill underneath the concrete that causes the problems with settling. They go through before putting plastic down they will vibratamp the sand to pack it. Then they use a Mapie Guard 2 rubber crack inhibitor over the concrete before the tile goes down, that does a pretty good job from tile cracking and will handle up to a 1/4 inch crack lateral not out of plain.
I can go into more detail but it would bore most people.
JUST A LITTLE FYI
P.S. if you ever see bridges being built, they are never done in the winter unless temperature of the concrete can be controlled and you alway see a water shower bath on the concrete in the summer so it cures at a slow rate, this is what gives the concrete its strength, there is quite a science around it
|
I am quite aware of this issue,,, The Pop Outs,, alot of debate on that issue.
The are different type of mixes for concrete. Concrete is guaranteed to reach a certain strength threshold if you will. It will reach that strength in 28 days. Alot of mixes for T&D are designed not to "Cure Fast" but to achieve desired strength in a shorter period of time.
Slabs on ground (e.g. pavements, sidewalks, parking lots, driveways, floors, canal linings) and structural concrete (e.g. bridge decks, piers, columns, beams, slabs, small footings, cast-in-place walls, retaining walls) require a minimum curing period of seven days for ambient temperatures above 40 degrees Fahrenheit1.
American Concrete Institute (ACI) Committee 301 recommends a minimum curing period corresponding to concrete attaining 70 percent of the specified compressive strength2. The often specified seven-day curing commonly corresponds to approximately 70 percent of the specified compressive strengths. The 70 percent strength level can be reached sooner when concrete cures at higher temperatures or when certain cement/admixture combinations are used. Similarly, longer time may be needed for different material combinations and/or lower curing temperatures. For this reason, ACI Committee 308 recommends the following minimum curing periods3:
Curing in Construction
http://www.calciumchloride.com/concrete.shtml
Little reading for those interested in this type of boring stuff.