Delayed Set Additive
Purpose
To delay the set of concrete on the job site. This allows the customer
to concentrate skilled finishing work.
What is It?
Delayed Set is a delayed set admixture in powdered form. Like all
Cart-Away admixtures, it is packaged in a patented water-soluble inner
bag for easy addition to the mix.
When to Use It?
Use Delayed Set whenever you need to slow down the set of concrete. Keep
it on hand for times when unexpected delays occur, such as when the
trailer arrives too early or the job site isn’t ready. Also use it on
hot days when natural curing times may be a challenge.
How Much to Use?
A good rule of thumb is that one 8-ounce bag will retard one yard of
concrete for one hour. This is true for a standard mix (5 sacks of
cement per yard) at concrete temperatures of 60-80˚ F.
Your Job Site
Only your customer can determine how many separate segments they want to
work on, which may differ according to the size of the job, capabilities
of the helpers, along with temperature and weather conditions. Included
in the Directions is an example of a 3-yard pour in three segments. You
can adapt from this to your own needs.
 |
Accelerator Additive
Purpose
To speed up the set time of concrete without affecting concrete
strength, durability, or color.
What is It?
It is a Non-Chloride Set Accelerator (NCA) in a powdered form. Like all
Cart-Away admixtures, it is packaged in patented water-soluble inner
bags for easy addition to the mix.
When to Use It?
Use on all jobs when you need to speed up set times for the most
efficient scheduling of workers. Most cold-weather jobs will require a
set accelerator to keep you from waiting long hours until the concrete
is ready to finish.
Accelerator
Advantages
-
Speeds up your set time by 1 to 5
hours
-
Contains no chlorides
-
Will not affect concrete color
-
Does not promote corrosion of
metals
-
Does not
promote efflorescence
Why Non-Chloride?
Calcium Chloride has been frequently used as an accelerator because it
is cheap and speeds up set times. However, major problems with Calcium
Chloride have become troublesome to the industry. You can’t
use it with
colored concrete, because uneven coloration results. It also causes
more shrinkage cracks. In addition, it weakens
the ultimate
strength of the concrete and promotes corrosion of reinforcing steel.
The job is likely to
deteriorate over
time, and may result in costly replacements
and
damage to your reputation.
|
Air Additive
Purpose
Air additive is used to increase the entrained air
content in exposed concrete that may be subject to freeze/thaw cycles.
It improves the durability of the concrete. If you increase the
entrained air content to about 6%, you greatly reduce the chances of
your concrete cracking or showing other damage later due to freezing and
thawing.
What
is it?
Air is an air-entraining admixture in powdered form. Like all Cart-Away
admixtures, it is packaged in a patented, water-soluble inner bag for
easy addition to the mix.
When
to Use It?
Use Air additive in all concrete that may be subject to winter freezing.
For a penny or two per square foot, it is among the least expensive
admixtures.
Advantages
-
Makes concrete more durable
-
Enhances dispersion of integral
colors
-
Decreases bleed water
-
Increased concrete workability for
finishing
|
