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When
your shotcreting project requires super adhesion and high first-pass
thickness (5 to 6 inches), your choice is ST-ALKALI FREE.
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This
liquid accelerator blends easily and completely and can be injected
directly at the shotcrete nozzle, permitting low dosages (2%
to 6% by weight of cement). Within seconds it generates low
heat that lasts for approximately 15 minutes outlasting the
initial set stage to enable another pass without fallout and
without compromising final strength.
ST-ALKALI
FREE provides extreme workability and meets or exceeds ASTM,
ACI, and all other "in-situ" shotcrete requirements for initial
and final strength. It is ideal for use in mines, tunnels, piers,
soil stabilization, bridge repair and any other shotcrete applications.
This accelerator is a stable modified alum in an aqueous solution.
It is designed for wet or dry process shotcreteing applications.
Because it is alkali free, non-caustic, non-toxic, and free
of chlorides or nitrates, ST-ALKALI FREE is extremely safe for
all applications, even underground or in other confined areas.
ST-ALKALI FREE is the most environmentally safe accelerator
available.
ST-ALKALI FREE is a cost saver, too. In addition to lower dosages,
you get better adhesion, which means that more material stays
in place. There is minimum rebound and cleanup is easy.
Properties:
 Low Dosages
(2% to 6% by weight of cement)
Compatible
with Most Cement Types
Meets or
Exceeds ASTM and ACI Requirements
Applications:
Mines
Tunnels
Piers
Soil Stabilization
Bridge
Repair
Basic ST-ALKALI FREE specifications:
Furnished
in 275-gallon (1,000 liters) plastic totes or bulk.
Net weight:
3,060 pounds (1,400 kilograms) per plastic tote.
Specific
gravity: 1.35
Shelf life
of 2 plus years. Not temperature sensitive.
Corrosive
to metal in pure solution.
In permanent
solution, no agitation is necessary, giving full flow control
during application.
Note: The suggested mix design and requirements below are for
example only. Mix designs and requirements will vary according
to the application.
High Performance ST-ALKALI FREE Requirements:
Compressive Strength - Minimum*
Material Proportions
| |
kg/m3* |
lb./cu.yd. |
| Cement
Type |
400
kg/m3 |
675
lb./cu.yd. |
| Silica
Fume (optional) |
40
kg/m3 |
67
lb./cu.yd |
| 10mm
Coarse Aggregate 3/8 |
420
kg/m3 |
710
lb./cu.yd. |
| Concrete
Sand Well Graded F.M.-2.7 |
1130
kg/m3 |
1900
lb./cu.yd. |
| Water
Reducing Admixture |
1
liter |
25
fl. oz. |
| Superplasticizer |
4
liter |
100
fl. oz. |
| Air
Entraining Mixture |
*as
required |
|
| Steel
Fiber (if required) |
60
kg/m3 |
100
lb./cu.yd. |
| Shot-Set
250 3% |
11
liter |
.26
lbs. |
| Water |
190
kg/m3 |
320
lb./cu.yd. |
| Total |
2255 |
3800 |
High Performance ST-ALKALI FREE Sample Mix Design
Material Proportions
| Cement
Type |
400
kg/m3 |
675
lb./cu.yd. |
| Pozzolan
(optional) |
40
kg/m3 |
67
lb./cu.yd |
| 10mm
Coarse Aggregate 3/8 |
420
kg/m3 |
710
lb./cu.yd. |
| Concrete
Sand Well Graded F.M.-2.7 |
1130
kg/m3 |
1900
lb./cu.yd. |
| Water
Reducing Admixture |
1
liter |
25
fl. oz. |
| Superplasticizer |
4
liter |
100
fl. oz. |
| Air
Entraining Mixture |
as
required |
as
required |
| Synthetic
Fiber (if required) |
4.53
kg/m3 |
10
lb./cu.yd. |
| ST-ALKALI
FREE |
11
liter |
.26
lbs. |
| Water |
190
kg/m3 |
320
lb./cu.yd. |
Material Safety Data Sheets
Click here to view
MSDS data sheets for ST-Alkali Free. Note: The free Adobe
Acrobat Reader program is required to view and print these
data sheets. Click
here to get Acrobat Reader.
Information on other Shotcrete Technologies products, detailed
price lists, specifications and references are available upon
request.
NOTE: Due to continuous development and improvement, we reserve
the right to modify the design and specifications of our products
without notice.
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