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Mixing
of BRISTAR
I.
Mixing Equipment:
| Mix one bag (5 kg, 11 lb) of BRISTAR
with water at a time by hand or preferably with a mechanical
mixer. Prepare the following equipment.
(1) Container:
For one bag of BRISTAR - a metal bucket or clean can
of 10-20 liters capacity.
(2) Mixer: For
instance, hand-mixer.
(3) Water meter:
Breaker or measuring cylinder.
(4) Protection:
Rubber gloves, safety goggles.
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II.
Mixing Method:
| Pour approximately 1.5 liter (0.4
U.S. gallon) of water into container. Add one bag of BRISTAR
gradually and mix well until it has a good fluidity.
When a viscosity of the mixture of BRISTAR
and water is too high to pour into the hole, add a little
water to get a good fluidity. Do not exceed 34% of water
ratio (1.7 liter; 0.45 U.S. gallon per 5 kg; 11 lb.
of BRISTAR). The mixing time by hand-mixer is about
2-3 minutes (it is recommended that mechanical mixer
be used on large volume jobs). When mixing by hands,
wear rubber gloves.
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III.
Mixing Water:
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I. Use clean water, such as city water, river water,
etc., i.e. not contaminated with oil, organic substances,
etc.
II. Use the proper temperature of water for each grade
of Bristar (refer to table 1 and figure 1)
III. Cool water below 15°C (59°F) must be used
when the average atmospheric temperature is more than
30°C (86°F) for BRISTAR100.
IV. The cooler the water is, the longer BRISTAR will
remain fluid.
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Table
I. BRISTAR designed for various range of temperature
| TEMPERATURE
RANGES |
Product
|
Material
Temperature
Range |
Mixing
Water
Temperature |
Bristar
100
Bristar 150
Bristar 200
Bristar 300 |
59É
to 95É F
50É to 68É F
41É to
59É F
23É to 41É F |
59É
59É
50É
41É |
*B-100,
and B-200 used in this brochure indicate BRISTAR
100, 150, 200, and 300, respectively.
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Fig.
1 Time required that expansive stress reaches
6000 t/m2 and Temperature
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IV.
Standard Quantity:
| The quantity of BRISTAR to be used for
cracking differs with the hole spaces and diameters. In
Table 2, the relation between the quantity of BRISTAR
used and the hole diameters is indicated for the hole
of 1 m depth, where BRISTAR was mixed at a water ratio
of 30%. |
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Table
2. Quantity of BRISTAR used per hole depth and the hole diameters.
| Hole Diameter |
(mm) |
36 |
38 |
40 |
42 |
44 |
46 |
48 |
50 |
| BRISTAR |
(kg/m) |
1.7 |
1.9 |
2.1 |
2.3 |
2.5 |
2.8 |
3.0 |
3.2 |
| Hole Diameter |
(inch) |
1 3/8 |
1 1/2 |
1 5/8 |
1 3/4 |
1 7/8 |
2 |
| BRISTAR |
(lb/yd) |
3.1 |
3.7 |
4.4 |
5.1 |
5.8 |
6.7 |
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Filling
of the hole with BRISTAR:
| I. BRISTAR should be poured into
holes within 10 minutes after mixing with water. BRISTAR
may set up within 10 minutes losing its fluid properties
and becoming difficult to pour. Once its fluidity is gone,
it should not be diluted by re-mixing with water, as the
strength is greatly reduced.
II. BRISTAR is best placed using a bucket with
pour spout, coking gun or grouting pump, especially for a
horizontal hole. Try to drill horizontal holes with some slope
to help in filling.
III. BRISTAR must be poured into a hole to the
brim.
IV. For a horizontal hole, the hole can be easily
plugged with BRISTAR as it reaches a clay like consistency
as it starts setting up. A slight slope makes their use much
easier.
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| The
average quantity of BRISTAR used per 1 m3 is
5kg for the material to be broken when working in virgin
rock (8.4 lb/yd3). For fragmentation and reinforced
concrete, an amount of 2 to 4 times of that is required.
Design the hole diameter and the spacing by also referring
to Table 3 or 'Hole Design for Rock' and 'Hole Design for
Concrete' links (on the left) for specific needs. |
Table
3: The formula to calculate Hole Diameter and amount of BRISTAR:
LB/FT x Number of Holes x Depth of Holes‡44 (lbs.).
| Hole
Diameter |
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1
1/2" |
1
5/8" |
1
3/4" |
1
7/8" |
2" |
SUPER
BRISTAR
2000 |
(lb/ft)
|
no
|
1.8 |
2 |
2.2 |
no |
| (ft/bag)
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no |
6.1 |
5.4 |
4.9 |
no |
| BRISTAR |
(lb/ft) |
1.3 |
1.5 |
1.8 |
2 |
2.4 |
| (ft/bag)
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8.5 |
7.2 |
6.2 |
5.5 |
4.5 |
| Note: |
The
chart shows how many drilled feet one 11 lb. bag of
BRISTAR yields. There are four 11 lb. bags per case.
You may get 3% to 6% less due to field conditions
like spilling and actual hole size. |
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Use
of polyethylene sack in hole:
| I. If there is water in the
hole, place polyethylene thin sack equal to the hole diameter
into the hole, insert a wooden rod into the bag and then fill
BRISTAR into the sack. (See Fig. 2) The BRISTAR in the sack
will displace the water in the hole. There is no change in the
breaking effect by the use of this kind of sack.
II. When there are many joints or large voids
in the material to be cracked or when BRISTAR somewhat leaks
from the hole, use the sack.
III. When much water of the slurry is absorbed
to the material to be cracked (for instance, a dry concrete),
use the sack or spray water into the hole. In cold temperature,
avoid the water sprayed freezing in the hole.
IV. When the material to be cracked is in water,
use the sack indicated in Fig. 2. Try to use the bucket or
the pump when filling into the pipe, remove it up, and then
tie the sack to avoid BRISTAR filled diluting. If there is
no flow of water around an entrance of the hole, BRISTAR may
directly be poured into the hole using the pump and so on.
It should gently displace the water in the hole.
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Figure
2: Use of Polyethylene Sack in hole
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After
Treatment:
| I. Tamping with mortar or sand is not required
at all after the filling of BRISTAR. It is also not necessary
to put on any restrictive cap. Just leave as it is and wait
until crack initiates. Covering the filled hole with a plastic
cover is desirable to avoid dilution of BRISTAR from external
water source until cracking starts.
II. Spraying the surface with water after the
cracks initiate tends to increase the width of cracks and
speed the cracking process.
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