1. SOUNDLESS CRACKING
   Unlike the exsisting method of demolition done by explosives or breaking equipment, BRISTAR quietly and gradually demolishes rock or concrete with its expansive stress (more than 30 N/mm 2 caused by hydration reaction, so that BRISTAR does not cause any noise, vibration, flyrock, dust and gas.
   
2. NO LICENSE
   Using BRISTAR does not require a special license unlike explosives, explosive agents, etc.
   
3. SIMPLE HANDLING
   Neither capping with mortar, sand, etc. nor tamping with a bar is necessary after BRISTAR mixed with water is poured into drilled holes in rock or concrete.
   
4. SYSTEMATICAL DEMOLITION AND DEMOLITION IN WATER
   BRISTAR can demolish rock or concrete systematically, and also demolition work in water is possible.
   
5. HIGH-EFFICIENCY DEMOLITION WORK
   Since rock or concrete previously cracked with BRISTAR is easily broken with breakers etc., the amount of time required for breaking of rock or concrete can be remarkably reduced.
   
   

1. Splitting of boulders
2. Slabbing
3. Excavation of rock wall or bedrock
   1. for road expansion
   2. for harbour expansion
   3. for residential development
   4. for various types of construction work etc
4. Excavation associated with tunneling
5. Trenching,Shaft sinking
6. Quarrying
7. Others

1. Demolition of mass concrete
2. Demolition of foundations for machinery and structures
3. Demolition of pillar, beam, wall or slab of bridges
4. Demolition of temporary concrete structures
5. Demolition of piers
6. Demolition of retaining wall
7. Partial demolition of various concrete structures
8. Others

1. Demolition of fire-bricks
2. Demolition of bricks for structures

1. CHEMICAL COMPONENTS OF BRISTAR
   BRISTAR is a powder product consisting of Calcium Oxide and an organic material.
2. SOME EFFECTS ON THE EXPANSIVE STRESS OF BRISTAR
   1. The expansive stress increases more than 30 N/mm2(Fig.1 & Fig.2). Generally, the compressive fracture stress of rock is 100 to 200 N/mm2 and that of concrete is 15 to 50 N/mm2. However, the tensile fracture stress is very small, for instance, it ranges from 4 to 7 N/mm2 in rock and 1.5 to 3 N/mm2 in concrete. Since demolition with BRISTAR is based on a fracture due to a tensile stress, all kinds of rock and concrete can be cracked and broken with BRISTAR when appropriate holes are properly drilled.
   2. The larger the hole diameter is, the greater the expansive stress becomes (Fig.3).
   3. There is little change in the expansive stress when the water ratio is in the neighborhood of approximately 30%. However, the stress is decreased as the water ratio is increased or decreased.
   4. The expansive stress along the hole depth is almost constant except for that near the entrance of holes. Generally, the expansive loss from the hole entrance has little effect on the demolition work when the hole depth is enough.
   5. When BRISTAR is properly used within the parameters as noted in the conditions, no spurt due to heat generation (blown-out shot) occurs, because of the BRISTAR's strong adhesion and frictional resistance to the upper surface of the hole.
      
      
   
   

BRISTAR is pacaged in 4 anti-moisture plastic bags of 5 kgs (11 lb) each , and the bags are placed in a carton box with a total net weight 20 kgs (44 lb).

1. Store BRISTAR in a dry place and use it as soon as possible. Though BRISTAR is packed in antimoisture plastic bags, long storage may cause deterioration of its working ingredients.
2. When storing, do not place the cartons or the bags of BRISTAR directly on a floor. Put them on a pallet and keep in a dry warehouse etc. BRISTAR stored in above-mentioned way can be effectively used for about 1year.
3. BRISTAR should be unpacked right before use.
4. When storing the portion of BRISTAR remaining after use, push the air out of the bag, then seal it with gum tape and use it as soon as possible. However, since it may get exposed to moisture, there is a risk of BRISTAR losing its effectiveness once the bag has been opened.
5. If you receive broken bags of BRISTAR, they may not work due to possible moisture absorption.

The quantity of BRISTAR to be used for cracking differs with the hole diameters and hole spacing. In Table 3, the relation between the quantity of BRISTAR used and the hole diameters is indicated for a hole of 1 meter in length, where BRISTAR was mixed at a water ratio of 30%.


* When an object with two or more free surfaces is demolished perfectly, the quantity of BRISTAR shown in the above Table is required.
* In case of demolition of boulders or bed rock, the required quantities of BRISTAR are 80% or 110% of indicated quantity in the above table, respectively.
* When an object with two or more free surfaces is demolished perfectly, the quantity of BRISTAR shown in the above Table is required.
* In case of demolition of boulders or bed rock, the required quantities of BRISTAR are 80% or 110% of indicated quantity in the above table, respectively. * In case of demolishing an object which has only one free surface or partial demolition etc. to smaller-sized blocks, the required quantities of BRISTAR increase in comparison with those shown in the above Table.

1. Hole Diameter
   Allowable range of hole diameter for BRISTAR is 36- 50mm (1 3/8" -2" ). The larger the hole diameter is, the greater the expansive stress becomes and the wider the hole spacing becomes.
2. Hole Length
   This varies with the shape of the object to be demolished or the break plan. (Refer to Table 5 regarding standard hole length.) When the length is less than 3 times that of the hole diameter, less cracking will occur, the breaking effect is lessened and the time required for demolition is increased.
3. Angle of Hole
   It is preferable to drill holes vertically, but in case of a thin material, consideration should be given so as to make a long hole by drilling it obliquely since a greater effect is achieved with a deeper hole.
   
4. Hole Spacing
   Hole spacing varies with the properties of rock, joint, volume to be removed, conditions of free surface, quantity of re-bars, secondary breaking, work period etc.
   
   

1. Equipment
   (1) Container : For one bag of BRISTAR-a metal round-shaped bucket or clean can with 10-20 liters capacity
   (2) Mixer : For instance, hand-mixer with saucer typed blade (Hand mixing is available.)
   (3) Water Measure : Beaker or measuring cylinder
   (4) Protector : Protective Glasses, Rubber Gloves, Dust-proof mask
   
2. Mix Proportion
   BRISTAR : 5 kgs (11 lb, 1 bag)
   Water : 1.5 liters (0.4 US gallon)
   Yield Volume : Approxmately 3.1 liters
   NOTE :Standard water ratio to BRISTAR is 30%.
3. Mixing Method
   (1)Pour 1.5 liters (0.4 US gallon) of clean water into a container beforehand and add one bag (5 kgs 11 lb) of BRISTAR gradually and mix well until it has good fluidity.
   (2) When the viscosity of the mixture of BRISTAR and water is too high to pour into holes, add a little water to get good fluidity.
   However, do not exceed 34% of water ratio (1.7 liters, or 0.45 US gallon, per 5 kgs, or 11 Ib of BRISTAR)
   (3) Mixing time using a hand-mixer is approximately 2-3 minutes (it is recommended that a mechanical mixer be used for large-volume jobs).
   When mixing by hand, be sure to wear rubber gloves.
4. Mixing Water
   (1)Use clean water such as city water, river water, sea water,which are not contaminated with oil, organic substances, etc.
   (2)Use the proper temperature of water for each type of BRISTAR referring to Table 2 on page 7.
   (3)In particular, cool water below 15. (59°F) must be used when average atmospheric temperature is more than 30. (86°F) for BRISTAR 100.
   (4)The cooler the water is, the longer BRISTAR will remain fluid.
   
   

1. Filling of the hole with BRISTAR
   (1) BRISTAR should be poured into holes within 10 minutes after mixed with water. If BRISTAR is left as it is more than 10 minutes after mixed with water, the BRISTAR gradually loses its fluidity so that it gets difficult to pour the BRISTAR into holes.
   NOTE :
   a. Do not leave BRISTAR in a container beyond 10 minutes because blown-out shots may occur.
   b. Once its fluidity is gone, it should not be diluted by re-mixing with water since the strength is greatly reduced.
   (2) BRISTAR must be poured into a hole to the top.
2. Use of Polyethylene Sack in Hole
   (1)When there are many joints or large voids in the object to be demolished and BRISTAR somewhat leaks from the hole or when there is water in the hole, place a polyethylene thin sack equal to or slightly larger than the hole diameter into the hole and then pour BRISTAR into the sack (Ref. Fig.8).
   
   If there is water in the hole, 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.
   NOTE :When a clayey layer of a rock creates a pocket in a hole during drilling, be sure to use the polyethylene sack for filling because filling of BRISTAR without the sack may cause blown-out shots.
   (2)When the object to be demolished is in water, use the sack indicated in Fig.8. Try to use the bucket or the pump when filling into the pipe, remove it, and then tie the sack to prevent the BRISTAR from be diluted. If there is no flow of water around the entrance of the hole, BRISTAR may be directly poured into the hole using a pump and so on. It should gently displace the water in the hole.
   For more convenient filling work, it is recommended to use BRISTAR PACK, a cartridge type of BRISTAR (Ref. photo on page 7).
   (3)When a great deal of water of the slurry is absorbed by the object to be demolished (for instance, dry concrete), use the sack or spray water into the hole before filling it with BRISTAR. In cold temperature, avoid freezing of the water sprayed into the hole.
   
   

1. Cover the filled holes with a plastic cover etc. to avoid any accident caused by blown-out shots.
2. Tamping with mortar or sand is not required at all after the BRISTAR is poured.
   It is also not necessary to put on any restrictive cap.
   Just leave as it is and wait until cracks initiate.
   
3. The time required for crack formation in material at 20.(68°F) is approximately 10-20 hours. The lower the temperature is, the longer the time for crack formation is.
4. Spraying the surface with water after cracks initiate tends to expand the width of cracks and speed up the cracking process.
   NOTE :Be sure to wear PROTECTIVE GLASSES when confirming the occurrence of cracks.