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  • Name: Expansive mortar
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WHAT’S SPLITSTAR® EXPANSIVE MORTAR?
SPLITSTAR® is the brand of our expansive mortar, it is a highly expansive powder composition for stone breaking, granite and marble quarrying, concrete cutting and demolition. SPLITSTAR® expansive mortar is safe, environment friendly and a good and viable alternative to explosives and other traditional methods of quarrying and demolition. SPLITSTAR® expansive mortar is mixed with clean water and poured into pre-drilled holes on rock and concrete. The diluted SPLITSTAR® expansive mortar swells and exerts significant expansive thrust on the hole-wall, fracturing the wall and splitting the rock across the line of the drill holes.

SPLITSTAR® expansive mortar are very easily split and fracture mass rock without producing any noise, vibration, toxic gases or flying debris. SPLITSTAR® expansive mortar is getting increasingly popular in quarrying and demolishing applications. expansive mortar can be used in a wide range of applications for safe demolition, concrete cutting, rock breaking and marble & granite quarrying. expansive mortar is particularly used for breaking, cutting or demolishing marble, granite and other natural stones, concrete and reinforced concrete.

Other SPLITSTAR® expansive mortar terminology reference,

Non-explosive Demolition Agent, Non-explosive Cracking Agent, Soundless (Silent, Noiseless) Cracking Agent (SCA), Expansive Demolition Agent, Expansive Agent, Expansive Mortar, Expansive Cracking Agent, Expansive Cement, Expansive Concrete, Chemical Rock Splitting

agent (HSA). Cracking Design Reference Chart.

ADVANTAGES:
1. High range soundless cracking
SPLITSTAR® expansive mortar is a soundless, non-explosive and safe demolition agent which is quite different from ordinary demolition agents such as explosives and dangerous materials. It does not cause any fly rock, noise, ground vibration, gas, dust or any other environmental pollution when used properly. Eliminates noise, fly rock and vibration potential caused by blasting or heavy mechanical means.
2. No license required
Using SPLITSTAR® expansive mortar does not require a special license unlike explosives, chemicals and so on.
3. Rapid usability
Since rock or concrete previously cracked with SPLITSTAR® expansive mortar is easily broken with breakers etc., the amount of time required for breaking of rock or concrete can be remarkably reduced.
4. Simple to Use mixed
SPLITSTAR® expansive mortar with a measured quantity of water and poured into the holes. Few minutes after pouring a reaction of hydration is taking place generating heat and crystallizing and expanding while hardening. If hydration takes place under confinement, significant expansive pressure will result, No need for detonator, ignition and professional operators.  also demolition work in water is possible.

COMPARISON OF DEMOLITION METHODS

There are many superior points in the demolition work performed by " SPLITSTAR® expansive mortar " as compared with the other demolition methods. It is also seen to be more economical.
 
 USES OF SPLITSTAR® EXPANSIVE MORTAR
Since BRISTAR demolishes objects by expansive stress, it is used for various purposes. In particular, BRISTAR is very suitable for demolition work in tight quarters where large-sized breaking machines or explosives cannot be used due to their causing environmental problems.

Stone&Rock

stone cutting, removing boulders
Slabbing
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
Excavation associated with tunneling
Trenching,Shaft sinking
Quarrying
Others

Concrete

Demolition of mass concrete
Demolition of foundations for machinery and structures
Demolition of pillar, beam, wall or slab of bridges
Demolition of temporary concrete structures
Demolition of piers
Demolition of retaining wall
Partial demolition of various concrete structures
Others

OTHERS
Demolition of fire-bricks
Demolition of bricks for structures

CHEMICAL COMPONENTS OF SPLITSTAR® EXPANSIVE MORTAR
It appears to be grayish white powder and be composed of multi-structured inorganic particles. There is no content of any harmful composition
• The SPLITSTAR® expansive mortar
1•  The expansive stress reach maximum value in about 24 hours of reaction.

However, it still increases afterwards.

2• the expansive stress would decrease if water ratio increases.

3• The expansive stress would grow up with rising temperature.

4•  The expansive stress would be higher if the diameter of pre-drilled hole is bigger.
 

 

FRACTURE MECHANISM
After SPLITSTAR® expansive mortar is poured into holes drilled in rocks or concrete, the expansive stress gradually increases with time, and reaches to more than 50Mpa equal to 6000 mt/m 2 at room temperature after 5 hours. As the Split-AG generates its expansive stress, the material to be cracked undergoes a process of (1) crack initiation, (2) crack propagation, (3) the increase of crack width. Therefore, this fracture mechanism is distinguished from a breakage by blasting.

The mechanism by the expansive stress of SPLITSTAR® expansive mortar is shown in Fig. 1. Cracks initiate from an inner surface of the hole, being caused by tensile stress at a right angle with the compressive stress which occurs by the expansive stress of SPLITSTAR® expansive mortar. The expansive stress of SPLITSTAR® expansive mortar continues even after the appearance of cracks, the cracks propagate and also new cracks initiate during the process. Usually, for a single hole, 2-4 cracks initiate and propagate. When a free surface exists, the crack, as shown in Fig. 2, is pushed apart mainly by the shear stress, and a secondary crack also arises from the bottom of the hole running toward the free surface.

Fig. 1 Fracture mechanism by the expansive stress of SPLITSTAR® expansive mortar
 

Fig. 2 Sectional-view of the crack formation in the material with two free surfaces

When multiple numbers of holes are filled with SPLITSTAR® expansive mortar, that are properly adjacent to each other, the cracks from the hole propagate to connect with the neighboring holes, as shown in Fig.

3. 

It is therefore possible to determine the directions of the cracks as planned by appropriately arranging the hole spacing and its depth and its inclination.
Establishment of free surface:
In the case of trenching, shafting or tunneling, if all holes are drilled vertically and filled with SPLITSTAR® expansive mortar, the crack width can not increase but horizontal cracks initiate. Therefore, in order to obtain two free surfaces, inclined holes or pre-splitting must be required. 

TYPE OF SPLITSTAR® EXPANSIVE MORTAR

Type

Usable temperature

SCA-Ⅳ

40℃-50℃( 104℉-122℉)

SCA-Ⅰ

25℃-40℃( 77℉-104℉)

SCA-Ⅱ

10℃-25℃( 50℉-77 ℉)

SCA-Ⅲ

-5℃-10℃( 23℉-50 ℉)

SPLITSTAR® expansive mortar may blow out of the holes due to the heat generation when hole diameter exeeds 50mm(2inches) ir when SPLITSTAR® expansive mortar is used at temperatures over the above.

PACKAGE:

SPLITSTAR® expansive mortar is packaged 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). 50 carton/1 ton,1 tons per wood crate.

STORAGE
1.Although SPLITSTAR® expansive mortar is packed in anti-moisture plastic bags, long storage may cause deterioration of its working ingredients. Therefore, store in a dry place and use it as soon as possible.

2.When storing, do not place the bags of SPLITSTAR® expansive mortar directly on floor, put them on a pallet and keep in a dry warehouse etc. SPLITSTAR® expansive mortar is stored in this manner, can be effectively used for about 1 year.

3.SPLITSTAR® expansive mortar should be unpacked before use.

4.When storing the portion of SPLITSTAR® expansive mortar remaining after use, push the air out of the bag, then seal with gum tape and use as soon as possible. However, as it may get exposed to moisture there is a risk of SPLITSTAR® expansive mortar losing its effectiveness once the bag has been opened.

5.If you receive broken bags of SPLITSTAR® expansive mortar, they may not work due to chance of moisture absorption.
 

STANDARD QUANTITY

 Pre-drilled hole design table
Materials & purpose Hole design
Diameter(mm) Hole spacing
 
Depth
深度
 Soft stone quarrying 28-38 200-300mm 105% of Height
 Hard stone quarrying 30-40 200-300mm 105% of Height
 Stone cutting 28-38 200-400mm 90% of Height
 Plain concerte demolition 30-40 300-500mm 80% of Height
 Reinforced concrete demolition 35-40 150-300mm 90% of Height

 

Reference consumption of
Hole diameter(mm) 30  32  34  36  38  40  42  44  46  48  50
Consumption (kg/m3) 1.2   1.3   1.5   1.7  1.9  2.1  2.5  2.8  3.0  3.2
Hole depth (m) 1

HOW TO USE THE SPLITSTAR® EXPANSIVE MORTAR
a. Mixing:  SPLITSTAR® expansive mortar is a powder that must be thoroughly mixed with clear water before used in a ratio of 30% of the overall weight (1.5 liters of each 5 kg packages). Gradually add the powder to water stirring all the time to obtain a smooth lump free mortar.

b. Filling:  Pour the mortar into the prepared holes within 5 to 10 minutes only .Stope horizontal holes to allow an easy pouring of SPLITSTAR® expansive mortar (should some of the mortar leak out of hole. Stop it with a piece or soft sponge) or fill the holes with thick mortar of SPLITSTAR® expansive mortar,

c. Drilling : The distance between holes varies depending on the size of the hole (from 32 mm diam. to 42 mm diam.) and the type of materials to be demolished or cut. For rock or non-reinforced concrete should be 30 to 60 cm. And reinforced concrete should be 20 to 30 cm.

Selection of Proper Type of SPLITSTAR® expansive mortar
To avoid blown-out shots the proper type of SPLITSTAR® expansive mortar should be selected in accordance with the temperature of the object to be demolished. NOTE :When the season is shifting, ex. winter to spring, or when tunnel or underground demolition work is carried out, carefully select the proper type of SPLITSTAR® expansive mortar in accordance with the temperature of the object to be demolished, not outdoor temperature, because the temperature of the object is often great[y different from the outdoor temperature. If the temperature of the object is higher than the outdoor temperature and the type of SPLITSTAR selected in accordance with the outdoor temperature is used, blown-out shots will certainly occur.

Temperature Estimation
As shown in following picture, place a thermometer in the bottom of the hole and leave it in place for 2-3 minutes. Then quickly pull out the thermometer and take a reading.
NOTE :Avoid taking temperature right after drilling since the temperature of the hole is higher because of friction heat.

Drilling
Drill holes designed for demolition with a drilling machine.
(1) Drilling machine : Jack Hammer, Leg Hammer etc.
(2) Drilling Direction : It is preferable to drill holes vertically, but in case of a wall or pillar of reinforced concrete where vertical drilling is hard, an inclined hole may be drilled. For horizontal holes, the same idea of spacing as with vertical holes can be applied. Try to drill horizontal holes with some slope.
(3) Drilling machine : Use of Spiral Sheath Pipes
In the case of a temporary concrete structure (to be demolished), place spiral sheath pipes as holes before placing concrete. When the structure needs to be cracked, fill the holes with SPLITSTAR® expansive mortar after removing the spiral sheath pipes.

There is no change in breaking effect by the use of spiral sheath pipes. However, spiral sheath pipes of 36-50mm (1 3/8"-2") diameter should be used.
NOTE : Never use vinyl chloride pipes etc. instead of spiral sheath pipe. Leg Hammer Spiral Sheath Pipe

Jack hammer

Spiral Sheath Pipe

SAFETY PRECAUTIONS
1. Wear safety goggles, rubber gloves, long sleeve cloth and helmet during SPLITSTAR® expansive mortar handling, mixing and filling.
2. Do not get your face close to or stand near filled holes for at least 3 hours after filling completion stop the hurt to eyes in case of blow out shots.
3. Wear a dust-proof mask when using SPLITSTAR® expansive mortar in poorly ventilated areas such as tunnels or mines.
4. Keep people away from job-site after filling mortar.
5. Skin contact with SPLITSTAR® expansive mortar must be rinsed off with large amounts of cold water immediately.  
6. Should you get spray from SPLITSTAR® expansive mortar in your eyes, do not rub but wash the eyes immediately with plenty of cold water and consult doctor.