NATURAL BENTONITE::KAR-BEN

 

 PROPERTIES 

 

        The natural bentonite, KAR-BEN is pure, natural sodium based nontreated one, contains 90 % of  Montmorillonite, has a high swelling capacity, conforms to API 13 A nontreated Bentonite and TS 977-1993 Type – 2 bentonite’s specification.In water suspansion The natural bentonite KAR-BEN is dispersed not flocculate.  KAR-BEN has the certificate of conformance to TS 977, given by Turkish Standards Ưnstitution.The specific properties are given below.

25 gr KAR-BEN / natural bentonit
350 ml of distilled water suspension, test results

600 RPM Reading, fann 35 viscometer min. 30
Filtration Volume max. 12,5 cc
Yield min. 80 bbl
Moisture content max. 10 % (by weight)
Residue on 200 mesh wet screen analysis max 2,5 % (by weight)
Yield Point Plastic Viscosity ratio (Yp/Pv) max. 1,5
Dispersed Plastic Viscocity                     (5 ml. 10 % of sodium hexametaphosphate added
and than aged at room temperature)		 min. 10 Cp
Aged YP*/PV*, normal (YP/PV) ratio (Slury aged at 345 Fo on 200 psi for 16 hs.
at dynamic conditions and cool at room temp)		 min. 1,5
 
Normal YP*/PV*, disperse YP**/PV** ratio Disperse values is measured at 3% of H2O2 solution max. 3

 

 

APPLICATIONS

    a) For Drilling Fluids;

* Due to its good viscosity and jel forming properties helps to keep in suspention the weighting agents.

* Natural bentonite KAR-BEN makes good well cleaning by keeping low the slip velocity of cuttings.

* With its high quality and smooth filtercake maintains perfect well stability,

* Because of KAR-BEN ’s slipperiness property makes good lubrication at the bit and the drill strings

b) For Underground workings;

 Only natural bentonite,  is  permitted to add the cement slury for diaphram  walls,njection applications, pipe jackings,  pipe landings and tunnel works.

   It’s very dangerous to use treated bentonit for this purpose, because of high viscosity handling will be very dilfucult.

* For injections and for under ground  wall constractions;  slurry trench is applied and obtained a sufficient impermeability  with a low  price

* Highly viscous  slurry can be prepared with a small amount of the natural bentonite, KAR-BEN.

* KAR-BEN has an extremely high swelling capacity. Its aqueous suspensions have such a high viscosity that, to the  value of 40 marsh /sec which normally used for diaphragm walls and  similar applications  is reached after  a swelling  time of maximum  2 hours with 45-50 kg/m3  KAR-BEN natural bentonite suspensions.

c) For constractions;

* To constract impermeable cut off walls.

* To constract impermeable bulding walls.

* Natural bentonite, KAR-BEN is being used to constract, building walls resistant to load.   

 

ADVANTAGES

* When added to cement mixtures,  it suspends the sand in the period of mixing and injection and balances the stability of mixture.  Natural bentonite, KAR-BEN lower the seperation of the water  to minimum in the slurry.

* Natural bentonite, KAR-BEN – cement  slurry mixture, increases the penetration in to the fine granuled allivium and avoids the lost of cement. Natural bentonite, KAR-BEN- cement mixture flows as a fase and prizes homogeneously and becomes very hard. It resists to the chemical and underground water effects.

* When an aqueous suspension prepared with  6 %, natural bentonite, KAR-BEN is injected to a wet sand  its resistance increases.

* Mixtures of natural bentonite, KAR-BEN do not be effected by sulfate salts. It is recommended to be used natural bentonite, KAR-BEN  together with phosphates or silicates if the underground water has salt or lime.

* Adding 5 % sodium silicate in to the suspansions, jelling begins with a rised speed.

* Chemicals added  natural bentonite, KAR-BEN / cement and water slurries; can be used for injection  of alliviums with  permeabilities under 10 –1 cm/sec.

* The naturel bentonite , KAR-BEN is being used as a lubricant to plunge the pantoons and to drive in  piles. It  reduses  rubbings.

* To plug the cracks on the walls constructed to stop the water leakages, 1/1 natural bentonite KAR-BEN/ water mixture is used by rolling up with trowel and then coating with tar.

* A mixture prepared by adding neutral liquids, (like karosene) to the natural bentonite KAR-BEN- sand , is used to fill the cracks. The mixture can make a thick-strong  jell when contacts with water.

* To plug very thin cracks, it is recommended to prepare a mixture with 5 % of natural bentonite, KAR-BEN and pump it in to the crack with a special injector.

IMPORTANT NOTES:

* While preparing cement suspensions, natural bentonite KAR-BEN must be mixed to water first  and at least after two hours  cement be added.

* It is recommended to add  %0,5 Sodium phosphate or %5 sodium silicate to the cement suspensions, depending to the heat of the used water.

* It is more effective and economic to get ready enough natural bentonite KAR-BEN suspension at the beginning of the job

3. PACKING

         50 kg multilayer paper bags, and 1000 kg  big-bags available. The naturel bentonite  KAR-BEN  is dry and, easily flowable  grinded form.

 

 
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