KAVASSU ANTISTRIP

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An Adhesion Improving Compound For Bituminous Construction

Since a large number of stone aggregates from various quarries in the country have been found to show appreciable stripping of bitumen when tested by static immersion test as per IS: 6241, it is necessary that the aggregate to be used for particular road construction should be tested for the stripping properties. If the aggregate shows to be taken to Improve the bond between binder and stone aggregate, so that the stripping does not take place when the coated stones/ bituminous surface is exposed to water in the form of rain, ground water, mist etc. Most suitable method of improving this is the incorporation of a suitable chemical in the bitumen. A product under the name of Kavassu Antistrip has been developed for this very purpose. This is an Anti stripping and adhesion improving compound having a high molecular weight Cationic chemicals as its active constituent when used in small quantities say about 0.4-1.5% by weight of bitumen binder, it has been found to display water from the stones and coat them uniformly with bituminous mix. By virtue of its surface active properties It Is finding an extensive use in the bituminous road construction. Even in places where the problem due to presence of water does not exist, the Incorporation of Kavassu Antistrip generally tends to prolong the life of the road by promoting the adhesion between the aggregate and the binder It also produces a compact close textured surface.

1. Lowers the surface tension of binder thus facilitates uniform coating of aggregates.
2. Improves the workability and penetrating power of bitumen.
3. Prevents stripping of binder from aggregates and formation of pot holes.
4. Improves the wet strength of bituminous mix.
5. Helps in the surface dressing of roads even in wet weather.
6. Allows the use of larger range of aggregates,
7. Improves distribution and suspension of the filler,
8. Displaces water from the aggregates and helps bitumen to stick to the surface.

In general 0.6% of Kavassu Antistrip (by wt of bitumen) is sufficient to give excellent results but since nature of a aggregate differs from place to place, therefore quantity of Kavassu  Antistrip should be evaluated in the lab. before its use in the field. It may vary from 0.4-1.5%

General
Since a large number of stone aggregates from various quarries in the country have been found to show appreciable stripping of bitumen when tested by static immersion test as per IS: 6241, it is necessary that the aggregate to be used for particular road construction should be tested for the stripping properties. If the aggregate shows to be taken to Improve the bond between binder and stone aggregate, so that the stripping does not take place when the coated stones/ bituminous surface is exposed to water in the form of rain, ground water, mist etc. Most suitable method of improving this is the incorporation of a suitable chemical in the bitumen. A product under the name of Kavassu Antistrip has been developed for this very purpose. This is an Anti stripping and adhesion improving compound having a high molecular weight Cationic chemicals as its active constituent when used in small quantities say about 0.4-1.5% by weight of bitumen binder, it has been found to display water from the stones and coat them uniformly with bituminous mix. By virtue of its surface active properties It Is finding an extensive use in the bituminous road construction. Even in places where the problem due to presence of water does not exist, the Incorporation of Kavassu Antistrip generally tends to prolong the life of the road by promoting the adhesion between the aggregate and the binder It also produces a compact close textured surface.
Advantages

1. Lowers the surface tension of binder thus facilitates uniform coating of aggregates.
2. Improves the workability and penetrating power of bitumen.
3. Prevents stripping of binder from aggregates and formation of pot holes.
4. Improves the wet strength of bituminous mix.
5. Helps in the surface dressing of roads even in wet weather.
6. Allows the use of larger range of aggregates,
7. Improves distribution and suspension of the filler,
8. Displaces water from the aggregates and helps bitumen to stick to the surface.

Dosage

In general 0.6% of Kavassu Antistrip (by wt of bitumen) is sufficient to give excellent results but since nature of a aggregate differs from place to place, therefore quantity of Kavassu  Antistrip should be evaluated in the lab. before its use in the field. It may vary from 0.4-1.5%

KAVASSU ANTISTRIP

The requisite quantity of Kavassu Antistrip  should be added to hot bitumen at about 130-140 C. Kavassu Antistrip should be added in small quantities & bitumen stirred continuously to obtain a homogenous mix. Then bitumen should be used as usual. Kavassu Antistrip is available in liquid as well as Powder from.
The bonding between asphalt and aggregate is of special importance because it is the primary characteristic that influences the integrity of pavement, This bonding must be established at the initial stage of contact between the asphalt and the initial stage of contact between the asphalt and the aggregate and must endure during the life time of the pavement. Loss of bonding results in lowered performance. The pavement strength is attributed to (1) cohesive resistance of the binder (2) the adhesive bond between the binder and the aggregate, (3) the aggregate Inter lock and the frictional resistance between aggregate particles. A number of different methods have been used to strengthen the adhesion of asphalt to aggregate and to lower the pavements propensity to strip, deformation and aging from the intrusion of moisture.When incorporated into the binder , Kavassu Antistrip promotes chemical  adhesion  between  the  binder  and   the   aggregate and promotes adhesion of the binder to the road  surface  be it wet or dry. When Kavassu Antistrip is dissolved in the binder, it arranges itself so that it is attached to the stone on the one hand and the binder on the order , thus ensuring complete contact with the binder, it is important that the viscosity of the binder is sufficiently low as to enable the Kavassu Antistripto move to the stone surface and this is always achieved at normal spraying or coating temperatures. It can be seen therefore, that coating chips with a solution of adhesion agent is not the most effective and economical way of applying adhesion agents . The treated binder method ensures that the Kavassu Antistrip can orientate itself  at the two interfaces, i.e, aggregate/ binder and binder/road surface, thus ensuring maximum chemical adhesion at both . An obsolete method of applying adhesion agents to surface dressing was to sprinkle a solution of the agent on the binder before appli- cation of the aggregate. This method, apart from being inaccurate and laborious, suffered from the disadvantage of not providing adhesion at the road/binder interface. If Kavassu Antistrip is to function efficiently as a binder additive, the binder must  not  be too viscous or the movement of the Kavassu Antistrip molecules will be impeded. Correct spraying and mixing temperatures will ensure that viscosity promotes maximum efficiency.
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Kavassu Antistrip solutions are flammable. Do not expose to naked flames or other sources of ignition. Containers should be tightly sealed when not in use. In the event of fire, extinguish with Co2 or foam.

220 liter drums

Kavassu Antistrip Solution may cause sensitization by inhalation and skin contact. Wear suitable protective clothing, gloves & eye/ face protection. Barrier creams provide additional skin protection. Should accidental skin contact occur, remove skin contact occur, remove immediately with soap & water. Do not use solvent. In case of contact with eyes, rinse immediately with plenty of clean water and seek medical advise.

None.

As per ISO 9001.

IS: 14987- 2004.

Fire & Safety

Kavassu Antistrip solutions are flammable. Do not expose to naked flames or other sources of ignition. Containers should be tightly sealed when not in use. In the event of fire, extinguish with Co2 or foam.

Packing

220 liter drums

Health & Safety

Kavassu Antistrip Solution may cause sensitization by inhalation and skin contact. Wear suitable protective clothing, gloves & eye/ face protection. Barrier creams provide additional skin protection. Should accidental skin contact occur, remove skin contact occur, remove immediately with soap & water. Do not use solvent. In case of contact with eyes, rinse immediately with plenty of clean water and seek medical advise.

Environmental Hazard

None.

Quality Assurance

As per ISO 9001.

Confirms To Is Code

IS: 14987- 2004.

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