Description
Cationic Bitumen Emulsion CRS-1 is primarily used as a tack coat. The emulsion is used as a tack coat (either as is or diluted 50% with water) or fog seal (diluted 50% with water) and applied with a distributor. Bitumen Emulsion CRS-1 is a rapid-setting cationic asphalt emulsion that reacts quickly with aggregate to convert from an emulsion to asphalt.
Asphalt emulsions are classified according to the electric charge that surrounds the emulsion’s asphalt particles (i.e. whether it is a cationic or an anionic emulsion) and how quickly the suspended asphalt particles separate from the surrounding water (“breaking”). A rapid-setting emulsion is one that will destabilize quickly when in contact with aggregate.
The setting speed of any emulsion is relative to atmospheric conditions at the time of construction. Bitumen emulsion consists of three basic ingredients: bitumen, water, and an emulsifying agent. Based on specifications it may contain other additives, such as stabilizers, coating improvers, anti-strips, or break control agents. It is well known that water and asphalt will not mix, except under carefully controlled conditions using highly specialized equipment and chemical additives.
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Application of Bitumen Emulsion CRS-1
While general guidelines can be given for selecting emulsions, laboratory testing is strongly recommended. There is no substitute for a laboratory evaluation of the emulsion and the aggregate to be used. Different types and quantities of emulsion should be tried with the aggregate to find the best combination for the intended use. An experienced technician can determine the type and grade of the emulsion to be used.
- Environmental considerations.
- Proper application for pavement preservation or pavement distresses.
- Traffic type and volume.
Advantages of Bitumen CRS-1
- Wide variety of emulsion types available today
- Economical
- Free from danger ( for fire )
- Environmental
- Harmless for worker health.
Difference between Cationic Bitumen Emulsion CRS-1 and CRS-2
The most significant difference between CRS-1 and CRS-2 lies in their utilization and curing. CRS-1 is a cationic bitumen emulsion that is quick-setting and commonly used for surface dressing, fog seal, and road repair where curing should occur quickly. It is designed to bond quickly with the aggregates and hence ideally used where traffic is light or quick return to service is required.
On the other hand, CRS-2 is a slow-setting emulsion, and it provides the emulsion longer to adhere to the aggregates, so it suits heavy traffic roads and where there is a need for more workability and stronger adhesion. Its longer curing time grants it greater adhesion and durability, especially where there is heavy traffic or harsher conditions. Both emulsions find extensive use in road construction and maintenance, but use of CRS-1 or CRS-2 varies based on the specific curing speed and traffic load requirement in the application area.
Packing of Bitumen Emulsion CRS-1
Packing of bitumen emulsion CRS-1 is in a new thick steel drum on a pallet to prevent any leak inside of container also bulk in bitutainer and tanker.
Specification
| PropertyProperty | Min | Max | Test Method |
|---|---|---|---|
| Test on Emulsions | |||
| Viscosity, Saybolt Furol at 25 °C, SFS | 20 | 100 | ASTM D244 |
| Storage stability test, 24-h, % | – | 1 | ASTM D6930 |
| Demulsibility, 35 mL, 0.8 % dioctyl sodium sulfosuccinate, % | 40 | – | ASTM D6936 |
| Coating ability and water resistance: | |||
| Particle charge test | Positive | Positive | ASTM D244 |
| Sieve test, % | – | 0.1 | ASTM D6933 |
| Distillation : | |||
| Oil distillate, by volume of emulsion, % | – | 3 | ASTM D6997 |
| Residue, % | 60 | – | ASTM D244 |
| Tests on residue from distillation test: | |||
| Penetration, 25°C (77°F), 100 g, 5 s | 100 | 250 | ASTM D5 |
| Ductility, 25°C (77°F), 5 cm/min, cm | 40 | – | ASTM D113 |
| Solubility in trichloroethylene, % | 97.5 | – | ASTM D2042 |
FAQs of Cationic Bitumen Emulsion CRS-1
1. Why is CRS-1 special in comparison to other emulsions like RS, MS, or SS types?
CRS-1 is a polymer modified rapid setting cationic bitumen emulsion. In contrast to RS or SS types, CRS-1 offers greater adhesion, flexibility, and durability due to the incorporation of polymers. CRS-1 sets faster like RS types but has higher performance under heavy traffic and harsh weather conditions.
2. Does CRS-1 have to be heated before use?
No, CRS-1 is cold application and does not require heating. Its modification to the polymer gives it better workability and strength without the need for heating, rescuing it from being hazardous and environmentally unfriendly.
3. How long is the shelf life of CRS-1 emulsion?
CRS-1 in general has a storage life of 6 to 9 months if sealed containers are kept away from sunlight and extreme temperatures. Polymer modification makes it stable all along.
4. Is CRS-1 suitable to be employed in rainy or damp climates?
Yes, the rapid setting and polymer content of CRS-1 provide excellent resistance to moisture and allow it to be used even under damp or wet conditions. However, application during rain must be avoided so that a proper cure can be achieved.
5.Can CRS-1 be used for surface dressing or tack coat?
In fact, CRS-1 is particularly suited for tack coats and surface dressing due to its quick setting properties and enhanced adhesion through polymer modification. It yields a good pavement layer bonding and long-term surface protection.
