General Description of Cationic Bitumen Emulsion CRS-1
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.
CRS-1 is a cationic rapid setting bitumen emulsion that contains 60% bitumen, is black in color, and is manufactured strictly as per ASTM D 2397M-13 standard.
Asphalt Emulsion CRS-1 is primarily used as a tack coat. The emulsion 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. CRS-1 consists of specially refined asphalt dispersed in water without the use of clay or similar substances as emulsifying or stabilizing agents. The cationic emulsified asphalt furnished under this specification shall be an emulsion of asphalt cement, water, and emulsifying agent. The emulsified asphalt shall be homogeneous. It shall show no separation of asphalt after thorough mixing within 30 days after delivery.
Application of Bitumen Emulsion CRS-1
RAHA Group Bitumen Emulsion CRS-1 is a specially designed water-based Bitumen Emulsion with low viscosity and fast setting that makes it an ideal product for Tack Coat spray application but one of the main applications of CRS emulsion is surface treatment (Chip seal, sand seal, and fog seal by cement curing). RAHA Group asphalt emulsion CRS-1 contains 60% bitumen and it is chocolate brown in color and is a free-flowing liquid at ambient temperature.
CRS-1 cures quickly and produces heavy asphalt films. CRS-1 is ideal for spray applications such as spray patching, sand seals, chip seals, and double surface treatments.
- Maybe sprayed in thicker films
- Thicker coatings on aggregates due to CRS-1’ viscosity leads to increased durability.
- Traffic can be restored very shortly after application.
- Ideal for use in hot temperatures
- No runoff
- Seals narrow cracks against moisture penetration
- Prevents slippage plane between layers
The main application of CRS asphalt emulsion is using for surface treatment projects as:
- Single surface treatment
- Multiple surface treatment
- Sand seal
RAHA Group Bitumen Emulsion CRS1 is ideally suited for Tack Coat application as well and other applications will see below:
- To ensure a proper bond between the existing surface and the new bituminous course being placed over it.
- To ensure the longevity of the road, it is important that the new bituminous surface bonds firmly with the underneath surface
- To coat and bond loose mineral particle on the surface of the surface layer
- To seal surface pores and make the surface water-resistant
- To impart structural stability and prevent lateral movement of the layer
- To assist adhesion between the base and superimpose surface course
- Tack coat application is a light spray of Bitumen Emulsion, which may be hand or machine sprayed. It is used to ensure a good bond between an old and a new bituminous surfacing layer. It is normally applied very thin and evenly over the entire surface.
Application Guidelines
- Clean/ prime/ tack pavement surface prior to application.
- Do not apply CRS-1 if precipitation is anticipated.
- Contact with RAHA Marketing representative for application temperature guidelines.
DESIGN GUIDELINES
Designs should be formulated prior to initial production and each time aggregate sources are changed. Testing of the final product is highly recommended to ensure a quality seal. RAHA Technical Services offers complete design services and product quality analysis.
POTHOLE PATCHING
When repairing potholes in pavement, the edges surrounding the pothole being patched should be coated with tack to ensure a bond between the asphalt edge and the patching material. Apply an even coating of CRS-1 to all sides of the hole (approximately 0.20 to 0.25 L/m2 (0.04 to 0.06 gal/yd2)).
SPRAY PATCHING
Spray patching consists of alternate applications of CRS-1 and aggregate to repair deteriorated areas in the pavement surface. Alternating layers of CRS-1 and aggregate may also be used to repair depressions in the road due to rutting or ravelling. Excellent adhesion means longer-lasting repairs.
SINGLE AND MULTIPLE CHIP SEALS
A controlled application of CRS-1 asphalt emulsion to a prepared surface followed by a controlled application of cover aggregate (per lift). Aggregates should be single-sized, washed chip with sizes ranging from 6 mm (¼ in) to 19 mm (¾ in). CRS-1 provides durable, longer-lasting surface treatments with increased resistance to rutting and low-temperature cracking.
Storage and Handling CRS-1
- CRS-1 should be stored in bulk tanks, ideally vertical to minimize surface area
- Do not allow CRS-1 to either freeze or boil: it will break. Safe storage temperatures range from 10°C (50°F) to 85°C (185°F).
- In bulk storage, mix the CRS-1 every 1 to 2 weeks (more frequently in cold weather). Mixing may be done by paddle agitator (slow), loose gear pump, slow centrifugal pump, or another suitable low shear pump.
- Do not bubble air through CRS-1 to agitate it: this creates excessive foam and may cause the CRS-1 to break
- Always use clean storage containers. Make sure prior contents are compatible with CRS-1 or the emulsion may break
- Only use approved and sealed containers for sampling the emulsion.
Advantage of Asphalt Emulsion CRS-1
At the following you can find some advantages of this product:
- Environment friendly
- No heating required
- Cost-efficient
- Easy and uniform spray
- Low-temperature curing, fast setting time
- High adhesive properties
- Prevents slippage of structural layers
Packing of Asphalt Emulsion CRS-1
RAHA Group Bitumen Emulsion CRS-1 is available in:
- Bulk as IBC Tank, FlexiTank
- Reconditioned steel drums 220 lit., Net Weight: 200 ± 3 Kg
- New steel drums 220 lit., Net Weight: 200 ± 3 Kg
Product Support
With the RAHA Advantage, you get a partner and advisor who will consult with you about designs, specifications, technical services, processes, and material selection. By developing innovative, custom-designed products that offer additional benefits such as peak performance in unique conditions, improved field performance, and greater environmental and health benefits, the RAHA Advantage provides significant long-term cost savings, resulting in a lower total cost of ownership.
Each lot of CRS-1 is produced using the strictest quality, safety, and environmental guidelines. Each production lot is tested to ensure it meets or exceeds all performance requirements and is delivered with a Certificate of Analysis
Specification of Bitumen Emulsion CRS-1
Emulsion Type: Rapid-Setting
Grade: CRS-1
Standard: ASTM D 2397M – 13
| 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 | 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 |
