Rubber Crumb Modified Bitumen Other Names

1. Rubber bitumen – Often used to highlight the addition of rubber.
2. Rubber modified asphalt – Highlights its use in asphalt applications.
3. Rubber crumb modified asphalt – Specifically indicates the use of rubber crumb in asphalt.
4. CR modified bitumen – Abbreviation for rubber crumb modified bitumen.
5. Recycled rubber bitumen – Indicates the use of recycled rubber.
6. Bitumen rubber – A simple term used in various contexts.
7. Rubber asphalt concrete (RAC) – Used in road construction.
8. Rubber asphalt binder – Focuses on its role as a binding agent in asphalt.
9. Rubber hot mix asphalt – Highlights the hot mix process in asphalt applications.
10. Rubber binder – Highlights its function as a binding agent in construction.
11. Rubber-enriched bitumen – Indicates the incorporation of rubber into bitumen.
12. Rubber-modified binder – General term for bitumen modified with rubber.
13. Rubber granular road pavement binder – Used in the context of road construction.
14. Rubber-coated road binder – Highlights its application in road construction.
15. Rubber tire asphalt – Refers to the use of rubber derived from tires in asphalt.
16. Elastomer-modified bitumen – Emphasizes the elastic properties imparted by rubber.
17. Rubber-coated sealant – Used in the sealing of roads.
18. CR bitumen – Abbreviation often used in technical documents.

Crumb Rebber Modified Bitumen

Rubber granulate production: This is the initial phase where scrap tires are mechanically ground into fine particles, creating rubber granulate. The size of these particles is usually between 0.6 and 0.8 mm.

Pre-mix: The rubber granulate is mixed with hot bitumen, usually at temperatures around 180 °C. The high temperature is necessary for the rubber particles to swell and absorb the bitumen.

Digestion phase: The mixture is kept at high temperature for a period of time, the digestion or reaction time. This period can vary between 1 and 2 hours and allows the rubber granulate to be fully absorbed into the bitumen. During this process, the rubber particles swell, soften and partially dissolve, creating a thicker, more viscous material.

Final mix: After the digestion phase, the mixture is thoroughly stirred to ensure that the rubber granulate is evenly distributed throughout the bitumen. This can be achieved by using high-speed shear mills.

Filtration and Storage: The CRMB is filtered to remove any large, undissolved rubber particles and then stored at high temperatures to prevent separation prior to use.

Use in Asphalt Mixes: The finished CRMB product is mixed with aggregates (rocks, sand, etc.) to make the asphalt mix used for paving.

Crumb Rebber Modified Bitumen Grades

1. CRMB 60: Tailored for warm climates, this grade blends bitumen with rubber granules to improve the bitumen's elasticity and increase its softening point, making it more resistant to high temperatures. This reduces the risk of rutting and heat-related damage to the road surface.
   
2. CRMB 55: This grade is suitable for general climates where temperatures vary significantly throughout the year. It ensures optimum performance at varying temperatures and is ideal for a wide range of road construction projects including motorways, urban roads and residential streets.
3. CRMB 50: For colder climates with frequent sub-zero temperatures, CRMB 50 is the preferred choice. This formulation maintains flexibility at lower temperatures, reducing the likelihood of cracking caused by thermal shrinkage. The added rubber granules increase the bitumen's resistance to cold cracking and thermal fatigue.

Durability of Rubber CRUMB Modified Bitumen(CRMB)

Rubber crumb modified bitumen (CRMB) is known for its improved durability compared to conventional bitumen, making it an excellent choice for road construction, especially in regions with extreme weather conditions or high traffic volumes. This improved durability is due to several unique properties of CRMB:

Improved elasticity: The incorporation of rubber crumb gives CRMB superior elasticity. This allows it to better accommodate contraction and expansion caused by temperature fluctuations and reduces the likelihood of cracking and rutting.

Increased deformation resistance: High temperatures and heavy traffic can cause road surfaces to deform and form ruts. CRMB's increased rutting resistance contributes to its superior durability as it can withstand deformation under these conditions.

Superior aging properties: CRMB has improved aging properties. The rubber crumb slows the oxidation process of the bitumen, which helps prevent brittleness and maintain the flexibility of the pavement over time.

Water Damage Resistance: The rubber granules in CRMB create a denser, more flexible binder-aggregate matrix that improves resistance to water damage and delamination, thus extending the life of the pavement.

Fatigue Resistance: CRMB's improved elasticity also improves its resistance to fatigue cracking, a common type of damage in asphalt pavements subjected to repeated loading.

Performance of Rubber Crumb Modified Bitumen (CRMB)

The performance of rubber crumb modified bitumen (CRMB), or rubberized asphalt, far exceeds conventional bitumen in several key areas. Its unique properties make it a preferred material for road construction projects, providing improved functionality under a variety of conditions:

Elasticity: The incorporation of rubber particles gives CRMB greater elasticity. This elasticity allows it to recover after deformation from heavy traffic or temperature fluctuations, reducing the likelihood of permanent deformation or rutting.

Crack resistance: CRMB's improved flexibility reduces its susceptibility to both low temperature cracking (caused by cold weather contraction) and fatigue cracking (caused by repeated traffic loads).

Thermal stability: CRMB retains its physical properties over a wider temperature range than conventional bitumen. This makes it suitable for regions with extreme temperatures and it is less likely to become excessively soft at high temperatures or brittle at low temperatures.

Ruttling resistance: Under heavy traffic conditions or high temperatures, conventional bitumen can form ruts or grooves. CRMB offers greater resistance to this type of road damage, improving road safety and longevity.

Reduced noise pollution: CRMB pavements have been observed to reduce tire-to-road noise, making them an attractive solution for urban areas or highways near residential areas.

Increased skid resistance: Asphalt made from CRMB often has greater skid resistance, which can lead to improved road safety, particularly in wet conditions.

Durability: Thanks to their superior resistance to common forms of road wear and damage, CRMB pavements generally have a longer service life. This results in lower life cycle costs for road infrastructure.