Kavassu Crum is a Crumb Rubber based Modified Bitumen produced by blending crumb rubber and other additives compatible with bitumen grade VG – 10, VG -20 & VG – 30. Kavassu Crum which is crumb rubber modified bitumen (CRMB), is prepared in a centrally located state-of-the-art plant equipped with special high shear mixing facility, with high sheer homogenizer the first of its kind in our country. Kavassu Crum has been specially designed after extensive research to meet the requirements of high traffic intensity, increasing axle & pointloads, and varying climatic conditions throughout the country.
Kavassu Crum is the ideal binder to overcome the concurrent problems of raveling, rutting, undulations, cracking, bleeding, shoving and pot-holding in existing bituminous pavement. Bituminous mix, prepared with Kavassu Crum has a higher stiffness modulus, enhanced fatigue life,better resistance to creep & higher indirect tensile strength and quite suitable as renewal course & overlay materials on surface which are badly cracked and subjected to heavy traffic
Crumb Rubber Modified Bitumen is recommended for roads with heavy traffic and located in extreme climatic conditions. Kavassu Crum performs better than neat bitumen in heavy rainfall areas and in situation where the aggregates are prone to stripping. Due to its better creep resistance properties, Kavassu Crum can also be used at busy intersections, bridge decks, and round about for increased life of surfacing. Kavassu Crum also finds useful applications in porous asphalts. The selection of the grade of Kavassu Crum will be based on traffic intensity and climatic conditions as given in page no. 2. Even it is much better than using antistriping compound with bitumen for getting better coating on aggregates.
Crum Rubber Modified Bitumen
• Improves adhesion between aggregate and binder.
• Higher resistance to deformation at elevated pavement temperature.
• Higher fatigue life of mixes.
• Delay of cracking and reflective cracking.
• Lower susceptibility to seasonal temperature variations.
• Improved ageing resistance.
• Improved resistance to stripping/moisture damage.
• High Marshall stability.
• Overall improved performance in extreme climatic and under heavy traffic conditions.
• Does not require change in construction practices/machinery.
• Overall improved performance in extreme climatic conditions and under heavy traffic conditions.
- Description
-
Kavassu Crum is a Crumb Rubber based Modified Bitumen produced by blending crumb rubber and other additives compatible with bitumen grade VG – 10, VG -20 & VG – 30. Kavassu Crum which is crumb rubber modified bitumen (CRMB), is prepared in a centrally located state-of-the-art plant equipped with special high shear mixing facility, with high sheer homogenizer the first of its kind in our country. Kavassu Crum has been specially designed after extensive research to meet the requirements of high traffic intensity, increasing axle & pointloads, and varying climatic conditions throughout the country.
Kavassu Crum is the ideal binder to overcome the concurrent problems of raveling, rutting, undulations, cracking, bleeding, shoving and pot-holding in existing bituminous pavement. Bituminous mix, prepared with Kavassu Crum has a higher stiffness modulus, enhanced fatigue life,better resistance to creep & higher indirect tensile strength and quite suitable as renewal course & overlay materials on surface which are badly cracked and subjected to heavy traffic
Crumb Rubber Modified Bitumen is recommended for roads with heavy traffic and located in extreme climatic conditions. Kavassu Crum performs better than neat bitumen in heavy rainfall areas and in situation where the aggregates are prone to stripping. Due to its better creep resistance properties, Kavassu Crum can also be used at busy intersections, bridge decks, and round about for increased life of surfacing. Kavassu Crum also finds useful applications in porous asphalts. The selection of the grade of Kavassu Crum will be based on traffic intensity and climatic conditions as given in page no. 2. Even it is much better than using antistriping compound with bitumen for getting better coating on aggregates. - Advantages
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• Homogeneous product free from separation & settlement.
• Improves adhesion between aggregate and binder.
• Higher resistance to deformation at elevated pavement temperature.
• Higher fatigue life of mixes.
• Delay of cracking and reflective cracking.
• Lower susceptibility to seasonal temperature variations.
• Improved ageing resistance.
• Improved resistance to stripping/moisture damage.
• High Marshall stability.
• Overall improved performance in extreme climatic and under heavy traffic conditions.
• Does not require change in construction practices/machinery.
• Overall improved performance in extreme climatic conditions and under heavy traffic conditions.
Tested By
Kavassu Crum is produced in a state of the art central plant with a high sheer blender & homogenizer as per the guidelines laid down by IRC SP: 53 & Indian standard IS:15462 specifications for Polymer & Rubber Modified Bitumen. Kavassu Crum has been tested by premier institutes of the our country like Delhi Test House, NewDelhi, Star Wire Laboratories Faridabad, Ministry of Small & Medium & Micro Enterprises Hyderabad etc. as per IRC: SP: 53 and IS: 15462 & has been found to fully meet the guidelines and standard specifications. Kavassu Crum has given excellent field performance & is found to be cost effective in long term applications. Kavassu Crum is available in bulk as well as in drums.
|
Minimum Pavement Temperature 0C |
Maximum Atmospheric Temperature, 0C | |||
| <35 | 35 to 45 | >45 | ||
| <-10 | Kavassu Crum 50* | Kavassu Crum 55 | Kavassu Crum 55 | |
| 10 to -10 | Kavassu Crum 50 | Kavassu Crum 55 | Kavassu Crum 60 | |
| >10 | Kavassu Crum 55 | Kavassu Crum 55 | Kavassu Crum 60 | |
*Not below 150C
Temperature of mixing and rolling shall be slightly higher than con- ventional bituminous mixes.
| Stage of work | Indicated temperature 0C |
| Binder at mixing | 165-185 |
| Mix at mixing plant | 140-160 |
| Mix at laying site | 130-150 |
| Rolling at laying site | 115-135 |
| SL | Characteristics | Grade | Method of Test | ||
| Kavassu Crum 50 | Kavassu Crum 55 | Kavassu Crum 60 | IS No | ||
| i) | Peneration at 250 Cm 0.1 mm, 100 g, 5s | <70 | <60 | <50 | 1203 |
| ii) | Softening point (R&B), 0C, Min | 50 | 55 | 60 | 1205 |
| iii) | Flash point , COC, 0C, Min | 220 | 220 | 220 | 1209 |
| iv) | Elastic recovery of half thread in ductile meter at 150C, percent Min | 50 | 50 | 50 |
Appen.1 of IRC:SP:53-2002/ Annex. A of IS 15462:2004 |
| v) | Separation, difference in softening point (R&B), 0C, Max | 4 | 4 | 4 |
Appen.1 of IRC:SP:53-2002/ Annex. B of IS 15462:2004 |
| vi) | Viscosity at 1500C, Poise Requirement of IS 15462:2004 | 1-3 | 2-6 | 3-9 | 1206 (part 2) |
| vii) | Thin film oven test and tests on residue | ||||
| Loss in mass, percent, Max | 1.0 | 1.0 | 1.0 | 9382 | |
| Increase in softening point 0C, Max | 7 | 6 | 5 | 1205 | |
| Reduction in penetration of residue, at 250C, percent, Max | 40 | 40 | 40 | 1203 | |
| Elastic recovery of half thread inductile meter at 250C, percent, Min | 35 | 35 | 35 | Appen.1 of IRC:SP:53-2002/Annex. A of IS 15462:2004 | |
As per ISO-9001
Kavassu Crum is available in three grades:
Kavassu Crum 50 (CRMB 50), Kavassu Crum 55 (CRMB 55)
Kavassu Crum 60 (CRMB 60). Conforming to IS:15462 & IRC; SP: 53
- Selection Criteria
-
Minimum Pavement Temperature 0C
Maximum Atmospheric Temperature, 0C <35 35 to 45 >45 <-10 Kavassu Crum 50* Kavassu Crum 55 Kavassu Crum 55 10 to -10 Kavassu Crum 50 Kavassu Crum 55 Kavassu Crum 60 >10 Kavassu Crum 55 Kavassu Crum 55 Kavassu Crum 60 *Not below 150C
Temperature of mixing and rolling shall be slightly higher than con- ventional bituminous mixes. - Stagewise Temperature Requirement
-
Stage of work Indicated temperature 0C Binder at mixing 165-185 Mix at mixing plant 140-160 Mix at laying site 130-150 Rolling at laying site 115-135 - Properties
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SL Characteristics Grade Method of Test Kavassu Crum 50 Kavassu Crum 55 Kavassu Crum 60 IS No i) Peneration at 250 Cm 0.1 mm, 100 g, 5s <70 <60 <50 1203 ii) Softening point (R&B), 0C, Min 50 55 60 1205 iii) Flash point , COC, 0C, Min 220 220 220 1209 iv) Elastic recovery of half thread in ductile meter at 150C, percent Min 50 50 50 Appen.1 of IRC:SP:53-2002/
Annex. A of IS 15462:2004
v) Separation, difference in softening point (R&B), 0C, Max 4 4 4 Appen.1 of IRC:SP:53-2002/
Annex. B of IS 15462:2004
vi) Viscosity at 1500C, Poise Requirement of IS 15462:2004 1-3 2-6 3-9 1206 (part 2) vii) Thin film oven test and tests on residue Loss in mass, percent, Max 1.0 1.0 1.0 9382 Increase in softening point 0C, Max 7 6 5 1205 Reduction in penetration of residue, at 250C, percent, Max 40 40 40 1203 Elastic recovery of half thread inductile meter at 250C, percent, Min 35 35 35 Appen.1 of IRC:SP:53-2002/Annex. A of IS 15462:2004 - Quality Assurance
-
As per ISO-9001
- Grades
-
Kavassu Crum is available in three grades:
Kavassu Crum 50 (CRMB 50), Kavassu Crum 55 (CRMB 55)
Kavassu Crum 60 (CRMB 60). Conforming to IS:15462 & IRC; SP: 53
What Clients Say
Crystallomix-PG/PGS
The Performance Of “SHALIMAR’S KAVASSU CRYSTALLOMIX-PG/PGS (CRYSTALLINE ADMIXTURE) in our Six Lane Of Davangree Haveri Road Project found Good With 12-13% More Strength.
Rainsta Patch
Shalimar’s Kavassu Rainsta patch filler used in Hyderabad-Karimnagar-Ramagundam Road Project (HRK), SH-1 performed well and found very good.
Curex
Shalimar’s Kavassu Curex used in Construction of 4/6 Lanning of Pune –Satara Toll Road Project- Package-3 found excellent.
Admixture
Shalimar’s Kavassu Plast SP-431(Admixture) Used in construction of Nehru Outer Ring Road Expressway,Hyderabad in the state of Andhra Pradesh,India found very good.
