KAVASSU CRUM

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Crum Rubber Modified Bitumen

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.

• 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.
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
• 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
<3535 to 45>45
<-10Kavassu Crum 50*Kavassu Crum 55Kavassu Crum 55
10 to -10Kavassu Crum 50Kavassu Crum 55Kavassu Crum 60
>10Kavassu Crum 55Kavassu Crum 55Kavassu Crum 60

*Not below 150C
Temperature of mixing and rolling shall be slightly higher than con- ventional bituminous mixes.

Stage of workIndicated temperature 0C
Binder at mixing165-185
Mix at mixing plant140-160
Mix at laying site130-150
Rolling at laying site115-135
SLCharacteristicsGradeMethod of Test
Kavassu Crum 50Kavassu Crum 55Kavassu Crum 60IS No
i)Peneration at 250 Cm 0.1 mm, 100 g, 5s<70<60<501203
ii)Softening point (R&B), 0C, Min5055601205
iii)Flash point , COC, 0C, Min2202202201209
iv)Elastic recovery of half thread in ductile meter at 150C, percent Min505050

Appen.1 of IRC:SP:53-2002/

Annex. A of IS 15462:2004

v)Separation, difference in softening point (R&B), 0C, Max444

Appen.1 of IRC:SP:53-2002/

Annex. B of IS 15462:2004

vi)Viscosity at 1500C, Poise Requirement of IS 15462:20041-32-63-91206 (part 2)
vii)Thin film oven test and tests on residue
Loss in mass, percent, Max1.01.01.09382
Increase in softening point 0C, Max7651205
Reduction in penetration of residue, at 250C, percent, Max4040401203
Elastic recovery of half thread inductile meter at 250C, percent, Min353535Appen.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
<3535 to 45>45
<-10Kavassu Crum 50*Kavassu Crum 55Kavassu Crum 55
10 to -10Kavassu Crum 50Kavassu Crum 55Kavassu Crum 60
>10Kavassu Crum 55Kavassu Crum 55Kavassu Crum 60

*Not below 150C
Temperature of mixing and rolling shall be slightly higher than con- ventional bituminous mixes.

Stagewise Temperature Requirement
Stage of workIndicated temperature 0C
Binder at mixing165-185
Mix at mixing plant140-160
Mix at laying site130-150
Rolling at laying site115-135
Properties
SLCharacteristicsGradeMethod of Test
Kavassu Crum 50Kavassu Crum 55Kavassu Crum 60IS No
i)Peneration at 250 Cm 0.1 mm, 100 g, 5s<70<60<501203
ii)Softening point (R&B), 0C, Min5055601205
iii)Flash point , COC, 0C, Min2202202201209
iv)Elastic recovery of half thread in ductile meter at 150C, percent Min505050

Appen.1 of IRC:SP:53-2002/

Annex. A of IS 15462:2004

v)Separation, difference in softening point (R&B), 0C, Max444

Appen.1 of IRC:SP:53-2002/

Annex. B of IS 15462:2004

vi)Viscosity at 1500C, Poise Requirement of IS 15462:20041-32-63-91206 (part 2)
vii)Thin film oven test and tests on residue
Loss in mass, percent, Max1.01.01.09382
Increase in softening point 0C, Max7651205
Reduction in penetration of residue, at 250C, percent, Max4040401203
Elastic recovery of half thread inductile meter at 250C, percent, Min353535Appen.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

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