The document presents a study on crumb rubber modified bitumen (CRMB) as a sustainable alternative in highway materials, addressing the growing environmental issue of polymer waste, particularly scrap tires. It details the processes for extracting crumb rubber, the benefits and challenges of using it in bitumen, and concludes that CRMB significantly enhances the properties of conventional bitumen while also promoting recycling and reducing environmental pollution. Key findings suggest that using specific sizes of crumb rubber optimizes performance and stability, making it a viable option for construction.

1. NAME OF THE INSTITUTE, PARUL UNIVERSITYSCHOOL OF ENGINEERING AND TECHNOLOGY 1
Department of Civil Engineering
M.Tech Transportation Engineering & Planning
Course: Highway Materials and Construction(PTR103)
Year/Semester – I/I
CIA IV
2018-19
Presentation on
Study on Crumb Rubber Modified Bitumen
Presented By:
Kunal R. Bhadane
(PRN No. 18SUN1207)
Presented to:
Mr.Premanand Naktode
Professor,
Civil Engineering Department,SOET,SUN

2. NAME OF THE INSTITUTE, PARUL UNIVERSITYSCHOOL OF ENGINEERING AND TECHNOLOGY 2
Contents
Introduction……………………………………………………………………………………………..3
Why Polymer Waste Materials Modified Bitumen (PWM-MB)?.................6
Basic Process of Extracting Crumb Rubber………………………………………………7
Advantages and Disadvantages………………………………………………………….……9
Conclusion…………………………………………………………………………………………..…10
References………………………………………………………………………………………..……11

3. NAME OF THE INSTITUTE, PARUL UNIVERSITYSCHOOL OF ENGINEERING AND TECHNOLOGY 3
Introduction
• In recent years, one of the primary and global environmental problems is the landfill disposal
of Polymer waste material (PWM).
• About 1.5 billion waste tires are generated each year on the world scale.
• Management of PWM in the world primarily has three ways to deal with; landfill, burning
and recycling

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• Crumb rubber
The scrap tyre is shredded into small pieces by the help of mechanical blades up to sizes of
1mm-75µm.
• CRMB Development
Charles McDonald ,an engineer with City of Phoenix, Arizona, US developed in 1960s.
• Source of Crumb Rubber
Crumb rubber is obtained from truck or automobile tyres.
• Method of mixing of CR in Bitumen
a) Dry process
b) Wet process

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Dry Process:-
•Introduced by two Swedish company
•Crumb rubber as a substitute for a part of mineral aggregate
Wet Process:-
• Thoroughly mixing crumbs of CR with bitumen and allowing it to react for a period of
45min-1 hour.
• High temperature should be maintained.

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Benefits of
PWM-MB
Environmental
Economic
Technology
Improvement of basic and rheological
properties of modified asphalt binders (MA)
*Reducing structural road thickness,
Reducing cost of pavements,
* Saving in energy & natural resources,
* Up to 50% thickness reduction by using
PWM is possible
Emissions reduction, Reduced
waste quantities, Reduce traffic
noise, Clean environment = Save
human health
Why Polymer Waste Materials Modified
Bitumen (PWM-MB)?

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Basic Process of Extracting Crumb Rubber
1.Segregation process:- Rubber waste collected from various sources must be separated from
other waste.
2. Cleaning process:- Rubber waste get cleaned and dried
3. Shredding process:- Will be shredded or cut into small pieces in form of aggregate size. Size
ranging from 4 mm to 75um

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4. Collection process:- The rubber pieces were sieved through 22.4mm sieve and retained at
5.6mm sieve and these were added in bituminous mix 10% to 20% by the weight of stone
aggregate.

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Advantages
• Lower susceptibility to daily & seasonal temperature variations.
• Higher resistance to deformation at elevated pavement temperature.
• Better adhesion between aggregates & binder.
• Prevention of cracking & reflective cracking.
• Overall improved performance under heavy traffic conditions
Disadvantages
• The bitumen-rubber materials must be properly selected , designed & produced .
• Construction is more challenging as temperature requirement are more critical.
• It is not possible to store CR-MB at elevated temperature without equipping storage tanks
with augurs.

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Conclusion
1. By studying the test results obtained by the researchers of the conventional bitumen and
the crumb rubber modified bitumen it is concluded that the penetration value and the
softening value of the conventional bitumen can be improved significantly by modifying it
with addition of the crumb rubber which is a major environment pollutant.
2. It is observed by the researchers that the sample prepared using crumb rubber size
(600μm-300μm) gives the highest stability value , minimum air voids ,minimum flow value,
maximum unit weight and minimum VMA and VFB % values. So the best size to be used for
crumb rubber modifications can be suggested as ( 600μm- 300μm) size for commercial
production of crumb rubber.
3. As a result, and from an environmental and economic point of view, the use of both CR
and PUF instead of virgin polymer modifiers is possible and preferable recycling method for
these wastes, resulting in cost savings, lower energy consumption and lower environmental
pollution.

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References
(1). “National Highways Development Project: An Overview”(PDF) . Government of India.
P.1-2. Retrieved 7 june 2014.
(2). “Roadways (CIA Factbook)”. CIA ,United States. Retrieved 3 april 2013.
(3). The study of Souza and Weissman (1994) using a binder with 15% rubber content ( size of
0.2,0.4, and 0.6mm) in dense-graded bitumen.
(4).Ministry of Road Transport & Highways (MORT &H), “Specifications for road and bridge
works”.
(5). http://www.pavementinteractive.org/
(6). http://www.trb.org/NCHRP/NCHRP.aspx
(7). Mix design methods for Asphalt concrete and other hot- mix types, Asphalt institute manual
series NO.2 (MS-2),6.
(8). S.K. Khanna and C.E.G. Justo “Highway Engineering” 2008
(9). Bureau of Indian standards , paving bitumen-specification( third revision) is 73:2006, july
2006
(10). IRC SP:53-2002, 2004, 2010 “Guidelines on use of polymer and crumb rubber.

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Thank you
for your
Attention