RUBBERISED BITUMEN FOR ROAD WORKS full report
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07-02-2010, 07:58 PM



.pptx   RUBBERISED BITUMEN FOR.pptx (Size: 246.83 KB / Downloads: 916)
RUBBERIZED BITUMEN FOR ROAD WORKS


Introduction

Development of infrastructural facilities like road is vital for the economic growth of a country. Good roads improve connectively, accessibility, mobility and productivity. The use of bitumen modified using polymeric materials like natural rubber, synthetic rubbers and plastic etc. have helped to a great extends in improving the quality of roads. Bitumen thus modified employing polymers are known as Polymer Modified Bitumen (PMB). Out of these Natural Rubber Modified Bitumen (NRMB) is widely used in road construction which is obtained by adding natural rubber latex to boiling bitumen.

HISTORY AND PRESENT STATUS

Rubberisation was first experimental in Kerala way back in 1974 when a 1km Stretch of the MC road was paved with Natural Rubber Modified Bitumen (NRMB). Though the experiments was successful there were not many takers for the process, mainly because of the shortage of quality NRMB.
 
After a long time Kochi Refineries started commercial production of rubberised bitumen in 1999. The Refineries is having a commercial plant with a production capacity of 15000 tonnes per year at a cost of Rs. 40 lakhs

PREPARATION OF RUBBERISED BITUMEN

Among various forms of rubber used, it is seen that rubber latex is the best form of rubber that can be incorporated into bitumen. The initial process for the production of NRMB was mostly insitu mixing of natural rubber latex with bitumen. For this the bitumen was heated to about 1400C and small amounts of (1%) of kerosene was added as viscosity modifier. To the boiling bitumen , natural rubber latex about 2 to 4% by weight of bitumen was added , stirred well and kept for about 2 hrs. for homogenization. Uniformly blended NRMB thus obtained was used for the urbanization of roads.

CASE STUDY

The following laboratory tests were carried out on the different blends as per relevant is
Penetration test
Softening point (0C)
Ductility (cms)
Loss on heating (%)
Viscosity
Stripping value test

ADVANTAGES OF NRMB

For superiority in quality to ordinary bitumen in terms of penetration, softening point and elastic recovery.
Less affected by changes in temperature. The effect of rubber is to increase the resistance to flow at high temperature and at the same time improve the resistance to brittle fracture at low temperature.
More retention of aggregates and elimination of bleeding.
Reduces environmental pollution by less consumption of bitumen.
Conserves energy, natural resources and bitumen.
Enhances tyre rolling and save fuel.
Reduces traffic noise pollution.
More comfort riding.
The roads surfaced with NRMB provide more service life than normal bitumen roads.
Reduction in the road maintenance cost.
It can be applied on the road by conventional mixing and mechanized techniques.
As a result of improved resistance of rubberised bitumen to temperature, the tendency for pavement cracking and fatting up is absent in roads surfaced with it.
Rubberised bitumen shows improved adhesion with aggregates.
Rubberisation of roads will create additional demand for natural rubber and it will ensure a remunerative price for rubber farmers.

COST OF RUBBERISATION

Based on commercial trails conducted in India and abroad , additional cost for rubberised roads comes to 15-20% compared to bituminous roads, however it is possible to get about at least 50% more service life for rubberised roads than normal bitumen. Also the studies conducted by the Central Road Research Institute, New Delhi, reveals that the cost for periodic maintenance of these roads can be reduced by 35% compared to that of the bituminous roads. The suggested renewal cycle with NR modified bitumen is 7-8 years, compared to 4-5 years for conventional bitumen. Better fuel savings are also possible with rubberisation. Thus the extra expenditure required for rubberisation is more than compensated.


CONCLUSION

Addition of rubber in any form to bitumen produces favourable changes in the properties of bitumen. It is found that rubberised bitumen was able to overcome the disadvantages of conventional bitumen roads, which melt during summer and become brittle during winter. Conclusions drawn from the present study are:
 
The roads surfaced with NRMB provide atleast 50% more service life than normal bitumen roads.
Reduction in the road maintenance cost by 30%.
Enhances tyre rolling and save fuel by 10%.
Reduces traffic noise pollution.
More comfort riding.
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18-10-2010, 02:46 PM



RUBBERISATION OF ROADS

The use of bitumen modified using polymeric materials like natural rubber, synthetic rubbers and plastic etc. have helped to a great extends in improving the quality of roads. Bitumen thus modified employing polymers are known as Polymer Modified Bitumen (PMB). Out of these Natural Rubber Modified Bitumen (NRMB) is widely used in road construction which is obtained by adding natural rubber latex to boiling bitumen.
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nipungupta
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08-02-2011, 09:14 PM

please give me some info about bubberised bitumen for road works
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saine dash
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26-02-2011, 08:08 PM

BlushUndecidedShyTongueangel:
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muhasinct
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20-07-2011, 08:19 PM

i want their report.please send to me.
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seminar addict
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21-07-2011, 09:45 AM

you can refer these page details of "RUBBERISED BITUMEN FOR ROAD WORKS"link bellow

topicideashow-to-rubberised-bitumen-for-road-works-full-report?pid=51829#pid51829
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vayyattu
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25-07-2011, 08:39 PM

Pls. sent me abstract and seminar and presentation report (pdf and ppt format)
forrubberised bitumen for road works.


Thanking you,

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26-07-2011, 10:01 AM

To get more information about the topic "RUBBERISED BITUMEN FOR ROAD WORKS " please refer the link below

topicideashow-to-rubberised-bitumen-for-road-works-full-report?pid=51829#pid51829
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Jisskabraham
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26-01-2012, 09:46 AM

Friends, may i get help for detailed study for rubberised bitumen i.e lab tests
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26-01-2012, 10:01 AM

to get information about the topic RUBBERISED BITUMEN FOR ROAD WORKS full report,ppt and related topic refer the link bellow

topicideashow-to-rubberised-bitumen-for-road-works-full-report

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14-08-2012, 12:59 PM

RUBBERISED BITUMEN FOR ROAD WORKS


.docx   FINAL SEMINAR REPORT OF RBFRW.docx (Size: 416.08 KB / Downloads: 55)

INTRODUCTION

Development of infrastructural facilities like road is vital for the economic growth of a country and also roadways are considered as one of the most important elements of infrastructure and they play an essential role in our daily lives. Good roads improve connectively, accessibility, mobility and productivity.
In India, it is estimated that over 33 lakh kilometers of road exists. The road transport carries close to 90% of passenger traffic and 70% of freight transport.
Over the years, road structures have deteriorated more rapidly due to increases in service traffic density, axle loading and low maintenance services. To minimize the damage of pavement surface and increase durability of flexible pavement, the conventional bitumen needs to be improved with regards to performance related properties, such as resistance to permanent deformation (rutting) and fatigue cracking and Increasing pressure by the vehicular traffic on the road is compelling highway authorities to look for high performance bitumen as such the modification of bituminous binder has been explored over the past years in order to improve road pavement performance properties.
Investigations in India and countries abroad have revealed that properties of bitumen and bituminous mixes can be improved to meet requirements of pavement with the incorporation of certain additives or blend of additives. These additives are called “Bitumen Modifiers” and the bitumen premixed with these modifiers is known as modified bitumen.

HISTORY AND PRESENT STATUS:

IN WORLD

The earliest experiments date back to the 1840s, which Involved incorporating natural rubber into bitumen to increase its engineering performance properties. The process of bitumen modification involving natural and synthetic rubber was introduced as early as 1843. Then, in 1923, natural and synthetic rubber modifications in bitumen were further improved (Isacsson and Lu 1999; Yildrim, 2007). According to the study of Yildrim (2007), the development of rubber-bitumen materials being used as joint sealers, patches and membranes began in the late 1930s. In 1950, the use of scrap tyre in asphalt
In 1960, Charlie Mac Donald working as head material engineer in Phoenix, Arizona, used ground tyre rubber as an additive in bitumen binder modification. He found that after completing the mixing of crumb rubber with the conventional bitumen and allowing it to blend for mix duration of 45 to 60 min, there were new material properties produced, which resulted in swelling in the size of the rubber particles at higher temperatures allowing for higher concentrations of liquid bitumen contents in pavement mixes (Huffman, 1980). In the mid-1980s, the Europeans began the development of newer polymers and additives for use in bitumen binder modification (Brule, 1996). In recent years, the use of crumb rubber has gained interest in pavement modification and has shown that crumb tyre rubber can improve the bitumen performance properties (Brown et al., 1997).

BINDER USED IN ROAD CONSTRUCTION

BITUMEN

Bitumen is final product that obtained when crude petroleum product is refined. Bituminous materials or asphalts are extensively used for roadway construction, primarily because of their excellent binding characteristics and water proofing properties and relatively low cost. Bituminous materials consists of bitumen which is a black or dark colored solid or viscous cementitious substances consists chiefly high molecular weight hydrocarbons derived from distillation of petroleum or natural asphalt, has adhesive properties, and is soluble in carbon disulphide. Tars are residues from the destructive distillation of organic substances such as coal, wood, or petroleum and are temperature sensitive than bitumen. Bitumen will be dissolved in petroleum oils where unlike tar.

Rubber Modified Bitumen

Proper blending of bitumen with natural rubber in a fixed proportion confers good elastic recovery to the blend. Incorporation of 2-4 per cent natural rubber into bitumen thus improves the properties of the later substantially and rubberized bitumen is found to be an excellent binder for rubble and sand. The rubberized bitumen formed minimizes permanent deformation due to overload on the road. This bitumen is unaffected by changes in atmospheric temperature and improve skid resistance due to increased aggregate retention and elimination of bleeding. Rubber increases the resistance to flow of bitumen at high temperature and improves the resistance to brittle fracture at low temperature. The above properties increase the service life of rubberized roads in many cases to more than 100% when compared to that of bituminous roads. Thus, rubberisation of roads will combine savings with safety.

Technique of rubberisation

Basically rubberized bitumen comprises of a bituminous compound into which rubber in a suitable form and proportion is incorporated using an appropriate technique. Rubberized bitumen is then used in pavings using conventional road building techniques. Following the incorporation and uniform distribution of rubber, bitumen undergoes radical changes in its properties depending to a large extent on the type and grade of rubber used, ratio of bitumen to rubber and the method of incorporation of rubber into bitumen.
It has been clearly established that for maximum effectiveness, the rubber must dissolve in the binder (bitumen). When properly incorporated, rubber increases the viscosity, strength and heat resistance of the system. Though different polymers have been tried for modification of bitumen for road works, very good results are reported in the case of Natural Rubber modified bitumen and Crumb Rubber Modified Bitumen

Natural Rubber Modified Bitumen (NRMB)

Natural Rubber is a naturally occurring polymer, and a very good one, when added to bitumen it will increase its elasticity, decrease its brittle point and increase its softening point. Natural rubber is usually added to the bitumen part of a material in the form of a liquid latex metered into the mixing drum by a pump system, or it should be.
The latex is supplied in metal drums of varying sizes according to what quantities are being used, the latex has quite a long storage life while in the sealed drums (and frost free) several months at least.
Because rubber is added to the bituminous material in this way, only as much latex is used as is needed, and means small tonnages of modified material are able to be produced at reasonable cost.When using proprietary polymer modified bitumens it is usually the case that a supplier will have to purchase at least a fifteen tonne tanker of binder, this can rule out small tonnage jobs because the cost of the modified mixture has to allow for the cost of buying the tanker load of bitumen, also pre-modified bitumen is not able to kept in storage for long periods.

Crumb Rubber Modified Bitumen (CRMB)

In recent times, a serious problem that leads to environment pollution is the abundance and the increase of waste tyre disposal. Large amounts of rubbers are used as tyres for cars and trucks. Despite the long run in service, these tyres are not discarded. Although, the rubber as a polymer is a thermosetting material cross linked to processing and moulding, however, it cannot be softened or remoulded by re-heating unlike other types of thermoplastics polymer which can be softened and reshaped when heated. The major approach to solve this issue is the recycle and reuse of waste tyre rubber and the reclaim of rubber raw materials like Crumb Rubber Modified Bitumen (CRMB).

CONCLUSION

Addition of rubber in any form to bitumen produces favourable changes in the properties of bitumen. It is found that rubberised bitumen was able to overcome the disadvantages of conventional bitumen roads, which melt during summer and become brittle during winter.


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#12
28-08-2012, 08:34 PM

sir please send me ppt on manufacture of clay bricks and concrete blocks .
my email id is deepakkrishnadeep53@gmail.com
please...
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#13
20-11-2012, 12:31 AM

what are the materials we may add other than polymers to improve the properties of bitumen
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20-11-2012, 11:21 AM

to get information about the topic "RUBBERISED BITUMEN FOR ROAD WORKS" full report ppt and related topic refer the link bellow

topicideashow-to-rubberised-bitumen-for-road-works-full-report

topicideashow-to-rubberised-bitumen-for-road-works-full-report?page=4

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