- Open Access
- Authors : Mehruniza K N, Megha Meenu Unni, Ann Mary Jose, Minnu P Prasad, Midhun Sethu
- Paper ID : IJERTCONV11IS02039
- Volume & Issue : Volume 11, Issue 02
- Published (First Online): 15-06-2023
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License: This work is licensed under a Creative Commons Attribution 4.0 International License
Experimental Study on Modified Bitumen Using Ldpe and Crumb Rubber
Mehruniza K N, Megha Meenu Unni Ann Mary Jose
Minnu P Prasad, Midhun Sethu Asst. Professor
Students: Dept of Civil Engineering Dept of Civil Engineering
Mangalam College of Engineering Ettumanoor Mangalam College of Engineering Ettumanoor Kottayam, Kerala, India Kottayam, Kerala, India
Abstract-Low density polyethylene (LDPE) and crumb rubber (CR), both recycled from used tyres, were combined in order to produce a plastic- elastomer admixture. For the purpose of strengthening the base bitumen binder's characteristics, two waste materialsLDPE and CRwere used. A mixture of molten bitumen and CR powder with particle sizes less than 0.7 mm was used. The weight of LDPE, CR, and an LDPE/CR combination was used in the same way to produce the various compositions. When compared to base bitumen, these modified mixtures perform better in terms of penetration, softening point, and viscosity. In 2023, 157 million tonnes of polyethylene is expected to be produced annually throughout the world. These statistics demonstrate that polyethylene is the most widely used and consumed polymer worldwide. Bitumen can be modified to improve pavement performance at a low cost and with ease of access by utilising crumb rubber. n. Since these modified bituminous binders cover aggregates better than base bitumen over base bitumen alone, it is expected that using them in pavement will result in a durable pavement surface.
Keywords: Bitumen; LDPE; Crumb rubber
The network of roads have a major role in the development of an area. The paving industry makes extensive use of bituminous binders. Mineral aggregate and bituminous binders are used to create the bituminous pavement. Due to an increase in traffic volume, conventional binders cannot maintain asphaltic pavement's present performance standards. Bitumen is modified using crumb rubber and low density polyethylene. The study analyses the usage of crumb rubber and low density polyethylene (LDPE) for bitumen modification.
Today, disposing of plastic garbage has become a major issue. Its improper disposal results in issues including water pollution and soil pollution. The
mechanical properties of bitumen can be significantly modified by adding polymers, which can modify it. These non-biodegradable materials are utilised in bituminous pavements. In highways, bituminous mixes considerably improve the stability, strength, fatigue life, and other desired
.features of bituminous concrete mix, even under unfavourable conditions of water logging. As a result, compared to the use of regular bitumen, it is expected that the life of the pavement surfacing course using the modified bitumen will also significantly increase. By shredding remaining plastic items from daily life, plastic pellets are created. The difficulties with pollution and disposal can be effectively solved by using these materials in the construction of highway roads. Crumb rubber is the substance that results when worn tyres are properly crushed.
According to Professor Lokesh Kumar's 2022 study, "Effect of LDPE/CR admixture on the properties of bituminous binder used in paving applications," using modified bituminous binders that include Low Density Polyethylene (LDPE) and crumb rubber in pavement ends in a durable pavement surface due to these modified binders coat aggregates and gravel better than base bitumen does. According to the study, pavement built with this modified bituminous binder performs better in terms of durability, resistance to rutting and cracking, temperature sensitivity, and fatigue resistance.
A comprehensive evaluation of binder is done by Angelo Filonzi, Satyavati Komaragiri, K Lakshmi Roja, and Anand Sreeram (2021). The main goal of this research was to assess LDPE's potential as a modifier for use in asphalt mixtures. The rheological and performance-related
characteristics of two very distinct types of asphalt binders, as well as asphalt mixtures made with a subset of these binders, were thoroughly assessed for this study.
Deven Ramole and Rutuja Sathe Utilisation of Crumb Rubber in Flexible Pavements" (2020) Due to wetness, heat, and axle load, bituminous pavement is poorly resistant. Modified bitumen, which is created by combining bitumen and crumb rubber, is the answer. There are two ways to combine tyres with bitumen: dry process and wet process.
Researchers Haopeng Wang, Xueyan Liu, Sandra Erkens, and Athanasios Skarpas (2020) "Experimental characterization of storage stability of crumb rubber modified bitumen with warm-mix additives" The problem with storage stability is one of the main downsides of crumb rubber modified bitumen (CRMB). CRMB's inability to store consistently prevents future applicability. The goal of this research is to create a reliable method for testing the morphological and mechanical stability of CRMB binders during storage.
The bitumen used for the present research work was VG30 grade and the modifiers used for the experiment are LDPE and Crumb rubber having size less than 7 mm. Recycled LDPE and crumb rubber is used for the experiment.VG30 bitumen is mainly used in the construction of heavy duty roads. By keeping the amount of LDPE constant different ratio of crumb rubber is added to the bitumen and values on each addition is identified. Properties of bitumen is changed on different ratios of LDPE and crumb rubber.
TABLE1. Properties of VG30 Bitumen
For the preparation of test sample 500 gm of VG30 bitumen is taken in a steel vessel. The bitumen is heated at 1600-1700C until it turn into loose consistency. To this bitumen LDPE is added and stir well at the same temperature. Two ratios of LDPE and crumb rubber 1:2 and 1:3 are prepared.
The softening point of bitumen is determined by using ring and ball method. In this test, disks of specimen were cast in shouldered ring. The temperature at which bitumen softens to a given degree under the test's predetermined parameters is known as the softening point. The device is submerged in USP glycerin (above 80 to 157Â°C) or distilled water (30 to 80Â°C).
An indirect method of determining high temperature viscosity and low temperature stiffness is the penetration test. The penetration value, which measures the consistency or hardness of bituminous material, is a measure of consistency known as penetration. It is the vertical distance that a conventional needle can penetrate into a bituminous material under particular load, time, and temperature circumstances. One tenth of a millimetre is used to measure this distance.
A viscometer was applied to measure the viscosity of the bitumen test. This test evaluates the resistance to flow or helps assess if the modified bitumen has an adequate amount of workable fluidity. The aim of a viscosity test is to obtain data on a material's viscosity that will enable manufacturers to forecast how the material will behave in the real world. Viscosity acts as a representation of significant resistance to the compacion done by rolling equipment during construction and by traffic in service in the case of roads.
The bitumen ductility test will be used to assess the ductility of a particular bitumen sample and the acceptability of bitumen for use in road building. The goal of the ductility test is to provide a useful and practical method to assess a specimen's capacity for plastic deformation before breaking. You will be able to apply it to a wide range of materials and discover where each material bends or fractures.
RESULT AND DISCUSSION
For the modification of base bitumen crumb rubber and low density polyethylene having size less than
mm is used for the study. The admixtures of LDPE/CR is used in the form of concentrate in order
to improve the mechanical and rheological properties of base bitumen. This modified bituminous binders is used in pavement, it is expected that these produce a durable pavement surface. The pavement are made by these modified binders could serve for a long time.
TEST ON PLAIN BITUMEN
TABLE 2. Test Result of Plain Bitumen
TABLE 5. Softening point value
The obtained value of bitumen tests such as penetration, softening point, ductility and viscosity are within the specified limit.
TEST ON BITUMEN + 5% LDPE
TABLE 3. Test result of bitumen+5% LDPE
TABLE 6. Ductility value
TABLE 7. Viscosity value
TEST ON MODIFIED BITUMEN
TABLE 4. Penetration value
Based on the experimental study, the change in the properties of base bitumen by the addition of crumb
rubber and Low Density Polyethylene (LDPE) is identified. For conducting the experiment firstly the base bitumen is tested for identifying the standard values. 5% of LDPE is added to the bitumen sample and its values are calculated. The modified bitumen is prepared by adding two different ratio of crumb rubber into the bitumen and LDPE mixture. The ratio of 1:2 and 1:3 are prepared for conducting the experiment.
After conducting test the penetration value is decreases for 1:3. The softening point value is lesser for 1:3 ratio as compared to 1:2 ratio. The ductility value is high for 1:2 ratio. Viscosity value is greater for 1:2 as compared to 1:3 ratio.
In this study recycled materials such as crumb rubber and Low Density Polyethylene is used for the modification of the VG30 bitumen. Two ratios are examined. After conducting the experiment it is identified that the VG30 bitumen modified with LDPE:Crumb rubber as 1:2 is more suitable than the 1:3 ratio. By adding components in 1:2 ratio the properties of bitumen is changed and the durability of the pavement is increases. The construction cost and maintenance cost are also reduces as it has a change in its physical properties.
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