Jurnal Teknologi Full Paper WORKABILITY AND RHEOLOGICAL PROPERTIES OF EVA-MODIFIED BITUMEN COMPARED WITH PG 76 BINDER (original) (raw)
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Rheological properties and stability of ethylene vinyl acetate polymer‐modified bitumen
Polymer Engineering & Science, 2013
Polymers are commonly used to improve the properties of bitumen (BIT) as a binder for asphalt. Polymers improve the temperature susceptibility of BIT by increasing its stiffness at high service temperatures and by reducing its stiffness at low service temperatures. The addition of polymers as BIT modifiers contributes to the BIT viscoelasticity. The aim of this article was to study the effect of the addition of ethylene vinyl acetate (EVA) copolymer on the morphology, rheological, and physical properties before and after aging. The influence of EVA contents on rheological and physical properties which are included in conventional tests before and after aging was investigated. The results indicated that the rheological and physical properties as well as the morphology of polymer‐modified bitumen (PMB) depended on the polymer content. The rheological properties of road BIT were improved by means of EVA polymer modification as proven by conventional tests, the rheological parameters G*...
Rheological evaluation of ethylene vinyl acetate polymer modified bitumens
Construction and Building Materials, 2002
The morphological, thermal and fundamental rheological characteristics of ethylene vinyl acetate (EVA) copolymer modified bitumens are studied in this paper. Nine plastomeric EVA polymer modified bitumens (PMBs) have been produced by laboratory mixing bitumen from three sources with an EVA copolymer at three polymer contents. The morphology, thermal properties and rheological characteristics of the EVA PMBs have been analysed using fluorescent microscopy, differential scanning calorometry and dynamic mechanical analysis using a dynamic shear rheometer, respectively. The results of the investigation indicate that EVA polymer modification increases binder stiffness and elasticity at high service temperatures and low loading frequencies with the degree of modification being a function of bitumen source, bitumen-polymer compatibility and polymer concentration. Filler type modification is evident at low temperatures, temperatures above the melting temperature of the semi-crystalline EVA copolymer and for those modified binders that do not exhibit a dominant polymer network. ᮊ
Thermo-rheological behavior of modified bitumens adding virgin and waste polymers
The use of recycled polymers for replacing virgin polymers has been employed in the road building contributing to asphalt performance and lower environmental pollution. In this work the copolymers ethylene vinyl acetate (EVA) and a recycled EVA copolymer from industry (EVAR) were used as modifying agents of the Brazilian bitumen. Other additive as a cashew nut shell liquid (CNSL) was also added in order to evaluate its use as bitumen modifiers. The rheological properties of the modified binders were analyzed by means of dynamic shear rheometer (DSR) and accelerated ageing experiment (RTFOT). Differently to the original the modified binders showed non-Newtonian behavior. The results obtained reveal that EVAR can be considered as an interesting substitute of EVA not only as a mean of effecting improvement but also from an economic and environmental point of view. The use of the original EVA and EVAR waste polymers helped to improve the aging resistance. The rutting factor (G*/sin δ) suggest that the polymers and waste can improve the elasticity of the asphalt. The activation energy of the viscous flux (Ef) for the samples oscillated between 58 and 70 KJ/mo land showed that the additive CNSL can reduce the viscosity and thermal susceptibility of the modified binder.
International Journal of Innovative Research in Engineering & Management (IJIREM), 2023
Bitumen is often used in the building of flexible pavements in the capacity of a binder. In the current investigation, it is suggested that the characteristics of bitumen might be improved by modifying it with EVA polymer. The useful life of pavements may be shortened as a consequence of rutting. In the event that the rutting depth is very severe, water may pool in the pavement area, which may cause vehicles to hydroplane. The results of a bending beam rheometer test (BBR) for creep stiffness at lower temperatures indicate that the creep stiffness of modified bitumen was lowered, while the mvalue was enhanced. The in-situ polymer modified binders that were produced demonstrated significantly reduced stiffness and satisfied the required parameters up to a temperature of-18 degrees Celsius.
Science Progress
Major distresses such as rutting, fatigue, and thermal cracking are facing asphalt pavement structures due to continuous heavy traffic loading and climate change. The modification of asphalt binders (one of the main components of the asphalt paving mix) has the potential to mitigate distresses through using different additives. Polymer modified asphalt (PMA) binders showed a noticeable resistance to pavement distresses as reported in previous studies. The present study aims to evaluate the effect of polymer modification on the rheological properties of asphalt binders through laboratory tests. The polymers included styrene-butadiene-styrene (SBS) and epolene emulsifiable (EE2) types. The 60/70 binder was used as a control for comparison. The Mechanistic-Empirical Pavement Design Guide (MEPDG) was also utilized to simulate the effect of PMA binders on the rheological properties under different climatic conditions and structural capacities. Additionally, the MEPDG was further utilized...
Performance of Polymer Modified Bitumen for Flexible Pavements
2012
Flexible pavements with bituminous surfacing are widely used in India. Exponential increase in traffic, overloading of commercial vehicles and significant variations in daily and seasonal temperatures have shown some limitations of conventional bitumen performance. Early developments of distress symptoms like cracking, rutting, ravelling, undulations, shoving and potholing of bituminous surfacing have been reported for flexible pavements. A bituminous mixture needs to be flexible enough at low service temperatures to prevent pavement cracking and to be stiff enough at high service temperature to prevent rutting. Bitumen modified with polymer offers a combination of performance related benefits as the physical properties of the bitumen is improved without changing the chemical nature of it. This paper presents the experimental study carried out conventional bitumen and polymer modified binder. It has been shown that rutting resistance, indirect tensile strength and resilient modulus ...
Rheological Properties of Plastic Modified Bitumen for Sub-Tropical Areas of Ethiopia
2018
The principal problems in any asphalt pavement performance are the sensitivity of bitumen towards temperature, loading time and climate in asphalt mixture. In Ethiopia, asphalt binders have been selected based on penetration grade at 25°C for the construction of all road pavements. Daily traffic growth, performance of dense graded asphalt (DGA), maintenance and rehabilitation expenditure demand better, life-long, and high efficient alternative asphalt mastics and mixtures for minimizing pavement distress. The objective of this research is to evaluate the performance of plastic modified bitumen for sub-tropical areas of Ethiopia. The effect of temperature on strain (deformation) were investigated on the rheology of two commonly used bitumens (40/50 and 85/100) in Ethiopia. In addition, the rheological properties of 40/50, 85/100, polyvinyl chloride (PVC) modified 40/50, low density polyethylene (LDPE) modified 40/50, PVC modified 85/100 and LDPE modified 85/100 binders were investiga...
Rheologica acta, 2005
Asphalt binder was modified by low density polyethylene (LDPE) and ethyl vinyl acetate (EVA) polymers to investigate the structure-property relationships of polymer modified asphalt (PMA). The PMA was prepared in a high shear blender at 160 o C. The optimum blending time (OBT) for each polymer was determined following a separate investigation. OBT was influenced by Mw, MWD, and polymer structure. The influence of Mw of LDPE and vinyl acetate (VA) content of EVA on PMAs was studied by rheological tools. Polymer modification improved the rheological properties of base asphalt. EVA PMAs were found to be less temperature sensitive than LDPE modified asphalts. LDPE modification increased flow activation energy (E a ) but EVA modification decreased E a . Both VA content and Mw of LDPE have influenced the storage stability of PMAs. The low temperature properties of PMAs and short ageing tests were not influenced by polymer type. On the other hand, the high temperature properties of PMAs were strongly influenced by Mw of LDPE and VA content of EVA. Overall, EVA with low VA content showed the best temperature resistance to high temperature deformations, the highest upper service temperature as well as the best storage stability.
Evaluating Physical, Rheological and Chemical Properties of Modified Bitumen
Bonfring
In India, the methods for rheological characterization of bituminous binders are inadequate to characterize the bitumen. Hence a complete rheological study and characterization of bitumen using dynamic shear rheometer would be helpful. Also there is limited insight about the chemistry of modified bitumen. Modification of asphalt binders can serve several purposes. It can increase the overall performance of a binder by widening the range between the binder?s high and low-temperature grades. In this paper VG30 bitumen and two polymers: Styrene Butadiene Styrene (SBS) block copolymer and Ethylene Vinyl Acetate (EVA) polymers were used as modifiers. SBS copolymers derive their strength and elasticity from physical and cross linking of molecules into three dimensional networks. Increasing the SBS content results in increased polymer swelling, which in turn produces increase in asphaltenes and reduction in maltene content resulting in harder and viscous matrix whereas EVA modifies bitumen by forming tough, three dimensional, rigid network to resist deformation. The change in physical properties such as penetration, softening point, penetration index and mass loss were studied and compared before and after modification. Rheological parameters such as complex modulus and phase angle before and after modification were studied by using Dynamic Shear Rheometer. The results indicate that polymer modification leads to decrease in penetration value, and increase in softening point and rutting parameter (G*/Sinδ). Modifiers used for bitumen modification are normally polymeric materials which have different structures such as atactic, isotactic and syndiotactic. These structures give characteristic features in spectroscopy analysis. Thus, Infra Red Spectroscopy techniques was employed in identifying the structure and functional groups present in polymeric materials.