An overview of crumb rubber modified asphalt (original) (raw)
Related papers
Investigation of Crumb Rubber Modification on the Performance of Bitumen and Asphalt Mixtures
The performance of flexible pavements is greatly influenced by rutting, fatigue, and durability. The limitations of traditional bitumen in flexible asphalt pavements are due to the significant rise in traffic loads and volumes. The reason for incorporating tire waste into bitumen is its incredible qualities and economical price as a bitumen modifier. The quality of crumb rubber-modified bitumen (CRMB) mainly depends on the concentration of crumb rubber (CR) dispersed into the base bitumen. The primary target of this research is to modify the bitumen with CR to improve the thermal properties, rheology, rutting resistance, fatigue resistance, and moisture-damaged performance. The three concentrations, i.e., 5%, 10%, and 15% of CR, were prepared by dispersion in conventional 60/70 penetration grade bitumen. The consistency and mixture test results concluded that the optimum dosage of CR-10% provides appropriate thermal, rheological, rut, fatigue, and moisture-damaged performance.
Performance Review of Crumb Rubber as A Modifier in Asphalt Pavement
Progress in Engineering Application and Technology, 2021
The rising number of wheeled transportations has led to an increasing waste tire in the country. Thus, it is always experiencing pavement failure such as cracking, potholes, depression, and raveling, which bring uncomfortable feelings to road users. Therefore, the modified pavement is needed for solving these problems by adding crumb rubber to the asphalt mixture. In this study, the crumb rubber from previous studies was used to determine the performance of crumb rubber as a modifier in asphalt pavement. Six crumb rubber-modified pavement data consist of 8.00 %, 10.00 %, and 12.00 %, with the different bitumen grades (PEN 60-70, PEN 70-80, and PEN 80-100) prepared and analyzed. The laboratory testing of Penetration Test, Softening Test, and Ductility Test found the most suitable bitumen grade used in Malaysia is PEN 60-70. Besides, the Marshall Stability test and Indirect Tensile Strength test are performed and indicate that 10.00 % is the optimum percentage of crumb rubber added in the mixture. Hence, the study found that the addition of crumb rubber in asphalt pavement can improve the pavement's strength, quality, and performance.
Effect of Crumb Rubber Particles on the Properties of Asphalt
Lecture Notes in Civil Engineering, 2020
The practice of crumb rubber derived from scrap tires to modify the mechanical properties of bituminous mixtures has become increasingly important in road engineering. In recent years, much research has been devoted to the influence of this waste material on pavement performance. This paper aims to address the influence of crumb rubber (CR) polymers on the performance of asphalt pavements. Thus, asphalt mixtures with varying percentages of CR mixed by the wet process were tested. The statistical analysis revealed that crumb rubber significantly increased the stiffness modulus, rutting resistance, and pavement resistance to moisture damage. The study concludes that an addition of 20% to 24% of crumb rubber modifiers to conventional asphalt mixture yields the most satisfactory results among other percentages of CR polymers. The study recommends the use of crumb rubber in pavement construction.
2020
This research study evaluated the characteristics of crumb rubber modified (CRM) asphalt binders produced with neat bitumen. Two different percentages of crumb rubber (CR); 10 and 15% and one bitumen type with penetration (Pen) grade 60/70 were evaluated. The evaluated characteristics included viscosity, ductility, Penetration, and softening point of the produced asphalt binders. Additionally, images obtained by Scanning Electron Microscopy (SEM) were used to investigate the surface topographies and compositions of the neat and produced CRM binders. SEM images were used to check for separation between the crumb rubber and the bitumen. Furthermore, the Multiple Stress Creep Recovery (MSCR) test was conducted in order to evaluate the rheological properties of the produced CRM asphalt binders. MSCR results showed that the addition of CR to the neat bitumen significantly improved the performance grade (PG) of the produced binder as per AASHTO M332 standards. The traffic loading level fo...
Experimental Study of the Effect of Crumb Rubber on Properties of Asphalt Mix by Wet Process
E3S Web of Conferences
The increase in the number of vehicles during the past twenty years has dramatically increased the traffic density and axial loading. In addition to the construction failures and lack of periodic maintenance, rapid deterioration of the road condition happens. So, it was necessary to find solutions to these problems that have been growing for years. One of these solutions is to improve the asphalt mixture to resist excessive loads and weather fluctuations. This research aims to investigate the addition of crumb rubber derived from recycled tires; to the asphalt mixture for improving performance characteristics and to compare the improved and unimproved samples. It is worth mentioning that crumb rubber addition to the asphalt mixture is considered one of the smart solutions for sustainability that the world is heading towards today, considering that the crumb rubber comes from waste tires, which is difficult to eliminate and pollute the environment. Four different proportions of crumb...
Influence of Tire Crumb Rubber on Properties of Asphalt Binders
IOP Conference Series: Materials Science and Engineering, 2019
For many years, the asphalt binder has been used as the elemental material for pavement engineering. The increase in axle loads, heavy traffic, severe climate conditions and construction failures has led many researchers to seek some methods to enhance the bitumen properties. There is a wide range of applications of modifiers for bitumen in road construction. Although various kinds of modifiers have been used widely in reinforcing asphalt concrete, crumb rubber has attracted the most attention due to its high and desirable characteristics. It is realized that the well-distributed modifier can create a strong network in the internal structure of the composite, resulting in asphalt mastic that is more coherent. In the present paper, a laboratory investigation of the physical and rheological properties of various grades of asphalt binder (60-70 penetration grade, 80-100 penetration grade and PG-76 grade) modified with tire crumb rubber. The results showed improvement in physical proper...
Construction and Building Materials, 2008
The application of crumb rubber modifier (CRM) in asphalt mixtures is intended to improve the properties of binder by reducing the binder's inherent temperature susceptibility. During the interaction with asphalt binder, the CRM particles absorb a portion of the oils in asphalt binder and the particles swell; therefore increasing the viscosity and stiffness of the CRM binder. Still, the performance properties of CRM binders in hot mix asphalt (HMA) pavement are considered to be unclear due to the various interaction effects of CRM with asphalt binders, depending on the CRM percentage, source and size. In this study, a laboratory investigation was conducted on the properties of CRM binders as a function of CRM processing method and percentages. A total of twenty-four CRM binders (3 binder sources * 2 CRM processing methods * 4 CRM percentages) were produced and artificially aged through an accelerated aging process. Evaluation of the CRM binders included the following testing procedures: Viscosity at high temperature, performance properties at high and intermediate temperatures, and cracking properties at low temperature. The results from this study indicated that the higher CRM percentages for CRM binders seemed to lead to a higher viscosity, a better rutting resistance and a less chance for low temperature cracking. In general, the ambient CRM was found to be more effective on producing the CRM binders that are more viscous and less susceptible to rutting and cracking.
Modification of Asphalt by the Use of Crumb Rubber
Health aspects enforced to ponder a study on asphalt which incorporate rubber crumbs to increase strength and flexibility of asphalt. Disposal of waste tires is a menace and it’s a serious problem globally because it is not easily biodegradable as these tires consume large spaces, open burning cause serious problems. By the use of rubber tires, this scrap is utilized efficiently and reduces the cost of asphalt to produce economical system. The asphalt is absorbed by the rubber particles which swells at high temperature allowing greater concentration of liquid asphalt. The partial replacement of crumb rubber in asphalt is 5%, 10%, 15%, and 20% (D05, D10, D15, and D20). The analysis of incorporated asphalt was done in hot mix asphalt. The generated results showed that the value for resilient modulus and creep stiffness is more as compared to the conventional asphalt and in the accumulated strain the values are much lesser which is positive approach.
CRUMB RUBBER AS ASPHALT MODIFIER.
This study presents the properties, performance and findings on crumb rubber as asphalt modifier and accomplishes the comparison between the performances of Crumb Rubber Modified Asphalt over conventional asphalt, the rheological and mechanical performances of various mixtures evaluated by different experimental techniques. In this study it is observed that with increase in percentage of the fine CR in the mix resulted in increase of viscosity and a decrease in resilience of pavement. CR modification at high additive content exhibited higher elastic response than the styrene butadiene styrene (SBS) modified mixture. It is evident from the various researches and studies that CRM asphalt can increase high temperature stability, strengthen low temperature crack resistance, enhance water stability, durability and fatigue resistance of asphalt pavement. The use of crumb rubber in the asphalt binder has great advantages including increase in life of pavement, retarded reflection cracking and thus reducing maintenance cost of the pavement.