Assessment of Crumb Rubber Stone Mastic Asphalt potential to be used in Angola

Recently, crumb rubber (CR) obtained from waste tires and Fischer–Tropsch paraffin are mostly used in bitumen modification to improve the performance of bituminous mixtures. Each of these additives affects the different properties of mixtures. There are limited studies in the literature about the combined usage of additive in the same mixture to utilize the different characteristics. In this study, the stability, stiffness, fatigue resistance, permanent deformation resistance, and moisture susceptibility characteristics of the stone mastic asphalt prepared with the bitumen modified with CR and paraffin were examined and compared with the control mixture. It was determined that CR-modified mixtures showed significantly more elastic characteristics. The mixture in which the 10% CR and 3% paraffin were used together gave better results in terms of moisture susceptibility and fatigue resistance when compared with the control mixture. It was determined that the use of paraffin together with CR contributed to the improved performance, and was in accordance with the CR in terms of mechanical characteristics of stone mastic asphalt.

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Stone mastic asphalt (SMA) with crumb rubber according to a new dry-hybrid technology: A laboratory and trial field evaluation

Construction and Building Materials ◽

10.1016/j.conbuildmat.2018.06.128 ◽

2018 ◽

Vol 182 ◽

pp. 200-209 ◽

Cited By ~ 21

Author(s):

Cesare Sangiorgi ◽

Piergiorgio Tataranni ◽

Andrea Simone ◽

Valeria Vignali ◽

Claudio Lantieri ◽

...

Keyword(s):

Field Evaluation ◽

Crumb Rubber ◽

Hybrid Technology ◽

Mastic Asphalt ◽

Trial Field ◽

Stone Mastic Asphalt

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Effect of Addition of Rubber Granulate and Type of Modified Binder on the Viscoelastic Properties of Stone Mastic Asphalt Reducing Tire/Road Noise (SMA LA)

Materials ◽

10.3390/ma13163446 ◽

2020 ◽

Vol 13 (16) ◽

pp. 3446

Author(s):

Wladyslaw Gardziejczyk ◽

Andrzej Plewa ◽

Raman Pakholak

Keyword(s):

Viscoelastic Properties ◽

Asphalt Mixture ◽

Crumb Rubber ◽

Low Noise ◽

Asphalt Mixtures ◽

Compression Tests ◽

Road Noise ◽

Stiffness Modulus ◽

Mastic Asphalt ◽

Stone Mastic Asphalt

The use of rubber granulate in the composition of asphalt mixtures, as well as the use of poroelastic layers, is indicated by many research centers as a factor with a positive effect on tire/road noise reduction. Attention is however paid to their lower structural durability compared to asphalt concrete (AC) or stone mastic asphalt (SMA). Stone mastic asphalt reducing tire/road noise (SMA LA) layers have also been recently used as low-noise road surfaces. The article presents the test results of viscoelastic properties of asphalt mixtures SMA8 LA, SMA8 LA containing 10%, 20%, and 30% of rubber granulate, with bitumen 50/70, bitumen 50/70 modified with styrene butadiene styrene (SBS) copolymer, crumb rubber, and mixtures with bitumen modified simultaneously with crumb rubber and SBS copolymer. The reference asphalt mixture was the porous asphalt (PA8). The presented results of water damage resistance, degradation resistance in the Cantabro abrasion loss test, stiffness modulus as a function of temperature and hysteresis loop proved that the amount of rubber granulate and the type of binder significantly affect the values of these parameters. Attention was paid to the possibility of using the results of uniaxial cyclic compression tests when determining the proportion of rubber granulate in SMA8 LA mixtures. Tests of hysteresis loops and stiffness modulus confirm much higher elasticity of SMA8 LA mixtures with rubber granulate as compared to mixtures without the addition of granulate.

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Performance Evaluation of Crumb Rubber Modified Stone Mastic Asphalt Pavement in Malaysia

Advances in Materials Science and Engineering ◽

10.1155/2013/304676 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 14

Author(s):

Nuha Salim Mashaan ◽

Asim H. Ali ◽

Suhana Koting ◽

Mohamed Rehan Karim

Keyword(s):

Resilient Modulus ◽

Asphalt Pavement ◽

Maximum Level ◽

Crumb Rubber ◽

Asphalt Mixtures ◽

Modified Asphalt ◽

Mastic Asphalt ◽

Stiffness Properties ◽

Stone Mastic Asphalt ◽

Pavement Distresses

To prevent pavement distresses there are various solutions such as adopting new mix designs or utilisation of asphalt additives. The primary aim of this study was to investigate the effect of adding crumb tyre rubber as an additive to SMA mixture performance properties. This study investigated the essential aspects of modified asphalt mixtures in order to better understand the influence of CRM modifiers on volumetric, mechanical, and stiffness properties of SMA mixture. In this study, virgin bitumen 80/100 penetration grade was used, modified with crumb rubber (CRM) at five different modification levels, namely, 6%, 12%, 16%, and 20%, respectively, by weight of the bitumen. The appropriate amount of the added CRM was found to be 12% by weight of bitumen. This percentage results in the maximum level of stability. The resilient modulus (Mr) of modified SMA samples including different percentages of CRM was obviously higher in comparison with that of unmodified samples.

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Note on structural strength of asphalt rubber concrete developed through the stone mastic asphalt concept

Canadian Journal of Civil Engineering ◽

10.1139/l96-031 ◽

1996 ◽

Vol 23 (1) ◽

pp. 295-301

Author(s):

Otto Svec ◽

Robert Veizer

Keyword(s):

Asphalt Concrete ◽

High Performance ◽

The United States ◽

Crumb Rubber ◽

Mastic Asphalt ◽

Surface Transportation ◽

Stone Mastic Asphalt ◽

Differential Frost Heave ◽

Rubber Concrete ◽

Better Than

One serious environmental problem related to the transportation field is the stockpiling of old rubber tires. Several huge fires of old tires have already occurred in Canada and the United States and have caused considerable air and possibly soil pollution. Therefore it is of paramount importance to develop techniques to recycle this potentially valuable material, such as by incorporating it into asphalt concrete. The focus of current research at the Centre for Surface Transportation Technology has been to develop a high-performance rubber asphalt concrete based on the stone mastic asphalt (SMA) concept which will be flexible enough (yet strong enough) to resist differential frost heave along roadways better than standard hot-mixed asphalt. Results indicate that a special mix has been successfully developed based on the SMA aggregate concept in which all components, including 0%, 5%, 10%, 15%, and 20% of small rubber crumbs content (based on bitumen weight), are properly sized and designed. Key words: stone mastic asphalt, crumb rubber, laboratory testing, mix design.

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Design of a crumb rubber modified asphalt pavement using the stone mastic asphalt concept.

10.22215/etd/1994-09818 ◽

1994 ◽

Author(s):

Robert Veizer

Keyword(s):

Asphalt Pavement ◽

Crumb Rubber ◽

Modified Asphalt ◽

Mastic Asphalt ◽

Stone Mastic Asphalt

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Dynamic Properties and Fatigue Life of Stone Mastic Asphalt Mixtures Reinforced with Waste Tyre Rubber

Advances in Materials Science and Engineering ◽

10.1155/2013/319259 ◽

2013 ◽

Vol 2013 ◽

pp. 1-9 ◽

Cited By ~ 9

Author(s):

Nuha Salim Mashaan ◽

Asim H. Ali ◽

Suhana Koting ◽

Mohamed Rehan Karim

Keyword(s):

Dynamic Properties ◽

Crumb Rubber ◽

Fatigue Properties ◽

Stiffness Modulus ◽

Mastic Asphalt ◽

Road Pavement ◽

Stone Mastic Asphalt ◽

Indirect Tensile ◽

Waste Tyre ◽

Waste Polymer

Today, virgin polymer modified asphalt mixes are comparatively more expensive for road pavement. One way to reduce the expense of such construction and to make it more convenient is the application of inexpensive polymer, such as waste polymer. The primary aim of this study was to investigate the effect of adding waste tyre rubber (crumb rubber modifier (CRM)) on the stiffness and fatigue properties of stone mastic asphalt (SMA) mixtures. Various percentages of waste CRM with size of 0.60 mm were added to SMA mixtures. Indirect tensile stiffness modulus test was conducted at temperatures of 5, 25, and 40°C. Indirect tensile fatigue test was conducted at three different stress levels (2000, 2500, and 3000 N). The results show that the stiffness modulus of reinforced SMA samples containing various contents of CRM is significantly high in comparison with that of nonreinforced samples, and the stiffness modulus of reinforced samples is in fact less severely affected by the increased temperature compared to the nonreinforced samples. Further, the results show that CRM reinforced SMA mixtures exhibit significantly higher fatigue lives compared to the nonreinforced mixtures help in and promotion of sustainable technology by recycling of waste materials in much economical and environmental-friendly manner.

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