Micromechanics-Based Relaxation Property Analysis of Crumb Rubber Modified Asphalt Concrete

ICCTP 2011 ◽  
2011 ◽  
Author(s):  
Nai-sheng Guo ◽  
Chong Wang ◽  
Ying-hua Zhao
Keyword(s):  
Asphalt Concrete ◽  
Relaxation Property ◽  
Crumb Rubber ◽  
Modified Asphalt ◽  
Property Analysis

Microstructure analysis and mechanical performance of crumb rubber modified asphalt concrete using the dry process

2020 ◽  
Vol 259 ◽  
pp. 119662 ◽  
Author(s):  
Israel Rodríguez-Fernández ◽  
Farrokh Tarpoudi Baheri ◽  
Maria Chiara Cavalli ◽  
Lily D. Poulikakos ◽  
Moises Bueno
Keyword(s):  
Asphalt Concrete ◽  
Mechanical Performance ◽  
Crumb Rubber ◽  
Microstructure Analysis ◽  
Dry Process ◽  
Modified Asphalt

scholarly journals UJI MARSHALL PADA CAMPURAN ASPHALT CONCRETE BINDER COURSE (AC-BC) DENGAN TAMBAHAN PARUTAN BAN BEKAS

2018 ◽  
Vol 1 (3) ◽  
pp. 559-570
Author(s):  
Cut Khairani ◽  
Sofyan M. Saleh ◽  
Sugiarto Sugiarto
Keyword(s):  
Asphalt Concrete ◽  
Crumb Rubber ◽  
Concrete Pavement ◽  
Traffic Load ◽  
Rubber Mixture ◽  
Modified Asphalt ◽  
Asphalt Content ◽  
Substitute Material ◽  
Asphalt Concrete Pavement

Abstract : Endurance of asphalt concrete pavement on traffic load and temperature depends on the type and composition of aggregates, asphalt and filler used. Many attempts have been made to improve the quality of the mixture, such as using modified asphalt. Modified asphalt made by mixing asphalt pen. 60/70 with addition material. In this research, we used crumb rubber as an aggregate substitute material on AC-BC mixture. This study aims to determine the influence of additional substitution of used crumb rubber. The first step of the research is to find the optimum asphalt content (OAC), then add the crumb rubber as an aggregate substitute material from 0%, 1%, 2%, 3%, 4% and 5% to the weight of the mixture. The results showed that the percentage of crumb rubber influenced Marshall parameters value, especially the value of stability, VIM and VMA at 5.285% asphalt content. The highest stability value was found in the mixture of 2% crumb rubber is 1128.48 Kg. The highest VIM value is in the 5% mixture of the used crumb rubber is 16.94%. The highest VMA value is in the 5% mixture of the used crumb rubber is 27.88% and the highest flow value is in the 5% crumb rubber mixture of 4.97 mm. However, in MQ value increase and decrease that happened very big. No big changes in the density and VFA values for all substitutions of crumb rubber. For the durability value of AC-BC mixture with crumb rubber variation 90% requirement only on crumb rubber 1%.Abstrak: Ketahanan perkerasan beton aspal terhadap beban lalulintas dan temperatur sangat tergantung pada jenis dan komposisi agregat, aspal serta filler yang digunakan. Banyak usaha telah dilakukan untuk meningkatkan kualitas campuran, salah satunya dengan menggunakan aspal modifikasi. Aspal modifikasi dibuat dengan mencampur aspal pen. 60/70 dengan bahan tambah. Pada penelitian ini bahan tambah yang digunakan adalah parutan ban karet bekas sebagai bahan pengganti agregat pada campuran AC-BC. Penelitian ini bertujuan untuk mengetahui pengaruh substitusi tambahan ban karet bekas sebagai bahan pengganti agregat. Tahapan awal penelitian adalah mencari Kadar Aspal Optimum (KAO), kemudian dilakukan penambahan parutan ban karet bekas sebagai bahan pengganti agregat mulai dari 0%, 1%, 2%, 3%, 4% dan 5% terhadap berat campuran. Dari hasil penelitian menunjukkan penambahan persentase parutan ban bekas mempengaruhi nilai parameter Marshall, terutama nilai stabilitas, VIM dan VMA pada kadar aspal 5,285%. Nilai stabilitas tertinggi didapat pada campuran 2% parutan ban bekas yaitu 1128,48 Kg. Nilai VIM tertinggi ada pada campuran 5% parutan ban bekas yaitu 16,94%. Nilai VMA tertinggi ada pada campuran 5% parutan ban bekas yaitu 27,88% dan nilai flow tertinggi ada pada campuran 5% parutan ban bekas yaitu 4,97 mm. Namun pada nilai MQ kenaikan dan penurunan yang terjadi sangat besar. Nilai Density dan VFA tidak terjadi perubahan yang besar untuk semua substitusi variasi parutan ban. Untuk nilai durabilitas campuran AC-BC dengan variasi parutan ban yang memenuhi persyaratan 90% hanya pada pemakaian parutan ban 1%.

Study on the Piezoresistivity Character of Electrically Conductive Asphalt Concrete

2011 ◽  
Vol 233-235 ◽  
pp. 1756-1761 ◽  
Author(s):  
Xiao Ming Liu ◽  
Shao Peng Wu
Keyword(s):  
Asphalt Concrete ◽  
Raw Materials ◽  
Great Influence ◽  
Graphite Powder ◽  
Crumb Rubber ◽  
Highway Traffic ◽  
Electrically Conductive ◽  
Intelligent Monitoring ◽  
Modified Asphalt ◽  
Sbs Modified Asphalt

Raw materials, such as SBS modified asphalt, graphite powder and crumb rubber were selected to blend with aggregate mixture to product electrically conductive asphalt concrete. Experimental results demonstrated the stress or strain had a great influence on the resistance of conductive asphalt concrete, which exhibited sensitive piezoresistivity. In fact, the piezoresistivity reflects the change in microstructure. The reason for piezoresistivity may involve proximity effect, microcrack and the dislocation of conductive paths due to shear strength of aggregates. With further study on the variation of the resistance, it is hopeful to explore the microstructure change of asphalt concrete under dynamic compressive stress. Therefore this new-style asphalt concrete has extensively practical foreground in fatigue damage testing, highway traffic intelligent monitoring and so on.

scholarly journals Material Properties and Environmental Benefits of Hot-Mix Asphalt Mixes Including Local Crumb Rubber Obtained from Scrap Tires

Environments ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 47
Author(s):  
Lim Min Khiong ◽  
Md. Safiuddin ◽  
Mohammad Abdul Mannan ◽  
Resdiansyah
Keyword(s):  
Asphalt Binder ◽  
Crumb Rubber ◽  
Environmental Benefits ◽  
Asphalt Binders ◽  
Rubber Content ◽  
Scrap Tires ◽  
Asphalt Mixes ◽  
Temperature Resistance ◽  
Modified Asphalt ◽  
Marshall Stability

This paper presents the results of a laboratory-based experimental investigation on the properties of asphalt binder and hot-mix asphalt (HMA) mixes modified by locally available crumb rubber, which was used as a partial replacement of asphalt by weight. In this study, fine crumb rubber with a particle size in the range of 0.3–0.6 mm, obtained from scrap tires, was added to the asphalt binder through the wet process. Crumb rubber contents of 5%, 10%, 15%, and 19% by weight of asphalt were added to the virgin binder in order to prepare the modified asphalt binder samples, while the unmodified asphalt binder was used as the control sample. The crumb rubber modified binder samples were examined for measuring viscosity indirectly using the penetration test, and temperature resistance using the softening point test. Later, both the modified and unmodified asphalt binders were used to produce HMA mixes. Two categories of HMA mix commonly used in Malaysia—namely, AC 14 (dense-graded) and SMA 14 (gap-graded)—were produced using the modified asphalt binders containing 5%, 10%, 15%, and 19% crumb rubber. Two AC 14 and SMA 14 control mixes were also produced, incorporating the unmodified asphalt binder (0% crumb rubber). All of the AC 14 and SMA 14 asphalt mixes were examined in order to determine their volumetric properties, such as bulk density, voids in total mix (VTM), voids in mineral aggregate (VMA), and voids filled with asphalt (VFA). In addition, the Marshall stability, Marshall flow, and stiffness of all of the AC 14 and SMA 14 mixes were determined. Test results indicated that the modified asphalt binders possessed higher viscosity and temperature resistance than the unmodified asphalt binder. The viscosity and temperature resistance of the asphalt binders increased with the increase in their crumb rubber content. The increased crumb rubber content also led to improvements in the volumetric properties (bulk density, VTM, VMA, and VFA) of the AC 14 and SMA 14 mixes. In addition, the performance characteristics of the AC 14 and SMA 14 mixes—such as Marshall stability, Marshall flow, and stiffness—increased with the increase in crumb rubber content. However, the AC 14 mixes performed much better than the SMA 14 mixes. The overall research findings suggest that crumb rubber can be used to produce durable and sustainable HMA mixes, with manifold environmental benefits, for use in flexible pavements carrying the heavy traffic load of highways.

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