Study on Preparation Process of SBS / Crumb Rubber Composite Modified Asphalt

2012 ◽  
Vol 450-451 ◽  
pp. 417-422 ◽  
Author(s):  
Yan Wang ◽  
Bo Chuan Zhan ◽  
Jian Cheng
Keyword(s):  
Crumb Rubber ◽  
Preparation Condition ◽  
Preparation Process ◽  
Preparation Temperature ◽  
Modified Asphalt ◽  
Road Pavement ◽  
Rubber Composite ◽  
Polymer Modified Asphalt ◽  
Styrene Butadiene

The incorporation of SBS into crumb rubber modified asphalt is investigated to enhance binder properties and storage stability in this paper. In order to gain the high quality of road pavement asphalt, the preparation process is optimized. The main objective of this study is to enhance the properties of crumb rubber modified asphalt through the addition of Styrene-Butadiene-Styrene (SBS) and analysis the effect of SBS type, preparation temperature and time exert on the properties of SBS /crumb rubber composite modified asphalt. The optimal preparation condition as follow: the swelling temperature for two mixed modifiers: 180 °C, swelling time: 1h; Shearing temperature: 180 °C, shearing time: 1h; Breeding temperature: 170 °C, breeding time: 3h. The results demonstrated that the properties of SBS/crumb rubber composite modified asphalt can meet the requirements of Grade C standard on SBS polymer modified asphalt.

scholarly journals Enhanced Storage Stability of Different Polymer Modified Asphalt Binders through Nano-Montmorillonite Modification

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 641 ◽  
Author(s):  
Zhibin Ren ◽  
Yongqiang Zhu ◽  
Qi Wu ◽  
Minye Zhu ◽  
Feng Guo ◽  
...  
Keyword(s):  
Storage Stability ◽  
Crumb Rubber ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Widespread Application ◽  
Remarkable Effect ◽  
Modified Asphalt ◽  
Positive Effects ◽  
Polymer Modified Asphalt ◽  
Styrene Butadiene

The storage stability concern, caused by phase separation for the density difference between polymers and asphalt fractions, has limited the widespread application of polymer modified asphalt (PMA). Therefore, this study aims to improve the storage concern of PMA by incorporating nano-montmorillonite. To this end, different nano-montmorillonites were incorporated to three PMAs modified with three typical asphalt modifiers, i.e., crumb rubber (CRM), styrene–butadiene-rubber (SBR) and styrene–butadiene-styrene (SBS). A series of laboratory tests were performed to evaluate the storage stability and rheological properties of PMA binders with nano-montmorillonite. As a consequence, the incorporation of nano-montmorillonite exhibited a remarkable effect on enhancing the storage stability of the CRM modified binder, but limited positive effects for the SBR and SBS modified binders. The layered nano-montmorillonite transformed to intercalated or exfoliated structures after interaction with asphalt fractions, providing superior storage stability. Among selected nano-montmorillonites, the pure montmorillonite with Hydroxyl organic ammonium performed the best on enhancing storage stability of PMA. This paper suggests that nano-montmorillonite is a promising modifier to alleviate the storage stability concern for asphalt with polymer modifiers.

Behavior of Carbon Nano-Tubes (CNTs) as Modifier to Resist Aging and Moisture Damage in Asphalt

2020 ◽  
Vol 10 ◽  
Author(s):  
Md Arifuzzaman ◽  
R. A. Tarefder ◽  
Muhammad Saiful Islam
Keyword(s):  
Asphalt Binder ◽  
Moisture Damage ◽  
Crumb Rubber ◽  
Outdoor Environment ◽  
Adhesion Forces ◽  
Modified Asphalt ◽  
Road Pavement ◽  
Carbon Nano Tubes ◽  
Styrene Butadiene ◽  
Sbs Modified Asphalt

Background: Moisture damage and aging take place together in asphalt binder as it is on road-pavement in service life and therefore quite difficult to overcome. Various techniques, such as crumb rubber, fibres, etc., have been applied to improve the behaviour of asphalt materials Use of nano materials was found as one of the effective techniques to develop temperature performances of asphalt binder. Methods: This study investigated moisture damage and aging of asphalt binder mixing with the carbon nano tubes (CNTs) using Atomic Force Microscopy (AFM). The base binder was primarily modified with 4% SBS polymer. Later on, CNTs were mixied in different percentages (i.e., 0.5%, 1%, and 1.5%) by weight with the 4% styrene–butadiene–styrene (SBS) modified binders. A special functionalized (-NH3) AFM probe with spring constant 3.44 N/m was utilised to complete the study. Results: The results were compared with 4% SBS modified asphalt with and without CNT addition.The adhesion forces of dry samples were found smaller as compared to wet and aged asphalt samples of with and without CNT. However, the adhesion forces of wet and aged samples with investigated percentage of CNT performed considerably better than those without CNT. Conclusion: This result clearly indicated significant improvement of asphalt to overcome moisture damage and aging owing to exposure in outdoor environment as a paving material. This study recommends any dosage (i.e., 0.5 to 1.5% by weight) of CNT with 4% SBS modified asphalt to resist moisture damage and aging in field.

Quantitative Analysis of Polymers and Crumb Rubber in Hot-Mix Asphalts

1997 ◽  
Vol 1586 (1) ◽  
pp. 57-67 ◽  
Author(s):  
Mei Ling ◽  
Christine W. Curtis ◽  
Douglas I. Hanson ◽  
James N. Hool
Keyword(s):  
Crumb Rubber ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Polymer Content ◽  
Calibration Line ◽  
Ftir Analysis ◽  
Modified Asphalt ◽  
Individual Calibration ◽  
Polymer Modified Asphalt ◽  
Styrene Butadiene

A method was developed to analyze quantitatively the amount of polymer in polymer-modified hot-mix asphalts (HMA). The polymers used were styrene-butadiene rubber (SBR) and styrene-butadiene styrene (SBS) at concentrations ranging from 1 to 6 mass percent in asphalt. The aggregates used were granite, gravel, and limestone. The procedure involved removing the polymer-modified asphalt from the aggregate by using tetrahydrofuran extraction and then analyzing the modified asphalt for polymer content with Fourier transform infrared (FTIR) analysis. In addition, an FTIR analysis procedure was developed for crumb rubber in HMA; this procedure used the same FTIR method used for SBR and SBS. Previous research reported individual calibration lines for a given polymer in several different asphalt cements. Quantitation of the polymer content involved developing a calibration line for each polymer-modified asphalt. The effect of combining the data for a given polymer in three different asphalts into one universal calibration line was evaluated.

Properties Comparisons and Cost Analysis of Asphaltic Cement Grade 80/100 and 60/70 Modified with Crumb Rubber and SBS Polymer

2014 ◽  
Vol 911 ◽  
pp. 484-488 ◽  
Author(s):  
Sudniran Phetcharat
Keyword(s):  
Weight Loss ◽  
Cost Effectiveness ◽  
Cost Analysis ◽  
Softening Point ◽  
Crumb Rubber ◽  
Asphalt Cement ◽  
Modified Asphalt ◽  
Polymer Modified Asphalt ◽  
The Cost

Enhancing the quality of AC 60/70 using crumb rubber and SBS polymer has its limitations. These limitations are in terms of lower than standard penetration properties, softening point and ductility based on the polymer modified asphalt cement TISI 2156-2547 standard. This research aimed at eliminating the problem by using AC 80/100 and modifying it with crumb rubber or SBS polymer at different quantities. Two types of AC were compared in this research. The qualities tested were penetration, softening point, ductility, flash point and weight loss due to heat. The results of the quality of properties tested were analyzed based on TISI 2156-2547 standardfor AC. Furthermore, the research goes on to analyze the cost effectiveness of the modification and found that modified AC 80/100 has better qualities than AC 60/70 but is 5% higher in cost. Modifying AC 80/100 with 5 wt.% crumb rubber and 4 wt.% SBS polymer will decrease the penetration and ductility problem compared to modifying AC 60/70 with the same additives. However, the softening point is still a problem for both grades of AC.

Nanoscale Evaluation of Multi-Walled Carbon Nanotube’s Performance on Resisting Oxidization of Asphalt

2020 ◽  
Vol 982 ◽  
pp. 195-200
Author(s):  
Abdullah Al Mamun ◽  
Okan Sirin
Keyword(s):  
Adhesive Force ◽  
Force Microscopy ◽  
Modified Asphalt ◽  
Atomic Force ◽  
Resistance To Oxidation ◽  
Pavement Engineering ◽  
Multi Walled Carbon Nanotubes ◽  
Polymer Modified Asphalt ◽  
Styrene Butadiene ◽  
Walled Carbon Nanotubes

Nanotechnology has contributed significantly to different subfields of the construction industry, including asphalt pavement engineering. The improved properties and new functionalities of the nanomaterials have provided different desired properties of asphalt. In this study, the effectiveness of multi-walled carbon nanotubes (MWCNT) in resisting the oxidation of polymer-modified asphalt was measured. A total of three different percentages (0.5%, 1%, and 1.5%) of MWCNT were used to modify the Styrene-Butadiene (SB) and styrene–butadiene–styrene (SBS) modified asphalt (4% and 5%). The laboratory oxidized asphalt samples were evaluated by an atomic force microscopy machine. The oxidation of the polymer-MWCNT modified asphalt is measured by simulating the existing functional group of the asphalt and as a function of the adhesive force. It is observed that the use of MWCNT in SB and SBS can increase the resistance to oxidation.

scholarly journals Evolution of Rheological Behaviors of Styrene-Butadiene-Styrene/Crumb Rubber Composite Modified Bitumen after Different Long-Term Aging Processes

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2345 ◽  
Author(s):  
Yangsheng Ye ◽  
Gang Xu ◽  
Liangwei Lou ◽  
Xianhua Chen ◽  
Degou Cai ◽  
...  
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Crumb Rubber ◽  
Modified Bitumen ◽  
High Speed Railway ◽  
Modified Asphalt ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

In this study, a new type of composite modified bitumen was developed by blending styrene-butadiene-styrene (SBS) and crumb rubber (CR) with a chemical method to satisfy the durability requirements of waterproofing material in the waterproofing layer of high-speed railway subgrade. A pressure-aging-vessel test for 20, 40 and 80 h were conducted to obtain bitumen samples in different long-term aging conditions. Multiple stress creep recovery (MSCR) tests, linear amplitude scanning tests and bending beam rheometer tests were conducted on three kinds of asphalt binders (SBS modified asphalt, CR modified asphalt and SBS/CR composite modified asphalt) after different long-term aging processes, including high temperature permanent deformation performance, resistance to low temperature thermal and fatigue crack. Meanwhile, aging sensitivities were compared by different rheological indices. Results showed that SBS/CR composite modified asphalt possessed the best properties before and after aging. The elastic property of CR in SBS/CR composite modified asphalt improved the ability to resist low temperature thermal and fatigue cracks at a range of low and middle temperatures. Simultaneously, the copolymer network of SBS and CR significantly improved the elastic response of the asphalt SBS/CR modified asphalt at a range of high temperatures. Furthermore, all test results indicated that the SBS/CR modified asphalt possesses the outstanding ability to anti-aging. SBS/CR is an ideal kind of asphalt to satisfy the demand of 60 years of service life in the subgrade of high speed railway.

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