scholarly journals Pretreatment of Crumb Rubber with a Silane Coupling Agent to Improve Asphalt Rubber Performance

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Li Liu ◽  
Zhaohui Liu ◽  
Chengcheng Yang
Keyword(s):  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Crumb Rubber ◽  
Economic Benefits ◽  
Modified Asphalt ◽  
Asphalt Rubber ◽  
Temperature Performance ◽  
Silane Coupling ◽  
Infrared Spectrometer ◽  
Styrene Butadiene

There are known problems of dissolution, consistency of performance, segregation, and instability with the crumb rubber currently used in asphalt for road engineering. A silane coupling agent (KH550) solution was therefore used to pretreat the crumb rubber so as to improve its interfacial characteristics. The effects of KH550 on the properties of asphalt rubber were studied using high- and low-temperature performance tests, temperature sensitivity test, and compatibility test. On the basis of these tests, the optimum concentration of KH550 pretreated crumb rubber is 1.0%. The surface properties and micromodifications of the treated crumb rubber were analyzed using scanning electron microscopy and an infrared spectrometer. The performance and economic benefit of the modified asphalt rubber was compared to styrene-butadiene-styrene (SBS) modified asphalt, and it was found that KH550 pretreated crumb rubber is able to significantly improve the high-temperature performance of asphalt rubber, thus offering notable potential economic benefits.

The Rejuvenating and Aging Performances of Aged SBS Modified Asphalt Treated by Different Rejuvenator Sealer Materials

2013 ◽  
Vol 753-755 ◽  
pp. 734-740 ◽  
Author(s):  
Li Wan ◽  
Shao Peng Wu ◽  
Min Lei ◽  
Kim Jenkins
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Economic Benefits ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Low Performance ◽  
Aged Binder ◽  
Styrene Butadiene ◽  
Sbs Modified Asphalt ◽  
Butadiene Styrene

Currently, rejuvenator seal which is one of the preventive maintenance methods is more widely used due to its economic benefits and convenience. This paper described the chemical and rheological evaluation of the aged styrene butadiene styrene modified asphalt (ASMA) treated by two rejuvenator sealer materials (RSMs). First the ASMA was rejuvenated by mixing with the RSMs. Then the ASMA and two rejuvenated binders were re-aged by 10h PAV test. At last, the new binder, ASMA, rejuvenated ASMAs, re-aged binders were tested by Dynamic shear rheometer (DSR) and Fourier Transform Infrared Spectroscopy (FTIR). The results showed that the first aging of the new binder had a significant decrease of the low temperature performance and slight improvement of the high temperature performance. In addition, the high temperature performance increased obviously after 10h PAV test. Two RSMs could significantly soften the aged binder due to increase of maltene content existing in the RSMs, and the rejuvenated binder exhibited a better low performance after the 10h PAV test. However they cannot restore the low temperature completely because that RSMs cannot remedy the degradation of SBS modifier and remove the carbonyl produced in the aging progress.

Effect of Shear Time and the Crumb Rubber Percentage on the Properties of Composite Modified Asphalt

2013 ◽  
Vol 848 ◽  
pp. 26-30
Author(s):  
Fu Qiang Dong ◽  
Wen Zhe Zhao ◽  
Yu Zhen Zhang ◽  
Hua Dong Sun ◽  
Wei Yu Fan ◽  
...  
Keyword(s):  
High Temperature ◽  
Crumb Rubber ◽  
Rubber Content ◽  
Step Method ◽  
Modified Asphalt ◽  
Temperature Performance ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Important Measurement ◽  
Butadiene Styrene

This paper presents a laboratory study of Styrene-Butadiene-Styrene (SBS)/ crumb rubber modified asphalt by the two-step method. The conventional properties of the modified asphalt were determined. The effects of crumb rubber content and shearing time on the performance of the crumb rubber modified asphalt and composite modified asphalt. The results show that the crumb rubber contents and shearing time have significant impacts on the performance of the modified asphalt. With the crumb rubber content increasing, the high temperature performance was improved and the low temperature chanethe softening point increases and penetration decrease, and the ductility change little. It is comfortable for workability at the crumb rubber content of 20%. The viscosity is an important measurement for the workability of the modified asphalt. After adding the stabilizer, the viscosity increases until the shearing time reaching 1.5h, then it will decrease gradually.

Proportion of Tensile Strength and Compressive Strength of the Crumb Rubber Concrete Modified by Silane Coupling Agent

2014 ◽  
Vol 953-954 ◽  
pp. 1520-1523
Author(s):  
Wei Li ◽  
Zhen Huang ◽  
Xiao Chu Wang ◽  
Jun Wei Wang
Keyword(s):  
Mechanical Properties ◽  
Compression Ratio ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Crumb Rubber ◽  
Silane Coupling ◽  
Tension And Compression ◽  
Adhesive Ability ◽  
Inorganic Molecules ◽  
Rubber Concrete

Silane coupling agent built a "molecular bridge" between organic molecules and inorganic molecules, which modified the rubber surface and increased the adhesive ability of rubber particles and cement, so that improved the mechanical properties of rubber concrete. This paper studied on the modification effect of coupling agent on the rubber concrete while the quality of silane coupling agent was 0.5% of that of cementitious material which compared with the mechanical properties of unmodified rubber concrete and the test of concrete under tension and compression ratio and compression ratio were analyzed at the same time.

Laboratory Evaluation on Performance of Crumb Rubber SMA

2010 ◽  
Vol 168-170 ◽  
pp. 1749-1755 ◽  
Author(s):  
Yu Ming Dong ◽  
Yi Qiu Tan
Keyword(s):  
Performance Evaluation ◽  
Material Design ◽  
Crumb Rubber ◽  
Laboratory Evaluation ◽  
Scrap Tire ◽  
Modified Asphalt ◽  
Asphalt Rubber ◽  
Temperature Performance ◽  
Evaluation Phase ◽  
Sbs Modified Asphalt

Crumb rubber modified (CRM) asphalt with crumb rubber of scrap tire has higher viscosity, better flexibility, outstanding anti-fatiguing and anti-aging properties. This paper mainly investigated material design and performance evaluation of CRM asphalt SMA mixture. Brookfield Viscosity test is used to ascertain the adoption of fiber in CR-SMA. Because of resilient volume swelling of asphalt rubber mortar, gap-coarse grade must be adopted in asphalt rubber concrete to provide enough free space. This paper amends material composition and grade proportions range of adapted CR-SMA depending on the special characteristic of CRM asphalt. After confirming best grade of CR-SMA, this paper adopted Marshall Method to design Job Mix Formula (JMF) of surface layer CR-SMA13 in Beijing airport south line expressway. The best CRM asphalt content and feasible gradation middle value were obtained by Marshall Test and volume parameter calculation. During performance evaluation phase, other two SMA usually used in Beijing region is added, including SBS modified asphalt SMA, Trinidad Lake asphalt (TLA) and SBS modified asphalt SMA. By evaluations of high temperature performance, low temperature performance, moisture sensitivity and so on. The results indicate that pavement performance of CR-SMA is excellent, and have no distinct difference compared with the other two SMA.

Effect of silane coupling agent on filler and rubber interaction of silica reinforced solution styrene butadiene rubber

2013 ◽  
Vol 34 (10) ◽  
pp. 1575-1582 ◽  
Author(s):  
Liangliang Qu ◽  
Guozhu Yu ◽  
Ximing Xie ◽  
Lili Wang ◽  
Jing Li ◽  
...  
Keyword(s):  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Silane Coupling ◽  
Styrene Butadiene
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