scholarly journals The continuous swelling-degradation behaviors and chemo-rheological properties of waste crumb rubber modified bitumen considering the effect of rubber size

2021 ◽  
Vol 307 ◽  
pp. 124966
Author(s):  
Shisong Ren ◽  
Xueyan Liu ◽  
Peng Lin ◽  
Haopeng Wang ◽  
Weiyu Fan ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Crumb Rubber ◽  
Modified Bitumen ◽  
Degradation Behaviors ◽  
Waste Crumb Rubber

scholarly journals Aging and Rheological Properties of Latex and Crumb Rubber Modified Bitumen Using Dynamic Shear Rheometer

2020 ◽  
Vol 52 (3) ◽  
pp. 385 ◽  
Author(s):  
Abdulnaser M Al-Sabaeei ◽  
Bayu Agus Mustofa ◽  
Muslich Hartadi Sutanto ◽  
Sri Sunarjono ◽  
Nura Bala
Keyword(s):  
Rheological Properties ◽  
Crumb Rubber ◽  
Dynamic Shear ◽  
Modified Bitumen ◽  
Dynamic Shear Rheometer

scholarly journals RHEOLOGICAL PROPERTIES OF BITUMEN MODIFIED WITH A COMBINATION OF FT PARAFFIN WAX (SASOBIT®) AND OTHER ADDITIVES

2016 ◽  
Vol 22 (2) ◽  
pp. 135-145 ◽  
Author(s):  
Hassan FAZAELI ◽  
Amir A. AMINI ◽  
Fereidoon MOGHADAS NEJAD ◽  
Hamid BEHBAHANI
Keyword(s):  
Rheological Properties ◽  
Polyphosphoric Acid ◽  
Crumb Rubber ◽  
Mechanical Analysis ◽  
Modified Bitumen ◽  
Modified Binders ◽  
Conventional Tests ◽  
Ft Ir ◽  
Styrene Butadiene ◽  
Butadiene Styrene

Fischer–Tropsch paraffin Sasobit® is a popular Warm Mix Asphalt (WMA) modifier applied to improve physi­cal and rheological properties of bitumen. Although there are a number of studies investigating the effects of sasobit on bitumen properties, little has been carried out on evaluation of bitumen modified by sasobit along with other additives. In this study, sasobit modified bitumen is used as the base condition and four common modifiers namely anti-stripping agent, Crumb Rubber (CR), Styrene–Butadiene–Styrene (SBS) and Polyphosphoric Acid (PPA) are added separately to the FT – Wax modified bitumen to evaluate the compatibility of these additives with sasobit. Morphological, rheological and physical properties of modified binders are studied using Fourier Transform Infrared Spectroscopy (FT-IR), Scan­ning Electron Microscopy (SEM), Dynamic Mechanical Analysis (DMA), Bending Beam Rheometer (BBR) alongside with conventional tests. Results show that although anti-stripping agent reduce bitumen viscosity and mixing/compac­tion temperatures of asphalt mixtures, it has significantly increased the stiffness of sasobit modified bitumen at low temperatures. Among all, sasobit and crumb rubber combination exhibited the best performance, especially at low and intermediate temperatures.

scholarly journals Hybrid Polymerisation: An Exploratory Study of the Chemo-Mechanical and Rheological Properties of Hybrid-Modified Bitumen

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 945 ◽  
Author(s):  
Ilya Binti Joohari ◽  
Filippo Giustozzi
Keyword(s):  
Rheological Properties ◽  
Mechanical Performance ◽  
Strain Curve ◽  
Crumb Rubber ◽  
Hybrid Polymer ◽  
Stress Strain Curve ◽  
Modified Bitumen ◽  
Elongation At Break ◽  
Polymer Hybrid ◽  
Polymer Modified Bitumen

In this study, the mechanical and rheological properties of hybrid polymer-modified bitumen (PMB) have been investigated. For this purpose, nine different polymers—including crumb rubber, elastomers and plastomers at varying content—were studied to evaluate their mechanical performance as single polymers, first, and as a combination of two or more polymers as a hybrid polymer blend. Subsequently, the hybrid polymer blends were added in a relatively small percentage into the base bitumen to study its influence on the rheological performance of hybrid PMB. The mechanical properties identified from the analysis of the stress-strain curve of the single polymers were the Young’s Modulus, tensile stress, and elongation at break. The chemical structure of the polymer hybrid blends was analysed using FTIR, followed by frequency sweep tests conducted using the dynamic shear rheometer (DSR) to determine the bitumen rheological properties. Results showed that hybrid PMB enhances the viscoelastic behaviour of bitumen at both low and high temperature compared to other PMBs only including single polymers.

scholarly journals Evaluation of Micro-Mechanism and High- and Low-Temperature Rheological Properties of Disintegrated High Volume Crumb Rubber Asphalt (DHVRA)

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1145
Author(s):  
Wei Li ◽  
Sen Han ◽  
Xiaokang Fu ◽  
Ke Huang
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Rheological Properties ◽  
Particle Diameter ◽  
Gel Permeation Chromatography ◽  
High Volume ◽  
Crumb Rubber ◽  
Test Method ◽  
Polar Component ◽  
Temperature Performance

The aims of this paper are to prepare disintegrated high volume crumb rubber asphalt (DHVRA) with low viscosity, good workability and low-temperature performance by adding disintegrating agent (DA) in the preparation process, and to further analyze the disintegrating mechanism and evaluated high-temperature and low-temperature rheological properties. To obtain DHVRA with excellent comprehensive performance, the optimum DA dosage was determined. Based on long-term disintegrating tests and the Fluorescence Microscopy (FM) method, the correlations between key indexes and crumb rubber (CR) particle diameter was analyzed, and the evaluation indicator and disintegrating stage division standard were put forward. Furthermore, Fourier transform infrared spectroscopy (FT-IR) and Gel Permeation Chromatography (GPC) was used to reveal the reaction mechanism, and the contact angle test method was adopted to evaluate the surface free energy (SFE). In addition, the high-temperature and low-temperature rheological properties were measured, and the optimum CR content was proposed. Results indicated that the optimum DA dosage was 7.5‰, and the addition of DA promoted the melt decomposition of CR, reduced the viscosity and improved the storage stability. The 135 °C rotational viscosity (RV) of DHVRA from mixing for 3 h could be reduced to 1.475 Pa·s, and the softening point difference was even less than 2 °C. The linear correlation between 135 °C RV and the diameter of CR particle in rubber asphalt system was as high as 0.968, and the viscosity decay rate (VDR) was used as the standard to divide the disintegrating process into a fast disintegrating stage, stable disintegrating stage and slight disintegrating stage. Compared to common rubber asphalt (CRA), DHVRA has an absorption peak at 960 cm−1 caused by trans olefin = C-H, and higher molecular weight and polar component of surface energy. Compared with CRA, although the high-temperature performance of DHVRA decreases slightly, the low-temperature relaxation ability can be greatly improved.

Recycling of waste crumb rubber into a commercial materials

2021 ◽  
Author(s):  
S. Godwin Barnabas ◽  
K. Arun Vasantha Geethan ◽  
M. Venkatesh Perumal
Keyword(s):  
Crumb Rubber ◽  
Waste Crumb Rubber
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