scholarly journals Experimental Investigation on the Use of Waste Elastomeric Polymers for Bitumen Modification

2020 ◽  
Vol 10 (8) ◽  
pp. 2671
Author(s):  
Sadegh Yeganeh ◽  
Mahmoud Ameri ◽  
Davide Dalmazzo ◽  
Ezio Santagata
Keyword(s):  
Permanent Deformation ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Waste Products ◽  
Expected Performance ◽  
Polybutadiene Rubber ◽  
Modified Binders ◽  
Experimental Findings ◽  
Styrene Butadiene ◽  
Bitumen Modification

The study described in this paper focused on the possible use of waste products coming from the production of styrene–butadiene rubber (SBR) and polybutadiene rubber (PBR), as bitumen modifiers. Modified binders containing these products were prepared in the laboratory with different polymer dosages and were thereafter subjected to the evaluation of empirical and rheological properties. For comparative purposes, the study also considered SBR and PBR products of premium quality. Ageing effects were also taken into account by means of proper laboratory simulations. Obtained results indicated that the two types of polymer (SBR and PBR) have completely different effects on the rheology and expected performance of the resulting modified binders. In particular, while the two polymers showed similar effects in terms of resistance to permanent deformation, the SBR products proved to be superior from the viewpoint of fatigue resistance. However, only minor differences were found when comparing the effects produced by premium quality and waste polymers. As a result of the experimental findings, it was concluded that the use of waste SBR polymers can be an attractive solution for the production of affordable modified binders.

scholarly journals Influence of Additives on Permanent Deformation and Resilient Modulus of Recycled Asphalt Concrete

2020 ◽  
Vol 26 (2) ◽  
pp. 159-175
Author(s):  
Mustafa Shakir Mahdi ◽  
Prof. saad Isa Sarsam
Keyword(s):  
Carbon Black ◽  
Compressive Stress ◽  
Asphalt Concrete ◽  
Resilient Modulus ◽  
Permanent Deformation ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
Styrene Butadiene

Tests were performed on asphalt concrete specimens with (101.6 mm in diameter and 101.6 mm in height), and the results were implemented for calculating permanent deformation and resilient modulus under repeated compressive stress with different levels of stresses (0.068, 0.138 and 0.206) MPa at 40 ºC. Two types of additives namely (carbon black-asphalt) and (SBR-asphalt) were tried as rejuvenators with three percentages of (0.5, 1 and 1.5) % by weight of asphalt cement along with two ratios of AC (1 and 2) % have been implemented as rejuvenator and blended with the reclaimed asphalt concrete. Aged materials were obtained from the site. 100% Reclaimed Asphalt Pavement material from the reclaimed mixture is implemented. A set of (3) specimens were prepared for every mixture; three specimens were tested under (repeated compressive stress) at each level of stress. The objective of this work was to study the effect of two types of additives (Styrene-Butadiene-Rubber (SBR) and carbon black) on the performance of recycled asphalt concrete mixture. It was concluded that the Resilient modulus (Mr) at (0.138 and 0.206) MPa stress level decreases by (14, 22 and 8) % and (22, 34 and 11) for reclaimed and recycle mixtures with (carbon black-asphalt and SBR-asphalt) respectively when compared with that at 0.068 MPa. Permanent deformation for recycled mixtures with (carbon black-asphalt and SBR-asphalt) increased by (65.9, 4.54) %, (146.6, 27.2) % and (79, 5.5) % at level of stresses (0.068, 0.138 and 0.206) MPa respectively when compared to reclaimed mixture.

Characterization of Natural Rubber (NR), Polybutadiene Rubber (BR) and Styrene-Butadiene Rubber (SBR) Blends Cured in a Vulcanization System

2021 ◽  
Vol 1039 ◽  
pp. 51-64
Author(s):  
Muhsin Jaber Jweeg ◽  
Zaid G.A. Al-Jlaihawi
Keyword(s):  
Tensile Strength ◽  
Carbon Black ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Maximum Value ◽  
Polybutadiene Rubber ◽  
Maximum Tensile Strain ◽  
Number Of Cycles ◽  
Styrene Butadiene

In this work, the mechanical properties of three types of dough rubber NR, NR/BR, and NR/SBR have been investigated using five percentages of materials fill (30, 40, 50, 60, and 70) pphr. Carbon black was used as a filler material. The tensile test was achieved with 300% elongation and strain rates of (100, 200, 300, 400, and 500) mm/min. The tensile strength results indicate that the maximum value of tensile strength for NR Dough carbon black 60 pphr reaches 23.2 MPa; the maximum tensile strain of NR dough (carbon black 50 pphr) reaches 805.5%, and the modulus of elasticity with carbon black 70 pphr reaches 4.3 MPa. It was found that the compression strength decreases with increasing the carbon black, and the maximum value of compression set at NR dough (carbon black 30 pphr) reaches 29.3%. Fatigue crack growth was achieved according to ASTM D 813 for rubber testing. The minimum value of fatigue strength dough (carbon black 70 pphr) reaches 68 (IRHD). For NR dough (carbon black 30,40,50 pphr) reaches 3.5 mm at the number of cycles 15000 cycle. Finally, the maximum hardness of NR.

Statistical Analyses of Aggregate Mineral–Binder Adhesion: Measuring with Particle Probe Scanning Force Microscopes

2017 ◽  
Vol 2632 (1) ◽  
pp. 25-31 ◽  
Author(s):  
Yujie Li ◽  
Jie Yang ◽  
Ting Tan
Keyword(s):  
Statistical Analyses ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Modified Binders ◽  
Unit Surface ◽  
Average Unit ◽  
Scanning Force ◽  
Styrene Butadiene ◽  
Mineral Binder ◽  
Butadiene Styrene

Aggregate–binder adhesion is critical to the performance of asphalt mixtures. Recently, particle probe scanning force microscopes were created to measure the adhesion between aggregate minerals and various plain and modified binders at the microscale. In this study, statistical analyses were performed to evaluate comprehensively the effects of different factors on the aggregate–binder adhesion, including aggregate constituents, binder types, and modifier types. Average unit surface energy values were used to quantify the adhesion between aggregate minerals and various binders. Results showed that the alumina–binder pairs exhibited the greatest adhesion. For the control binder, the adhesion values increased as the weight percentages of styrene–butadiene–styrene, styrene–butadiene–rubber, and polyphosphoric acid increased. Adhesion differences between aggregate minerals and various plain and modified binders were observed by using particle probe scanning force microscopes.

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