scholarly journals COMPROMISE ASSESSMENT OF THE PREFERENCE OF STYRENE-BUTADIENE-STYRENE COPOLYMERS, USED IN THE PRODUCTION OF POLYMER-MODIFIED BITUMEN, USING FUZZY SETS

2020 ◽  
Vol 55 ◽  
pp. 97-102
Author(s):  
Yuliya A. Urcheva ◽  
◽  
Vladislav A. Kholodnov ◽  
Alexander M. Syroezhko ◽  
Valentin V. Vasiliev ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Fuzzy Sets ◽  
Industrial Production ◽  
Quality Characteristics ◽  
Modified Bitumen ◽  
Styrene Copolymers ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Polymer Modified Bitumen ◽  
Butadiene Styrene

The influence of structure of styrene-butadiene-styrene rubber on the quality characteristics of polymer-modified bitumen – produced on its basis – was identified. A program for a compromise assessment of the preference of such polymers using fuzzy sets was developed. A mathematical model was obtained that is recommended for use to optimize production and reduce costs in the industrial production of polymer-modified bitumen.

scholarly journals Analysis of the Effects of Ageing on the Cohesive Strength of Polymer-Modified Bitumen at Low Temperatures

2018 ◽  
Vol 13 (2) ◽  
pp. 156-164 ◽  
Author(s):  
Chuanfeng Zheng ◽  
Genze Li ◽  
Yazhi Xu ◽  
Danni Wang ◽  
Dan Lv
Keyword(s):  
Low Temperature ◽  
Low Temperatures ◽  
Decay Curve ◽  
Ageing Time ◽  
Cohesive Strength ◽  
Modified Bitumen ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Polymer Modified Bitumen ◽  
Butadiene Styrene

The decay law on the ageing process of the cohesive strength of styrene-butadiene-styrene(SBS)- and polyethylene(PE)-modified bitumens at low temperatures was investigated. The rotated-thin-film oven test was used to age the two types of polymer-modified bitumens. The cohesive strengths at different low-temperature conditions were tested quantitatively according to technology for testing the low-temperature cohesive strength of bitumen. The decay curve of bitumen low-temperature cohesive strengths was drawn, and the embrittlement time of bitumen at different ageing states was obtained according to the decay curve. Results showed that ageing time definitely influenced the attenuation degree of the low-temperature cohesive strength of the two types of polymer-modified bitumens and influenced the appearance of the low-temperature cohesive strength peak, i.e., the bitumen embrittlement time, which advanced after ageing. The lightweight components of polymer-modified bitumen were lost after ageing. The bitumen embrittlement time was advanced, and the sharp attenuation of the low-temperature cohesive strength of bitumen appeared. In the future, bitumen antiageing technology and lighter part pre-supplement technology should be studied in-depth.

The modification of bitumen with styrene–butadiene–styrene, ethylene vinyl acetate and varying the amount of reactive ethylene terpolymer

2017 ◽  
Vol 50 (3) ◽  
pp. 241-255 ◽  
Author(s):  
Seyfullah Keyf
Keyword(s):  
Vinyl Acetate ◽  
Softening Point ◽  
Elastic Recovery ◽  
Ethylene Vinyl Acetate ◽  
Modified Bitumen ◽  
Penetration Index ◽  
Different Types ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Butadiene Styrene

In this article, 50/70 penetration grade TUPRAS bitumen was modified. Reactive elastomeric terpolymer (Elvaloy RET; DuPont Company), ethylene vinyl acetate (EVA) and styrene–butadiene–styrene (SBS) polymers were used in bitumen modification. Set hours of the tests were applied to samples taken from the obtained modified bitumen mixture. Varying amount of reactive ethylene terpolymer with weight ratios of 0.5%, 1.0%, 1.5%, 2.0% and 2.5% were introduced to the mixture of raw bitumen with 1.0% SBS and 1.0% EVA. Penetration, penetration index, softening point, ductility and elastic recovery tests were performed with these modified bitumen and raw bitumen. The samples of raw bitumen and modified bitumens of 2.0% Elvaloy RET, 1.0% SBS and 1.0% EVA were investigated by means of IR spectroscopy. The raw bitumen was modified with SBS, EVA and RET, and it was determined that penetration and ductility values were decreased while penetration index, softening point and elastic recovery were increased. The purpose of this study is to research the improving properties of 50/70 penetration grade–modified bitumen used in highways of Turkey. The most important characteristics (such as softening point, penetration and % elastic recovery) of new polymer-modified bitumen (NPMB) containing 2.5% EVA, 1% RET and 1% SBS were compared with eight different types of polymer-modified bitumens in Turkey (TPMB). NPMB provided all required parameters (softening point, penetration and % elastic recovery) for five different types of TPMBs (TPMB 70-16, TPMB 70-22, TPMB 76-16, TPMB 76-22 and TPMB 82-16).

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