Naslov
Dynamic Mechanical Behaviour of Polymer Modified Bitumen

Autori
Rek, Vesna ; Barjaktarović, Zrinka

Izvornik
Material Researh Innovation (1432-8917) 6 (2002), 2; 39-43

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
polymer bitumen; dynamic mechanical analysis; phase composition; phase number; viscoelastic properties; traffic frequency; creep fatique regime; ageing; master curves; models

Sažetak
The dynamic mechanical behaviour of bitumen (BIT) modified with styrene/butadiene/styrene block copolymer (SBS)were investigated. Dynamic mechanical analysis (DMA) were performed in the temperature range -80 to 60 oC. The primary viscoelastic functions were determined at the traffic frequency, 5 Hz. The BIT + SBS blends were investigated in creep fatique regime at temperature 10, 20, 30, 40 and 50 oC. Dynamic Mechanical Behaviour of BIT + SBS blends depends on their morphological characteristics, number of phases, phase composition and phase content in blend, as well as time and temperature. The curves of primary viscoelastic functions, storage modulus (E'), loss modulus (E") and loss tangent tg delta vs. temperature of polymer modified bitumen differ from unmodified bitumen and indicate the presence of the swollen polybutadiene and polystyrene phases in bitumen phase. The curve E' vs. temperature of polymer modified bitumen show the rubbery plateau. With the increment of SBS content the rubbery plateau is shifted to high temperatures. At the constant load the creep values of BIT-SBS blends increase and those of creep modulus decrease over a period of time. These effect a more pronaunced in samples with higher content of SBS. The time-temperature correspodence principle was applied to create master curves for the reference temperature 10 oC for the creep modulus of BIT+SBS blends. The data were analyzed using WLF and Arrhenius equantions.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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