Physical, Chemical, Microstructural and Rheological Properties of Reactive Terpolymer-Modified Bitumen

Abstract

In this study, the change in the physical, chemical, microstructural, and rheological properties of a road bitumen modified with reactive terpolymer (Elvaloy®RET) was investigated. For this purpose, four different Elvaloy®RET percentages (0%, 0.4%, 0.8%, and 1.2% by wt.) were mixed with B 160/220 bitumen. Firstly, the obtained samples were subjected to a short and long-term aging process using a rotating thin-film oven test and pressurized aging vessel, respectively. Then, the engineering characteristics of the samples were investigated using X-ray diffraction, scanning electron microscopy, and conventional and Superpave bitumen tests. The results showed that Elvaloy®RET reacted with the main macromolecular groups in the bitumen, and that the modified bitumens behaved as a homogenous single phase structure as a result of this reaction. Conventional tests showed that Elvaloy®RET-modified bitumens were much harder than pure bitumen and had better aging resistance. Furthermore, the penetration classes of these bitumens changed and their temperature sensitivities decreased significantly. Rheological tests showed that the Elvaloy®RET additive increased the resistance of the bitumen against fatigue cracking and particularly permanent deformation. Moreover, the high temperature performance class of the bitumen also increased. However, parallel to the hardening of the bitumen, a reduction in its resistance to cracking at low temperature was observed.

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

“…This Figure shows a comparison of the microstructure surface between the binder modified with FSN before and after aging. This change in topography of the binder surface may be related to the release and leave of some molecular groups from binder structure due to aging 55 .…”

Effect of Fumed Silica Nanoparticles on Ultraviolet Aging Resistance of Bitumen

“…A change in the surface microstructure is observed, when comparing the surface images of the unaged bitumen (modified with fumed silica NPs) and those of the aged bitumen. It is assumed that the topography change in bitumen surface is related to the release of molecular groups as a consequence of aging [ 45 ], and that a more homogeneous structure will protect the bitumen better from aging.…”

Reaktif etilen terpolimerlerin bitümün modifikasyonunda kullanımı: Bir literatür araştırması

“…Günümüze yaklaşıldığında ise kompozit modifikasyonda RET kullanımıyla ilgili yapılan çalışmaların sayısında bir artış meydana gelmiştir (Keyf, 2018;Singh vd., 2019a;Singh vd., 2019b;Singh vd., 2018;Xu vd., 2020;Xu vd., 2019). Bununla birlikte, güncel çalışmalarda önceki çalışmalara kıyasla farklı ve daha güncel deney yöntemleri ile sadece RET kullanımının incelendiği veya RET ile diğer katkı maddelerinin karşılaştırıldığı çalışmalar da görülmektedir (Ali vd., 2018;Almusawi vd., 2021a;Athira vd., 2020;Domingos vd., 2020;Geckil, 2019;Geckil ve Seloglu, 2018;Skronka vd., 2019). Bu durum dikkate alındığında, RET modifikasyonu ile ilgili kesin bir kronolojik yargıya varmanın mümkün olmadığı ancak RET'ler üzerine yapılan çalışmaların sayısının giderek arttığı anlaşılmaktadır.…”

“…Buradan da anlaşılacağı üzere, RET modifikasyonu fiziksel özellikler göz önüne alındığında saf bitümün performansında önemli bir artış sağlayabilmektedir. (Almusawi vd., 2021a(Almusawi vd., , 2021bAlmusawi vd., 2019;Athira vd., 2020;Domingos ve Faxina, 2015a, 2015bGama vd., 2018;Geckil, 2019;Geckil ve Seloglu, 2018;Hafeez ve Kamal, 2009;Keyf, 2015Keyf, , 2018Selvavathi vd., 2002;Topal, 2010;Vachhani ve Mishra, 2014;Xu vd., 2019). Buna ilaveten, bitüme ilave edilen RET miktarındaki artışla birlikte bitümün viskozitesinde de bir artış meydana gelmektedir (Geckil, 2019;Geckil ve Seloglu, 2018;Hafeez ve Kamal, 2009;Selvavathi vd., 2002;Topal, 2010;Vachhani ve Mishra, 2014).…”