The Effects of Using Crumb Rubber Modified Binder in an Asphalt Pavement

Abstract

In this study, laboratory investigations have been carried out to characterize and demonstrate the improved performance of asphalt after modifying it with crumb rubber. The study has been divided into two main parts. Firstly, the physical characterizations of crumb rubber modified bitumen with different percentages of crumb rubber have been evaluated using penetration, softening point, viscosity, ductility and thin film oven tests. In the second part, Marshall Mix design has been performed for both asphalt rubber and control asphalt. After finding the optimum mix for both of them, Marshall and indirect tensile tests have been performed on both moisture-conditioned and-unconditioned cases to assess their performance in terms of stability, deformation, tensile strength and the effect of moisture on paving mixtures. Control asphalt samples have been prepared for the purpose of comparison. These laboratory investigations have been intended to evaluate utilizing crumb rubber in dense graded asphalt mixtures. Previous studies have shown that gap graded and dense graded asphalt rubber mixes performed better somehow than their respective conventional asphalt mixes. In addition, in Kuwait, gap graded mix is only used for chip seal while dense graded asphalt mix is used for main pavement layers such as wearing course and most of the pavement failures happen in this layer. The comparison between the experimental results of asphalt rubber and conventional asphalt showed that asphalt rubber is significantly better than conventional asphalt in terms of rutting and shear resistance as well as stability.

Pencangkokan Anhidrida Maleat Pada Karet Alam Siklis : Penambahan Divinil Benzen untuk Meningkatkan Derajat Pencangkokan

“…Modifikasi secara kimia dilakukan melalui perubahan struktur molekul karet, diantaranya melalui proses kopolimerisasi (Sari et al, 2015), depolimerisasi (Mouawia et al, 2017) dan siklisasi (Bayu et al, 2019). Produk karet hasil siklisasi dikenal dengan karet alam siklis/KAS (Cyclized Natural Rubber/CNR) banyak digunakan sebagai bahan resin dalam pembuatan cat, tinta dan sebagai bahan pereka (Soleimani et al, 2020).…”

“…Untuk meningkatkan kompatibilitas dan kereaktifan dalam proses pencampuran, modifikasi kimia yang paling umum dilakukan yaitu maleanisasi (Zeng et al, 2010), (Said Siregar et al, 2014), (Soleimani et al, 2020), (Sitanggang & Eddyanto, 2019). Maleanisasi karet alam dapat melalui proses grafting molekul Anhidrida Maleat (AM) kedalam struktur karet alam dan telah banyak dilakukan untuk menghasilkan produk sesuai dengan spesifikasi yang diharapkan.…”

“…Maleanisasi karet alam dapat melalui proses grafting molekul Anhidrida Maleat (AM) kedalam struktur karet alam dan telah banyak dilakukan untuk menghasilkan produk sesuai dengan spesifikasi yang diharapkan. Pencangkokan AM dilakukan untuk meningkatkan hidrofilisitas karet alam yang selanjutnya dapat digunakan sebagai senyawa penghubung (coupling agent) yang dapat meningkatkan sifat antarmuka dan adhesi antara dua fase campuran yang berbeda (Soleimani et al, 2020).…”

“…Komonomer stirena telah dilaporkan penggunaannya sebagai penghubung pada pencangkokan AM pada polipropilena (Maziero et al, 2019), karet alam (Soleimani et al, 2020) dan KAS (Said Siregar et al, 2014). Pada pencangkokan AM pada KAS telah digunakan mononomer lain yaitu trimethylol propane triacrylate (Said Siregar, Ardilla, & Nasution, 2019), (Said Siregar et al, 2021).…”

Study on the thermal properties of the grafted product of maleic anhydride onto clylized natural rubber by using thermogravimetric method

“…Cyclization of natural rubber causes a change in the characteristics of natural rubber from being elastic to being thermoplastic that is hard and rigid. CNR still contain unsaturation after cyclization (Nandiyanto et al 2019;Soleimani et al 2020).…”