Improving Storage Stability and Physicochemical Performance of Styrene-Butadiene-Styrene Asphalt Binder Modified with Nanosilica

Abstract

Due to storage stability drawbacks of polymer-modified bitumen (PMB), this study investigated the storage stability and physicochemical performance of Styrene-Butadiene-Styrene (SBS) asphalt binders (herein PMB) modified with Silicone surface-treated nanosilica (SNS). Dosages 0% (control), 1.5%, 3% and 5% SNS powder were added to PMB to prepare modified binders. Hot storage, Viscosity, Multiple Stress Creep Recovery (MSCR), Scanning Electron Microscopy (SEM), Fluorescence Microscopy (FM), Linear Amplitude Sweep (LAS), Fourier Transform Infrared (FTIR), and Proton Nuclear Magnetic Resonance (1H-NMR) tests were conducted using modified binders. The study found that adding nanosilica powder to PMB improved storage stability, increased viscosity and complex modulus, and reduced rutting of binders. However, this bitumen modification was not beneficial to fatigue cracking. The performance improvement was because of the interaction between the polymer and nanosilica, creating a new polymer-nanosilica network which lowered the dynamics around the SNS particles, thereby reducing phase separation. Further, the Silicone Si–O–Si backbone bond present in SNS modified asphalt binder reduced temperature sensitivity thereby preventing thermal degradation at high storage temperature. Nanosilica modified binders presented well-dispersed nanosilica particles in the asphalt matrix. The modification mechanism was predominantly physical. Overall, the study concluded that nanosilica improves storage stability, rutting, and morphology of PMB binders.

Research on the Rheological Properties of Asphalt Binder Modified by Fume Silica and Crumb Rubber Compound

“…The surface of pure nanosilica contains silanols that support the formation of hydrogen bonds with asphaltenes in bitumen. It has been observed that the surface of pure nanosilica has silanols and it promotes the formation of hydrogen bonds with asphaltenes in bitumen, thus demonstrating the physical interaction between the functional groups in the bitumen and the nanosilica [35][36][37][38]. In the FTIR spectrum in Fig.…”

Characterization of Asphalt Aging by Analytical Techniques: A Review on Progress and Perspectives

“…29 According to the authors, by photooxidation mechanisms, nonpolar species tend to polymerize from the oxidation of these compounds in carbonyl groups, which can interact. This behavior was observed from the variation of DBE values by 133 LF-NMR and 1 H NMR estimation of the viscosity of natural and aged samples based on T 2 measurements and relative hydrogen index Sun et al 134 1 H NMR correlation of the types of molecules with self-healing ability in asphalt Wang et al 18 LF-NMR measurements of the pore structure of petroleum asphalt cement mortar Menapace et al 19 LF-NMR variation in viscosity measurements of asphalt aged over the long-term by T 2 measurements Jaimes et al 20 LF-NMR and 1 H NMR measurement of physicochemical properties such as penetration, softening, rotational viscosity, and mass loss by NMR associated with chemometrics Blumich et al 23 NMR-MOUSE evaluation of the durability of rubber-modified asphalt Jaimes et al 135 LF-NMR and 1 H NMR prediction of the degree of penetration and softening point of vacuum residue by NMR associated with chemometrics Porto et al 7 13 C NMR characterization of organic sulfides present in A.C. Mansour et al 136 1 H NMR use of bitumen antioxidants to reduce the effects of aging Caputo et al 137 FT-NMR-SDC investigation of microchanges that occur in bitumen aging Lushinga et al 138 carbon number and the evaluation of the classes present, which revealed that oxygenated classes increased significantly.…”

Penentuan Stabilitas Penyimpanan Aspal Modifikasi Berbasis Karet Alam Padat Jenis Crumb Rubber

“…Perbedaan nilai titik lembek bagian bottom dan top pada sampel kadar 12% crumb rubber (12; 0; 0; 0) menjadi indikasi awal bahwa terjadi ketidakstabilan fasa (instability phase) yang lebih besar daripada sampel lainnya. Ketidakstabilan fasa disebabkan perbedaan densitas dan viskositas komponen, suhu penyimpanan dan kadar crumb rubber yang ditambahkan lebih tinggi dari sampel lainnya (Lushinga et al, 2020;Zhu, 2016;Zhu et al, 2017Zhu et al, , 2019. Namun, berdasarkan ketetapan Bina Marga tahun 2018, aspal modifikasi crumb rubber yang dihasilkan masih memenuhi spesifikasi yang ditetapkan.…”

“…Stabilitas penyimpanan aspal modifikasi pada sampel dengan 8% crumb rubber sangatlah buruk, hal tersebut dipengaruhi oleh kompatibilitas antara komponen penyusunnya. Kompatilibilitas aspal modifikasi crumb rubber alam sulit tercapai dikarenakan beberapa faktor yang mempengaruhinya diantaranya fenomena pembengkakan pada crumb rubber (swelling), stabilitas termal dari campurannya, densitas dan viskositas (Lushinga et al, 2020;Wieser, Schaur, & Unterberger 2021;Xia et al, 2021).…”

“…Hal tersebut membuat perbedaan densitas dan viskositas di antara dua fasa tersebut masih cukup besar dan kompatibilitas dari dua komponen tersebut belum dapat tercapai. Perbedaan densitas dan viskositas yang cukup besar antara komponen aspal dan crumb rubber membuat mobilitas fasa crumb rubber untuk terjadinya pemisahan fasa semakin cepat (Lushinga et al, 2020;Zhu, 2016;Zhu et al, 2017).…”