Abstract
Through a covalent grafting reaction, octadecyl amine (ODA) was grafted on the surface of waste rubber powder (WRP) to obtain an ODA-WRP modifier, which was in turn compounded with a styrene-butadiene-styrene block copolymer (SBS) to prepare ODA-WRP/SBS-modified asphalt. The three major indicators (i.e., dynamic shear rheometer (DSR), multi-stress creep recovery (MSCR), and separation tests) showed that 1-ODA-WRP effectively improved the complex shear modulus (G*), elastic Modulus (G′), and loss modulus (G″) by 36.47%, 40.57%, and 34.77% (64 °C and 10 Hz), respectively, as compared to pristine SBS-modified asphalt. Fluorescence microscopy (FM) results concluded that the enhancement in mechanical properties was accredited to the better compatibility of various components in asphalt and establishment of network structure between ODA-WRP and SBS in ODA-WRP/SBS-modified asphalt. Fourier infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) analyses confirmed the successful synthesis of ODA-WRP. This study could be of great help in synthesizing ODA-WRP asphalt modified with SBS for highways and construction applications.
Highlights
Styrene-butadiene-styrene block copolymer (SBS)-modified asphalt is widely used in the preparation of asphalt-based roads because of its excellent mechanical properties and high service life [1,2,3]
Fang et al [23] reported that the addition of WRP can improve the anti-aging performance of asphalt and prolong the service life of asphalt pavement. These results indicate that WRP-modified asphalt is feasible and provides an effective way for the disposal of waste rubber powder, though it needs to meet certain standards implemented in various countries [24,25]
The amino group (–NH2 ) on the octadecyl amine (ODA) reacted with the carboxyl group (–COOH) on the surface of WRP to form an amide (–NHCO–), thereby facilitating ODA grafting onto the WRP surface
Summary
Styrene-butadiene-styrene block copolymer (SBS)-modified asphalt is widely used in the preparation of asphalt-based roads because of its excellent mechanical properties and high service life [1,2,3]. With the development of the global automotive industry, the number of cars has increased rapidly, which has resulted in a corresponding increase in traffic pressure. With this increase, SBS-modified asphalt-based pavements have raised some problems, such as rutting, cracking, and a shortened road life [4,5,6]. Development of the automotive industry has increased the amount of waste rubber tires [18,19]. Disposal methods for used tires include incineration, recycling, and production of waste rubber powder (WRP) [20,21]. Among these, converting to rubber power (RP) has become the main treatment method of waste rubber tires because of its large output, low cost, and environmentally
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