Abstract
The advantageous thermal stability and construction workability of gussasphalt, a type of asphalt concrete, has drawn increasing attention. To prepare a type of superior gussasphalt concrete using Qingchuan rock asphalt (QRA), a modified gussasphalt binder was prepared with modifiers made up by different dose of styrene-butadiene-styrene, terpene resin, furfural extraction oil and SAW. Then, the rheological properties, microstructure, and thermal stability of gussasphalt binder were studied. The results indicated that the modifier #1 had significant effects on the other indexes but for the ductility, it was less effective in improving the low-temperature performance of the asphalt binder. The low-temperature performance of the binder with modifier #2 was superior compared with that of binder with modifier #1. The binder with 12.5% QRA and 5% modifier #2 can be regarded as an optimal collocation, which had a superior compatibility, high-temperature performance, and comprehensive temperature susceptibility.
Highlights
Gussasphalt concrete presents a flowing state at an appropriate construction temperature (220–250°C), which can autonomously reach the required density and flatness without compaction (Wang et al, 2011)
2.1.3 Modifying Agent Different modifying agents were adopted in this study (Table 2), it is widely acknowledged that Styrene-butadiene-styrene (SBS) can enhance the elasticity of binder at high temperatures and increase flexibility of binder at low temperatures, terpene resin (TR) is easy to mix with asphalt after heating and melting, and during this process, the initial adhesion and aging resistance of asphalt were greatly improved as well
Referring to the technical requirements for modified hard asphalt binder in the Technical Guide on Design and Construction of Bridge Deck Paving of Highway Steel Box Girder, the specimen with the 10% Qingchuan rock asphalt (QRA) content and less than 5% modifier #1 content does not meet the penetration requirements (1–4 mm)
Summary
Gussasphalt concrete presents a flowing state at an appropriate construction temperature (220–250°C), which can autonomously reach the required density and flatness without compaction (Wang et al, 2011). It is more suitable for bridge deck paving and other construction that heavy compaction machinery can’t get involved. Gussasphalt concrete meets these performance requirements, but can effectively resist the stress caused by the partial deflection of the steel plate. It possesses excellent adhesion and compliance with the steel deck (Qiu et al, 2019; Wang et al, 2019). Gussasphalt concrete is suitable for deck paving, especially for long-span and medium-span steel bridges (Chen et al, 2011b; Sang Luo et al, 2018; Ke et al, 2019)
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