THE EFFECT OF NETWORK FORMATION ON THE RHEOLOGICAL PROPERTIES OF SBR MODIFIED ASPHALT BINDERS

摘要

Styrene-butadiene rubber (SBR) was used to modify asphalt binders. The rheological and thermo-mechanical properties of tile binders were investigated using rotational viscometry, dynamic shear rheometry, and thermal mechanical analysis. The optimum SBR content and mixing procedure mere determined based on the rheological properties of the asphalt/SBR blends. The addition of 3-5% (w/w) SBR resulted in enhanced high temperature performance of the binders. The SBR. progresses from a dispersed polymer to local networks to a global network with increasing SBR content. This phenomenon is exhibited in rheological properties such as complex modulus and melt viscosity. It is also verified visually by using a Laser Scanning Confocal Microscope. Because of tills network formation, the binders showed a large increase in the complex modulus which indicates resistance to rutting. [References: 11]