Selected Performance-Based Characteristics of Viscosity Improved Bituminous Binders

Abstract

Warm mix asphalts present a trend of last decade with a focus on reduced
energy demand and released emissions and bituminous vapours. One of the used techniques is
application of suitable organic or chemical additives or surfactants which are used as dopes
for bituminous binders or are added during mix production directly to the asphalt production.
Research done on the Czech Technical University focused on the use of such additives in
combination with bituminous binders. Several additives have been used together with 50/70
and 70/100 bitumen and experimentally tested with respect to their performance
characteristics. The influence on viscosity (dynamic viscosity), deformation behavior
(complex shear modulus, master curves) and performance in low-temperature range (bending
stiffness by Bending Beam Rheometer) has been assessed. Gained results and influence of
selected and tested additives is presented in this paper.