MEASUREMENT OF ANTI-STRIPPING AGENT CONTENT IN ASPHALT MIXTURE WITH COLORIMETRIC TEST

Abstract

Stripping can cause premature damage to asphalt pavement. The content of anti-stripping agents
in the asphalt mixture needs to control, but the detection and quantification of the content of amine-based antistripping agent in asphalt mixture remain a practical problem, therefore research was conducted on how to
determine the content of anti-stripping agent contained in the asphalt mixture. Marshall Tests used in this study
to evaluate the use of an anti-stripping agent in asphalt mixture through Retained Stability, and Colorimetric Test
was held to measure the content of anti-stripping agent contained in asphalt mixture. The Colorimetric Test was
developed as a three-step process consisting of amine extraction and trapping through a steam distillation process,
sample preparation process and absorbance measurement used spectrophotometer UV/Vis. The anti-stripping
agent used in this study was Wetfix-Be with the addition content of 0,2%, 0,3%, 0,4%, and 0,5% of the asphalt
weight. The result of the Marshall Tests indicated that the presence of an anti-stripping agent in an asphalt
mixture characterized by an increase of the value of the Retained Stability. The addition of 0,4% Wetfix-Be gave
the highest increase in Retained Stability, which is equal to 9,25%. The Colorimetric Test result indicated that
this test could be used to measure the Wetfix-Be anti-stripping content contained in the asphalt mixture, which in
addition to Wetfix-Be anti-stripping 0,4% obtained measured anti-stripping content of 0,365%. This study is
critical because the accuracy of the content of anti-stripping agent added to the asphalt mixture will reduce the
problem of stripping.