Application and Prospect of Potentiometric Titration in Asphalt Research
WANG Xiaofeng1, LIANG Bo1,2, CHEN Yufan1, ZHANG Kuankuan1
1 School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114,China 2 National Engineering Laboratory of Highway Maintenance Technology, Changsha 410114,China
Abstract: The composition of bitumen affects the performance of asphalt pavement. Environment and load cause the content and structure of asphalt components to change, which lead to the aging of asphalt, make it hard and brittle, and reduce the cohesiveness and the service life of asphalt pavement. The development of asphalt aging analysis technology is of great significance for the aging of asphalt materials, modification of asphalt and regeneration of aged asphalt. At present, fourier transform infrared spectroscopy, gel permeation chromatography, atomic force microscopy and fluorescence microscopy are widely used in asphalt aging research. However, they all have certain limitations, so it is important to develop a new research method. Potentiometric titration uses the titrant with known concentration to titrate the substances to be measured. The difference of ion concentration in the solution leads to different potential of indicator electrode potential. Before and after the end point of titration, the concentration of the substance to be measured changes significantly,which leads to a sudden potential jump. The content of the substance to be measured is calculated according to the consumption of titrant at the end point of titration. For a given chemical functional group, the change of electrode potential is unique and proportional to its concentration. Potentiometric titration is not affected by temperature, dark background, liquid junction potential and other factors of the sample to be tested. Therefore, potentiometric titration has high accuracy and is suitable for asphalt component research. In this paper, the applications of potentiometric titration in the detection and classification of acid-base components of asphalt, the study on the relationship between asphalt components and properties, and research progress in detection of moisture content, sulfur content, and the SBS content of styrene-butadiene-styrene block copolymer (SBS) modified asphalt are summarized from the perspective of monitoring the aging process of asphalt and guiding the regene-ration of aged asphalt. By potentiometric titration, the change of asphalt components before and after aging is combined with the study of asphalt properties and regeneration mechanism of aging asphalt, which provides a scientific basis for the design of durable asphalt pavement.
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