Method for detecting content of SBS (Styrene Butadiene Styrene) modifier in modified asphalt

Abstract

The invention provides a method for detecting content of an SBS (Styrene Butadiene Styrene) modifier in modified asphalt. The method mainly comprises the following steps: taking multiple modified asphalt standard samples of which the content of SBS modifiers is known, and acquiring the Raman spectrum of each modified asphalt standard sample by utilizing a Raman spectrometer; performing linear fitting on a relative ratio between a Raman characteristic peak which only belongs to SBS and a Raman characteristic peak which only belongs to matrix asphalt in each modified asphalt standard sample, thereby obtaining a standard curve; and performing a Raman spectrum test on a to-be-detected SBS modified asphalt sample, and calculating the content of the SBS modifier in the modified asphalt according to the measured relative ratio between the Raman characteristic peak which only belongs to SBS and the Raman characteristic peak which only belongs to matrix asphalt. The sample preparation process of the method is simple, and the measurement method is convenient and rapid, can be widely applied to detecting the contents of various SBS asphalt modifiers in a construction site environment and has positive significance in controlling the quality of the SBS modified asphalt and guaranteeing the road surface durability.

Description

technical field [0001] The invention relates to a detection method, in particular to a method for detecting the content of SBS modifier in modified asphalt by using Raman spectrum. Background technique [0002] Asphalt pavement is widely used in countries all over the world. In my country's high-grade highways, the proportion of asphalt pavement is more than 80%. However, the disadvantages of asphalt pavement are also obvious, such as easy flow at high temperature and cracking at low temperature. In recent years, modified asphalt with SBS as a modifier can comprehensively improve the performance of the road surface and greatly increase the service life of the road due to its excellent high and low temperature performance and excellent elastic recovery ability. SBS is a block copolymer of styrene and butadiene, which is a thermal rubber. A certain amount of SBS is added to hot asphalt, and under the action of a certain temperature and mechanical shear force, it forms a uni...

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Problems solved by technology

[0005] However, it is very difficult to detect the SBS content in SBS modified asphalt directly by Raman spectroscopy, because the Raman signal of the SBS modifier is much smaller than the background fluorescence, which causes the Raman signal of the SBS modifier to be interfered by the background fluorescence. accurate measurement

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