Highway Engineering Composite Material and Its Application by Jialiang Yao & Zhigang Zhou & Hongzhuan Zhou

Author:Jialiang Yao & Zhigang Zhou & Hongzhuan Zhou
Language: eng
Format: epub
ISBN: 9789811360688
Publisher: Springer Singapore

Segregation Test

As the polymer is segregated from the asphalt in the process of stopping mixing, cooling, and storage, the polymer-modified asphalt cannot be used immediately after producing. It needs to cool, store, transport, and reuse after heating. The segregation test of modified asphalt is carried out to evaluate the compatibility of modifier with the matrix asphalt.

The polymer-modified asphalts such as SBR and SBS float when segregating. The test is to inject asphalt in the test tube and the specimen height is 180 mm. The specimen is then put in oven for 48 ± 1 h at 163 ± 5 ℃. is removed and put in the refrigerator for 1 h later. The modified asphalt condenses into a solid and then is pulled out. It is cut into the same three parts. The softening point of top and bottom specimens is measured, respectively. The difference of their softening points indicates the degree of segregation.

The polymer-modified asphalts, such as PE and EVA, adsorb the four sides of the container wall when segregating. Because of the surface crusts, the segregation test is to pour the asphalt into the specimen cup at the high temperature. Then, put it into oven for 15–18 h at 135 ℃ and observe the surface. At the same time, slowly detect the specimen with a small scraper, and check the consistency of surface layer and the sediment of the bottom, as shown in Table 4.1.Table 4.1Test evaluation of PE and EVA

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