Laboratory Research of Optimum Fiber Content in SMA Mixture Based on High Temperature Performance

Abstract

At present designers take little account of the different requirements of pavement performance when determining the adding ratio of lignin fibers in Chinese SMA mixture. Basing on the high temperature performance the article studied the optimum fiber content of SMA-13 mixture through comparative tests of performance. First aiming at SMA-13 mixture with different fiber contents, the mix proportions were designed and asphalt contents were verified. Then the effect of fiber content on high temperature performance was indicated through three kinds of interrelated performance tests. At last other pavement performances of SMA-13 mixture were verified. Based on the test results, an optimum fiber content of 0.33% is recommended for the lignin fibers used in this SMA-13 mixture, with which mixture poses the best high temperature performance.