The High Temperature Stability of Asphalt Composite Reinforced by Basalt Glass Powder and Basalt Fiber

摘要

Wood fiber and lime rock powder have been used as the asphalt stabilizer and filler in highway construction. Basalt fiber and glass powder were adopted as the replacements of traditional stabilizer and filler. The experimental samples were made by tyre rubber powder modified asphalt mixture, basalt fiber, lime stone powder and basalt glass powder. The dynamic stability of the samples at 60°C was indexed by the runs of automobile tracking. The samples with lime rock powder had the basalt fiber contents 0%, 0.2%, 0.25% and 0.3%, respectively. The corresponding dynamic stabilities were 4500 run/mm, 5300 run/mm, >6000 run/mm and 5400 run/mm. The samples with basalt glass powder had the basalt fiber contents 0%, 0.2% and 0.25%, respectively. The dynamic stability went above the upper limit of the tester when the basalt fiber content was 0.2%. The control group of basalt glass powder modified sample had 5600 run/mm, whereas the control group of lime rock modified sample was 4500 run/mm, of which the increment was 24%. We may conclude that the effect of basalt fiber reinforcement was significant. In addition, the basalt glass powder is better than lime rock powder, as the filler of asphalt composite.