Research on Compaction Characteristics of Hot In-place Recycling Asphalt Pavement Based on Foaming Technology
The foam warm mixing technology(FWMA)was applied to the hot in-place recycling technology(HIR)to improve the compaction effect of hot in-place recycling asphalt mixture(HIR-AM).The process parameters of foam asphalt preparation were determined through the expansion rate and half-life tests to study the improvement effect of foam asphalt on HIR-AM compaction quality.The road performance of foam geothermal recycled asphalt mixture(HIR-FAM)was evaluated through laboratory tests.Finally,the research results were verified by the physical pro-ject,and the HIR-FAM construction technology was summarized.The research results indicate that the foaming ef-fect of SBS modified asphalt is optimal when the foaming temperature is 170 ℃ and the water consumption is 1.7％;At the same mixing temperature,FWMA can reduce the porosity of HIR-AM by 3.8％to 21.2％and the energy compaction index CEI by 27.83％to 64.75％;The dynamic stability,flexural tensile strength,maximum flexural tensile strain,residual stability,and freeze-thaw splitting strength ratio have increased by 12.2％,13.4％,11.8％,8.8％,and 4.9％,respectively,and have better hydrothermal stability;Compared with the HIR-AM section,the results of the actual engineering inspection show that the average compaction degree of the HIR-FAM section has increased by more than 0.79％,and its compaction uniformity is better.
万方数据
维普
