基于低温应变能的寒区沥青混凝土纤维最佳掺量确定方法

寒区道路对沥青混凝土的抗裂性要求较高。纤维沥青混凝土具有较好的低温抗裂性,纤维掺量是影响沥青混凝土低温性能的重要因素。测量不同纤维掺量下沥青混凝土的低温弯曲应变能,以低温应变能达到最大值时的纤维掺量作为纤维的最佳掺量,同时还要考虑其他低温性能指标是否在理想范围内。试验结果表明,基于低温弯曲应变能的最大值确定纤维的最佳掺量是一种较为科学有效的方法。

Confirmation of Optimal Amount of Fiber Mixed in Asphalt Concrete in Cold Region Based on Low-Temperature Strain Energy

There is high requirement on the crack resistance of asphalt pavement in cold region. The fiber- reinforced asphalt concrete has good low-temperature crack resistance. The mixing amount of fiber is an impor- tant factor influencing the low temperature performance of asphalt concrete. The paper measures the low-temper- ature bending strain energy of asphalt concrete with different mixing amount of fiber, and takes the mixing amount of fiber when low-temperature strain energy achieves maximum as the best amount. Meanwhile if the oth- er low temperature indexes are in reasonable range should be considered. The test result shows that to confirm the optimal amount of fiber on the basis of the maximum of low-temperature strain energy is a scientific and ef- fective method.