摘要
采用变温度马歇尔击实试验确定了泡沫温拌沥青混合料的最佳拌合、击实温度,针对泡沫温拌再生混合料低温性能和水稳定性较差的缺陷,基于马歇尔试验、冻融循环试验、四分点加载控制应变疲劳试验和分析了木质素纤维、聚酯纤维和硅藻土对泡沫温拌再生混合料耐久性的影响,并铺筑了试验段。研究结果表明,采用泡沫温拌技术是提高RAP掺量的有效技术途径,推荐采用"等空隙率法"确定泡沫温拌沥青拌合、击实温度;掺加木质素纤维、聚酯纤维和硅藻土均可解决泡沫温拌再生混合料低温性能不足和水稳定性较差的缺陷,3种外掺剂对泡沫温拌沥青混合料水稳定性的改善效果排序依次是硅藻土>聚酯纤维>木质素纤维,抗疲劳寿命改善效果依次是聚酯纤维>木质素纤维>硅藻土,掺加3.5‰聚酯纤维可使泡沫温拌再生混合料的疲劳寿命提高50%以上。工程实践表明,纤维泡沫温拌再生混合料增大了温再生混合料的RAP掺配比例,延长了温再生混凝土道路的使用寿命,经济、环境效益显著。
this article With variable temperature Marshall compaction test to determine the best mix warm foam mix asphalt, and compaction temperatures for warm mix foam regeneration of poor performance and water mix at low temperature stability defect, based on Marshall test, freeze-thaw cycle test, a quarter-point loading control strain fatigue testing and analysis of the lignin fibers, polyester fibers and diatomaceous earth warm foam mix recycling mixture durability impact and paving the test section. The results show that the use of warm mix technology bubble RAP is to improve the content of the effective technology way, recommended ＂ and porosity Law＂ to determine the bubble warm mix asphalt mixing, compaction temperature ; adding lignin fibers, polyester fibers and silicon diatomaceous earth may be insufficient to solve the foam mixture warm mix of renewable and low temperature performance and poor water stability defect, three kinds of admixture of warm mix asphalt foam effect of improving the stability of the sort of water followed by diatomaceous earth 〉 polyester fiber 〉 lignin fibers, the effect of improving fatigue life followed polyester 〉 lignin fibers 〉 diatomite, adding 3.5%o polyester fibers make warm mix of renewable foam mixture fatigue life of more than 50 percent. Engineering practice Shows that the fiber-foam mixture warm mix of renewable increased RAP blending ratio of temperature regeneration mixture, extending the life of the road recycled concrete temperature, significant economic and environmental benefits.
出处
《公路工程》
北大核心
2016年第6期150-154,163,共6页
Highway Engineering
基金
江西省自然基金项目(14JK560)
