乳化沥青冷再生混合料早期黏聚力及影响因素

Influence Factor and Early Cohesion Force of Emulsified Asphalt Cold Recycling Mixture

为了研究乳化沥青冷再生混合料早期黏聚力指标缺失而引起的施工质量等问题,通过维姆(HVEEN)黏聚力试验方法研究了放置时间、乳化沥青特性与用量、沥青旧料(reclaimed asphalt pavement,RAP)掺量及拌和用水量对其冷再生混合料黏聚力的影响规律,借助于统计产品与服务解决方案(statistical product and service solutions,SPSS)软件分析了4种影响因素的显著性,并根据室内试验结果推荐了乳化沥青冷再生混合料早期黏聚力控制指标及要求,在最后探讨了提升乳化沥青冷再生混合料黏聚力的具体技术方式.试验结果表明:乳化沥青冷再生混合料黏聚力随放置时间、乳化沥青用量及拌和用水量的增加呈现出先增大后减小的趋势,随RAP掺量的增加而增大,且最大黏聚力存在于冷再生混合料和易性良好时;乳化沥青平均粒径越小并非黏聚力越大;黏聚力试验与劈裂强度试验确定最佳拌和用水量具有良好的一致性.乳化沥青用量、拌和用水量、乳化沥青特性及RAP掺量对其冷再生混合料黏聚力影响显著;掺加布敦岩沥青、再生剂及采用丁苯橡胶改性乳化沥青的技术方式对其冷再生混合料黏聚力改善效果明显,而掺加玄武岩纤维的技术方式对其冷再生混合料的黏聚力稍有降低.

To study the construction quality problems of emulsified asphalt cold recycling mixture caused at least in part by lack of early cohesive force index,the influence rule of different mixing time,characteristics and dosage of emulsified asphalt,reclaimed asphalt pavement(RAP)content and mixing water content for the cohesive force was systematically investigated by the HVEEN cohesive force test.Meanwhile,the significance of four influencing factors was analyzed by statistical product and service solutions(SPSS).According to the test results,the requirement for early cohesion force specification was recommended.Finally,technical measures for improving cohesive force were discussed in this paper.Results show that the cohesive force of the emulsified asphalt cold recycled mixture first increases and then decreases with the increase of the mixing time,dosage of emulsified asphalt and mixing water content,increases with the increase of the RAP content,and there is a maximum cohesive force when the workability of cold recycled mixture is good.The smaller the average particle size of emulsified asphalt is,the greater the cohesion force is not.The test of cohesion force is in good agreement with the indirect tensile test for optimum mixing water content.There is a significant impact on the cohesive force of emulsified asphalt cold recycling mixture including emulsified asphalt content,mixing water content,characteristics of emulsified asphalt and content of RAP,and there is a significant improvement of cohesive force when adding Buton rock asphalt(BRA),regenerating agent(RA)to the emulsified asphalt cold recycling mixture and using SBR modified emulsion asphalt,however,the cohesion force is slightly reduced with adding basalt fiber(BF).