摘要
文章分析了桥面铺装沥青混合料不同的泛白现象驱动力,利用自行开发的沥青混合料"临界气压差试验"确定气压差作用为泛白现象驱动力,分析了不同油石比以及离析程度下沥青混合料的抗泛白性能。结果表明:低油石比、低程度离析率的沥青混合料不易出现泛白现象;在相同的空隙率下,离析程度对抗泛白性能的影响大于油石比。在相同空隙率条件下,离析程度对抗泛白性能的影响程度大于油石比提出的"临界气压差""2kPa下开始唧浆时间"和"2kPa下3min唧浆量",可以有效的评价沥青混合料抗泛白性能。本研究对预防桥面铺装沥青混合料的泛白早期病害有较大工程价值。
The article analyzes the different driving forces of the whitening phenomenon and uses the self-developed asphalt mixture"critical air pressure difference test"to determine that the air pressure difference is the driving force for the whitening phenomenon.Besides,the paper also analyses the anti-efflorescence performance of asphalt mixtures in different bitumen-aggregate ratio and degree of segregation.The results show that asphalt mixtures with low oil-stone ratio and low segregation rate are not prone to whitening;under the same porosity,the degree of segregation has a greater impact on the anti-whitening performance than the oilstone ratio.While in the same porosity,the degree of segregation has more influence on the anti-efflorescence performance than the bitumen-aggregate ratio.The proposed"Critical pressure difference","Pulping time at 2 kPa"and"Pulp pumping volume at 2 kPa in3 min"indexes can effectively evaluate the anti-efflorescence performance of asphalt mixtures.It is of great engineering value to prevent the early efflorescence diseases of asphalt mixture in bridge deck pavement.To improve the anti-efflorescence ability of asphalt mixture in bridge deck pavement,the bitumen-aggregate ratio could be extended to increase the VFA.In the actual construction process,operation standard should be strictly controlled to avoid the asphalt mixture segregation.
作者
周雄
李宁博
郝培文
王雨谨
李绍辉
ZHOU Xiong;LI Ning-bo;HAO Pei-wen;WANG Yu-jin;LI Shao-hui
出处
《内蒙古公路与运输》
2021年第6期9-16,共8页
Highways & Transportation in Inner Mongolia
基金
陕西省交通运输厅2017年度交通科研项目(17-07K)。
关键词
沥青混合料泛白现象
油石比
离析程度
临界气压差
开始唧浆时间
唧浆量
改善措施
efflorescence-phenomenon of the asphalt mixture
bitumen-aggregate ratio
degree of segregation
critical pressure difference
pumping time
pumping volume
improvement measure
