摘要
川藏过渡区气温和风速复杂多变,在进行沥青混合料摊铺碾压时难以有效控制其压实质量.为此,以川藏过渡区德昌至会理高速公路LM3标段为依托开展现场铺筑试验.首先基于理论分析和现场实测对SMA-13、 AC-20C及AC-20共3种不同沥青混合料在铺筑过程中的降温规律进行分析.然后对气温、风速及混合料类型共3个因素开展SPSS正交分析,从而获得其对有效碾压时间的影响性排序.进一步根据降温规律建立沥青混合料的碾压温度估算模型,同时开展室内变温击实试验对其最佳击实温度进行估算.结果表明:当风速小于6 m/s且气温大于5℃时,AC-20C与AC-20的碾压质量较好;当风速大于3 m/s且气温为5~15℃时,SMA-13的碾压质量欠佳;对有效碾压时间的双因素影响性排序为气温&风速>气温&混合料类型>风速&混合料类型;SMA-13、 AC-20C及AC-20的最佳击实温度分别为169℃,166℃,152℃.最后基于分数阶理论,给出了不同气温、风速下不同类型沥青混合料的现场摊铺和碾压温度建议值.
The temperature and wind speed in Sichuan-Xizang transition zone are complex and variable.It is difficult to effectively control the compaction quality when paving with asphalt mixture.Therefore,the field paving test was carried out based on LM3 section of Dechang—Huili expressway in the transition zone between Sichuan and Xizang.Firstly,the cooling laws of SMA-13,AC-20C and AC-20 were analyzed based on theoretical analysis and field measurement.Then,SPSS orthogonal analysis was carried out on three factors,namely air temperature,wind speed and mixture type,so as to obtain the order of their influence on effective rolling time.Additionally,the rolling temperature estimation model of asphalt mixture was established according to the cooling law,and the indoor variable temperature compaction test was carried out to estimate its optimal compaction temperature.Facts and figures show that when the wind speed is less than 6 m/s and the temperature is higher than 5℃,the rolling quality of AC-20C and AC-20 is better.When the wind speed is more than 3 m/s and the temperature is 5~15℃,the rolling quality of SMA-13 is poor.The order of two factors influencing the effective rolling time is air temperature&wind speed>air temperature&mixture type>wind speed&mixture type.The optimal compaction temperature of SMA-13,AC-20C and AC-20 is 169℃,166℃and 152℃,respectively.Finally,the values of field paving and rolling temperature for different types of asphalt mixtures at different air temperatures and wind speeds were recommended based on fractional order theory.
作者
吴霞
何兆益
张思源
甘祥丽
WU Xia;HE Zhaoyi;ZHANG Siyuan;GAN Xiangli(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Architecture Engineering,Jiangxi College of Applied Technology,Ganzhou Jiangxi 341000,China;Sichuan Communications Construction Group Co.Ltd.,Chengdu 610041,China)
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第7期149-163,共15页
Journal of Southwest University(Natural Science Edition)
基金
国家自然科学基金项目(51978116)
江西省自然科学基金面上项目(20202BAB203016)。
关键词
沥青混合料
压实质量
气温
风速
降温规律
实测
asphalt mixture
compaction quality
temperature
wind speed
cooling law
field measurement
