大粒径沥青混凝土降温规律研究-《郑州大学学报(工学版)》

文章信息/Info

作者:: 刘红瑛; 叶松.; 长安大学道路结构与材料交通行业重点实验室,陕西西安,710064, 长安大学道路结构与材料交通行业重点实验室,陕西西安,710064

Author(s):: LIU Hong-ying; YE Song; Key Laboratory of Road Structure and Material of MOC，Chang’an University，Xi’ an 710064, China

Keywords:: large size asphalt mixture ; gradation ; temperature; rule ; construction

摘要:: 大粒径沥青混合料最大公称粒径一般大于26.5 mm,其摊铺厚度可达12～18 cm,其施工工艺尤其是摊铺压实与普通沥青混凝土有较大不同,采用室内模拟降温试验评价了不同类型大粒径沥青混合料的降温规律,试验结果表明:大粒径沥青混合料表面降温速率大,其与混合料中间温差可达到15～25℃,然后保持到表面温度达到碾压终了温度,从而延长了有效压实时间；大粒径沥青混合料施工厚度大,储热能力强,对温度离析没有一般沥青混合料敏感；环境温度和摊铺厚度对大粒径沥青混合料的降温规律有很大的影响,而级配类型的影响相对来说要小的多.

Abstract:: The maximum nominal particle size of large size asphalt mixture is generally greater than 26.5 mm.The asphalt mixture paving thickness is up to 12 ~ 18 cm.The construction technology of the large size asphaltmixture especially compaction technology are quite different.The paper evaluated the cooling law of differenttypes of large size asphalt mixture using the indoor simulated cooling temperature test. The results show thatlarge size asphalt mixture surface cooling rate was greater than HMA，temperature difference between the sur-face and the middle of the mix can reach 15 ~ 25 ℃， and then keep the surface temperature until the rollingfinishing temperature ,thus extending the effective compaction time;the large size asphalt mixture paved thick-ness larger ，thermal energy storage longer，and no sensitive to temperature segregation than the normal asphaltmixture. The environment temperature and paving thickness of large size asphalt mixture have a great influenceto cooling law ， while the gradation type of impact is relatively much smaller.