lower seal

The upper and lower seal valve are changed from that of crank structure to straight arm structure that only actuates single action, as a result, the equipment failure rate and unscheduled down time are reduced;

上下密封阀由直动+转动的曲臂结构改为转动单一动作的直臂结构，减少了设备故障率和非计划检修时间；

Application of Lower Seal Coat of Single Hot Bituminous Surface Treatment with Premixed Macadam to Kai-Yang Expressway

热沥青单层表处（预拌碎石）下封层在开阳高速公路的应用

Experimental Study on Emulsified Asphalt Material for Lower Seal Coat

乳化沥青下封层材料的试验研究

On the basis of the Kai Yang Expressway construction practice, the application of single hot bituminous surface treatment with premixed macadam to the lower seal coat is discussed and a foundation for the further study of bituminous seal coat design and construction given.

通过开阳高速公路下封层的施工实际，介绍和探讨预拌碎石热沥青单层表处在下封层施工中的应用，为沥青路面封层设计和施工提供有益的探索。