关键词: 道路工程, 温拌沥青混合料, 软质沥青, 岩沥青, 施工温度, 节能减排

Abstract: The warm mix asphalt using hard-soft combined binder is made by pre-coating with soft asphalt and then enhancing with hard asphalt． The performance and effect of energy saving and emission reduction of the mix were evaluated based on laboratory tests and the results from the construction and monitoring of the trial section． In addition，comparison was made with HMA and other types of WMA mixes． The results of laboratory tests show the strength of warm mixture asphalt using hard-soft combined binder increases with the time; moreover，this warm mixture asphalt possesses good high temperature stability and fatigue resistance． However，anti-stripping measures should be incorporated to ensure the moisture stability．The results from the onsite monitoring during construction indicate that the warm mix asphalt technology using hard-soft combined binder is able to lower the mix construction temperature effectively，which is significant to energy saving and emission reduction． The emission reduction effect of this warm mix asphalt technology is even better than that using paraffin wax to reduce the viscosity． The monitoring results obtained from a certain asphalt pavement with 2-year service demonstrate that the rut depth of the pavement using this warm mix asphalt technology is only about 50% of those using HMA with the same gradation．

Key words: road engineering, warm mix asphalt, soft asphalt, rock asphalt, construction temperature, energy saving and emission reduction