Abstract
In this paper, the basic composition and performance evaluation of the recycled asphalt pavement (RAP) materials were firstly analyzed, and two methods were proposed to evaluate strength characteristics of RAP materials, including a triaxial method for the residual strength and the mortar cementing method for the strength of RAP lump. Then, the cold recycling technology was applied on RAP materials with emulsified asphalt by using vibratory compaction and heavy-duty compaction methods (Proctor compaction method), and the results showed that the maximum dry density obtained by heavy-duty compaction was closer to the actual situation. Finally, the effects of wetting water, emulsified asphalt dosage and curing conditions on the performance of the specimens were investigated. It was found that when the emulsified asphalt was mixed uniformly, whether or not to add the wetting water have almost no effect on the strength of the molded specimens. When the matrix asphalt content of the emulsified asphalt was 30%~60%, the water could be directly added to the cold recycling mixture. The intensity of accelerated curing for two days at 40 °C was approximately equal to that of natural curing for three days, while that of accelerated curing for three days at 40 °C was approximately equal to that of natural curing for seven days, which provided a basis for the short-term laboratory test.
Highlights
At present, a large number of constructed expressways have entered the stage of repairing, renovating and overhaul, the annual production of waste asphalt materials is as high as 230 million tons in China
This paper focuses on the basic composition and performance evaluation of recycled asphalt pavement (RAP) materials, especially the residual strength characteristics
The original particles of >19 mm in the RAP materials can basically be regarded as a particle group composed of a plurality of particles of different particle sizes, and the particles still rely on the bonding effect of old asphalt, the particles of
Summary
A large number of constructed expressways have entered the stage of repairing, renovating and overhaul, the annual production of waste asphalt materials is as high as 230 million tons in China It has been more and more important to recycle and reuse RAP materials for the sustainable development of highway engineering [1,2]. Some of the compaction methods are mainly selected according to different design methods of recycling asphalt mixtures. Wei et al used the method of vibration compaction specimens and determined the maximum dry density and the optimum moisture content of RAP materials [16]. The cold recycling technology of RAP materials have been studied abroad, there is still a lack of research on the accurate evaluation on the residual strength characteristics of RAP materials, the compaction methods of cold recycled mixtures, as well as the effects of composite proportion on the performances [19]. The effects of wetting water, emulsified asphalt dosage and curing conditions on the performance of the specimens were investigated
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