Abstract
Through foaming experiment of Zhongtai AH-70 asphalt, the best foaming temperature water consumption and influence factors of foamed asphalt’s foaming features are determined; By designing the proportion of foamed asphalt cold in-place recycled mixture combined with the water stability experiment, for this mixture the best foamed asphalt addition is 3%, and proportion of the mixture is RAP: fine aggregate: cement=75:23:2. Using SEM technology, the mechanism of increasing on the intensity of foamed asphalt mixture resulted by the addition of cement was analysed. This research provides reference for cement admixture’s formulation in the designing of foamed asphalt cold in-place recycled mixture.
Highlights
In China, the total length of the national road was 469.63 million kilometres by the end of 2016
Before using foamed asphalt cold regeneration technique to renovate road pavement, the proportion of mixture should be designed by laboratory research
It is shown that at the same temperature, the foamed asphalt’s half-life decreases with the increase of water consumption
Summary
In China, the total length of the national road was 469.63 million kilometres by the end of 2016. When foamed asphalt comes into contact with the aggregate, it suddenly becomes millions of tiny particles and spreads on the surface of the fine aggregate especially particle size less than 0.075 mm. This kind of the fine aggregate with foamed asphalt can be filled in the gap between the coarse aggregate and after mixing and compacting, the asphalt rubber paste is formed that makes the mixture a certain cohesion and strength[3,4]. The cold regeneration technique of recycled waste road materials by foamed asphalt has been famous for its remarkable advantages in energy saving, environmental protection and economy[5,6,7].
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