The optimum foaming conditions of foamed asphalt were determined by foaming test,and the optimum content of foamed asphalt with different mixing ratios of RAP and RAI was determined by Marshall test.Furthermore,the compressive strength,tensile strength,water stability and dy-namic modulus of foamed asphalt composite cold recycled mixture were tested and analyzed.The re-sults show that the foaming effect of asphalt is the best when the foaming temperature is 160℃ and the foaming water consumption is 2.9％.Under the optimal foaming conditions,the optimal content of foamed asphalt corresponding to the three schemes with 0％,20％and 40％RAP content is 3.4％,3.1％and 2.9％respectively.All three schemes have good compressive strength,tensile strength and water stability,and with the increase of RAP content in foamed asphalt cold recycled mixture,the de-gree of flexibility and tensile strength are gradually increased,but the compressive strength and water stability are reduced.
关键词
半刚性基层沥青路面/复合式冷再生/泡沫沥青/发泡条件/路用性能
Key words
semi-rigid base asphalt pavement/composite cold recycling/foamed asphalt/foamed condi-tion/pavement performance
维普
万方数据