泡沫沥青厂拌冷再生混合料级配优化设计

基于对泡沫沥青厂拌冷再生拌和机理的分析，提出了泡沫沥青冷再生混合料级配设计时RAP级配采用水洗法筛分是合适的。不同级配混合料的室内性能试验表明：4．75mm的通过率在45％以上时，混合料具有更优的强度和水稳定性能，较低的0．075mm的通过率（小于6％），并不意味着混合料性能不满足规范要求。在此基础上提出了适合工程实际的优化级配范围。

Optimization Design of Mixture Gradation of Cold in-plant Recycling with Foamed Asphalt

Based on the analyses of mixing mechanism for cold in-plant recycling with foamed asphalt, this paper proposed that the gradation of RAP（ reclaimed asphalt pavement） using washing method is suitable when designing the gradation of cold in-plant recycling with foamed asphalt. Through indoor performance test in diverse gradation of mixture, it is indicated that 4.75 mm percent of pass in 45% or more mixture has better strength and water stability, low O. 075 mm percent of pass （less than 6% ） does not mean that mixture performance can not meet the requirements of specification. Based on this,it puts forward the optimized gradation range suitable for the engineering practice.