摘要
为了研究不同矿料级配对温拌橡胶沥青混合料性能的影响规律,通过对SMA中各粒径集料含量进行调整,选择5种具有代表性级配对比AC级配进行大量室内试验,分析不同级配对温拌橡胶沥青混合料体积指标及路用性能影响。试验结果表明,达到相同性能指标时,温拌橡胶沥青混合料击实温度较热拌橡胶沥青混合料可降低30℃左右,不同级配混合料对马歇尔体积指标有较大的影响。为满足形成SMA结构条件,要求关键筛孔通过率不能超过28.2%,采用SMA间断级配温拌橡胶沥青混合料较AC连续级配具有更好的高、低温稳定性能和水稳定性能,并且在SMA结构类型中适当增加粗集料含量对混合料性能有较大的改善。建议选择较粗间断级配作为温拌橡胶沥青混合料设计级配。
In order to investigate the regularity of effect of different aggregate gradations on the performance rubberized WMA, through adjusting the contents of different sized aggregates in SMA, 5 kinds of representative gradations are selected for several indoor comparative experiments with AC aggregate gradation, and the effect of different gradations on volume index and road performance of rubberized WMA analyzed. The test results show that （ 1 ） the compaction temperature of rubberized WMA can be decrease by 30℃ compared with that of rubberized HMA; （2） different gradations has large effect on the Marshall volume index. In order to form SMA, the passing rate of key sieve should not exceed 28. 2% , the gap gradation of SMA has better high-temperature stability, low-temperature stability and water stability compared with continuous gradation of AC. Properly increasing the coarse aggregate content into SMA can improve the performance of the mixture. It is suggested to choose relatively coarse gap gradation as the design gradation of rubberized WMA.
出处
《公路交通科技》
CAS
CSCD
北大核心
2014年第3期32-37,共6页
Journal of Highway and Transportation Research and Development
关键词
道路工程
路用性能
马歇尔试验
矿料级配
粗集料含量
road engineering
road performance
test
aggregate gradation
coarse aggregate content
