摘要
再生沥青混合料常面临水稳定性不足的风险。为研究再生沥青混合料水稳定性的变化趋势,本研究设计了3种RAP掺量(0%、30%、50%)的再生沥青混合料,采用不同次数(0、1、3、6、9、10)的冻融循环试验,测定再生沥青混合料的空隙率、冻融劈裂抗拉强度比指标,评估再生沥青混合料的水稳定性。结果表明:再生沥青混合料的空隙率随着RAP掺量的增加而减小;随着冻融循环次数增加,不同RAP掺量的再生沥青混合料的空隙率呈增长趋势,增长速度先快后慢,逐渐趋于稳定;不同RAP掺量的再生沥青混合料劈裂强度随冻融次数的增加呈下降趋势,下降速度先快后慢,逐渐趋于稳定;30%RAP掺量的再生沥青混合料水稳定性最佳,0%RAP掺量的次之,50%RAP掺量的最小;空隙率与再生沥青混合料的劈裂抗拉强度成反比。
Recycled asphalt mixes often face the risk of insufficient moisture stability. In order to study the trend of moisture stability of recycled asphalt mixes,three kinds of recycled asphalt mixes with different dose of RAP(0%,30%,50%) were designed,and different numbers of freeze-thaw cycles(0,1,3,6,9,10) were used to determine the air voids and freeze-thaw splitting tensile strength ratio indexes of recycled asphalt mixes to evaluate the moisture stability of recycled asphalt mixture. The results showed that the air voids of recycled asphalt mixture decreased with the increase of RAP;with the increase of freeze-thaw cycles,the air voids of recycled asphalt mixture with different RAP dose showed an increasing trend,and the growth rate was fast and then slow,and gradually stabilized;the splitting strength of different RAP dose showed a decreasing trend with the increase of freeze-thaw cycles,and the decrease rate was fast and then slow,and gradually stabilized. The moisture stability of recycled asphalt mixture containing 30% RAP is the best,followed by 0% RAP,and 50% RAP is the smallest. The air voids is inversely proportional to the splitting tensile strength of recycled asphalt mixture.
作者
陶莉萍
TAO Liping(Beijing Urban Construction Huasheng Transportation Engineering Co.,Ltd.,Beijing 102444,China)
出处
《交通节能与环保》
2022年第3期87-91,共5页
Transport Energy Conservation & Environmental Protection
关键词
道路工程
再生沥青混合料
冻融循环
空隙率
水稳定性
road engineering
recycled asphalt mixture
freeze-thaw cycles
air voids
moisture stability
