针片状骨料含量对沥青混凝土骨料级配的影响研究  

Influence of needle-shaped flake aggregate content on asphalt concrete aggregate gradation

作　　者：李炎隆[1] 赵栋 LI Yanong;ZHAO Dong(State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学省部共建西北旱区生态水利国家重点实验室,西安710048

出　　处：《水力发电学报》2024年第9期94-105,共12页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金重点项目(52039008);国家杰出青年科学基金项目(52125904)。

摘　　要：为研究针片状骨料含量对沥青混凝土骨料级配的影响,本文采用逐级填充法,选用骨架稳定性为衡量骨架级配优劣的唯一指标,考虑针片状含量为0%、20%、25%、30%、35%,利用垂直振动压实仪成型试件。结合加州承载比(CBR)值、骨架密度与空隙率综合评价骨架稳定性,以此确定各组粗骨料级配。采用合成级配的设计方法,将粗细集料进行全粒径骨料级配设计。结果表明,随着针片状骨料含量的增加,全粒径骨料骨架稳定性呈现先增后减的趋势,其中针片状骨料含量为30%的骨架稳定性最优,针片状骨料含量35%的稳定性最劣。This study examines the influence of needle flake aggregate content on the gradation of asphalt concrete aggregate,using a stepwise filling method and adopting skeletal stability as the sole criterion for assessing the quality of aggregate skeleton.A vertical vibration compaction device is used to prepare the specimens with needle flake contents of 0%,20%,25%,30%,and 35%,respectively;Skeletal stability is evaluated comprehensively by combining the California bearing ratio(CBR)value,skeletal density,and porosity to determine the coarse aggregate gradation for different specimen sets.Aggregate gradation is designed using a composite gradation design method through blending coarse and fine fractions across the full-size range.The findings indicate that with an increasing content of needle-like aggregates,the stability of aggregate skeleton takes a trend of initial increase and then decrease.The optimal stability is observed at a needle flake content of 30%,while the least favorable is at the content of 35%.

关 键 词：水工沥青混凝土 针片状骨料 骨料级配 垂直振动压实 CBR指标 

分 类 号：TV41[水利工程—水工结构工程]