基于再生胶凝材料的超大粒径碎石基层级配设计方法研究  

Research on the Gradation Design Method of Super Large Particle Size Gravel Base Based on Recycled Cementitious Materials

作　　者：丁希昆 甘新众 刘群艳 李闯民[1] DING Xi-kun;GAN Xing-zhong;LIU Qun-yan;LI Chuang-min(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Yichun HighwayDevelopment Center,Yichun 336000,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙市410114 [2]宜春市公路事业发展中心,宜春市336000

出　　处：《公路》2023年第9期42-49,共8页Highway

基　　金：江西省交通运输厅科技项目,项目编号2022H0010;长沙理工大学专业学位研究生“实践创新与创业能力提升计划”项目,项目编号SJCX202114。

摘　　要：为了探究超大粒径碎石基层材料的级配设计方法,设计达到节能减排、抗开裂要求的基层材料,以颗粒最紧密堆积、实现嵌挤致密混合料结构为目标,依据逐级填充理论和粒子干涉理论,以贝雷法原则优化级配。提出用粉煤灰和矿渣粉两种再生胶凝材料代替水泥作为结合料,提高基层抗开裂性能。基于集料的堆积密度试验,以最小振实矿料间隙率VMA为优化指标,对粗集料级配、细集料级配及再生胶凝材料分别进行设计,提出了超大粒径碎石基层优化级配曲线。最后对设计的超大粒径碎石混合料进行无侧限抗压强度及弯拉强度试验,试验结果表明设计的基于再生胶凝材料的超大粒径碎石基层满足路面半刚性基层材料技术要求。In order to explore the gradation design method of super large particle size gravel base material,the base material that can realize energy saving,emission reduction and anti-cracking is designed.Based on the theory of stepwise packing and particle interference,the gradation is optimized by the principle of Bayley method.Two kinds of recycled cementitious materials,fly ash and slag powder,are proposed to replace cement to improve the cracking resistance of the base.Based on the bulk density test of aggregates,the design of coarse aggregate gradation,fine aggregate gradation and recycled cementing materials is carried out with the minimum voids in mineral aggregate(VMA)under vibrating compaction condition as the optimization index,and the optimization gradation curve of super large particle size gravel base is proposed.Finally,the unconfined compressive strength and flexural tensile strength tests are carried out on the designed super large particle size gravel mixture.The test results show that the designed super large particle size gravel base based on recycled cementitious materials meet the technical requirements of semi-rigid pavement base material.

关 键 词：道路工程 超大粒径碎石基层 级配设计 再生胶凝材料 振实间隙率VMA 

分 类 号：U416.214[交通运输工程—道路与铁道工程]