SRX聚合物稳定级配碎石动态模量影响因素研究  

Influencing Factors of Dynamic Modulus of SRX Polymer Stable Gradation Crushed Stone

作　　者：张新强 唐伯明[1,2] 朱洪洲 欧力[1] ZHANG Xinqiang;TANG Boming;ZHU Hongzhou;OU Li(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;National and Local Joint Engineering Laboratory of Materials for Traffic Civil Engineering,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]交通土建工程材料国家地方联合工程实验室,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2022年第12期94-98,127,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(50808189,51978115);云南省交通运输厅科技计划项目[云交科2014(A)09];材料工程重庆市研究生联合培养基地项目(201907);重庆市研究生科研创新项目(2021B0002)。

摘　　要：为了研究SRX聚合物稳定级配碎石动态模量影响因素及SRX聚合物作用机理,采用正交分析方法,研究了SRX掺量(0.25%、0.5%、0.75%)、养护时间(2、6、10 d)、围压(34、69、103 kPa)对动态模量的影响,并基于扫描电镜分析了SRX聚合物作用机理。结果表明:掺加SRX聚合物能够显著提升级配碎石动态模量,且SRX聚合物稳定级配碎石表现出较强的应力依赖性;养护时间对SRX聚合物稳定级配碎石动态模量值影响最为显著,其次为SRX掺量与围压;SRX聚合物均匀裹附于级配碎石表面,在集料表面形成一层致密的黏膜,不同集料通过SRX聚合物相互黏结。In order to study the influencing factors of the dynamic modulus of SRX polymer stabilized graded crushed stone and the action mechanism of SRX polymer, the orthogonal analysis method was used to study the influence of SRX content(0.25%, 0.5%, 0.75%), curing age(2, 6, 10 d) and confining pressure(34, 69, 103 kPa) on the dynamic modulus. Moreover, the action mechanism of SRX polymer was analyzed based on SEM. The results show that the addition of SRX polymer can significantly increase the dynamic modulus of graded crushed stone, and the stable graded crushed stone of SRX polymer exhibits a stronger stress dependence. Curing time has the most significant effect on the dynamic modulus of SRX polymer stabilized graded crushed stone, followed by SRX content and confining pressure. SRX polymer is uniformly coated on the surface of graded crushed stone, forming a layer of dense mucosa on the aggregate surface, and different aggregates are bonded to each other by SRX polymer.

关 键 词：道路工程 SRX聚合物稳定级配碎石 动态模量 动三轴实验 正交试验 

分 类 号：U414[交通运输工程—道路与铁道工程]