摘要
通过对铁尾矿颗粒粗细程度分析,按照高速路和一级路路面基层集料的技术要求构建数学模型合成铁尾矿碎石级配,并进行无机结合料稳定碎石铁尾矿的重型击实试验和7d龄期无侧限抗压强度试验。试验结果表明:铁尾矿的细度模数为1.3,以26.5mm、4.75mm、0.075mm筛孔的通过率为控制点,建立对数函数模型进行构建碎石和铁尾矿粒径各档级配合成值,合成级配能够满足高速路和一级路路面基层集料的级配要求;当水泥:粉煤灰:碎石:铁尾矿=5∶10∶55∶30时,混合料取得最大干密度2.396g/cm3、最佳含水量5.1%、7d无侧限抗压强度设计值为5.0MPa,强度指标满足在极重、特重交通条件下高速路和一级路路面基层的强度要求。
Based on the analysis of the granularity of iron tailings particles,a mathematical model was constructed to synthesize the crushed stone grading of iron tailings according to the technical requirements of highway and first-level road pavement aggregates,and the heavy compaction test and 7-day age unconfined compressive strength test of crushed stone iron tailings stabilized by inorganic binder were carried out.The test results show that the fineness modulus of iron tailings is 1.3,and taking the pass rate of 26.5mm,4.75mm and 0.075mm mesh as the control point,the logarithmic function model is established to construct the matching value of each grade of particle size of gravel and iron tailings,and the synthetic gradation can meet the requirements of aggregate gradation of highway and first grade pavement base.When cement:fly ash:crushed stone:iron tailings=5∶10∶55∶30,the maximum dry density of the mixture is 2.396g/cm^(3),the optimal water content is 5.1%,and the design value of 7d unconfined compressive strength is 5.0MPa.The strength index can meet the strength requirements of highway and first grade road base under extremely heavy and extra heavy traffic conditions.
作者
王绪旺
Wang Xuwang(School of Urban,Rural Planning and Architectural Engineering,Shangluo University,Shangluo 726000,China)
出处
《粘接》
CAS
2021年第10期118-122,共5页
Adhesion
基金
陕西省科技计划项目(2018GY-099)
商洛学院服务地方专项项目(20FK008)。
关键词
铁尾矿
数学模型
级配合成
力学性能
iron tailings
mathematical model
graded composition
mechanical property
