循环压缩作用下铁尾矿砂混凝土变形破坏试验研究  

Deformation and Failure of Iron Tailings Sand Concrete under CyclicCompression

作　　者：丁浩珉 DING Hao-min(Jiangsu Police Institute,Nanjing 210031,China)

机构地区：[1]江苏警官学院,南京210031

出　　处：《长江科学院院报》2024年第5期195-202,共8页Journal of Changjiang River Scientific Research Institute

基　　金：2022年江苏省高校哲学社会科学研究基金项目(2022SJYB0464);江苏省基建教育基本建设学会2021年度重点研究项目(jyjb2021D003)。

摘　　要：为了研究循环压缩对不同铁尾矿砂掺量的混凝土疲劳损伤的影响,对铁尾矿砂混凝土开展了拌合物性能和变幅循环压缩试验。结果表明:铁尾矿砂混凝土吸水率均大于普通混凝土且吸水率随掺量增加而增大;铁尾矿砂掺量在40%以内时混凝土流动性较好,且压力泌水率属于可泵送空间;掺有铁尾矿砂的混凝土的循环受压应力-应变曲线由密变疏且变形相对普通混凝土较小;加载变形模量在临近破坏时会突然降低,总输入能和弹性应变能增长速率随着循环受压次数的增加而增大,而耗散能先缓慢增大之后迅速增大。To explore the impact of cyclic compression on fatigue damage in concrete with varying iron tailings sand content,we conducted mixture performance assessments and variable-amplitude cyclic compression tests on iron tailings sand concrete.Our findings reveal that the water absorption of iron tailings sand concrete surpasses that of ordinary concrete,escalating with dosage increments.Below a 40%iron tailings sand content,concrete exhibits enhanced fluidity and maintains a pumpable state in terms of pressure bleeding rate.The stress-strain curve of iron tailings sand concrete during cyclic compression transitions from dense to sparse,with deformation levels lower than those of ordinary concrete.Near failure,the loading deformation modulus experiences a sudden decline.Total input energy and elastic strain energy exhibit accelerated growth rates with increasing cyclic compression times,while dissipation energy shows a gradual increase followed by a rapid surge.

关 键 词：铁尾矿砂 混凝土 拌合物性能 变幅循环压缩 

分 类 号：TU521.1[建筑科学—建筑技术科学]