循环压缩作用下铁尾矿砂混凝土变形破坏试验研究

丁浩珉

doi:10.11988/ckyyb.20221688

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raybet体育在线院报 ›› 2024, Vol. 41 ›› Issue (5) : 195-202. DOI: 10.11988/ckyyb.20221688

水工结构与材料

循环压缩作用下铁尾矿砂混凝土变形破坏试验研究

丁浩珉

作者信息 +

Deformation and Failure of Iron Tailings Sand Concrete under Cyclic Compression

DING Hao-min

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文章历史 +

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。

Abstract

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.

导出引用

丁浩珉. 循环压缩作用下铁尾矿砂混凝土变形破坏试验研究[J]. raybet体育在线院报. 2024, 41(5): 195-202 https://doi.org/10.11988/ckyyb.20221688

DING Hao-min. Deformation and Failure of Iron Tailings Sand Concrete under Cyclic Compression[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(5): 195-202 https://doi.org/10.11988/ckyyb.20221688

中图分类号： TU521.1

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