尾矿砂改性混凝土的强度与声发射损伤特征研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (10): 3450-3456.

尾矿砂改性混凝土的强度与声发射损伤特征研究

王文杰, 磨季云

武汉科技大学理学院,武汉 430065

收稿日期:2021-04-04 修回日期:2021-04-28 出版日期:2021-10-15 发布日期:2021-11-11
通讯作者: 磨季云,副教授。E-mail:mojiyun@wust.edu.cn
作者简介:王文杰(1994—)男,硕士研究生。主要从事工程材料与数值模拟方面的研究。E-mail:2327767175@qq.com
基金资助:
国家自然科学基金(51004079)

Strength and Acoustic Emission Damage Characteristics of Tailing Sand Modified Concrete

WANG Wenjie, MO Jiyun

School of Science, Wuhan University of Science and Technology, Wuhan 430065, China

Received:2021-04-04 Revised:2021-04-28 Online:2021-10-15 Published:2021-11-11

摘要/Abstract

摘要： 为了研究尾矿砂改性混凝土的受压损伤特征,对4组不同磷矿尾矿砂取代率的混凝土进行了单轴压缩-声发射监测试验。根据混凝土受压损伤时所释放的声发射(AE)信号,定量探讨了材料的损伤程度,并以AE指标为基础分析了混凝土损伤演化特征。结果表明:混凝土的应力-应变曲线可分为弹性变形、塑性变形、断裂破坏和残余变形4个阶段;随着尾矿砂含量增加,混凝土的抗压强度先增加后保持稳定,尾矿砂取代率为30%(质量分数)的改性混凝土峰值抗压强度最大;由AE信号提出了损伤因子,损伤因子-应变曲线表明普通混凝土的结构损伤主要在塑性变形阶段,而尾矿砂改性混凝土的结构损伤集中在塑性变形和断裂破坏阶段;一定比例的磷矿尾矿砂有助于提高水泥砂浆的密实度,从而增强抗压强度和变形性能。这为尾矿砂改性混凝土的研究提供了重要参考。

关键词: 混凝土, 尾矿砂, 应力-应变, 损伤特征, 声发射

Abstract: In order to study the compression damage characteristics of tailing sand modified concrete, uniaxial compression-acoustic emission monitoring tests were carried out on four groups of concrete with different replacement rates of phosphate tailing sand. According to the acoustic emission (AE) signal released by the concrete under compression, the damage degree of the material was quantitatively discussed, and the evolution characteristics of the concrete damage were analyzed based on the AE index. The results show that the stress-strain curve of concrete is divided into four deformation stages: elastic deformation, plastic deformation, fracture failure and residual deformation. With the increase of the content of tailing sand, the compressive strength of concrete increases first and then becomes stable. The peak compressive strength of concrete with tailing replacement rate of 30% (mass fraction) is the highest. Damage factors were obtained from AE signals, and the damage factor-strain curves show that the damage of ordinary concrete structure is mainly in the plastic deformation stage, while the structural damage of tailing sand modified concrete is concentrated in the fracture failure stage. A certain proportion of phosphate tailing sand helps to improve the compactness of cement mortar, thus enhancing the compressive strength and deformation properties. The research results provides an important reference for the modification of concrete with tailing sand.

Key words: concrete, tailing sand, stress-strain, damage characteristic, acoustic emission

中图分类号:

TU528

王文杰, 磨季云. 尾矿砂改性混凝土的强度与声发射损伤特征研究[J]. 硅酸盐通报, 2021, 40(10): 3450-3456.

WANG Wenjie, MO Jiyun. Strength and Acoustic Emission Damage Characteristics of Tailing Sand Modified Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3450-3456.

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