冻融循环后混凝土冲击劈拉强度预测模型

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (2): 448-455.

所属专题：水泥混凝土

冻融循环后混凝土冲击劈拉强度预测模型

胥晔^1,2, 陶俊林^1,2, 李洪祥¹

1.西南科技大学土木工程与建筑学院,绵阳 621010;
2.工程材料与结构冲击振动四川省重点实验室,绵阳 621010

收稿日期:2023-09-11 修订日期:2023-10-18 出版日期:2024-02-15 发布日期:2024-02-05
通信作者: 陶俊林,教授。E-mail:1206309558@qq.com
作者简介:胥晔(1999—),男,硕士研究生。主要从事冲击荷载下脆性材料劈拉性能的研究。E-mail:1371179176@qq.com
基金资助:
国家自然科学基金(12272330)

Prediction Model of Impact Splitting Tensile Strength of Concrete after Freeze-Thaw Cycle

XU Ye^1,2, TAO Junlin^1,2, LI Hongxiang¹

1. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China;
2. Shock and Vibration of Engineering Materials and Structures Key Lab of Sichuan Province, Mianyang 621010, China

Received:2023-09-11 Revised:2023-10-18 Online:2024-02-15 Published:2024-02-05

摘要/Abstract

摘要： 为预测混凝土材料冻融循环后冲击劈拉强度,本文对混凝土标准冻融试件和混凝土劈拉试件进行0、25、50、75、100次的冻融循环试验,通过动弹仪对混凝土标准冻融试件进行动弹性模量测试,采用电液伺服万能试验机和分离式霍普金森压杆系统分别在0.5和0.5×10⁶、1.0×10⁶、2.0×10⁶ kN/s的力加载速率下对劈拉试件进行劈拉试验,分析了冻融损伤以及力加载速率对混凝土冲击劈拉强度的影响。结果表明:随着冻融次数的增加,标准冻融试件的表观状况、质量、相对动弹性模量均不断劣化;当冻融次数一定时,随着力加载速率的提高,混凝土试件的冲击劈拉强度不断提升。在上述试验基础上,建立了冻融循环后混凝土冲击劈拉强度预测模型,该模型可为冻融循环后混凝土冲击劈拉强度的预测提供理论依据。

关键词: 混凝土, 冻融循环, 冲击劈拉强度, 相对动弹性模量, 霍普金森压杆系统, 预测模型

Abstract: In order to predict the impact splitting tensile strength of concrete materials after freeze-thaw cycle, this paper conducted 0, 25, 50, 75 and 100 times freeze-thaw cycle tests on the concrete standard freeze-thaw specimens and the concrete splitting tensile specimens, and tested the dynamic elastic modulus of the concrete standard freeze-thaw specimens through the dynamometer. Electro-hydraulic servo universal testing machine and split Hopkinson pressure bar system were used to perform splitting tensile tests at 0.5, 0.5×10⁶, 1.0×10⁶ and 2.0×10⁶ kN/s, respectively. The effects of freeze-thaw damage and force loading rate on impact splitting tensile strength of concrete were analyzed. The results show that the apparent condition, mass and relative dynamic elastic modulus of standard freeze-thaw specimens deteriorate continuously with the increase of freeze-thaw times. When the freeze-thaw times are constant, the impact splitting tensile strength of concrete specimens increases with the increase of force loading rate. On the basis of the above tests, a prediction model of impact splitting tensile strength of concrete after freeze-thaw cycle is established, which can provide a theoretical basis for the prediction of impact splitting tensile strength of concrete after freeze-thaw cycle.

Key words: concrete, freeze-thaw cycle, impact splitting tensile strength, relative dynamic elastic modulus, Hopkinson pressure bar system, prediction model

中图分类号:

TU528.1

胥晔, 陶俊林, 李洪祥. 冻融循环后混凝土冲击劈拉强度预测模型[J]. 硅酸盐通报, 2024, 43(2): 448-455.

XU Ye, TAO Junlin, LI Hongxiang. Prediction Model of Impact Splitting Tensile Strength of Concrete after Freeze-Thaw Cycle[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 448-455.

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冻融循环后混凝土冲击劈拉强度预测模型

Prediction Model of Impact Splitting Tensile Strength of Concrete after Freeze-Thaw Cycle

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