SAP内养护混凝土断裂过程声发射特性

摘要/Abstract

摘要： 基于三点弯曲试验,研究了高吸水性树脂(SAP)混凝土缺口梁在不同加载速率下的损伤特性。采用声发射(AE)技术监测断裂损伤过程,通过荷载-裂缝张开口位移(P-CMOD)曲线计算峰值能量和累积能量的变化,采用RA-AF关联分析法对缺口梁损伤时释放的AE信号进行了损伤模式分析。试验结果表明:随着加载速率的增加,SAP混凝土强度增加,拉伸型裂缝的比例显著降低;而随着SAP含量的提升,相同加载速率下SAP混凝土的强度降低,拉伸型裂缝的比例呈先增加后降低的趋势,适当的SAP可以增加拉伸型裂缝的比例。研究结果可为SAP混凝土在工程中的实际应用提供参考。

关键词: 高吸水性树脂, 混凝土, 内养护, 三点弯曲试验, 声发射, 损伤演化

Abstract: Based on three-point bending test, the damage characteristics of notched beams of super absorbent polymer (SAP) concrete were researched at various loading rates. The fracture damage process was monitored by employing the acoustic emission (AE) technique. Variation of peak energy and cumulative energy were calculated by using the load-crack mouth opening displacement (P-CMOD) curves, and the damage mode of AE signals released during the damage of notched beams was analyzed by RA-AF correlation analysis. The results indicates that the strength of SAP concrete increases and the proportion of tensile-type fractures significantly decreases with the increase of loading rate. With the increase of SAP content, the strength of SAP concrete decreases at an equivalent loading rate, and the proportion of tensile-type cracks increases first and then decreases. Appropriate SAP can increase the proportion of tensile-type cracks. The research results can provide reference for the practical application of SAP concrete in engineering.

Key words: super absorbent polymer, concrete, internal curing, three-point bending test, acoustic emission, damage evolution

中图分类号:

TU528.1

金子恒, 谢发祥, 蔡定鹏, 韩旭, 掌昀. SAP内养护混凝土断裂过程声发射特性[J]. 硅酸盐通报, 2023, 42(7): 2419-2428.

JIN Ziheng, XIE Faxiang, CAI Dingpeng, HAN Xu, ZHANG Yun. Acoustic Emission Properties of Fracture Process of Internally Cured Concrete with Super Absorbent Polymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2419-2428.

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