Fracture analysis of seawater sea-sand recycled aggregate concrete beams: Experimental study and analytical model

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2024-09-26 DOI:10.1016/j.tafmec.2024.104698

Xiangyu Han , Bin Jia , Yu Zeng , Jinqiao Liu , Qilong Zhao , Zhenchao Yang , Qionglin Li , Xiaozhi Hu

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Abstract

Seawater sea-sand recycled aggregate concrete (SSRAC) has garnered significant attention from engineers involved in various coastal engineering projects. Fracture constitutes one of the primary failure modes of SSRAC, and the accurate analysis of its fracture behavior is crucial for application. In this present study, SSRAC with 50% aggregate replacement was subjected to three-point bending tests to evaluate its fracture performance. Specific methodologies for calculating SSRAC fracture toughness were introduced, taking into account the effects of material microstructures and specimen boundaries. By comparing the fracture properties of SSRAC specimens with varying initial notch lengths, the size effect was addressed by using established methods, resulting in a constant fracture toughness value. Furthermore, the methods for analyzing the fracture of un-notched specimens were developed, considering fracture path analysis and the influence of internal defects. Notably, this research demonstrated that small specimens and established methodologies efficiently predict the fracture behavior of larger specimens, providing practical insights for engineering applications.

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海水海砂再生骨料混凝土梁的断裂分析：实验研究与分析模型

海水海砂再生骨料混凝土（SSRAC）引起了参与各种海岸工程项目的工程师的极大关注。断裂是 SSRAC 的主要失效模式之一，准确分析其断裂行为对其应用至关重要。在本研究中，对骨料替代率为 50%的 SSRAC 进行了三点弯曲试验，以评估其断裂性能。考虑到材料微结构和试样边界的影响，介绍了计算 SSRAC 断裂韧性的具体方法。通过比较具有不同初始缺口长度的 SSRAC 试样的断裂性能，使用既定方法解决了尺寸效应问题，从而得出了恒定的断裂韧性值。此外，考虑到断裂路径分析和内部缺陷的影响，还开发了分析无缺口试样断裂的方法。值得注意的是，这项研究表明，小型试样和既定方法可以有效预测大型试样的断裂行为，为工程应用提供了实用见解。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.