An improved understanding on the influence of water-cement ratio and ITZ on fracture mechanisms in concrete

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Magazine of Concrete Research Pub Date : 2023-02-17 DOI:10.1680/jmacr.22.00147

D. Samal, S. Ray

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引用次数: 1

Abstract

Interfacial transition zone (ITZ) is significantly influenced by Water to Cementitious material ratio and governs the overall strength and fracture properties of concrete. Even though an ample number of studies on this line are available in the literature, there is a lack of unified conclusions pertaining to the influence of water-cement ratios on various fracture characteristics and the underlying mechanisms. In this study, an attempt has been made to investigate fracture characteristics such as,size of fracture process zone (FPZ) , fracture energy, traction free crack, toughening mechanisms, etc. in view of varying interfacial transition zone properties and water-cement ratio. Plain concrete beams of size 700×150×80 mm (L×D×B) with varying water-cement ratios have been considered and tested under centre point loading by controlling the crack mouth opening displacement. Acoustic emission (AE) technique has been used for understanding the internal damage parameters. A novel method has been proposed for identifying the traction free-crack tip and the FPZ size using AE event location data at different stages of loading. The role of ITZ on fracture mechanisms in different types of concrete has been critically discussed.Evaluation of fracture energy reveals that its relation with water-cement ratio is affected by the type of concrete.

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更好地理解水灰比和ITZ对混凝土断裂机理的影响

界面过渡区（ITZ）受水胶凝材料比的显著影响，并控制混凝土的整体强度和断裂性能。尽管文献中有大量关于这条线的研究，但关于水灰比对各种裂缝特征和潜在机制的影响，缺乏统一的结论。在本研究中，试图从不同界面过渡区性质和水灰比的角度研究断裂特征，如断裂过程区（FPZ）的大小、断裂能、无牵引裂纹、增韧机制等。通过控制缝口位移，考虑并测试了700×150×80mm（L×D×B）不同水灰比的素混凝土梁在中心点荷载作用下的受力情况。声发射（AE）技术已被用于了解内部损伤参数。提出了一种新的方法，利用不同加载阶段的AE事件定位数据来识别无牵引裂纹尖端和FPZ尺寸。ITZ在不同类型混凝土中的断裂机制中的作用已经得到了严格的讨论。对断裂能的评价表明，断裂能与水灰比的关系受混凝土类型的影响。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.