外部硫酸盐侵蚀对纤维增强喷射混凝土拉伸性能的影响

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-02-17 DOI:10.1680/jmacr.23.00251

Renan P. Salvador, R. Serafini, D. Rambo, Alessandra S. Sant'Anna, V. A. Quarcioni, Antonio D. Figueiredo

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引用次数: 0

摘要

本文研究了外部硫酸盐侵蚀（ESA）对钢纤维增强喷射混凝土（SFRSC）的力学性能和微观结构性能的影响。在指定纤维含量为 30 kg/m³、60 kg/m³ 和 90 kg/m³ 的三种不同混合物中使用了 40 mm 长的压接碳钢纤维作为加固材料。从 SFRSC 面板上钻出的圆柱形试样接受了长达 270 天的硫酸盐侵蚀。双冲试验（DPT）用于测定 SFRSC 的基体裂缝强度和裂缝后拉伸强度。每个试样的有效纤维含量都是通过感应试验确定的，随后与力学结果相关联。扫描电子显微镜（SEM）用于评估硫酸盐侵蚀过程中在混凝土孔隙中形成的相。结果表明，纤维加固可减少欧空局引起的开裂。

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Effect of external sulfate attack on the tensile properties of fiber-reinforced sprayed concrete

This paper presents an investigation on the effect of external sulfate attack (ESA) on the mechanical and microstructural properties of steel fiber-reinforced sprayed concrete (SFRSC). Crimped carbon steel fibers, 40 mm-long, were used as reinforcement in three different mixtures with specified fiber contents of 30 kg/m³, 60 kg/m³ and 90 kg/m³. Cylindrical specimens, drilled from SFRSC panels, were subjected to sulfate attack for up to 270 days. Double-punch tests (DPT) were used to determine the matrix crack strength and the post-crack tensile strength of the SFRSC. The effective fiber content of each specimen was determined by inductive tests and subsequently correlated with the mechanical results. Scanning electron microscopy (SEM) was used to evaluate the phases formed in the concrete pores during the sulfate attack. Results indicated that fiber reinforcement may reduce cracking due to ESA.

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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.