Shear transfer in fly ash-concrete with electric arc furnace aggregates

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

Magazine of Concrete Research Pub Date : 2023-03-13 DOI:10.1680/jmacr.22.00280

F. Faleschini, Daniel Trento, V. Lopez, M. Zanini

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引用次数: 1

Abstract

This work experimentally evaluates the friction shear behavior of Electric Arc Furnace (EAF) concrete, compared to its reference counterpart made with natural aggregates only. For this scope, two concrete mixes were casted, both containing a blended cement with 30% of fly ash to improve their sustainability. For each mix, other than analyzing the main mechanical properties (compressive, tensile strength and elastic modulus), push-off specimens were tested to obtain the shear strength, failure modes, stress-slip and stress-crack opening curves. The results obtained here clearly identify an enhancement of the shear strength τ of EAF concrete compared to the reference, even though the relation between τ and concrete tensile strength fct is similar between the two concretes. Results are also compared with ones in literature, dealing with ordinary and recycled aggregate concrete (RAC). Further, existing models from both designing codes and literature were applied to the experimental results, obtaining conservative predictions in all cases. The safety margin for the EAF concrete was found to be higher than for the reference concrete.

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电弧炉集料粉煤灰混凝土的剪切传递特性

这项工作实验评估了电弧炉(EAF)混凝土的摩擦剪切行为，与仅用天然骨料制成的参考对照。为此，我们浇铸了两种混凝土混合物，均含有掺30%粉煤灰的水泥，以提高其可持续性。对于每种配合比，除分析其主要力学性能(抗压、抗拉强度和弹性模量)外，还进行推脱试件试验，获得其抗剪强度、破坏模式、应力-滑移和应力-裂纹张开曲线。这里获得的结果清楚地表明，与参考相比，EAF混凝土的抗剪强度τ有所提高，尽管两种混凝土之间的τ与混凝土抗拉强度系数之间的关系相似。结果还与文献中有关普通骨料和再生骨料混凝土(RAC)的研究结果进行了比较。此外，将设计规范和文献中的现有模型应用于实验结果，在所有情况下均获得保守预测。研究发现，电弧炉混凝土的安全裕度高于参考混凝土。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.