Fire behavior of high‐contents recycled aggregate concrete composite slabs with small openings

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Structural Concrete Pub Date : 2024-06-26 DOI:10.1002/suco.202400242

Fetih Kefyalew, Thanongsak Imjai, Reyes Garcia, Nguyen Khanh Son

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引用次数: 0

Abstract

Recycled aggregate concrete (RAC) is increasingly being used in the construction of structural elements. However, the performance of RAC elements under fire is usually considered to be inferior to that of normal concrete (NC) elements. This study investigates the fire behavior of RAC composite steel slabs with and without openings. Ten slabs of size of 1.0 m × 2.2 m were cast either with no opening, one or two circular openings, and one or two square openings. Five of the slabs were manufactured with 100% RAC, while the other five slabs were made with NC. The concrete slabs were loaded and subjected to fire tests at a temperature of about 900°C for 120 min. Test results show that RAC composite slabs have lower stiffness (thus larger mid‐span deflections) under fire exposure compared to their counterpart NC slabs. In terms of the recorded temperature–time curves, RAC slabs showed similar performance to that of NC slabs. The ratio of soffit temperature to the temperature at the top of slab was considerably smaller for RAC slabs compared to NC slabs. RAC slabs also showed more spalling than NC slabs. Experimental test results were numerically verified using PyroSim® software with the two showing good agreement. A series of new design charts for composite RAC slabs with desired fire endurance are proposed. This study is expected to promote the wider use of RAC in construction of structural elements, particularly of composite slabs exposed to extreme temperatures.

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具有小开口的高含量再生骨料混凝土复合楼板的防火性能

再生骨料混凝土（RAC）越来越多地用于结构构件的建造。然而，RAC 构件在火灾中的性能通常被认为不如普通混凝土（NC）构件。本研究调查了有开口和无开口 RAC 复合钢板的火灾行为。十块尺寸为 1.0 m × 2.2 m 的板被浇铸成无开口、一个或两个圆形开口、一个或两个方形开口。其中五块板是用 100% 的 RAC 制造的，而另外五块板是用 NC 制造的。对混凝土板进行了加载，并在约 900°C 的温度下进行了 120 分钟的耐火试验。试验结果表明，与 NC 板相比，RAC 复合板在火灾中的刚度较低（因此跨中挠度较大）。从记录的温度-时间曲线来看，RAC 板的性能与 NC 板相似。与 NC 板相比，RAC 板的底部温度与板顶温度之比要小得多。RAC 板的剥落程度也高于 NC 板。使用 PyroSim® 软件对实验测试结果进行了数值验证，两者显示出良好的一致性。研究提出了一系列具有理想耐火性能的复合 RAC 板的新设计图表。这项研究有望促进 RAC 在结构元件建造中的广泛应用，尤其是暴露在极端温度下的复合板。

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

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.