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一种在自密实轻集料混凝土中使用废旧轮胎碎料作为细集料的新型复合板。

A New Composite Slab Using Crushed Waste Tires as Fine Aggregate in Self-Compacting Lightweight Aggregate Concrete.

作者信息

Lv Jing, Zhou Tianhua, Wu Hanheng, Sang Liurui, He Zuoqian, Li Gen, Li Kaikai

机构信息

School of Civil Engineering, Chang'an University, Xi'an 710061, China.

出版信息

Materials (Basel). 2020 Jun 3;13(11):2551. doi: 10.3390/ma13112551.

DOI:10.3390/ma13112551
PMID:32503286
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7321477/
Abstract

A composite slab comprised of self-compacting rubber lightweight aggregate concrete (SCRLC) and profiled steel sheeting is a new type of structural element with a series of superior properties. This paper presents an experimental research and finite element analysis (FEA) of the flexural behavior of composite slabs consisting of SCRLC to develop a new floor system. Four composite slabs specimens with different shear spans (450 mm and 800 mm) and SCRLC (0% and 30% in rubber particles substitution ratio) are prepared, and the flexural properties including failure modes, deflection at mid-span, profiled steel sheeting, and concrete surface stain at mid-span and end slippage are investigated by four-point bending tests. The experimental results indicate that applying SCRLC30 in composites slabs will improve the anti-cracking ability under the loading of composite slabs compared with composite slabs consisting of self-compacting lightweight aggregate concrete (SCLC). FEM on the flexural properties of SCRLC composites slabs show that the yield load, ultimate load, and deflection corresponding to the yield load and the ultimate load of composite slabs drop as the rubber particles content increases in SCRLC. The variation of SCRLC strength has less impact on the flexural bearing capacity of corresponding composite slabs. Based on the traditional calculated method of the ultimate bending moment of normal concrete (NC) composite slabs, a modified calculated method for the ultimate bending moment of SCRLC composite slabs is proposed.

摘要

由自密实橡胶轻集料混凝土（SCRLC）和压型钢板组成的组合板是一种具有一系列优越性能的新型结构构件。本文对由SCRLC组成的组合板的抗弯性能进行了试验研究和有限元分析（FEA），以开发一种新的楼盖体系。制备了四个具有不同剪跨（450mm和800mm）和SCRLC（橡胶颗粒替代率为0%和30%）的组合板试件，并通过四点弯曲试验研究了其抗弯性能，包括破坏模式、跨中挠度、压型钢板、跨中混凝土表面应变和端部滑移。试验结果表明，与由自密实轻集料混凝土（SCLC）组成的组合板相比，在组合板中应用SCRLC30将提高组合板在荷载作用下的抗裂能力。SCRLC组合板抗弯性能的有限元分析表明，随着SCRLC中橡胶颗粒含量的增加，组合板的屈服荷载、极限荷载以及对应于屈服荷载和极限荷载的挠度均下降。SCRLC强度的变化对相应组合板的抗弯承载力影响较小。基于普通混凝土（NC）组合板极限弯矩的传统计算方法，提出了SCRLC组合板极限弯矩的修正计算方法。

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