Composite Structures ( IF 6.3 ) Pub Date : 2021-01-26 , DOI: 10.1016/j.compstruct.2021.113621 Hongchao Zhao , Ting Ren , Alex Remennikov
The relatively low strength and brittleness are believed to be two main factors restricting the widely use of coal reject concrete (i.e. CRC) in practical applications. This paper presents a concept of the novel hybrid concrete column incorporating fibre-reinforced polymer (i.e. FRP), termed FRP-confined CRC (i.e. FCCR) columns, to widen the use of CRC. The systematic compression tests on natural aggregates concrete (i.e NAC) and CRC with the large range replacement ratios of natural aggregates in volume (i.e. 0%, 25%, 50%, 75% and 100%) were firstly carried out, followed by the compressive tests on FCCR columns. Test variables covered the thickness of FRP jacket (i.e.0-ply, 2-ply and 4-ply), the replacement ratio of natural aggregates and the particle size of coal reject. In parallel, the FRP-confined NAC columns (i.e. FCNA) columns have been prepared and tested for comparison. Test results showed that the compressive strength of CRC decreases with the increased replacement ratio of natural aggregates. When the CRC is confined by the exterior FRP jacket, both the compressive strength and the ductility of which have been significantly enhanced. Furthermore, these FCCR columns with a thicker FRP jacket generally exhibited the superior compressive behaviour. The analysis-oriented model developed by Jiang and Teng for FCNA was adopted to predict the compressive behaviour of FCCR. The feasibility of Jiang and Teng’s model for predicting the behaviour of FCCR with the replacement of fine aggregate was verified.
中文翻译:
FRP约束煤reject石混凝土柱的轴向受压性能
相对较低的强度和脆性被认为是限制煤reject石混凝土(即CRC)在实际应用中的广泛使用的两个主要因素。本文提出了一种新型混合混凝土柱的概念,该柱结合了纤维增强聚合物(即FRP),称为FRP约束CRC(即FCCR)柱,以扩大CRC的使用范围。首先对天然骨料混凝土(NAC)和CRC进行了系统的压缩试验,其中天然骨料的体积替换率范围较大(即0%,25%,50%,75%和100%),然后进行在FCCR色谱柱上进行压缩试验。测试变量涵盖了FRP护套的厚度(即0层,2层和4层),天然骨料的替代率和煤reject石的粒径。同时,使用FRP限制的NAC列(即 已准备并测试了FCNA)色谱柱以进行比较。试验结果表明,随着天然骨料替代率的增加,CRC的抗压强度降低。当CRC受外部FRP护套限制时,其抗压强度和延展性均得到显着提高。此外,这些具有较厚FRP夹套的FCCR色谱柱通常表现出优异的抗压性能。采用江和滕为FCNA开发的面向分析的模型来预测FCCR的压缩行为。验证了江和滕模型预测细粉骨料替代FCCR行为的可行性。当CRC受外部FRP护套限制时,其抗压强度和延展性均得到显着提高。此外,这些具有较厚FRP夹套的FCCR色谱柱通常表现出优异的抗压性能。采用江和滕为FCNA开发的面向分析的模型来预测FCCR的压缩行为。验证了江和滕模型预测细粉骨料替代FCCR行为的可行性。当CRC受外部FRP护套限制时,其抗压强度和延展性均得到显着提高。此外,这些具有较厚FRP夹套的FCCR色谱柱通常表现出优异的抗压性能。采用江和滕为FCNA开发的面向分析的模型来预测FCCR的压缩行为。验证了江和滕模型预测细粉骨料替代FCCR行为的可行性。采用江和滕为FCNA开发的面向分析的模型来预测FCCR的压缩行为。验证了江和滕模型预测细粉骨料替代FCCR行为的可行性。采用江和滕为FCNA开发的面向分析的模型来预测FCCR的压缩行为。验证了江和滕模型预测细粉骨料替代FCCR行为的可行性。