Fibre-reinforced polymer confined-coal rejects concrete: compressive behaviour
Fibre-reinforced polymer confined-coal rejects concrete: compressive behaviour
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DOI：
10.1016/j.compstruct.2022.116063
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发表时间：
2022-08
影响因子：
6.3
通讯作者：
T. Ren;Hongchao Zhao;A. Remennikov;Zhenjun Shan
中科院分区：
文献类型：
--
作者：
T. Ren;Hongchao Zhao;A. Remennikov;Zhenjun Shan
煤矸石混凝土（CRC）是利用煤炭采准和洗选过程中产生的工业副产品配制而成的，通常被认为是天然骨料混凝土（NAC）的替代品。针对混凝土柱强度低、脆性大的缺点，提出了一种新型的结构形式--纤维增强聚合物约束混凝土柱。由于填充CRC的骨料全部来自筛分后的煤矸石，不需要再进行人工破碎，因此，FCCR柱最吸引人的特点是其经济性和环境友好性。为了进一步了解FCCR柱的性能，共制备了10个混合柱，包括6个FCCR和4个FRP约束NAC（FCNA）柱，直径为200 mm，高度为450 mm，并进行了测试。在本研究中测试的主要变量包括FRP厚度和混凝土强度。试验结果表明，在单轴受压条件下，FCCR柱的力学性能与FCNA柱相当。特别是，这些FCCR柱表现出上级的轴向变形能力相比，他们的同行，当低强度CRC填充。与混凝土强度相比，FRP厚度对提高混凝土柱强度和延性的作用更为显著。除了其优越的上级机械性能外，通过增值利用矿山废物而产生的环境效益和减少的碳排放使得FCCR柱成为基础设施或地下空间的理想选择，其中结构形式的大变形能力是最重要的关注点。
Coal rejects concrete (CRC) made of the industry by-product generated during the mining preparation and washing procedure is usually regarded as the alternative to natural aggregate concrete (NAC). To improve the low strength and brittleness of CRC, this paper presents a new structural form, termed fibre-reinforced polymer (FRP)-confined CRC (FCCR) column. The most attractive feature of the FCCR column is its cost-effectiveness and environmental-friendly, because that the aggregates of infilled CRC are all from sieved coal rejects without any more artificial crushing process. To obtain the further understanding on the behaviour of FCCR column, a total of 10 hybrid columns, consisting of 6 FCCR and 4 FRP-confined NAC (FCNA) columns with a diameter of 200 mm and a height of 450 mm, have been prepared and tested. The main variables tested in the present study covered the FRP thickness and the concrete strength. Test results showed that FCCR columns obtained the similar mechanical performance of FCNA under the uniaxial compression. Particularly, these FCCR columns exhibited superior axial deformation ability compared with their counterparts, when the low strength CRC is infilled. Compared to the concrete strength, the effect of FRP thickness in enhancing both the strength and ductility of FCCR columns is much more significant. In addition to their superior mechanical performance, the environmental benefits and reduced carbon emission by add-value use of mine wastes make the FCCR column to be an ideal option for infrastructure or underground spaces where the large deformation ability of structural form is the most important concern.