PVA-铁尾矿砂混凝土抗折性能研究

摘要/Abstract

摘要： 为实现固废再生利用,将铁尾矿砂部分替代细骨料并掺入PVA纤维,制备出具有良好和易性的PVA-铁尾矿砂混凝土,通过标准抗折试验研究了不同铁尾矿砂替代率与PVA纤维掺量对混凝土抗折性能的影响。研究表明,PVA纤维掺量为0%和0.1%(质量分数,下同)时试件发生贯通型开裂脆性破坏,而PVA纤维掺量为0.2%和0.3%的试件破坏时裂缝宽度明显减小且未贯通。当铁尾矿砂替代率为30%、PVA纤维掺量为0.3%时,试件跨中挠度和抗折强度均达到最大值,较普通混凝土分别提高了22.04%和6.57%。当铁尾矿砂替代率超过30%时试件抗折强度和跨中挠度会显著下降。与单掺PVA纤维相比,混掺PVA纤维与铁尾矿砂的试件变形能力增强更明显。由XRD谱可知,30%铁尾矿砂替代率下试件中C-S-H凝胶与钙矾石生成量最多,能显著提高材料强度。

关键词: 混凝土, 铁尾矿砂, PVA纤维, 抗折性能, 替代率, 纤维掺量

Abstract: In order to achieve the recycling and utilization of solid waste, iron ore tailings were partially replaced with fine aggregates and added with PVA fibers to prepare PVA-iron ore tailings concrete with good workability. The influences of different iron ore tailings replacement rates and PVA fiber content on the flexural performance of concrete were studied through standard flexural tests. The result show that when the PVA fiber content is 0% and 0.1% (mass fraction, the same below), the specimens undergo through type brittle cracking failure. When the PVA fiber content is 0.2% and 0.3%, the crack width of specimens significantly decreases and does not penetrate. When the iron ore tailings replacement rate is 30% and the PVA content is 0.3%, the mid-span and flexural strength of specimen reach their maximum values, which has increased by 22.04% and 6.57% compared to ordinary concrete, respectively. When iron ore tailings replacement rate exceeds 30%, the flexural strength and deflection will significantly decrease. Compared to the single addition of PVA fiber, the deformation ability of specimens mixed with PVA fiber and iron ore tailings is more significantly enhanced. It can be seen from the XRD pattern that the C-S-H gel and ettringite are the most abundant under the 30% iron ore tailings replacement rate, which can significantly improve the strength of material.

Key words: concrete, iron ore tailings, PVA fiber, flexural performance, replacement rate, fiber content

中图分类号:

TU528

朱利帅, 谢群, 惠婧, 赵鹏, 李俊锋. PVA-铁尾矿砂混凝土抗折性能研究[J]. 硅酸盐通报, 2024, 43(2): 593-602.

ZHU Lishuai, XIE Qun, HUI Jing, ZHAO Peng, LI Junfeng. Flexural Performance of PVA-Iron Ore Tailings Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(2): 593-602.

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