混杂纤维机制砂混凝土力学性能试验研究

王新; 黄磊群; 覃伟恒; 廖浩宇; 陈宗平

doi:10.13204/j.gyjzG22052305

混杂纤维机制砂混凝土力学性能试验研究

doi: 10.13204/j.gyjzG22052305

1. 广西交通职业技术学院, 南宁 530023;
2. 广西路桥集团建筑工程有限公司, 南宁 530002;
3. 广西大学土木建筑工程学院, 南宁 530004

基金项目:

国家自然科学基金项目（51578163）；八桂学者专项研究项目（〔2019〕79号）；广西科技基地与人才专项（桂科AD21075031）；广西交通职业技术学院陆海交通基础设施混凝土材料与结构研究与应用创新团队项目（交院科研〔2021〕14号）。

详细信息

作者简介:
王新,女,1982年出生,副教授。电子信箱:691303102@qq.com

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出版历程
- 收稿日期: 2022-05-23

Experimental Study on Mechanical Properties of Hybrid Fiber-Reinforced Manufactured Sand Concrete

1. Guangxi Vocational and Technical College of Communications, Nanning 530023, China;
2. Guangxi Road and Bridge Engineering Group Co., Ltd., Nanning 530002, China;
3. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China

摘要

摘要: 为了研究混杂纤维对机制砂混凝土力学性能的影响，以机制砂取代率（0%、50%、100%）和混杂纤维种类（钢-玄武岩纤维、钢-聚丙烯纤维）为变化参数，设计并制作了54个试件，进行了静态抗压试验。观察了试件的受力破坏过程及形态，获取了荷载-位移曲线，并细致分析了混凝土的立方体抗压强度、圆柱体抗压强度、弹性模量、峰值应变、应力-应变曲线和能量演化规律。结果表明：混杂纤维的加入可以使混凝土的破坏模式由脆性转变为延性，而机制砂的加入对混凝土的破坏模式影响不大；混杂纤维的加入改善了混凝土的力学性能，随着机制砂取代率的增加，纤维对混凝土抗压强度和弹性模量的增强作用减弱，当裂缝扩展时，机制砂混凝土的弹性应变能释放率和耗散能转换率均小于天然砂混凝土；相比之下，钢-玄武岩混杂纤维比钢-聚丙烯混杂纤维更有利于改善混凝土的力学性能；最后，提出了力学指标和应力-应变关系的预测算式，且计算结果与试验结果吻合较好。
- 混杂纤维 /
- 机制砂混凝土 /
- 抗压试验 /
- 力学性能 /
- 应力-应变关系
Abstract: To study the mechanical properties of hybrid fiber-reinforced manufactured sand concrete, a tatal of 54 specimens were designed and fabricated for static compression tests taking manufactured sand substitution ratios (0%, 50%, 100%) and types of hybrid fibers (steel-basalt fibres, steel-polypropylene fibres) as variation parameters. The stress damage processes and patterns of the specimens were observed and the load-displacement curves were obtained. The cubic compressive, cylinder compressive, elastic modulus peak strain, uniaxial strain-stress curve and energy transformation relation of concrete were measured. The results showed that addition of fibers could change the failure mode of concrete from brittleness to ductility, while addition of manufactured sand had little effect on failure modes of concrete. Addition of fibers improved the mechanical properties of concrete. With the manufactured sand substitution ratios increased, the enhanced effect of fibers on compressive strength and elastic moduli of concrete decreased. The elastic energy release ratios and dissipation energy increase ratios of manufactured sand concrete were smaller than that of conventional concrete when crack propagated. Comparatively, the hybridization of steel fibers and basalt fibers was more conducive to improve compression property of concrete than the hybridization of steel and polypropylene fibers. Finally, the formulas for predicting the mechanical indices and constitutive model were proposed, and the calculated results were in good agreement with experimental results.
- hybrid fiber /
- manufactured sand concrete /
- compression test /
- mechanical property /
- stress-strain relation

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