基于响应面法的聚乙烯醇纤维超高性能混凝土(UHPC)配合比优化设计及微观结构研究

赖光洪; 孙政和; 廖飞宇; 陈宇峰; 张思雅

doi:10.3724/j.gyjzG24022808

基于响应面法的聚乙烯醇纤维超高性能混凝土(UHPC)配合比优化设计及微观结构研究

doi: 10.3724/j.gyjzG24022808

1. 福建农林大学交通与土木工程学院, 福州 350108;
2. 福建建工集团有限责任公司, 福州 350003

基金项目:

国家自然科学基金项目(52378140)

福建省中青年教师教育科研项目(科技类)(JAT231023)

福建建工集团科技项目(Z-Y-2021-0026)。

详细信息

作者简介:
赖光洪,博士,讲师,主要从事土木工程材料研究,laigh@fafu.edu.cn。

通讯作者:
廖飞宇,博士,教授,主要从事钢-混凝土组合结构研究,feiyu.liao@fafu.edu.cn。

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出版历程
- 收稿日期: 2024-02-28
- 网络出版日期: 2024-12-05

Mix Proportion Optimization Design and Microstructure Study of UHPC Containing Polyvinyl Alcohol Fibers Based on Response Surface Method

1. College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou 350108, China;
2. Fujian Construction Engineering Group Company, Fuzhou 350003, China

摘要

摘要: 为探究聚乙烯醇(PVA)纤维对超高性能混凝土(UHPC)力学性能的影响,采用响应面法中的Box-Behnken试验设计方法构建二次多项式回归模型,研究不同胶砂比、硅灰掺量、粉煤灰掺量和偏高岭土掺量对UHPC基体抗压强度的影响,进行优化设计得到PVA纤维UHPC的最佳配合比,并结合扫描电子显微镜(SEM)阐述了PVA纤维UHPC的微观结构变化。结果表明:胶砂比对UHPC基体抗压强度的影响最大,粉煤灰掺量次之,硅灰掺量和偏高岭土掺量影响较小;当胶砂比为1.10、硅灰掺量为4.70%、粉煤灰掺量为18.30%、偏高岭土掺量为6.55%时,UHPC基体的抗压强度达到最大值,此时PVA纤维UHPC的28 d抗压强度和抗拉强度分别为122 MPa、11.5 MPa;PVA纤维与基体表现出良好的黏结性能,具有更致密的微观结构,表现出优异的力学性能,尤其在抗拉性能方面。
- 响应面法 /
- PVA纤维 /
- 配合比优化 /
- 抗压强度 /
- 微观结构
Abstract: To explore the influence of polyvinyl alcohol fibers (PVA fibers) on the mechanical properties of ultra-high performance concrete (UHPC), this work adopted the Box-Behnken test design method in the response surface method to construct a quadratic polynomial regression model and studied the effects of different binder-sand ratio, dosage of silica fume, dosage of fly ash, and dosage of metakaolin on the compressive strength of UHPC matrix. The optimum ratio of UHPC containing PVA fibers was obtained by optimizing the design, and the microstructure of UHPC containing PVA fibers was described by scanning electron microscope (SEM). The results showed that the binder-sand ratio had the greatest influence on the compressive strength of UHPC matrix, followed by the dosage of fly ash, and the dosage of silica fume and metakaolin had a smaller influence; the compressive strength of the UHPC matrix reached its maximum value when the cement-sand ratio was 1.10, the silica fume dosing was 4.70%, the fly ash dosing was 18.30%, and the metakaolin dosing was 6.55%, at which time the 28 d compressive strength and tensile strength of the UHPC containing PVA fibers were 122 MPa and 11.5 MPa, respectively; PVA fibers showed good bonding performance with the matrix, had a denser microstructure, and exhibited excellent mechanical properties, especially in tensile properties.
- response surface method /
- PVA fibers /
- mix proportion optimization /
- compressive strength /
- microstructure

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