PVA纤维类型对应变硬化地聚合物基复合材料力学性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (11): 3693-3701.

PVA纤维类型对应变硬化地聚合物基复合材料力学性能的影响

朱弘康¹, 林常¹, 蔡舒², 徐树英¹, 潘莉莎¹

1.海南大学化学工程与技术学院,海口 570228;
2.天津大学材料科学与工程学院,天津 300072

收稿日期:2021-05-14 修回日期:2021-06-25 出版日期:2021-11-15 发布日期:2021-12-08
通讯作者: 林常,博士,副教授。E-mail:clin@hainanu.edu.cn
作者简介:朱弘康(1995—),男,硕士研究生。主要从事纤维增强水泥基复合材料的优化设计及性能研究。E-mail:1051128007@qq.com
基金资助:
海南省自然科学基金(520RC550);国家自然科学基金(51608157);天津大学-海南大学自主创新基金合作项目(HDTDU201901)

Influence of PVA Fiber Type on Mechanical Properties of Strain-Hardening Geopolymer Composites

ZHU Hongkang¹, LIN Chang¹, CAI Shu², XU Shuying¹, PAN Lisha¹

1. School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China;
2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China

Received:2021-05-14 Revised:2021-06-25 Online:2021-11-15 Published:2021-12-08

摘要/Abstract

摘要： 本文对比分析了4种不同聚乙烯醇(PVA)纤维分别在不同配合比地聚合物基体中的增韧作用,为利用国产无表面涂油PVA纤维制备应变硬化地聚合物基复合材料(SHGC)提供实验数据。主要研究矿渣与粉煤灰的比例、碱溶液的浓度、纤维尺寸以及纤维表面特性等因素对地聚合物基复合材料抗压和直接拉伸性能的影响。结果表明,经过7 d室温养护,含矿渣的地聚合物基体和复合材料的抗压强度均高于30 MPa,而纯粉煤灰地聚合物基体和复合材料的抗压强度较低,为12~15 MPa。表面涂油PVA纤维SHGC的延展性普遍高于无表面涂油PVA纤维SHGC。然而,通过调节地聚合物基体配合比,可以提高无表面涂油PVA纤维的增韧效果。当粉煤灰质量分数为33%时,无表面涂油PVA纤维SHGC的极限拉伸应变达1.44%,与表面涂油PVA纤维SHGC相当。在纯粉煤灰的情况,4种PVA纤维复合材料均呈现出稳定的多缝开裂和应变硬化特征。

关键词: PVA纤维, 应变硬化地聚合物基复合材料, 直接拉伸试验, 粉煤灰, 矿渣, 力学性能

Abstract: The toughening effects of four types of polyvinyl alcohol (PVA) fibers in geopolymer matrices with different mix proportions were investigated, which can provide experimental data for the preparation of strain-hardening geopolymer composites (SHGC) reinforced with domestic PVA fibers without surface oil coating. The focus was on the influences of the ratio of slag to fly ash, concentration of alkaline solution, dimensions and surface properties of fibers and the like on the compressive and direct tensile properties of SHGC. The compressive testing results show that the matrices and composites containing slag have a compressive strength more than 30 MPa, and those with plain fly ash ranging from 12 MPa to 15 MPa. The direct tensile testing results show that the ductility of SHGC with oil-coated PVA fibers is generally higher than that of SHGC with non-oil-coated PVA fiber. However, the toughening effect of domestic PVA fibers can be enhanced by tailoring the mix proportion of matrices. For the case where the dosage of fly ash is 33% (by mass), SHGC reinforced with non-oil-coated PVA fibers displays a value in ultimate strain up to 1.44%, comparable with that of SHGC with oil-coated PVA fibers. For the case of plain fly ash, geopolymer composites reinforced with any one of the four types of PVA fibers exhibit stable multiple cracking and strain-hardening behavior.

Key words: PVA fiber, strain-hardening geopolymer composite, direct tensile test, fly ash, slag, mechanical property

中图分类号:

TB332

朱弘康, 林常, 蔡舒, 徐树英, 潘莉莎. PVA纤维类型对应变硬化地聚合物基复合材料力学性能的影响[J]. 硅酸盐通报, 2021, 40(11): 3693-3701.

ZHU Hongkang, LIN Chang, CAI Shu, XU Shuying, PAN Lisha. Influence of PVA Fiber Type on Mechanical Properties of Strain-Hardening Geopolymer Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3693-3701.

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