PET改性高延性碱激发混凝土的断裂性能

doi:10.16552/j.cnki.issn1001-1625.2024.1472

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (7): 2503-2513.DOI: 10.16552/j.cnki.issn1001-1625.2024.1472

PET改性高延性碱激发混凝土的断裂性能

梁振升¹, 张伯涛¹, 梁瑞庆¹, 曾俊锋², 郭永昌²

1.广州电力设计院有限公司,广州 510060;
2.广东工业大学土木与交通工程学院,广州 510060

收稿日期:2024-11-28 修订日期:2025-03-07 出版日期:2025-07-15 发布日期:2025-07-24
通信作者: 梁瑞庆,高级工程师。E-mail:supervisionR@outlook.com
作者简介:梁振升(1980—),男,高级工程师。主要从事变电站工程设计与管理方面的研究。E-mail:15321504870@163.com
基金资助:
国家自然科学基金(12002090)

Fracture Property of PET Modified High DuctilityAlkali-Activated Concrete

LIANG Zhensheng¹, ZHANG Botao¹, LIANG Ruiqing¹, ZENG Junfeng², GUO Yongchang²

1. Guangzhou Electric Power Design Institute Co., Ltd., Guangzhou 510060, China;
2. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510060, China

Received:2024-11-28 Revised:2025-03-07 Published:2025-07-15 Online:2025-07-24

摘要/Abstract

摘要： 利用聚对苯二甲酸乙二醇酯(PET)粉作为骨料制备PET改性高延性碱激发混凝土(PHDAC),在促进高性能混凝土材料绿色发展方面具有巨大潜力。然而,PHDAC的断裂行为模式尚不明确。本文研究了PET粉体积替代石英砂(替代率分别为0%、15%、30%和45%)对PHDAC断裂性能的影响,通过三点弯曲试验分析了PHDAC的破坏模式,基于双K断裂模型计算并分析了PHDAC的起裂韧度Kⁱⁿⁱ_IC、失稳韧度K^un_IC和Ⅰ型断裂能G_F,并结合扫描电子显微镜分析了材料的微观结构,探讨了PET粉对PHDAC断裂行为演变的影响机理和作用机制。结果表明:添加PET粉的试验组均呈现延性断裂特征,采用15%的PET粉替代石英砂能显著提升材料的Ⅰ型断裂能;PET粉末颗粒因疏水特性,与浆体及其他骨料之间形成明显的界面过渡区(ITZ),该ITZ会削弱基体界面致密程度,促进基体开裂,从而使材料整体更易形成多裂缝开裂。

关键词: PET粉, 断裂性能, 碱激发复合材料, 起裂断裂韧度, 失稳断裂韧度, Ⅰ型断裂能

Abstract: The use of polyethylene terephthalate (PET) powder as an aggregate in PET modified high ductility alkali-activated concrete (PHDAC) offers significant potential for advancing sustainable high-performance concrete materials. However, the fracture behavior of PHDAC remains unclear. This study investigated the effects of different PET powder volume replacement ratio (0%, 15%, 30% and 45%) quartz sand on the fracture property of PHDAC. Three-point bending tests were conducted to analyze failure modes, and the dual-K fracture model was used to evaluate crack initiation toughness Kⁱⁿⁱ_IC, instability toughness K^un_IC, and Mode Ⅰ fracture energy G_F. Scanning electron microscopy was employed to examine the material's microstructure, exploring the mechanisms by which PET powder influences fracture behavior. The results indicate that all PET-modified specimens exhibite ductile fracture characteristics, using 15% PET powder replacement quartz sand can significantly enhance Mode Ⅰ fracture energy of the material. Due to its hydrophobic property, PET powder forms a distinct interface transition zone (ITZ) with the slurry and other aggregates, this ITZ reduces interfacial density of the matrix interface, promotes matrix cracking, and makes the material more prone to multi crack cracking as a whole.

Key words: PET powder, fracture property, alkali-activated composite, initiation fracture toughness, unstable fracture toughness, Mode Ⅰ fracture energy

中图分类号:

TU528

梁振升, 张伯涛, 梁瑞庆, 曾俊锋, 郭永昌. PET改性高延性碱激发混凝土的断裂性能[J]. 硅酸盐通报, 2025, 44(7): 2503-2513.

LIANG Zhensheng, ZHANG Botao, LIANG Ruiqing, ZENG Junfeng, GUO Yongchang. Fracture Property of PET Modified High DuctilityAlkali-Activated Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2503-2513.

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PET改性高延性碱激发混凝土的断裂性能

Fracture Property of PET Modified High DuctilityAlkali-Activated Concrete

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