万博体育bet 土木工程学院王俊教授团队在国际权威学术期刊《Journal of Building Engineering》（中科院二区，影响因子7.144））上发表题为“Development of a novel rapid repairing agent for concrete based on GFRP waste powder/GGBS geopolymer mortars”的研究论文。课题组提出以回收玻纤复材(GFRP)粉末和矿渣为碱活性材料，开发了一种新型地聚物砂浆。研究表明当GFRP粉末含量为20%时，地聚物砂浆的初凝和终凝时间分别为23min和30min，6小时和1天的抗压强度分别达到15.2MPa和35.7MPa，满足JC/T 2381-2016规范要求。加入GFRP粉末可显著提升矿渣地聚物砂浆的韧性。斜剪试验结果表明，当修复时间从3天增加到7天和28天时，地聚物砂浆修复混凝土棱柱的破坏形式从界面破坏转变为劈裂破坏和混凝土基体爆裂。微观分析表明地聚物砂浆与混凝土形成了一个致密的界面过渡区，从而导致粘结强度的提高。该地聚物砂浆可替代水泥砂浆用于旧混凝土结构的快速修复或腐蚀环境中混凝土的防护层。2020级硕士研究生郑楚继为该论文的第一作者，王俊教授为通讯作者。该项研究得到了国家自然科学基金（编号：52278261）、江苏省水利科技项目（202201）、江苏省科技资助建设项目（2021ZD05）和江苏省研究生实践创新计划（SJCX22 0461）的资助。
Development of a novel rapid repairing agent for concrete based on GFRP waste powder/GGBS geopolymer mortars
Chuji Zheng, Zhongyang Mao, Lei Chen, Hui Qian, Jun Wang
Abstract: The use of waste glass fiber-reinforced polymer (GFRP)powder as a binding agent in the synthesis of geopolymers offers an eco-friendly solution for managing GFRP waste.The aluminosilicate present in GFRP powder can be activated by an alkaline solution to produce a sustainable geopolymer.In this study,a novel rapid repairing material was developed from partially-replaced ground granulated blast furnace slag (GGBS)by GFRP waste powder as precursors in geopolymer mortar(GM).The effect of GFRP powder replacement and mix proportions on the fresh and hardened properties of GMs were evaluated.It was found that an increase in GFRP powder replacement led to an increase in the setting time and a decrease in workability.The highest 28-day compressive strength was obtained at a 20% replacement of GGBS with GFRP powder.At this optimal mixture,the GMs achieved a compressive strength of 15.2 MPa after 6 hours and 35.7 MPa after 1 day.Results from the slant shear test revealed that the failure pattern of the GM-repaired concrete samples changed from interface failure to monolithic failure and explosive spalling in the concrete substrate (CS),when the test duration increased from 3-days to 7-days and 28-days,respectively.This was attributed to the formation of a compact interfacial zone with prolonged testing duration,leading to increased bond strength.The developed GMs demonstrate a short setting time,excellent flowability,high early mechanical strength and superior bond properties,and thus can be applied as rapid concrete repair materials or as protective coatings for concrete in corrosive environments.
文章在线网址：https://doi.org/10.1016/j.jobe.2023.106542
该论文50天内免费下载网址https://www.sciencedirect.com/science/article/pii/S2352710223007210.
作者：郑楚继；审核：张涛、杨会峰
