摘要
双碳节约型经济大背景下,亟待开发面向复杂服役环境下基础设施修补用高性能修补防护砂浆。本文结合正交试验手段,综合探讨钢纤维(SF)掺量、乙烯-醋酸乙烯共聚物(EVA)乳胶粉掺量、高贝利特硫酸盐水泥和普通硅酸盐水泥比例对相应复配而成的纤维聚合物修补防护砂浆(SCPRM)的工作性能、力学性能、界面粘结性能和防水/抗渗耐久性能的影响规律。最优配比SCPRM的流动扩展度、凝结时间、抗折强度(f_(t))、抗压强度(f_(c))、14天粘结强度(f_(b)^(14d))、90天干燥收缩率、3天吸水率、接触角和氯离子渗透系数分别达226.0 mm、41 min/63 min(初凝/终凝时间)、5.2/17.1 MPa(f_(t)^(1d)/f_(t)^(28 d))、16.7/73.2 MPa(f_(c)^(1d)/f_(c)^(28 d))、3.61 MPa(f_(b)^(14 d))、16.44×10^(−5)、0.16%、70.04°和0.9486×10^(−12)m^(2)·s^(−1)。相应宏/微观结构显示SF分散均匀、EVA聚合物膜在水化产物中交替分布;FTIR揭示了复合胶凝体系水化特点与EVA对其水化影响机制。最终,制备出了一种综合性能优异,能够适应复杂服役环境的高性能修补防护砂浆。
Under background of carbon peaking and carbon neutrality economic savings,it is urgent to develop high performance repair protect mortar for infrastructure repairing and protecting in complex service environment.In this paper,the effects of steel fiber(SF)dosing,ethylene-vinyl acetate copolymer(EVA)emulsion powder dosing,and the proportion of high-belite sulfate cement and ordinary Portland cement on the workability,mechanical properties,interfacial bonding performance and waterproofing/impermeability durability of the fiber reinforced polymer repair protect mortar(SCPRM)were investigated by Taguchi orthogonal method.Results reveal that the flowability,setting time,flexural strength(f_(t)),compressive strength(f_(c)),bond strength at 14 days(f_(b)^(14d)),drying shrinkage at 90 days,water absorption after 3 days soaking,surface contact angle and chlorine ion permeability coefficient are 226.0 mm,41 min/63 min(initial/final setting time),5.2/17.1 MPa(f_(t)^(1d)/f_(t)^(28 d)),16.7/73.2 MPa(f_(c)^( 1d)/f_(c)^(28 d)),3.61 MPa(f_(b)^(14 d)),16.44×10^(−5),0.16%,70.04°,and 0.9486×10^(−12)m^(2)·s^(−1),respectively.The corresponding macroscopic/microscopic structures show that SFs are uniformly dispersed in the hydration products and the EVA polymer film was netlike distributed.FTIR reveals the hydration feature of compound cementitious system,and the corresponding influence mechanism of its hydration of EVA dosing.Finally,a high-performance repair protect mortar with excellent comprehensive performance and adaptability to complex service environment are successively prepared.
作者
高乙博
罗健林
李治庆
张纪刚
高嵩
朱夏彤
朱敏
张立卿
GAO Yibo;LUO Jianlin;LI Zhiqing;ZHANG Jigang;GAO Song;ZHU Xiatong;ZHU Min;ZHANG Liqing(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China;Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone,Qingdao 266033,China;The Fourth Construction Limited Center of China Construction Eighth Engineering Bureau,Qingdao 266413,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2023年第9期5258-5275,共18页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(51878364)
中建八局横向合作项目(JM20191030,QUT-2022-FW-0192,QUT-2022-FW-0028)
国家111计划与省高峰学科资助。
关键词
结构修补
高性能修补砂浆
正交试验优化
界面粘结性能
综合性能实现机制
structure repair protect
high performance repair protect mortar
orthogonal test optimization
interface bonding
comprehensive performance realization mechanism
