装配式桥梁湿接缝混凝土变形及界面性能研究  

Study on Deformation and Interface Performance of Wet-joint Concrete of Prefabricated Bridge

作　　者：夏强 孙宇[1] 王冬[1,2,3,4] 唐修生 祝烨然[1,2,3,4] 徐志峰 XIA Qiang;SUN Yu;WANG Dong;TANG Xiu-sheng;ZHU Ye-ran;XU Zhi-feng(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Nanjing R&D High-Tech Co.,Ltd.,Nanjing 210024,China;Research Center on New Materials in Hydraulic Structure of Ministry of Water Resources,Nanjing 210024,China;Academician Workstation,Anhui Ruihe New Materials Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]南京瑞迪高新技术有限公司,江苏南京210024 [3]水利部水工新材料工程技术中心,江苏南京210024 [4]安徽瑞和新材料有限公司安徽省院士工作站,安徽马鞍山243000

出　　处：《混凝土与水泥制品》2020年第11期10-14,共5页China Concrete and Cement Products

基　　金：南京市交通科技项目(G312NJ-KTYJ7);中央级公益性科研院所基本科研业务费专项资金项目(Y420011)。

摘　　要：探讨了膨胀剂掺量、养护条件和界面状况对湿接缝混凝土的力学强度、变形特征、界面黏结强度及黏结抗渗性能的影响。试验结果表明:限制养护条件下微膨胀混凝土力学强度较同龄期自由养护试件均有提高,外部约束有利于提高其力学强度;养护条件对湿接缝混凝土的变形性能具有显著影响,工程应用中湿接缝混凝土应进行不少于14 d的湿养护;光面、粗糙面和界面剂处理三种接缝界面状态下,粗糙面试件的黏结劈裂抗拉强度和黏结抗渗性能最高,光面试件最低。涂刷界面剂后黏结劈裂抗拉强度略高于光面试件,但是黏结抗渗性能明显优于光面试件,渗透系数比光面试件降低了73.5%。The effects of the dosage of expansive agent,curing condition and interface situation on the mechanical strength,deformation characteristics,interface bonding strength as well as anti-permeability of wet joint concrete were studied.The results show that mechanical strength of micro-expansive concrete under restrained curing condition is higher than that of under free curing condition at the same ages,which indicates that restraint is beneficial to improvement of mechanical strength.The curing condition has a significant influence on deformation performance of wet-joint concrete and in practise wet-joint concrete should be wet cured for at least 14 d.Among three interface situations,the specimens with rough surface have highest bonding strength and resistance to penetrability while the specimens with smooth surface are the worst.The specimens that are brushed with interfacial agent have a little higher bonding strength but significantly better resistance to penetrability than the smooth specimens with a decrease of permeability coefficient by 73.5%.

关 键 词：湿接缝混凝土 强度 变形特性 界面性能 养护条件 

分 类 号：TU528[建筑科学—建筑技术科学]