夏 强1,2,3,4,孙 宇1,王 冬1,2,3,4,唐修生1,2,3,4,祝烨然1,2,3,4,徐志峰1,2,3,4
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%。
Abstract: 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%.
夏强,孙宇,王冬,等.装配式桥梁湿接缝混凝土变形及界面性能研究10-14.
XIA Q,SUN Y,WANG D,et al.Study on Deformation and Interface Performance of Wet-joint Concrete of Prefabricated Bridge[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):10-14.
装配式桥梁湿接缝混凝土变形及界面性能研究
夏 强1,2,3,4,孙 宇1,王 冬1,2,3,4,唐修生1,2,3,4,祝烨然1,2,3,4,徐志峰1,2,3,4
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%。
Abstract: 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%.
夏强,孙宇,王冬,等.装配式桥梁湿接缝混凝土变形及界面性能研究10-14.
XIA Q,SUN Y,WANG D,et al.Study on Deformation and Interface Performance of Wet-joint Concrete of Prefabricated Bridge[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):10-14.
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%。
Abstract: 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%.
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