摘要
为了研究采用国产聚乙烯醇纤维和普通河砂制备的高延性水泥基复合材料（HDCC）作为修补材料的性能,制备了3组不同强度等级的HDCC,通过试验研究了HDCC的力学性能、弯曲韧性、单轴拉伸性能、干燥收缩性能、相对渗透性系数和黏结抗拉性能。结果表明：纤维体积掺量2%的HDCC弯曲韧性比较高,极限拉伸应变大于1.75%,应变硬化和多缝开裂特征显著;HDCC在14 d龄期前收缩应变快速发展,在28 d龄期收缩应变基本趋于稳定;HDCC相对渗透性系数随着龄期的增加而减小;HDCC与基底之间黏结抗拉强度在3.0～4.1 MPa之间,修补试件的黏结抗拉强度随着HDCC强度的增大而增大。
In order to investigate properties of high ductility cementitious composites （HDCC） for repair, which is made with domestic polyvinyl alcohol （PVA） fiber and normal river sand, three series HDCC with different strength grades were prepared. Experiments were carried out to study HDCC properties, such as mechanical properties, bending toughness, uniaxial tensile properties, drying shrinkage, relative permeability coefficient and adhesive tensile strength. Test results show that HDCCs with 2% （volumetric ratio） of PVA fibers have excellent bending toughness, ultimate tensile strain greater than 1.75 % and obvious strain hardening and multi-cracking. HDCCs＇ drying shrinkage develops rapidly during the first 14 days and tends to be stable after 28 days. Relative permeability coefficient of HDCC decreases as the age increases. Adhesive tensile strength between HDCC and substrate ranges from 3.0 to 4.1 MPa, and increases with HDCC compressive strength.
作者
郭丽萍
陈波
孙伟
张文潇
GUO Liping;CHEN Bo;SUN Wei;ZHANG Wenxiao(School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2018年第7期169-174,共6页
Journal of Building Structures
基金
国家重点研发计划课题(2016YFC0401610)
国家自然科学基金项目(51778133,51438003,51739008)
关键词
高延性水泥基复合材料
修补
弯曲韧性
单轴拉伸
干燥收缩
抗渗
黏结抗拉强度
high ductility cementitious composites
repair
bending toughness
uniaxial tension
drying shrinkage
permeability
adhesive tensile strength
