蒸养混凝土早期断裂性能研究 |
| |
引用本文: | 胡少伟,娄本星,尹阳阳,叶宇霄. 蒸养混凝土早期断裂性能研究[J]. 水利水运工程学报, 2020, 0(4): 88-95. DOI: 10.12170/20191226004 |
| |
作者姓名: | 胡少伟 娄本星 尹阳阳 叶宇霄 |
| |
作者单位: | 南京水利科学研究院,江苏南京210029;河海大学土木与交通学院,江苏南京210098 |
| |
基金项目: | 国家自然科学基金重点项目(51739008);国家重大科研仪器研制项目(51527811) |
| |
摘 要: | 为研究蒸养混凝土早期的断裂性能,开展了养护时间为4,8,16,24和48 h的混凝土三点弯曲梁断裂试验,分析了不同养护时间下蒸养混凝土的断裂性能和力学性能,进而给出了蒸养混凝土早期断裂参数与成熟度的关系。基于数字图像相关方法,测得了混凝土试件表面的全场位移及应变信息,研究了裂缝扩展的断裂演化过程。结果表明:在60 ℃蒸汽养护条件下,当养护时间在24 h内时,蒸养混凝土的力学性能随养护时间逐渐增大,养护时间超过24 h,蒸养混凝土的力学性能呈下降趋势;蒸养混凝土断裂性能在养护4~8 h内迅速提高,超过8 h后,混凝土断裂性能提升缓慢;其早期断裂韧度与成熟度具有较好的相关关系。
|
关 键 词: | 蒸养混凝土 断裂性能 成熟度 数字图像相关法 裂缝扩展 |
收稿时间: | 2019-12-26 |
Experimental study on early fracture properties of steam-cured concrete |
| |
Affiliation: | 1.Nanjing Hydraulic Research Institute, Nanjing 210029, China2.College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China |
| |
Abstract: | To study the early fracture properties of steam-cured concrete, three-point bending (TPB) specimens at different curing time (4 h, 8 h, 16 h, 24 h and 48 h) were tested, and the effects of the curing time on the mechanical and fracture properties of the steam-cured concrete were analyzed. Then, the relationship between fracture parameters and maturity was developed. Based on the digital image correlation (DIC) method, the full-field displacement and strain information of crack propagation were measured, and the damage evolution process of crack propagation was studied. The results indicate that the mechanical properties of steam-cured concrete increase with the curing time in 24 hours followed by a decrease tendency when the curing time is beyond 24 h. The fracture properties of steam-cured concrete increase significantly within 4~8 h of curing time and then rise slowly after 8 h. A good correlation between the fracture toughness and the maturity was observed to provide a basis for the fracture parameters of steam-cured concrete. |
| |
Keywords: | |
本文献已被 CNKI 万方数据 等数据库收录! |
| 点击此处可从《水利水运工程学报》浏览原始摘要信息 |
|
点击此处可从《水利水运工程学报》下载免费的PDF全文 |
|