| 蒸养混凝土早期断裂性能研究 |
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| 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. |
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| 作者姓名： | 胡少伟 娄本星 尹阳阳 叶宇霄 |
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| 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 |
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| 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） |
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| 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。
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| 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 |
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| Affiliation: | 1.Nanjing Hydraulic Research Institute, Nanjing 210029, China2.College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China |
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| 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. |
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