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蒸养混凝土早期断裂性能研究
胡少伟1, 娄本星1, 尹阳阳2, 叶宇霄1
1.南京水利科学研究院 材料结构研究所;2.河海大学
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4h、8h、16h、24h及48h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24h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24h,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时间4-8h内迅速上升,超过8h后,混凝土断裂性能上升缓慢;其早期断裂韧度与成熟度具有较好的相关关系,可以为蒸养混凝土早期断裂参数提供依据。
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
DOI:
分类号:TV313? TU375.1??
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)
Experimental study on early fracture properties of Steam-cured concrete
hushaowei1, loubenxing1, yinyangyang2, yeyuxiao1
1.Nanjing Hydraulic Research Institute;2.College of Civil and Transportation Engineering,Hohai university
Abstract:
To study the early fracture properties of steam-cured concrete, three-point bending (TPB) specimens at different curing time (4h, 8h, 16h, 24h and 48h) 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 beyond 24 h. The fracture properties of steam-cured concrete increase significantly within 4-8 h of curing time and then rise slowly after 8h. A good correlation between the fracture toughness and the maturity was observed, which can provide a basis for the fracture parameters of steam-cured concrete.
Key words:  steam-cured concrete  fracture property  maturity  DIC  crack propagation
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