摘要
通过对压力为0，0．10，0．25，0．50，0．75倍设计强度下混凝土抗冻性的比较，分析压应力对混凝土抗冻性能的影响．结果表明：当混凝土压应力比控制在0．10～0．50时，随着压应力增加混凝土冻融循环寿命提高；当压应力比提高到0．50～0．75时，随着压应力增加混凝土冻融循环寿命降低；在临近损坏时，压应力越高，相对动弹性模量下降越快，其冻融破坏的突发性愈强；混凝土表面的剥落损伤与预应力大小无明显关系，但与冻融次数关系较大．建立了不同预压应力下混凝土抗冻预测模型，通过计算对比，证明该模型具有一定的工程价值．
Through comparison analysis of frost-resistant property of concrete under 0, 0. 10, 0. 25, 0. 50, 0.75 times design strength pressure stress states, the relation between pressure stress and frost-resistant property of concrete was found. It was concluded that the concrete freeze-thaw cycle life will increase with the increase of con crete pressure stress when the concrete pressure stress ratio is 0. 10 - 0. 50, but when the stress ratio increases to 0. 50 - 0. 75, the concrete freeze-thaw cycle life will deduce with the increase of concrete pressure stress. Approac- hing the damage, the higher the stress, the relative dynamic elastic modulus decreased faster, the freeze-thaw damage is in shorter time. Meanwhile it was found that the concrete surface spalling damage has no obvious rela- tionship with pre-stressed capacity, but is relative to freeze-thaw cycle times. The concrete frost-resistant forecast model was established at the different pressure stress states finally. Through calculating and contrast, it is known that the model is useful for engineering.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2013年第6期1058-1062,共5页
Journal of Building Materials
基金
国家自然科学基金资助项目(51178470)
湖南省教育厅科研资助项目(12C0635
13B016)
关键词
受压混凝土
冻融
耐久性
动弹性模量
prestressed concrete
freeze-thaw
durability
dynamic elastic modulus
