摘要
针对高强钢纤维混凝土流动性差,不易用于现场浇筑的缺点,从搅拌方法、骨料粒径以及砂率三方面进行试验研究;结果表明,采用钢纤维分两次加入并适当延长搅拌时间有利于其流动性及强度的保证;随着骨料粒径的降低,钢纤维混凝土强度有所降低,但流动性得到较大幅度的提高,明显减弱了骨料与钢纤维形成的"棚架"效应,表现出更好的延性;随着砂率的提高,高强钢纤维混凝土流动性有较大的提高,但强度、延性均有所下降;对于高砂率、高流动性的钢纤维混凝土拌合物成型时需适当减少振动时间。
High strength steel fiber reinforced concrete is due to the low fluidity, difficult to be widely employed in the construction site. Mix method, aggregate size and sand ratio were investigated to resolve this problem.The test results show that divide the steel fibers into two parts and extend the mixing time can improve the fluidity of high strength steel fiber reinforced concrete. The strength of high strength steel fiber reinforced concrete is weakened with decrease of aggregate size, and the rack - type effect significantly reduced, the fluidity improved substantially as well as the enhance of ductility. The result show that along with the raising of sand ratio, the fluidity of high strength steel fiber reinforced concrete increased visibly, the ductility and strength decreased. It is concluded that a reasonable time should be adopted when vibrating to shape the fresh steel fiber reinforced concrete with high sand ratio and high fluidity.
出处
《混凝土》
CAS
北大核心
2016年第1期156-160,共5页
Concrete
基金
国家自然科学基金项目(51308052)
关键词
高流动性
高强钢纤维混凝土
搅拌方法
砂率
high fluidity
high strength steel fiber reinforce concrete
mix method
sand ratio
