冻融循环作用下的钢纤维混凝土性能研究
Study on Properties of Steel Fiber Reinforced Concrete Under Freeze-thaw Cycle
范永康1
作者信息
- 1. 武汉投控检验检测有限公司,湖北 武汉 430000
- 折叠
摘要
为了研究钢纤维对混凝土抗冻性能影响,在混凝土中添加不同掺量的钢纤维,测定混凝土拌合物的性能以及28d标准养护后的力学性能,同时采用快冻法对成型后的钢纤维混凝土进行冻融试验,分析冻融循环次数对钢纤维混凝土质量损失和相对动弹性模量变化的影响,通过测定冻融后试件的抗折强度,计算其抗折强度保留率来评价其抗冻性能.研究表明:在混凝土中掺入适量的钢纤维能够有效阻止混凝土内部微裂缝的产生与发展,提高混凝土的力学性能及抗冻性能.当钢纤维掺量为 60 kg/m3 时,混凝土拌合物性能良好,抗折强度、抗冻性能及冻后抗折强度保留率显著提高.
Abstract
In order to study the influence of steel fiber on the frost resistance of concrete,different fractions of steel fiber were added to concrete to measure the performance of concrete mix and the mechanical properties after 28 days standard curing.Meanwhile,freeze-thaw tests were carried out on the steel fiber concrete after forming by using the fast freezing method and the influences of the number of freeze-thaw cycles on the mass loss and relative dynamic elastic modulus changes of steel fiber concrete were analyzed.The flexural strength of frozen specimens was measured,and the flexural strength retention rate was calculated to evaluate its frost resistance.The research shows that adding appropriate steel fiber into concrete can effectively prevent the occurrence and development of micro-cracks in concrete,and improve the mechanical properties and frost resistance of concrete.When the steel fiber content is 60 kg/m3,the performance of concrete mixture is good,the bending strength,frost resistance and the retention rate of bending strength after freezing are significantly improved.
关键词
钢纤维/混凝土/抗冻性能/冻融循环Key words
steel fiber/concrete/frost resistance/freeze-thaw cycle引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据