限制下钢纤维自应力混凝土的长期变形试验研究

钢纤维自应力混凝土是具有较高抗拉强度的高性能混凝土,其中稳定的自应力水平是保证混凝土高性能及构件安全性的关键所在,钢纤维自应力混凝土必须具有长期稳定的膨胀变形性能。该文从影响钢纤维自应力混凝土试件膨胀变形的因素入手,在不同钢纤维类型和纤维体积率、不同自应力等级、不同配筋率条件下,分别对3 a龄期与5 a龄期钢纤维自应力混凝土试件的膨胀变形性能进行试验研究。结果表明,钢纤维自应力混凝土试件的长期变形值基本维持在试件90 d左右的变形值,能够保证结构长期使用下的自应力稳定性。在结构设计时,可参照试件90 d左右的变形值进行设计。

Experimental Research on Long-term Expansive Deformation of Steel Fiber Reinforced Self-stressing Concrete under Restriction

The steel fiber reinforced self-stressing concrete is a sort of high performance concrete with high tensile strength.For this concrete,a stable self-stress level or long-term expansive deformation is a key to ensure the high performance and safety of concrete structures.A series of tests are carried out to measure the varied restrained expansive deformations of the steel fiber reinforced self-stressing concrete under combined restriction of steel fiber and steel bar with ages.The influencing factors of test...