不同弹性模量纤维混杂增强活性粉末混凝土的力学性能研究

Study on Mechanical Properties of Reactive Powder Concrete Reinforced with Fibers of Different Elasticity Modulus

为了提高活性粉末混凝土的韧性,通过掺杂不同弹性模量的纤维,制备了纤维增强混凝土。采用ASTMC1018韧性指数法,评价了增韧效果。结果表明:碳纤维能够在微观尺度上,减少混凝土中缺陷的数量,改善混凝土内部结构,增强、阻裂作用明显,基体强度较高。钢纤维在宏观尺度上,对于混凝土的阻裂作用明显,混凝土的延展性显著提高。混掺碳-钢纤维,虽然能提高基体的初裂强度,但是韧性却有所降低。

In order to improve the toughness of reactive powder concrete RPC,fiber reinforced concrete FRC was prepared by mix ing fibers with different elastic modulus.The toughening effect was evaluated by the toughness index method of ASTM C1018.The results show that carbon fibers can reduce the number of defects in concrete at micro-scale,improve the internal structure of concrete,prevent cracks obviously,and the matrix strength is higher.At the macro scale,steel fibers have obvious anti-cracking effect on concrete,and the ductility of concrete is significantly improved.Mixing carbon-steel fibers can improve the initial crack strength of the matrix,but the toughness of the matrix decreases.