Hybrid Fibers Reinforced Concrete And The Effects Of The Alumina Bubble On Its Performances

The different types of fibers with the low elasticity module and the high elasticity module have the respective characteristics. To improve the performances of concrete, hybrid fibers are added into the concrete, and make full use of each kind of fiber's characteristic. The fiber reinforced concrete performs well in the impermeability, toughness, resistance of crack and other performances. The hybrid fibers reinforced concrete is one kind of new engineering composite materials, which contains the performances which the single fiber reinforced concrete doesn't contain.In this paper, the fiber reinforced concrete's performances and the domestic and foreign research current situation are introduced. Hybrid fibers reinforced concrete is prepared by adding the hybrid fibers into the concrete,which are composed of the metal fiber and the polypropylene fiber. Alumina bubble is adding into the fiber reinforced concrete to improve the fluidity of concrete. The fluidity of hybrid fibers reinforced concrete is tested by the method of spreading degree method, L-shape flow testing method, sink degree method and U-shape testing method. The bending strength and the compressive strength of hybrid fibers reinforced concrete are tested, and fiber distributing situation of the hybrid fibers reinforced concrete is tested by the scanning electronic microscope.Firstly, in this paper, how the content of the hybrid fibers, the proportion of the hybrid fibers and the length of the hybrid fibers influence the fluidity of the hybrid fibers reinforced concrete is appraised by the analysis method of orthogonal trial; Secondly, the factors influencing the fluidity and the mechanical properties of hybrid fibers reinforced concrete are studied gradually by the comparative trial. The result shows that: as the content of the hybrid fibers increases, the fluidity of hybrid fibers reinforced concrete approximately declines linearly, and the bending strength and the compressive strength of the hybrid fibers reinforced concrete increase firstly and then decline. As the proportion of the hybrid fibers changes(the content of the polypropylene fiber reduces and the content of the metal fiber increases),the fluidity of the hybrid fibers reinforced concrete approximately increases linearly, and the bending strength and the compressive strength of the hybrid fibers reinforced concrete increase firstly and then decline. As the length of the hybrid fibers increases, the fluidity of the hybrid fibers reinforced concrete approximately declines linearly, and the bending strength and the compressive strength of the hybrid fibers reinforced concrete increase firstly and then decline. As the added content of the alumina bubble increases, the fluidity of the hybrid fibers reinforced concrete approximately increases linearly, and the bending strength of the hybrid fibers reinforced concrete increases firstly, then changes slowly, and the compressive strength of the hybrid fibers reinforced concret increases firstly, then declines. The experiment shows that the content of the hybrid fibers is 1.6% superiorly, the proportion of the hybrid fibers is 1:1 superiorly, the length of the hybrid fibers is 8mm superiorly and the added content of the alumina bubble is 6% superiorly.