Experiment Research On Compressive Strength Of Steel Fiber Reinforced Specified Density Aggregate Concrete

The combined aggregate concrete is a type of transitional concrete which is developed from plain concrete and lightweight aggregate concrete. The lightweight aggregate are partly replaced by the crushed stone. The density of the combined concrete are between1950kg/m3-2200kg/m3and the strength of it are between40MPa-80MPa. Steel fiber reinforced Specified density aggregate concrete is better played its own advantages to meet the needs of different projects, such as the bridge structures, offshore oil platforms, water floats, docks, special civil nodes and other parts. The compressive strength is the main mechanical properties of steel fiber reinforced Specified density aggregate concrete. This paper research the influence of fiber parameters, the volume fraction of the fiber, and various lightweight aggregate dosages on the compressive strengths modulus of elasticity, Poisson ratio through75cube specimens (150mm*150mm*150mm) and150prismatic specimens (150mm*150mm*300mm).This paper presents a series of experiments to research the influencing factors on compressive strength of the steel fiber reinforced Specified density aggregate concrete. The main factors researched are the volume fraction of lightweight aggregate, type of steel fiber and volume fraction of the fiber. The experimental results are compared with the relevant test data in literature and the relationship between prismatic compressive strength and cubic compressive strength has been calculated; The proposed formula of modulus of elasticity of steel fiber reinforced Specified density aggregate concrete and the Specified density aggregate concrete, steel fiber, compressive strength were derived; Change characteristics of the combined aggregate of steel fiber reinforced concrete peak strain were observed.