Experimental Research On The Fundamental Mechanical Behavior Of Steel Fiber Reinforced Lightweight Aggregate Concrete

Reducing self-weight and improving toughness is always a subject that modifying the common concrete since it is come into being , the steel fiber reinforced concrete pathed the way for improving the toughness of it ,while the lightweight concrete solved the problem to the heavy dead weight. This subject is to combine the steel fiber reinforced concrete with the lightweight aggregate concrete to form a steel fiber reinforced lightweight aggregate ( haydite ) concrete, which owns the advantages of high toughness of steel fiber reinforced concrete and the light weight of lightweight aggregate concrete. In order to get the main character and mechanical property parameter of strength and deformation of steel fiber reinforced lightweight aggregate concrete, we do the experiments of cubic compressive strength, splitting-tensile strength, bending strength, elastic modulus and axial compressive strength and summarize the influence laws to the relation of mechanical performance of steel fiber reinforced lightweight aggregate and the quantity of steel fiber.The experimental results are summarized as follows: the tensile strengh and bending strengh of steel fiber reinforced lightweight aggregate concrete can be improved significantly by the addition of steel fiber; to some extent ,the addition of steel fiber can also increase the compressive strength ,although little , it radically improves the compressive toughness , and the steel fiber reinforced lightweight aggregate concrete will not fall apart with cracks; with the increase of the volume fraction of steel fiber, the elastic modulus is also rising somewhat; Poisson's ratio is influenced little with the addition of the steel fiber and the effect regularity displays unconspicuously.Finally,some effective methods of improving working performance of the steel fiber reinforced lightweight aggregate concrete structure are discussed and several suggestions are put forward for further research.The experimental results can provide useful information for studying on the steel fiber reinforced lightweight aggregate concrete and applying it in the future.