Testing Research On Mechanical Properties Of Fiber Reinforced Slag Concrete

Fiber reinforced concrete is a kind of new composite material. As compared with normal concrete, tensile strength, flexural strength, wear resistance, impact resistance, fatigue-resistant, toughness, crack-resistant and antiknock properties are all improved. It is widely used in various fields. As a kind of green building material, slag powder has the features of popular price and large amounts. Equivalent to replace cement within fiber reinforced concrete, we can make full use of resources, and reduce fiber reinforced concrete cost and conformance to requirements of the opinion of sustained development.In this paper, cement witch in normal concrete and fiber reinforced concrete, replaced by slag powder in equal quantity, makes up slag concrete and fiber reinforced slag concrete. Meanwhile, mechanical properties of concrete are studied here. The primary coverage as follows:(1) Retrospective analysis has been done on research situation and project application of fiber reinforced concrete at home and abroad in recent years. Analysising the reinforced and crack-resistanced mechanism of fiber reinforced concrete. Summary the current status of development and application of slag powder in cement and concrete in recent years.(2) The compressive strength, splitting strength, breaking strength, elastic modulus , the relationship curves between splitting load and lateral deformation, and the relationship curves between bending load and deflection of slag concrete and fiber reinforced slag concrete have been tested through experiments. Investigated the effect of fiber content, slag powder content and concrete grade on the above mechanical properties. Established the calculation model for the compressive strength changing by ages. Statisticsed of the conversion factor of compressive strength and splitting strength between standard specimen and non-standard specimen. The results showed that: the index of mechanical properties of normal concrete and fiber reinforced concrete improved after added slag powder; Steel fiber is very efficacious for increasing strength and toughness of concrete; Meanwhile, polypropylene fibre also has effect on increasing strength and toughness, but show worse effect than steel fiber. All the above features can be seen from the relationship curves between splitting strength and lateral deformation, and the relationship curves between bending load and deflection.(3) The compression fracture morphology of slag concrete specimens show distinctly inverted cone accompanied by a strong voice breaking split in half observed through the experiment,while the fracture morphology of fiber reinforced slag concrete specimens show only peeling and dropped residue.And keep an integral whole after added steel fiber for splitting damage specimens, and accompanied by the noise of fiber extracted and broked.