Comparative study on Steel fibre reinforced Cum control concrete under flexural and deflection
Fibre reinforced concrete, a composition of concrete and fibres is being prominently used for various important applications. The hook tain steel fibres assist in controlling the propagation of micro-cracks present in the matrix, first by improving the overall cracking resistance the matrix and later by bridging across even smaller cracks formed after the application of load on to the member thereby preventing there widening into major cracks. In the present paper, the effect of steel fibre reinforcement with different percentage of fibre 0, 1%, 2% and 3% by volume for M-40 grade of concrete with aspect ratio 50, 60 and 67 are studied. The beam is tested for flexural strength. The percentage increase through utilization of steel fibers is reported. A relationship between aspect ratio vs. flexural strength represented graphically.
Comparative Study on Behaviour of Medium and High Strength Concrete Beam with and Without fiber Under Flexure
An experimental investigation of the behaviour of concrete beams reinforced with conventional steel bars and steel fibers and subjected to flexural loading is presented. An experimental program consisting of tests on steel fiber reinforced concrete (SFRC) beams with conventional reinforcement and reinforced concrete (RC) beams was conducted under flexural loading. SFRC beams include two types of beams containing steel fibers in two different volume fractions i.e. one percent and 1.5 percent. The cross sectional dimensions and span of beams were fixed same for all types of beams. The dimensions of the beams were 125mm x 150mm x11000mm.Tests on conventionally reinforced concrete beam beams showed enhanced properties compared to that of RC beams. The ultimate loads obtained in the experimental investigation were also compared with the theoretical loads for all types of beams specimens, containing steel fibers in different proportions, have been conducted to establish load –deflection curves. The various parameters, such as, first crack load service load ultimate load, of beams with and without steel fibres have been carried out and a quantitative comparison was made on significant stages of loading. Keywords; SFRC beams, RC beams, Steel fibres, Flexural loading.
The Mechanical Structures of Bamboos in Viewpoint of Functionally Gradient and Composite Materials
The structures of bamboos have been adapted to our natural environment over a long period of time. They are a composite material reinforced axially by fibers called bundle sheath. Furthermore, they have a hierarchical gradient structure, that is, a macroscopic gradient structure in culm (corresponding to trunk of wood) diameter, culm thickness and node length, and a microscopic one in the bundle sheath distribution. The macroscopic gradient structure leads to a constant surface stress at every height and the microscopic gradient structure provides a strength distribution in radial direction adapting to bending stress due to wind loads.