• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Flexural strength measurement of a concrete beam.

Extracts from this document...

Introduction

Flexural strength test

Introduction:

It is to measure the flexural tensile strength of the concrete. It is a measure of unreinforced concrete beam or slab to resist failure or bending. Acquire an appreciation of the relation between flexural tensile strength and other strengths such as cube compression strength, splitting tensile strength and equivalent cube compressive strength.

Apparatus:

  • Compressive testing machine( Fig. 1)
  • Flexural loading device( Fig. 1)
  • Caliper and
  • Straight edge

image00.jpg

Fig.1 control panel of testing machine and flexural loading device

Procedures:

  1. The beam was brought up from the curing tank.
  2. The surface water and grit were wiped out with a damp cloth.
  3. The beam was visually inspected for faults and damages.
  4. Length and cross-sectional dimensions were measured accurately with a caliper.
  5.  Test device was wiped with a dry cloth.
...read more.

Middle

The load was applied without shock and continuously increased until the beam broke.The maximum applied force was recorded.

Remarks:

  • The rollers should be placed at right angles to the longitudinal axis of the specimens.
  • Vertical lines should be drawn on one of the side of the beam to ensure that the beam can be correctly centred in the machine with the trowelled surface vertical.
  • If the cracking position is outside the middle one-third distance between the supporting rollers, ASTM C 78-84 should be used instead of BS 1881: Part 118: 1983.

Data and results:

Specimen

150.25mm X 149.98mm X 749mm

image01.jpg

Dimensions of the concrete beam and setup for flexural strength test

The fracture occurred inside the middle one-third so the test was regarded as valid and can apply the formula suggested by BS 1881: Part 118: 1983.

...read more.

Conclusion

The beam are tested on their side In relation to the as-cast position at a rate of increase in stress in the bottom fibre of between 0.02 and 0.10 N/mm2, the lower rate being for low strength concrete and the higher rate for high strength concrete.

Conclusion:

The purpose of flexural strength test is to determine the tensile strength of the tested concrete beam. The higher the value, the higher tensile force the beam can support. The value of the tensile strength of the tested beam is much lower to the compressive strength of the beam. It shows that the concrete beam is weak at tension compared to its relative ability to resist compression

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Fields & Forces essays

  1. Investigation to determine the viscosity of glycerol.

    Temperature readings will be on the x-axis of my viscosity - temperature graph. * Glycerol - is the liquid used. I will calculate the density of glycerol at different temperature levels. This will be on the y- axis of my viscosity - temperature graph.

  2. Young Modulus of Copper

    With the micrometer screw gauge , take several readings of the diameter d of the wire , taking two readings at right angles at several points along the wire . 3. Increase the load m by successive additions of 0.05 kg and read the extension e1 after each addition. 4.

  1. To see how the number of coils on an electromagnet affect its strength.

    I keep on doing 5 turns on the coils to test its strength. The more turns I did, the stronger it got. You can find out this from my table of results and my graph. From the graphs it is easy to see that my graph is steeper than the other groups graph.

  2. Quality of Measurement - Physics AS

    I also predict that the graph should show a trend in the distance fallen +/- 0.1cm to 1/2t� due to the gradient remaining a constant. My predicted graph for my result Prior to my main experiment I did a preliminary experiment to see how many final test proved in the

  1. What Affects the Strength of Magnetism Exerted By an Electromagnet?

    A South Pole will form nearest to the Magnet. The opposite side will therefore be a North Pole. Now the metal has become magnetized, lines of flux exeunt from the North Pole of the metal and are attracted to the South Pole of the 'Parent Magnet'.

  2. A Comparison of Methods for History Matching.

    Another fact about permeability which it recognises is that it is inversely proportional to the time-of-flight. Changes to permeability to match water-cut data are done by assigning a multiplying factor '?' (SPE 66388). To account for the errors associated with assigning multiplying factors, the AHM technique can alter permeability/porosity transform,

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work