• 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. Young Modulus of Copper

    0.4 0.45 0.5 0.55 0.6 0.0035 0.004 0.004 0.005 0.0055 0.0035 0.004 0.0045 0.005 N/A 0.0035 0.004 0.00425 0.005 0.0055 From the graph above , Slope of the line , S = 121.46 kgm-1 Young modulus of the copper wire , Y = S = X 121.46 = 4.48 X

  2. Investigation to determine the viscosity of glycerol.

    This prevents accurate determination of the point at which a body reaches terminal velocity. The importance of knowing the point at which a sphere reaches terminal velocity is because at this point the forces acting on the sphere are balanced.

  1. Quality of Measurement - Physics AS

    accuracy of "g" by freefall, as well as giving me an idea of what to expect for my results and help me in deciding what apparatus to use. Apparatus: * Stopwatch * Ticker Timer * Ruler * Clamp * Boss * Retort Stand As it's a very simple experiment the

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

    If you coiled a wire with a current around a Soft-Iron Core, you would be able to re-align some of the domains. This would inflict magnetism and consequently a magnetic field. When you switch off the current, the domains will return back to a random set up.

  1. A Comparison of Methods for History Matching.

    Using this process, reservoir heterogeneity capturing is attempted; this is done by matching fractional flow curve through manipulation of permeability field. The second step involves mapping the modification performed to the streamline permeability on to the grid blocks. Flow simulations are performed to check match, in which iterations are involved if desired match is not achieved.

  2. Maths Coursework – Artic Research

    will mirror the one going north. Base camp ? 200 km h-1 Resultant velocity Observation site 50 km h-1 ? = Sine-1 (1/4) ? = 11.25? Bearing = 360? - 11.25? Bearing = 348.75? Speed of aircraft = resultant velocity 2002 = V2 + 502 2002 - 502 = v2 37500 = v2 v = ?37500 Resultant speed of aircraft = 193.6km h-1 (3s.f)

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