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

Equivalent cube test

Extracts from this document...

Introduction

Equivalent cube test Objectives: Determine equivalent cube compressive strength of the concrete. Acquire an appreciation of the relation between equivalent cube compressive strength and other strengths such as cube compression strength, flexural tensile strength and splitting tensile strength. Test to be conducted: Determine compressive strength using equivalent cube method on a part of the beam broken in flexural tensile strength test in accordance with BS1881: Part 119: 1983. Specimen: Broken portion of beam from flexural strength test. Apparatus: Equivalent cube strength test jig, compressive testing machine. Procedures: a. The broken portions of the beams selected for the compressive strength test shall be have a length not less than 50mm greater than the width of the beam, be free from cracks, chipped surfaces or other obvious defects within the length to be tested. ...read more.

Middle

e. Apply the load without shock and increased continuously at a rate of approx 15 MN/m2 per minute until no greater load can be sustained. Record the maximum load. Calculations: Fig. 3.3.1 Typical device for "equivalent cube" test. Data: Area to be test: 150mm X 150mm The maximum load: KN Result: stress = N/mm Discussion: From the above results, we can see that the reading in test 1 and 4 (cube compressive strength test and equivalent cube test) has a small different. The reading in equivalent cube test was a little bit higher than that of cube compressive strength test. It can be explained by energy is needed to break the bonding between the forced concrete and the around concrete. ...read more.

Conclusion

As a result, equivalent cube test is a good method to exam the compressive strength of the specimen. Comparing the compressive strength to the tensile strength of concrete, the tensile strength is only 1/10 of its compressive strength. This reflects the fact that concrete is strong in compression but weak in tension. Rate of loading is quite important to the test compressive strength. In general, the higher the loading rate the higher the measured strength. It is thought that under slow loading rates more sub critical cracking may occur or that slow loading allows more creep to occur which increase the amount of strain at a given load. Conclusion: The compressive strength of the specimen is kN/mm2. It's about 10 times the tensile strength. And it is a little bit higher than the result obtained from the cube compressive strength test. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Inorganic Chemistry 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 Inorganic Chemistry essays

  1. effects Concentration and Temperature on the Rate of Reaction

    although I first need to rearrange the equation to make 'k' the subject: Reaction Rate = k[BrO3][Br -][H+]2 k = Reaction Rate [BrO3][Br -][H+]2 k = 0.0221 (0.008)(0.01)(0.01) k = 0.0221 (8 x 10-7) k = 27625 The units for 'k' vary depending on the reaction investigated.

  2. an experiement to test for anions and cations

    An equal amount of dilute nitric acid was then added to the test tube, along with 3 drops of silver nitrate solution. 7. No precipitate was formed and the solution was again discarded with lots of water down the sink.

  1. Chemistry - Data Analysis

    Finally, to make the experiment better I could have used a computerised thermometer which takes the readings automatically. This would make the experiment better and more accurate as all of the readings would have been taken on the minute, every minute where as in my experiment some of the readings,

  2. Cube compressive strength test

    Pacerate for 150mm cubes is 338kN / min. Load rate is 0.2 - 0.4 mPa / s. 9. The top platen was lowered on to the cube and a uniform seating was ensured by gently rotating the top platen as it is brought to bear on the cube.

  1. The Effects of Strong and Weak Acids on the Order of a Reaction.

    Activation energy number becoming positive sure to the negative signs in the equation. Working out the Rate of a Reaction The rate of a reaction can be determined by doing the 'Rate Equation'. This is an equation which has gained by doing experiments and finding out the ratios between the concentrations of the substances.

  2. Flame Test Experiment

    For example Ca is red. Overall the experiment had given me relevant results which I then was able to see if they were correct, the experiment is quick, easy and cheap. During the experiment my aim was achieved which was to try and identify the unknown substances present in the sample.

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