SPLITTING TENSILE STRENGTH TEST OF CONCRETE (IS-516)

Objective:

This method involves the determination of the split tensile strength of cylindrical concrete specimens.


Reference:

IS: 516 – 1959, IS: 1199-1959, SP: 23-1982, IS: 10086-1982

Theory:

age in test , Tests will be carried out at a recognized age of test specimens, the most common being 7 and 28 days. Where it is necessary to achieve initial capacity, tests may be performed at 24 hours ± 1/2 hours and 72 hours ± 2 hours of age. The age will be calculated from the time of adding water to the dry material.

number of samples , At least three samples, preferably from different batches, will be made for testing at each selected age.

Device:

test machine , The test machine may be of any reliable type, shall be of sufficient capacity for the tests and shall be capable of applying the load at the rate specified in 5.5. The permissible error should not exceed ± 2 percent of the maximum load.

Cylinder ,The cylindrical mold shall be 150 mm in diameter and 300 mm in height conforming to IS: 10086-1982.

Weights and weighing equipment, apparatus and containers for miles
xing, tampering (square in cross section) etc.

Process:

  1. material sample ,

The aggregate samples for each batch of concrete shall be of the desired grading and shall be in air-dry condition. Upon arrival in the laboratory, the cement samples shall be thoroughly mixed either by hand or in a suitable mixer in such a manner as to ensure maximum blendability and uniformity in the material.

  1. proportioning ,

The proportions of the ingredients, including water, in the concrete mixes used to determine the suitability of the available materials, to be employed in the work, shall be equal in all respects.

  1. Weight ,

The amount of cement, each size of aggregate and water for each batch shall be determined by weight to an accuracy of 0.1 percent of the total weight of the batch.

  1. mixing concrete ,

Concrete should be mixed by hand, or preferably, in a laboratory batch mixer, in such a way as to avoid loss of water or other material. Each batch of concrete shall be such that after casting the desired number of test samples, about 10 per cent excess is left.

  1. mold ,

The cylindrical mold shall be 150 mm in diameter and 300 mm in height conforming to IS: 10086-1982.

  1. to compress ,

The test samples shall be made as soon as possible after mixing, and in such a way as to produce complete compaction of the concrete with neither separation nor excessive delay.

  1. Treatment ,

Test specimens shall be stored in moist air of at least 90% relative humidity, in a place free from vibration and at a temperature of 27° ± 2°C for 24 hours ± 1/2 hour from the time of watering. dry ingredients.

  1. placing the sample in the test machine ,

The bearing surfaces of the supporting and loading rollers shall be cleaned, and any loose sand or other material shall be removed from the specimen surfaces where they are to make contact with the rollers.

SPLITTING TENSILE STRENGTH TEST OF CONCRETE (IS-516) 1

  1. Two bearing strips of plywood nominally (1/8 inch i.e. 3.175 mm) thick, free of imperfections, approximately (25 mm) wide, and a length equal to or slightly longer than the sample, should be provided for each specimen.
  2. Bearing strips are placed between the upper and lower bearing blocks of the specimen and the testing machine, or between the specimen and supplementary bars or plates.
  3. Draw diameter lines at each end of the sample using a suitable tool that will ensure that they are in the same axial plane. Center one of the plywood strips with the center of the lower bearing block.
  4. Place the sample on the plywood strip and align so that the marked lines at the ends of the sample are perpendicular and canter over the plywood strip.
  5. Place the second plywood strip lengthwise on the cylinder, cantered on the marked lines at the ends of the cylinder. Apply loads continuously and without shock at a constant rate within the range of tensile stress splitting 689 to 1380 kPa/min until the failure of the specimen
  6. Record the maximum applied load indicated by the test machine at failure. Note the type of failure and presence of fracture.

Observation:

concrete mix ratio For 1 m3 of concrete for one batch of concrete
Coarse Aggregates (kg)
Fine Aggregates (kg)
Cement (kg)
water (kg)
s/a
W/C Ratio
mix
serial number sample age identification mark Diameter of Specimen (mm) Depth (mm) Max Load (N) Tensile Strength (Mpa) Average Tensile Strength (Mpa)
1 7 Days
2
3
4 28 days
5
6

calculation:

Calculate the splitting tensile strength of the sample as follows:


t = 2p/πld

Where

Tea = splitting tensile strength


P = max applied load

Took = length, m

D = diameter

Conclusion:

record the following

  1. i) The average tensile strength of concrete sample for 7 days is found to be ………..
  2. ii) The average tensile strength of concrete sample for 28 days is found to be ………..

Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at ProCivilEngineer.com Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.