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Sampling and Testing

The contractor shall take concrete samples for testing according to the engineer's instructions regarding number, frequency, and location. Cube tests shall be conducted at a rate of 1 set per 10 cubic meters of concrete, with samples taken randomly throughout the day, including at least one sample for each grade used daily. Sampling and cube testing shall follow the procedures described in BS 1881. For cubes tested at 28 days, the average strength of any 4 cubes must exceed the specified strength by at least 0.5 times the margin, and each individual result must be greater than 85% of the specified strength. If these requirements are not met, the relevant batches may be deemed non-compliant. The contractor must submit a remediation plan for

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52 views1 page

Sampling and Testing

The contractor shall take concrete samples for testing according to the engineer's instructions regarding number, frequency, and location. Cube tests shall be conducted at a rate of 1 set per 10 cubic meters of concrete, with samples taken randomly throughout the day, including at least one sample for each grade used daily. Sampling and cube testing shall follow the procedures described in BS 1881. For cubes tested at 28 days, the average strength of any 4 cubes must exceed the specified strength by at least 0.5 times the margin, and each individual result must be greater than 85% of the specified strength. If these requirements are not met, the relevant batches may be deemed non-compliant. The contractor must submit a remediation plan for

Uploaded by

SABEASN
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Sampling and Testing

The Contractor shall take samples of the concrete for testing. The number frequency and location shall be
decided by the Engineer.

Unless otherwise requested by the Engineer, cube tests shall be made at the rate of 1 set of cubes per 10m3of
concrete. The times of day at which samples are taken shall be chosen at random. At least one sample shall
be taken on each day that a particular grade is used.

The procedure for sampling and making cubes and testing shall be carried out strictly in the manner described
in BS 1881.In addition, the Engineer may order at his own discretion, additional samples of concrete to be
cured at the job site, in order to verify actual strengths obtained.

For cubes tested at an age of 28 days the cube strength shall conform to the following requirements:

(a) The average strength determined from any group of four consecutive test cubes shall exceed the
specified characteristic strength by at least 0.5 times the current margin

(b) Each individual test result shall be greater than 85% of the specified characteristic strength.

If the average strength of any group of four consecutive test cubes fails to meet the first requirement (a) then
all concrete mixed in all batches from the first batch to the last batch from which samples were taken to make
the test cubes, together with all the intervening batches shall be deemed not to comply with the strength
requirements.

If only one cube fails to meet the second requirement (b) then that result may be considered to represent only
the particular batch of concrete from which that cube was taken.

The Contractor shall take such remedial action as the Engineer may order, including the removal of the
relevant concrete, and shall, before proceeding with the concreting, submit for the Engineer's approval details
of the action proposed to ensure that the concrete complies with the requirements of the Specification.

Acceptance criteria shall be that the average 28 days compressive strength of 3 cubes exceeds the
characteristic strength of the concrete and that the difference between the greatest an least strength is not
more than 20 percent of the average.

The 7 days test results shall generally be made use of as an indicator of the strength at 28 days and unless
otherwise decided by the Engineer, no decision regarding non acceptance of the concrete shall be made using
these results.

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