Concrete Core Test
IS:516-P4-2018
1.1 scope
This Part of BS 1881 gives guidance on the tests that are available for nondestructive testing of hardened concrete which forms a laboratory specimen or part of a structure, structural component or other type of engineering construction. Some tests cause varying degrees of localized damage or defacement and may therefore be considered partially destructive; these methods are all defined as nondestructive. All the tests can be performed on the concrete as cast and do not require the removal of samples for subsequent analysis or testing. Methods of testing hardened concrete which require sample extraction are either dealt with in other Parts of BS 1881 or elsewhere (1, 2). NOTE 1. Damage caused by the extraction of small-diameter cores may not be significantly greater than that due to some of the nearto- surface methods included here, provided that reinforcement is not cut during extraction. In cases where strength determination is required they may offer similar or better accuracy with fewer calibration problems (3). NOTE 2. The titles of the publications referred to in this standard are listed on the inside back cover.
1.2 Definitions
For the purposes of this Part of BS 1881, the definitions
given in BS 2787 and BS 6100 : Part 6 apply, together
with the following.
1.2.1 non-dertructivr test. A test that does not impair tha
Intended performance of the element or member under
investigation.
1.2.2 location. A region of concrete that is being assessed
and that, for practical purposes, is assumed to be of unlform
q u a l i t y .
1.2.3 near-to-surface test. A test that measures some
property of the concrete near to, but below, the surface.
1.2.4 standard cube strength. The measured compressive
strength of a cube made, cured and tested in accordance
with BS 1881 : Parts 108,111 and 116 respectively.
1.2.5 estimated in situ cube strength. The strength of
concrete at a location in a structural member estimated by
indirect means and expressed as the compressive strength
of specimens of cubic shape.
1.4 Planning an investigation
1.4.1 Reasons for testing
The situations in which non-destructive testing may be
useful have been indicated in 1.3.4, and the reasons for
testing should be clearly established before the details of
a test programme are planned. These will establish the
information that is required, e.g. strength, uniformity and
density, and whether this should relate to the surface,
near to the surface, or to the body of a member.
1.4.2 Acceptance of test data
Before any programme commences, it is essential that there
is agreement between the interested parties on the validity
of the proposed testing procedures, the criteria for
acceptance and the appointment of a person and/or
laboratory to take responsibility for the testing and
interpretation of the results.
It is essential, despite the apparent simplicity of some test
methods, that testing is performed only by skilled
operators who are familiar with the methods and that the
interpretation of results is entrusted to a suitably
experienced engineer.
1.4.3 Selecting a test programme
1.4.3.1 Genera/. The test programme will be determined
by the objectives of the investigation coupled with the
suitability of the available methods in relation to the site
conditions and economic factors as outlined in 1.4.3.2
to 1.4.3.5.
The objective may be to investigate the overall quality of
the fabric, in which instance a random choice of test
locations will be appropriate. Where the objective is to
investigate suspect material, the test locations will be
selected for this purpose and the test results will only apply
to this suspect material. In both cases, a sufficient number
of test locations should be chosen to establish a satisfactory
confidence level for the results.
IF YOU HAVE ANY REQUIRMENT PLEASE CONATCT US