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BRITISH STANDARD
Structural use of
concrete —
Part 1: Code of practice for design and
construction
ICS 91.080.40
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
BS 8110-1:1997
Incorporating
Amendments Nos. 1, 2,
3 and 4
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BS 8110-1:1997
Committees responsible for this
British Standard
The preparation of this British Standard was entrusted by Technical
Committee B/525, Building and civil engineering structures, to Subcommittee
B/525/2, Structural use of concrete, upon which the following bodies were
represented:
Association of Consulting Engineers
British Cement Association
British Precast Concrete Federation Ltd.
Concrete Society
Department of the Environment (Building Research Establishment)
Department of the Environment (Property and Buildings Directorate)
Department of Transport (Highways Agency)
Federation of Civil Engineering Contractors
Institution of Civil Engineers
Institution of Structural Engineers
Steel Reinforcement Commission
This British Standard, having
been prepared under the
direction of the Sector Board
for Building and Civil
Engineering, was published
under the authority of the
Standards Board and comes into
effect on 15 March 1997
© BSI 2007
Amendments issued since publication
First published August 1985
Second edition March 1997
Amd. No.
Date
9882
September 1998
13468
27 May 2002
16016
30 November 2005
Indicated by a sideline
17307
31 August 2007
See national foreword
The following BSI references
relate to the work on this
standard:
Committee reference B/525/2
Draft for comment 95/105430 DC
ISBN 978 0 580 59893 7
Comments
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This part of BS 8110 has been prepared by Subcommittee B/525/2. It is a
revision of BS 8110-1:1985 which is withdrawn.
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The start and finish of text introduced by Amendment No. 4 is indicated in the
text by tags '(.
Compliance with a British Standard cannot confer immunity from
legal obligations.
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When specifying concrete in accordance with BS 8500-1 and BS 8500-2 characteristic strength is expressed
as a dual classification comprising the characteristic strength of cylinder test specimens followed by the
characteristic strength of cube test specimens, e.g. C28/35 'Text deleted(.
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(see 'A.4.2 of BS 8500-1:2006();
(see 'A.7.4 of BS 8500-1:2006();
(see 'A.8.1 of BS 8500-1:2006();
(see 'A.7.3 of BS 8500-1:2006();
'A.7.1 of BS 8500-1:2006();
(see 'A.4.3 and Table A.8 of BS 8500-1:2006();
(see 'A.4.4 of BS 8500-1:2006();
'A.7.1 of BS 8500-1:2006();
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(see 'A.4 of BS 8500-1:2006();
(see 'A.7 of BS 8500-1:2006();
f) the cement content and water/cement ratio of the concrete (see 3.3.5 of this standard and 'A.4 of
BS 8500-1:2006();
(see 'Table A.8 of BS 8500-1:2006();
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'Table A.3, Table A.4 and Table A.9 of BS 8500-1:2006( give the limiting values of the nominal cover of
'Table A.8, Table A.11 and Table A.12 of BS 8500-1:2006( give recommended values for the maximum
free water cement/ratio, minimum cement content and minimum strength class of concrete to ensure long
service life under appropriate conditions of exposure.
For concrete made with normal-weight aggregate and used in foundations and slabs for low rise structures
in non-aggressive soil conditions (see 'aggressive chemical environment for concrete (ACEC) class AC-1
of Table A.2 of BS 8500-1:2006(), a minimum strength class of C8/10 may be used provided the minimum
cement content is not less than 180 kg/m3 for other types of concrete.
The compressive strength class of concrete appropriate for use should be selected from the preferred
compressive strength classes in 'Table 7 and Table 8 of BS EN 206-1:2000 and the Note to A.4.2 of
BS 8500-1:2006( taking account of the following factors:
'A.4, Table A.4 and Table A.8 of BS 8500-1:2006();
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In such cases the specified nominal cover should generally be increased beyond the values given in
'Table A.4 of BS 8500-1:2006( to ensure that an adequate minimum cover will be obtained. For this
reason, the nominal cover specified where concrete is cast directly against the earth should generally be
not less than 75 mm. Where concrete is cast against an adequate blinding, a nominal cover of less than
'50 mm( (excluding blinding) should not generally be specified.
The cover required to protect the reinforcement against corrosion depends on the exposure conditions and
the quality of the concrete as placed and cured immediately surrounding the reinforcement. 'Table A.3,
Table A.4 and Table A.9 of BS 8500-1:2006( give limiting values for the nominal cover of concrete made
with normal-weight aggregates as a function of these factors. There may be cases where extra precautions
are needed beyond those given in 3.3.4 in order to ensure protection of the reinforcement. Further
information is given in 3.1.5.
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Concrete to meet the requirements of 'Table A.4, Table A.8 and Table A.9 of BS 8500-1:2006( should
be specified as designated concrete, designed concrete or standardized prescribed concrete in accordance
with BS 8500-1 and BS 8500-2.
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N
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Ì
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Ì
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¼
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The appropriate compressive strength class of concrete should be selected from the preferred strength
classes in 'Table 7 and Table 8 of BS EN 206-1:2000 and the Note to A.4.2 of BS 8500-1:2006(.
Strength classes C28/35 and C32/40 are the minimum recommended for post-tensioning and pre-tensioning
respectively. In both cases the concrete strength at transfer should be not less than 25 N/mm2.
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⁄
§
©
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§
©
·
¹
· §
¹ ©
·
¹
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Õ
Õ
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Õ
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Æ
Ì
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
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The exposure conditions for the structural element should be assessed in accordance with 3.3.4 and the
required nominal cover, strength class and associated mix limitations obtained from 'Table A.4 of
BS 8500-1:2006( except that maximum water/cement ratios greater than 0.60 should not be used.
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(
(
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×
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¼
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³
³
³
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Õ
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All cements indicated in 'Table A.6 of
BS 8500-1:2006( except for CEM I 42.5 or
CEM I 52.5 to BS EN 197-1, SRPC 42.5 to
BS 4027 and supersulfated cement.
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a) increase the specified minimum temperature of the fresh concrete in accordance with 'A.9.2 of
BS 8500-1:2006(;
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Guidance on the selection of materials and specifying concrete for work in hot weather is given in 'A.9.3
of BS 8500-1:2006(.
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¯
¯
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The grouting and prestressing tendons should be in accordance with the revised editions of BS EN 445,
BS EN 446 and BS EN 447 (expected to be published in '2007) and BS EN 13670 (not yet
published)(. Until these 'Text deleted( are published, these objectives can be met by following the
procedures outlined in Model specification for bonded and unbonded post-tensioned flat slabs.
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'BS 8500-1:2006(, Concrete — Complementary British Standard to BS EN 206-1 — Part 1: Method of
specifying and guidance for the specifier.
'BS 8500-2:2006(, Concrete — Complementary British Standard to BS EN 206-1 — Part 2:
Specification for constituent materials and concrete.
'BS EN 206-1:2000, Concrete — Part 1: Specification, performance, production and conformity.(
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UK CARES. Model specification for bonded and unbonded post-tensioned flat slabs. Kent: UK CARES,
'Second edition, 2006(.
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BS 8110-1:1997
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