Download SS EN 13791-2009 PDF

TitleSS EN 13791-2009
File Size138.5 KB
Total Pages6
Document Text Contents
Page 1

NOT FOR SALE
OUTSIDE SINGAPORE

SINGAPORE STANDARD

SS EN 13791 : 2009
EN 13791 : 2007, IDT
(ICS 91.080.40)

















Assessment of in-situ
compressive strength in
structures and precast
concrete components



This national standard is the identical implementation of EN 13791 : 2007 and is adopted
with permission of CEN, Rue de Stassart 36, B-1050 Brussels
















Published by
SPRING Singapore
2 Bukit Merah Central
Singapore 159835
SPRING Singapore Website: www.spring.gov.sg
Standards Website: www.standards.org.sg

Page 2

NOT FOR SALE
OUTSIDE SINGAPORE

SINGAPORE STANDARD

SS EN 13791 : 2009
EN 13791 : 2007, IDT
(ICS 91.080.40)

















Assessment of in-situ
compressive strength in
structures and precast
concrete components



This national standard is the identical implementation of EN 13791 : 2007 and is adopted
with permission of CEN, Rue de Stassart 36, B-1050 Brussels











All rights reserved. Unless otherwise specified, no part of this Singapore
Standard may be reproduced or utilised in any form or by any means,
electronic or mechanical, including photocopying and microfilming, without
permission in writing from SPRING Singapore at the address below:

Head
Standardisation Department
SPRING Singapore
2 Bukit Merah Central
Singapore 159835
Telephone: 62786666 Telefax: 62786667
Email: [email protected]

ISBN 978-981-4278-19-5

Page 3

SS EN 13791 : 2009

5

Contents
Page


National Foreword 6

Introduction 7


CLAUSES

1 Scope 9

2 Normative references 9

3 Terms and definitions 10

4 Symbols and abbreviations 10

5 Principles 11

6 Characteristic in-situ compressive strength in relation to compressive strength class 12

7 Assessment of characteristic in-situ compressive strength by testing of cores 12

8 Assessment of characteristic in-situ compressive strength by indirect methods 14

9 Assessment where conformity of concrete based on standard tests is in doubt 20

10 Assessment report 21


ANNEXES

A (informative) Factors influencing core strength 22

B (informative) Factors influencing results by indirect test methods 24

C (informative) Concepts concerning the relationship between in-situ strength and strength
from standard test specimens 25

D (informative) Guidelines for planning, sampling and evaluation of test results when
assessing in-situ strength 26

National Annex ZZA (informative) Additional guidance for UK users 29

National Annex ZZB (informative) Additional guidance for Singapore users 31


TABLES

1 Minimum characteristic in-situ compressive strength for the SS EN 206-1
compressive strength classes 12

2 Margin k associated with small numbers of test results 14

3 Coefficient k1 dependent on the number of paired tests 19

FIGURES

1 Principle for obtaining the relationship between in-situ compressive strength and indirect
test data 17

2 Basic curve for rebound hammer test 18
3 Basic curve for ultrasonic pulse velocity test 18
4 Basic curve for pull out force test 19

Bibliography 28

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SS EN 13791 : 2009

6



National Foreword

This Singapore Standard was prepared by the Technical Committee on Building Structure and Sub-
structure under the purview of the Building and Construction Standards Committee.

This standard is identical to EN 13791 : 2007 ‘Assessment of in-situ compressive strength in
structures and precast concrete components’ with the addition of Annex ZZB – ‘Additional guidance
for Singapore users’, and adopted with permission of CEN, Rue de Stassart 36, B-1050 Brussels.
100 mm and 150 mm cubes are the standard specimens for compressive strength testing in
Singapore and Annex ZZB provides more specific guidance for use in Singapore. The principles are
in agreement with those in EN 13791 : 2007.

Annex ZZB, prepared for Singapore users, is to be considered together with Annex ZZA (informative)
– ‘Additional guidance for UK users’, adopted from BS EN 13791 : 2007.

Acknowledgement is made for the use of information from the above reference.

At the time of publication, this standard is expected to be used as a reference in the Building and
Construction Authority’s ‘Approved document – Acceptable solutions’.

Attention is drawn to the possibility that some of the elements of this Singapore Standard may be the
subject of patent rights. SPRING Singapore shall not be held responsible for identifying any or all of
such patent rights.


























NOTE

1. Singapore Standards are subject to periodic review to keep abreast of technological changes and new

technical developments. The changes in Singapore Standards are documented through the issue of either
amendments or revisions.


2. Compliance with a Singapore Standard does not exempt users from legal obligations.

Page 5

SS EN 13791 : 2009

7




Introduction


This Singapore Standard provides techniques for estimating in-situ compressive strength in concrete
structures and precast concrete components. Testing in-situ strength takes into account the effects of
both the materials and execution (compaction, curing, etc.).

These tests do not replace concrete testing according to SS EN 206-1.

SS EN 206-1 refers to the guidance of this standard for assessing the strength in structures and
precast concrete components.

The following examples illustrate where this estimate of in-situ strength of concrete may be required:

− when an existing structure is to be modified or redesigned;

− to assess structural adequacy when doubt arises about the compressive strength in the

structure due to defective workmanship, deterioration of concrete due to fire or other causes;

− when an assessment of the in-situ concrete strength is needed during construction;

− to assess structural adequacy in the case of non-conformity of the compressive strength

obtained from standard test specimens;

− assessment of conformity of the in-situ concrete compressive strength when specified in a

specification or product standard.

Where identified in this standard, national provisions are permitted or required.

An outline of the procedures for these different uses of this standard is given in Flowchart 1.

For specific production conditions and constituent materials, development of economic design where
permitted by national provisions may be possible through the assessing the partial safety factor, γc
from knowledge of the in-situ compressive strength and the strength of standard test specimens.

When assessing compressive strengths in cases other than checking the quality of the concrete or the
workmanship during execution or before accepting the structure for use, the appropriate reduction in
the partial safety factor should be determined on a case-by-case basis according to national
provisions.

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