I.S. 465:2018+A1:2020

About standard

Assessment, testing and categorisation of damaged buildings incorporating concrete blocks containing certain deleterious materials and Amendment 1:2020

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NSAI in exercise of the power conferred by section 16 (3) of the National Standards Authority of Ireland Act, 1996 (No. 28 of 1996) and with the consent of the Minister for Business, Enterprise and Innovation, hereby declare as follows:

1. This instrument may be cited as the Standard Specification (Assessment, testing and categorisation of damaged buildings incorporating concrete blocks containing certain deleterious materials and Amendment 1:2020) Declaration, 2020.

2.
(1) The Standard Specification set forth in the Schedule to this declaration is hereby declared to be the Standard Specification for Assessment, testing and categorisation of damaged buildings incorporating concrete blocks containing certain deleterious materials and Amendment 1:2020.

(2) The said Standard Specification may be cited as Irish Standard 465:2018+A1:2020 or as I.S. 465:2018+A1:2020.

3.
(1) The Standard Specification (Assessment, testing and categorisation of damaged buildings incorporating concrete blocks containing certain deleterious materials) Declaration 2018 is hereby revoked.

(2) Reference in any other standard specification to the Instrument hereby revoked and to Irish Standard 465:2018 thereby prescribed, shall be construed, respectively, as references to this Instrument and to Irish Standard 465:2018+A1:2020

Published: Published on 25 September, 2020.

The National Standards Authority of Ireland (NSAI) produces the following categories of formal documents:

I.S. xxx: Irish Standard — national specification based on the consensus of an expert panel and subject to public consultation.

S.R. xxx: Standard Recommendation — recommendation based on the consensus of an expert panel and subject to public consultation.

SWiFT xxx: A rapidly developed recommendatory document based on the consensus of the participants of an NSAI workshop.

COPYRIGHT :

© NSAI 2020

No copying without NSAI permission except as permitted by copyright law.

Foreword

This Irish Standard was developed by the NSAI Concrete Blocks Committee (NSAI/TC 063). Arising from the Report of the Expert Panel on Concrete Blocks (June 2017) [1] this Irish Standard has been developed for use by those who intend to provide assessment and testing services for dwellings that are suspected of being affected by defective concrete blocks.

This is the first edition of this Irish Standard.!Amendments are indicated by the TAGs !

This Irish Standard is not intended for:

a) the specification, manufacture and testing for compliance of new concrete blocks (aggregate concrete masonry units) in accordance with I.S. EN 771–3 (and associated testing Standards) or as a replacement to the guidance provided in Standard Recommendation S.R. 325; and

b) dwellings not exhibiting structural damage consistent with defective concrete blocks, see Clause 4. ! This document, I.S. 465:2018+A1:2020 has been prepared by the NSAI concrete Blocks Committee (NASI/TC 063).

This document is an amendment to I.S. 465:2018 - Assessment, testing and categorisation of damaged buildings incorporating concrete blocks containing certain deleterious materials.

The Expert Panel on concrete blocks in Donegal and Mayo was reconvened by the Department of Housing, Planning and Local Government (DGPLG) to provide clarification in respect of Option 1 in Table 5.2 of the Report of the expert panel on concrete blocks.

On foot of a clarification issued by the Expert panel to the DHPLG in relation to Option 1 in Table 5.2 of their report in December 2019 it is necessary to include this clarification in I.S. 465:2018 as Table 5.2 has been reproduced verbatim in Table D.2 in Annex D of this standard.

A new Annex F which contains the text of the clarification is included in this amendment along with an additional note in Clause 8.3 referring the reader to the new Annex F.

A further footnote is included in Table D.2 referring the reader to the new Annex F." Compliance with this Irish Standard does not of itself confer immunity from legal obligations.

Schedule

1 Scope

This Irish Standard:

a) establishes a protocol for assessing and determining whether a building has been damaged by concrete blocks containing excessive amounts of certain deleterious materials (aggregate containing free or unbound muscovite mica or potentially deleterious quantities of pyrite);

b) describes methods for establishing the extent of the problem and categorises dwellings;

c) describes the scope of any testing required and evaluation of the findings; and

d) provides the Chartered Engineer with guidance on the selection of appropriate remedial works to be undertaken.

This Irish Standard is not intended for:

a) the specification, manufacture and testing for compliance of new concrete blocks (aggregate concrete masonry units) in accordance with I.S. EN 771-3 (and associated testing Standards) or as a replacement to the guidance provided in Standard Recommendation S.R. 325; and

b) dwellings not exhibiting structural damage consistent with defective concrete blocks, see Clause 4. The protocol addresses the issue of defective concrete blocks but does not rule out other potential defects in a dwelling which may for other reasons require remedial attention.

The use of this Irish Standard is limited to concrete block-built dwellings exhibiting signs of distress consistent with damage caused by blocks containing certain deleterious materials

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

I.S. EN 197-1, Cement – Part 1: Composition, specifications and conformity criteria for common cements

I.S. EN 771-3, Specification for masonry units – Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates)

I.S. EN 772-1, Methods of test for masonry units – Part 1: Determination of compressive strength

I.S. EN 1744-1:2009+A1:2012, Tests for chemical properties of aggregates – Part 1: Chemical analysis

I.S. EN 12504-1, Testing concrete in structures – Part 1: Cored specimens – Taking, examining and testing in compression

S.R. 325, Recommendations for the design of masonry structures in Ireland to Eurocode 6

BS 1881-124:2015, Testing concrete – Part 124: Methods for analysis of hardened concrete