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712002AAC SPECIFICATION

ISSUE 3

CONCRETE BLOCKS COPYRIGHT

AAC_SPEC_71200203.DOC Approved 4 April 2005 Page 1 of 4

For information or comments on this document please contact ATD QAAnglo Technical Division accepts no liability for any damage whatsoever that may result from the use of this materialor the information contained therein, irrespective of the cause and quantum thereof.

CONTENTS PAGE

1.0 SCOPE 22.0 TECHNICAL REQUIREMENTS TO BE SPECIFIED BY THE COMPANY 23.0 DEFINITIONS 24.0 REQUIREMENTS 24.1 TYPE 24.2 DIMENSIONS 24.3 COMPRESSIVE STRENGTH 25.0 QUALITY ASSURANCE PROVISIONS 25.1 QUALITY MANAGEMENT 26.0 TEST AND INSPECTION METHODS 36.1 DIMENSIONS 36.2 COMPRESSIVE TEST 37.0 MARKING LOADING AND STORING 37.1 MARKING 37.2 LOADING AND STORING 3APPENDIX A : RELATED DOCUMENTS 3APPENDIX B : RECORD OF AMENDMENTS 4

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1 SCOPE

This specification details the additional requirements for five types of solid concreteblocks that comply with the requirements of SANS 1215 for use underground in mines.This specification shall be read in conjunction with SANS 1215.

2 TECHNICAL REQUIREMENTS TO BE SPECIFIED BY THE COMPANYThe following requirements shall be specified in tender invitation and in orders orcontracts:

Title, number, issue and date of this specification.The block type (see clause 4.1).The dimensions of the block (see clause 4.2)The AAC stockcode.

3 DEFINITIONSFor the purpose of this specification, the following definitions shall apply:

APPROVED : Approved by the Engineer in writing.LOT : One days production of concrete blocks produced from one

concrete block making machine.SANS : South African National of Standards.

The following terms are defined in the General Conditions of Contract:

AAC, Company, Contractor. Engineer.

4 REQUIREMENTSThe concrete block shall comply with the requirements of SANS 1215 and therequirements of this specification. Where variations exist between this specificationand SANS 1215 then the requirements of this specification shall prevail.

4.1 TYPEThere shall be five types of concrete blocks, Types A, B, C, D and E. Type A blockshall conform to the requirements of AAC drawing No. 9900/0/2704, Type B to AACdrawing No. 9900/0/2705, Type C to AAC drawing No. 9900/0/2719, Type D to :AAC drawing No. Y2140 and Type E to AAC drawing No. Y2346.

4.2 DIMENSIONS

The dimensions of the concrete blocks shall comply with the requirements of therelevant AAC drawing.

4.3 COMPRESSIVE STRENGTHWhen tested in accordance with the requirements of Clause 6.2 the concrete blocksshall have a nominal compression strength of 14MPa in accordance with therequirements of SANS 1215.

5 QUALITY ASSURANCE PROVISIONS5.1 QUALITY MANAGEMENT

The requirements of QAP 101 shall apply.

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Each delivery of concrete blocks shall be accompanied by a despatch or delivery notewhich shall contain the following information:

TABLE 1: SAMPLING PLAN FOR INSPECTION AND COMPRESSIVE STRENGTH

LOT SIZE(maximum)

SAMPLE SIZE ACCEPT *REJECT

57000 50 7 10

*If the acceptance number has been exceeded but the rejection number has not beenreached, accept the lot but reinstate normal inspection. (see BS 6001 Clause 10.1.4)This table is extracted from BS 6001 (single reduced) Tables I and II-C.

6 TEST AND INSPECTION METHODS6.1 DIMENSIONS

The dimensions of the concrete blocks shall be measured using acceptable measuringmethods. The concrete blocks shall be inspected from the sample taken in accordancewith the requirements of Table 1 and shall comply with the requirements ofClause 4.2 and further comply with SANS 1215.

6.2 COMPRESSIVE TESTThe sample taken for inspection in accordance with the requirements of 6.1 shall, if itcomplies with the requirements of Clause 6.1 be used for the compressive test. Thecompressive test method shall comply with the test requirements of SANS 1215 and

the results of the tests shall comply with the requirements of Clause 4.3.7 MARKING LOADING AND STORING7.1 MARKING

Each delivery of concrete blocks shall be accompanied by a despatch or delivery notewhich shall contain the following information:

7.1.1 The type of concrete block.7.1.2 The AAC stockcode.7.1.3 Date of manufacture.7.1.4 The lot number.7.1.5 The dimensions of the block.

7.2 LOADING AND STORINGConcrete blocks shall be handled and stored in a manner which will not cause damageor defects.

8 APPENDIX A : RELATED DOCUMENTSUnless otherwise specified the latest issues of the following documents are deemed toform part of this specification.

QAP 101 : Quality management systemsSANS 1215 : Concrete masonry units9900/0/2704 : Concrete block. Type A

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9900/0/2705 : Concrete block. Type B9900/0/2719 : Concrete block. Type CY 2140 : Concrete block. Type DY 2346 : Concrete block. Type E

9 APPENDIX B : RECORD OF AMENDMENTS

Issue 2 : Block types 'D' and 'E' addedMinor amendments (M.J. Capper 95-01-20)

Issue 3 : 5 year review ( G Dryden and C ten Haaf 24.03.2005)

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