Modern Concept and Approach Control of Quality

8/3/2019 Modern Concept and Approach Control of Quality

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Modern concept and approach

to control of quality ofproduction of concrete

Professor Tom HarrisonChairman BSI concrete committeeTechnical Director QPA-BRMCA


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Structure of presentations

Introduction to concepts andpracticeConcrete families

Conformity (BS EN 206-1)The future (ISO 22965)


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Introduction to conceptsand practice

09.45 10.15


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The production of concreteThe production of concrete


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DRY BATCHPROCESS

WET BATCHPROCESS

Weigh

hoppers

AggregatesCementitious

materials

Water

Admixtures

Mixer


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The reality of production controlThe reality of production control

When batching aggregates, account isWhen batching aggregates, account is

taken of any surplus watertaken of any surplus water


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Concrete familiesConcrete families

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ConformityConformity

and identityand identitytestingtesting

11.1511.15 11.4511.45


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Formalised procedure undertaken byproducer to verify that the claims made onthe delivery ticket are valid

Replaces BS 5328 compliance testing


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By producer

Applies to specified properties in BS8500 and limiting values


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Where relevant properties and

composition do not change significantlybetween place of sampling and place ofdelivery

Therefore sampling at plant permitted

There are benefits and disadvantages withplant sampling


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C28/35 specified

Minimum characteristic cube strengthrequired is 35 N/mm2


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Individual criterion, fci fck 4Example, fci 35 4 = 31 N/mm

2

Mean of 3 consecutive test results fck + 4

Example, fcm3 35 + 4 = 39 N/mm2


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Applied as consecutive groups of 3 non-overlapping results or as a running mean

of 3

Criteria developed on basis of non-overlapping results


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This is the most important of the criteria

Mean of n tests fck + 1.48 where n 15

Example, fcm

35 + 1.48x4 = 41 N/mm2

Individual criterion, fci fck 4


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Producer can select to apply as non-overlapping results or as overlappingresults

Criteria based on non-overlapping results


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With 15 results, there is a 30% probabilityof rejecting a population that just achievesthe specified characteristic strength


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This will be to BS 8500-2

The amendment to BS 8500-2 requiresconformity to requirements in BS EN 206-1,therefore conformity to BS 8500-2 includesconformity to BS EN 206-1

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Where confirmed non-conformity notobvious at time of testing, producer shallinform specifier and user

Non-conformities obvious at

delivery/testing e.g. consistence, shall beeither accepted or rejected there and then

Non-conformities not obvious at deliveryinclude strength, maximum w/c ratio andminimum cement content

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Producer will check test data for validityand whether they were entered correctlyinto the system

Producer will identify the cause of non-conformity, the non-conforming concretes

and the period of non-conformity

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The concrete will only be declared as

non-conforming where this failure tocomply also leads to a non-conformitywith respect to BS EN 206-1 clause 8 orthe specification for the concrete

In all cases, the producer is required to

review the reason for non-compliance withtheir procedures and take appropriateaction

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Strongly recommended

Provides independent audit by experts that

conformity was undertaken correctly by theproducer and that any non-conformitieswere reported correctly

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When there is doubt about the quality of a

batchFor spot checks on the producer

For special concretes, e.g. very highstrength concrete

Routine identity testing is rarely needed

Specifier may need strength tests forother purposes, e.g. formwork striking,

prestressing


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The future (ISO 22965)The future (ISO 22965)

11.5011.50 12.2012.20

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Thank you for your attention

Documents

Modern Concept and Approach Control of Quality