FEEDBACK ON

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FEEDBACK ON SANRAL / SAACE /SAFCEC
WORKSHOP ON LABORATORY ACCREDITATION
MANAGEMENT Held on 28 MARCH 2003
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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
INTERLAB CORRELATION Russell Clayton
Binders Cement stabilisation new findings
MANAGEMENT OF SITE LABORATORIES Wesley Weber
SANAS ACCREDITATION Rob Damhuis   Main
Laboratory Site Laboratory temporary
accreditation
COMBINED LABORATORY PROPOSAL Johan
Gillmer (Acceptance and Process Control)
COMBINED LABORATORIES - Poens Venter  The
Contractors Perspective
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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING
INTERLAB CORRELATION Binders Cement
stabilisation new findings
MANAGEMENT OF SITE LABORATORIES
SANAS ACCREDITATION   Main Laboratory Site
Laboratory temporary accreditation
COMBINED LABORATORY PROPOSAL (Acceptance and
Process Control)
COMBINED LABORATORIES  The Contractors
Perspective
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MTC is responsible for the Standard Test Methods
regarding Evaluation
Upgrading
Publishing
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http//Asphalt.CSIR.co.za/tmh
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Although the members of MTC are mainly from the
Road Authorities the industry is nevertheless
invited to partake in the process of upgrading
the Standard Test Methods.All recommendations
can be addressed to
MTCThe SecretariatFax 021 - 483-3620
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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
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Proficiency testing continues to be the best
mechanism for ensuring that laboratory tests are
being performed properly. This is also applicable
to accredited laboratories, because proficiency
testing on accredited laboratory tests is a vital
component of the laboratorys quality assurance
program. Proficiency testing is a good risk
management tool for the laboratory and provides
confidence in the correctness of the results
obtained.
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Precision
A generic concept related to the closeness of
agreement between test results obtained under
prescribed like conditions from the measurement
process being evaluated.
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Data Representation

• Dry Density vs Moisture Content
  relationshipASTM D1557 plot the values and
  draw the compaction curve as a smooth curve
  through the points.

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Data Representation

• CBR vs Dry Density relationshipASTM D1883
  plot the values and draw the compaction curve as
  a smooth curve through the points.

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CBR vs Compaction
CBR
CBR
CBR
Compaction ()
Compaction ()
Compaction ()
CBR
CBR
Compaction ()
Compaction ()
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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
INTERLAB CORRELATION Russell Clayton
Binders Cement stabilisation new findings
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SANRAL /SAACE/SAFCEC Workshop on Laboratory
Accreditation

• Inter-Laboratory Correlation Testing of Binders
• Curing of Cement Stabilized Laboratory Samples
• By Russell Clayton
• Ninham Shand Consulting

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SANRAL /SAACE/SAFCEC Workshop on Laboratory
Accreditation

• Binder Testing
• 3 BINDERS
• 60-70 penetration grade
• 80-100 penetration grade
• Class SE-1 (RMB3)
• 2 TESTS
• Softening point
• Penetration
• TEST CONDITIONS
• Normal test procedure
• After 48hrs ageing in fridge

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SANRAL /SAACE/SAFCEC Workshop on Laboratory
Accreditation

• TESTER EXPERIENCE ON SOFTENING POINT
• Test Results not affected by
• Age
• Years Testing Experience
• Education and Tertiary Training
• Industry Training
• Test Results affected by
• Years Binder Testing Experience
• Younger (less experienced testers have more
  erratic results)

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TESTER EXPERIENCE ON PENETRATION

• No correlation could be determined by the
  following
• Age
• Years Testing Experience
• Years Binder Testing Experience
• Education and Tertiary Training
• Industry Training
• SANRAL /SAACE/SAFCEC Workshop on
  Laboratory Accreditation

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Curing of Cement Stabilized Laboratory Samples

• Reasons for the Investigation
• Cement specification and behavior has changed
• Problems were being experienced with compaction
• Contractors being asked to rework material and
  re-dose with cement because of low 24hrs UCS
  strengths
• Some doubt regarding the appropriate laboratory
  design curing procedures
• SANRAL /SAACE/SAFCEC Workshop on
  Laboratory Accreditation

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CONCLUSIONS

• The 24 hrs curing under estimates the 7 day
  strengths
• The 40 hrs curing predicts closer 7day UCS
  strengths
• Higher ITS results are achieved with 40hrs
  curing but not as close to 7day strengths
• Not shown.. But the same response has occurred
  with blends of crushed dolerite or
  sandstone,weathered dolerite and sandstone ROC
• SANRAL /SAACE/SAFCEC Workshop on Laboratory
  Accreditation

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CONCERNS

• Long term strengths of 4.5MPa UCS are being
  achieved at 90days for a C3 material..is this
  correct
• Long term strengths of 500kPa ITS are being
  achieved at 90days for a C3 material..is this
  also correct
• Stabilizer contents are being recommended on
  24hrs curing. In the long term, over
  stabilization and cracking is likely to occur
• Does our mechanistic analysis procedures consider
  this ?
• We may be wasting money by over-dosing with
  cement
• SANRAL /SAACE/SAFCEC Workshop on Laboratory
  Accreditation

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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
INTERLAB CORRELATION Russell Clayton
Binders Cement stabilisation new findings
MANAGEMENT OF SITE LABORATORIES Wesley Weber
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CONSTRUCION MATERIALS AND MANAGEMENT OF
LABORATORIES

• CONTENTS

• Responsibility of Laboratory
• Responsibility for Quality Control
• Quality Assurance
• Responsibility of the Engineer
• Responsibility and duties of Materials
  Supervisory Staff
• Materials Staff Requirements and Training

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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
INTERLAB CORRELATION Russell Clayton
Binders Cement stabilisation new findings
MANAGEMENT OF SITE LABORATORIES Wesley Weber
SANAS ACCREDITATION Rob Damhuis   Main
Laboratory Site Laboratory temporary
accreditation
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Agenda

• Overview of SANAS
• Accreditation of Base (main) labs to SABS ISO/IEC
  17025
• Accreditation of Site laboratories (SANAS R52-1
  document)

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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
INTERLAB CORRELATION Russell Clayton
Binders Cement stabilisation new findings
MANAGEMENT OF SITE LABORATORIES Wesley Weber
SANAS ACCREDITATION Rob Damhuis   Main
Laboratory Site Laboratory temporary
accreditation
COMBINED LABORATORY PROPOSAL Johan
Gillmer (Acceptance and Process Control)
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COMBINED LABORATORY PROPOSAL
Presented by Johan Gillmer 28 March 2003
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COMBINED LABORATORY PROPOSAL CONTENTS OF
PRESENTATION

• 1. CONTRACTUAL OBLIGATIONS

2. HISTORY OF TESTING 3. COMBINED LABORATORY
SPECIFICATION 3.1 Objectives 3.2 Contents 4.
CASE STUDY 4.1 Procedural data 4.2 Monthly /
accumulative cost to the contractor 4.3 Monthly
/ accumulative cost to the employer 5. CONCLUSION
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COMBINED LABORATORY PROPOSAL CONCLUSION
1. REGARDED AS A FAIR SPECIFICATION FOR THE
FOLLOWING REASONS

• The choice of a test laboratory remains with the
  contractor.

• The contribution of the contractor to the
  employers cost of having a site laboratory can
  be determined and is related to the actual
  process control testing required.

• The employer is compensated for the additional
  cost to work outside normal working hours.
• The system offers an incentive to the well
  organised and competent contractor who works
  according to a structured quality assurance
  system and produces work of quality.

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COMBINED LABORATORY PROPOSAL CONCLUSION
(continued)
2. REFINENMENT OF SPECIFICATION

• Feed back from employer / contractors /
  consultants should be addressed.
• Overtime classification should be clearly
  defined.
• Unit rates for testing (Schedule A) of samples
  should be market related.
• Hourly rates (Schedule B) of lab staff should be
  related to the consultants team for the specific
  site.
• The determination of the value of the approved
  contractors staff and equipment should be clearly
  defined.

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INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
INTERLAB CORRELATION Russell Clayton
Binders Cement stabilisation new findings
MANAGEMENT OF SITE LABORATORIES Wesley Weber
SANAS ACCREDITATION Rob Damhuis   Main
Laboratory Site Laboratory temporary
accreditation
COMBINED LABORATORY PROPOSAL Johan
Gillmer (Acceptance and Process Control)
COMBINED LABORATORIES - Poens Venter  The
Contractors Perspective
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ISSUES

• Payment for overtime worked by laboratory staff
• Consistency of testing
• Expensive laboratory assistants in stead of
  training local people
• Tariffs where the Contractor has to pay for
  each process control test

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ISSUES

• Control/management of laboratories not good.
• Contractors are not tendering on equal grounds
• Assistance to Contractor with -
• Testing of Materials from Commercial Sources
• Finding Borrow Pits/Exploratory Testing
• Process Experiments, e.g. Compaction effort

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RECOMMENDATIONS

• The Employer and the Engineer should accept that
  a combined laboratory has a responsibility to
  ensure that the Contractors obligations to test
  in terms of COLTO98 are fully complied with.
  (Duty of Care)
• The management and control of the combined
  laboratory should be shared between the Engineer
  and the Contractor.
• Contributions to combined laboratories should be
  standardised to ensure that Contractors tender on
  an equal basis and to avoid confusion and
  ambiguity.

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RECOMMENDATIONS

• Shifts should be introduced to overcome the issue
  of overtime and work outside of normal working
  hours.
• SANRAL should consider appointing independent
  laboratories on site. This would improve
  relationships on site and would reduce conflict
  situations even further. Contractors would also
  have more faith that the laboratory would be
  unbiased.

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RECOMMENDATIONS

• Alternatively, SANRAL could call for tenders from
  commercial laboratories to perform process,
  quality and acceptance control testing on sites
  in a combined laboratory arrangement and then
  include the cost of the total service in the
  tender documents to which the Contractor would
  contribute.