Title: FEEDBACK ON
1FEEDBACK ON SANRAL / SAACE /SAFCEC
WORKSHOP ON LABORATORY ACCREDITATION
MANAGEMENT Held on 28 MARCH 2003
2INTRODUCTION
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
3INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING
INTERLAB CORRELATION Binders Cement
stabilisation new findings
MANAGEMENT OF SITE LABORATORIES
SANAS ACCREDITATION Â Â Main Laboratory Site
Laboratory temporary accreditation
COMBINED LABORATORY PROPOSAL (Acceptance and
Process Control)
COMBINED LABORATORIES Â The Contractors
Perspective
4MTC is responsible for the Standard Test Methods
regarding Evaluation
Upgrading
Publishing
5http//Asphalt.CSIR.co.za/tmh
6Although 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
7INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
8Proficiency 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.
9Precision
A generic concept related to the closeness of
agreement between test results obtained under
prescribed like conditions from the measurement
process being evaluated.
10Data Representation
- Dry Density vs Moisture Content
relationshipASTM D1557 plot the values and
draw the compaction curve as a smooth curve
through the points.
11(No Transcript)
12Data Representation
- CBR vs Dry Density relationshipASTM D1883
plot the values and draw the compaction curve as
a smooth curve through the points.
13CBR vs Compaction
CBR
CBR
CBR
Compaction ()
Compaction ()
Compaction ()
CBR
CBR
Compaction ()
Compaction ()
14INTRODUCTION
STANDARDISATION OF TEST METHODS Barry Dumas
NATIONAL PROFICIENCY TESTING Barry Dumas
INTERLAB CORRELATION Russell Clayton
Binders Cement stabilisation new findings
15SANRAL /SAACE/SAFCEC Workshop on Laboratory
Accreditation
- Inter-Laboratory Correlation Testing of Binders
- Curing of Cement Stabilized Laboratory Samples
- By Russell Clayton
- Ninham Shand Consulting
16SANRAL /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
17SANRAL /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)
18TESTER 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
19Curing 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
20CONCLUSIONS
- 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
21CONCERNS
- 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
22INTRODUCTION
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
23CONSTRUCION MATERIALS AND MANAGEMENT OF
LABORATORIES
- 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
24INTRODUCTION
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
25Agenda
- Overview of SANAS
- Accreditation of Base (main) labs to SABS ISO/IEC
17025 - Accreditation of Site laboratories (SANAS R52-1
document)
26INTRODUCTION
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)
27COMBINED LABORATORY PROPOSAL
Presented by Johan Gillmer 28 March 2003
28COMBINED 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
29(No Transcript)
30COMBINED 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.
31COMBINED 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.
32INTRODUCTION
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
33ISSUES
- 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
34ISSUES
- 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
35RECOMMENDATIONS
- 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. -
36RECOMMENDATIONS
- 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. -
37RECOMMENDATIONS
- 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. -