RPF Task Group RPF Task Group FeedbackFeedback

Lab Accreditation TGLab Accreditation TGSkills Development TGSkills Development TG

11/12 May 200511/12 May 2005

BackgroundBackground

Task group formed to look at Lab Task group formed to look at Lab AccreditationAccreditation

Shortfall in accreditation process - lack Shortfall in accreditation process - lack of a proficiency scheme to ISO 43of a proficiency scheme to ISO 43

Proposal developed for a National Proposal developed for a National Proficiency SchemeProficiency Scheme

Stakeholder workshop to discuss Stakeholder workshop to discuss proposal (Feb ‘04)proposal (Feb ‘04)

Pilot study (2004/05)Pilot study (2004/05)– WCPAWCPA– GautransGautrans

Feedback of results (Feb ‘05)Feedback of results (Feb ‘05)

Laboratory Proficiency Laboratory Proficiency Workshop – 11 Feb Workshop – 11 Feb 20042004 Strong industry representation the Strong industry representation the

would act as the coordinating body would act as the coordinating body (NPASR)(NPASR)

All in favour of a national proficiency All in favour of a national proficiency schemescheme– Problem with reference labsProblem with reference labs– Needed to be cost-effectiveNeeded to be cost-effective

All accepted a pilot study to be run by All accepted a pilot study to be run by Gautrans and Western CapeGautrans and Western Cape

3 tests to be investigated3 tests to be investigated– Atterberg limitsAtterberg limits– Bitumen penetrationBitumen penetration– Sieve analysis Sieve analysis

Feedback from Pilot Feedback from Pilot StudyStudy

February 2005February 2005

NPASRNPASRNPASRNPASR

Projects for 2004:

Particle Size Distribution (gradation)TMH-1 method A1(a)

National Proficiency Assessment Services for Roads

Plasticity Index (Atterberg)TMH-1 method A2TMH-1 method A3

Penetration of 80/100 pen. bitumen.ASTM D5-1997.

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 001

Assigned value: 15 (%) – Consensus value (expert)

Source: Controlled gradation made up.

Variability: %)Source: Typical (E-values)

Response: % Retained on 19,0 mm

z-Limit at C.L. 95% : X 4,1%)2z-Limit at C.L. 95% : X 8,2 (%)

GRADATION

19 mm sieve

Laboratory

% R

eta

ine

d (

ma

ss)

6

8

10

12

14

16

18

20

22

24

0 1 2 3 4 5 6 7 8 9 10

2z

z

2z

z

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 001

GRADATION

% Retained on 19,0 mm

Mean values

Laboratory

% R

eta

ine

d o

n 1

9,0

mm

6

8

10

12

14

16

18

20

22

24

1 2 3 4 5 6 7 8 9

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 001

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 001

Outlier laboratory:

Property: % Retained on 19,0 mm (a) Analysis of variance F-value = 2,315 F-crit = 2,510 Result: Accept H0

(b) Tukey q(0.05,df(error)=18,k=9) = 4,96 (Tukey statistic) Result: No significant individual pair differences.

(c ) Dunnett q(0.05,df(error)=18,k=9) = 2,94 (Dunnett statistic) Result: No significant difference from control

GRADATION

4.75 mm sieve

Laboratory

% R

eta

ine

d (

ma

ss)

12

14

16

18

20

22

24

26

28

0 1 2 3 4 5 6 7 8 9 10

2z

2z

z

z

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 001

GRADATION

0.425mm sieve

Laboratory

% R

etai

ned

(mas

s)

6

8

10

12

14

16

18

20

0 1 2 3 4 5 6 7 8 9 10

z

z

2z

2z

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 001

LIQUID LIMIT

Casagrande method

Laboratory

Liq

uid

Lim

it (%

)

22

23

24

25

26

27

28

29

30

31

32

0 1 2 3 4 5 6 7 8 9 10

z

z

2z

2z

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 002

PLASTIC LIMIT

Casagrande method

Laboratory

Pla

stic

Lim

it (%

)

12

13

14

15

16

17

18

19

20

21

22

0 1 2 3 4 5 6 7 8 9 10

z

z

2z

2z

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 002

PLASTIC INDEX

Western Cape

Laboratory

Pla

stic

In

de

x (%

)

2

4

6

8

10

12

14

16

18

0 1 2 3 4 5 6 7 8 9 10

Casagrande

1 Point

2 Point

z

z

2z

2z

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 002

BITUMEN PENETRATION

80/100 pen. bitumen at 25 deg. C

Laboratory

Pe

ne

tra

tion

(0

.1 m

m)

40

45

50

55

60

65

70

75

80

85

90

95

100

0 1 2 3 4 5 6 7

Set A

Set B

z

z

2z

2z

NPASRNPASRNPASRNPASRNational Proficiency Assessment Services for Roads

Service provider: P.A.W.C. PTP 2004 / 003

Agreements from the Agreements from the meetingmeeting Gautrans to feedback their results to Gautrans to feedback their results to

the participating laboratoriesthe participating laboratories Scheme to be structured in line with Scheme to be structured in line with

ISO 43 (formal process not a round ISO 43 (formal process not a round robin process)robin process)

Scheme should be coordinated Scheme should be coordinated nationally and run regionallynationally and run regionally

Scheme should be self-supporting and Scheme should be self-supporting and run on a cost-recovery basis.run on a cost-recovery basis.

Initial funding to kick-start the Initial funding to kick-start the processprocess

Executive Board of potential funders Executive Board of potential funders identified to move the process forwardidentified to move the process forward

Executive BoardExecutive Board

SANRALSANRAL K vd Walt/W WeberK vd Walt/W Weber WCPAWCPA M HendersonM Henderson GautransGautrans C TaljaardC Taljaard C & CIC & CI B PerrieB Perrie SabitaSabita P MyburghP Myburgh Commercial LabsCommercial Labs T MilneT Milne Technical AdvisorTechnical Advisor B DumasB Dumas CoordinatorCoordinator L SampsonL Sampson

ActionsActions

J Venter (SAACEL regional Chair) to drive J Venter (SAACEL regional Chair) to drive process in KZN in association with KZN process in KZN in association with KZN DoT (K Ducasse)DoT (K Ducasse)

L Sampson and B Dumas to rework original L Sampson and B Dumas to rework original proposal with costs for establishing the proposal with costs for establishing the scheme and submit to Ex Co for discussionscheme and submit to Ex Co for discussion

Ex Co to be organised before May RPFEx Co to be organised before May RPF All members of (NPASR) to be kept All members of (NPASR) to be kept

informed of progress by Ex Coinformed of progress by Ex Co Next three testsNext three tests

– MDD/OMC using Mod AASHTOMDD/OMC using Mod AASHTO– Marshall stability and flow for asphalt mixesMarshall stability and flow for asphalt mixes– ALD for aggregatesALD for aggregates

Skills DevelopmentSkills Development

StatusStatus

National Certificate in the supervision of National Certificate in the supervision of construction processes in place at NQF construction processes in place at NQF level 4level 4– Learning material being developedLearning material being developed– Implications to the industryImplications to the industry

National certificate in construction National certificate in construction materials manufacturing (NQF 2 – 6)materials manufacturing (NQF 2 – 6)– under developmentunder development

National certificate in Materials Testing National certificate in Materials Testing under development (NQF 2 – 7)under development (NQF 2 – 7)– On hold pending a new workshop to rethink On hold pending a new workshop to rethink

the qualification structurethe qualification structure