Improving Laboratory Performance through Cement Testing › wp-content › uploads › 2015 › 11...

Presented by

Nsesheye Susan Msinjili/Researcher

1 Nsesheye Susan Msinjili

PACE-PTS Public Symposium

Improving Laboratory Performance through Cement Testing

Nsesheye Susan Msinjili PACE-PTS Public Symposium

2

Background

3

WITS, South Africa

KIST, Kigali IGH, Croatia UBB, Burundi UEM,

Mozambique

UDSM, Tanzania

GDSM, Uganda

ACTP, South Africa

TUE, Netherlands

BAM, Germany UoL, DRC

SPIN

Light-SHIP

GABAss.

Consido AG

BMBF

Kenya

Uganda

Ghana

Namibia

Algeria

Mauritius

Sierra Leone

South Africa

Libya

Botswana

Zimbabwe

Rwanda

Senegal

Tanzania

Ethiopia

CAR

Congo

Mauritania

Nigeria

Gabon

Morocco

Tunisia

Egypt

D R Congo

Burundi Mozambique PPC

ARSO

PTB

PACE-PTS

RWTH

TUK

LUH

FH Dü

ACCTA-

YoS

TUB

UoK

EU

ACP

DST

UCT

SU

TUM

bauma Africa

UBP

Hydronix

EIRICH

QUB

MM NHBRC

Auburn U

IBU T

Hochs D.

Mak. U FH Pot

RILEM fib

CI

Other links

Background

Quality control of cement performance is crucial for the safety of the population and the durability of constructions

Reliable and standardised testing conditions in private and public laboratories are essential to ascertain high quality of product

The following are the main peculiarities of the cement market in Africa:



Background


5

Introduction: What is Proficiency Testing?

Necessities for PT

• Determination of performance of individual laboratories

• Determination of performance of specific tests or measurements

• Necessary to monitor continuous performance of the laboratories

• Provides inter-laboratory comparisons

• Provides a quality management tool for products obtained as well as institutionalises maintenace and organisation




Structure of a Typical PT Scheme

Preparation of uniform samples

Provider

Laboratories

Lab 1 Lab 2 Lab n ……

Testing according to agreed specifications

Reporting of individual results

Data collection and analyses

Boundary framework for testing

Anonymised data preparation

Corrective measures to improve performance




Aims of proficiency testing schemes

• To provide quality assurance for

individual laboratories

• To enable comparison of performance with other similar laboratories

• To know individual errors within each test

• To facilitate improvement

Benefits of participating in PT schemes • External and independent check on

data quality

• Assistance in identification of measurement problems providing motivation to improve

• Demonstration of quality and commitment to quality issues acts as a selling point

• Prevents loss of reputation due to poor performance increases competitiveness




Importance of PT Scheme

PT Scheme Where am I compared to peers?

How can I improve?

Where are my mistakes?




Participation only makes sense, if there is a will to see the real picture and to improve the performance.


10

Pan-African Proficiency Testing Scheme

(PACE-PTS)



WITS, South Africa

KIST, Kigali IGH, Croatia UBB, Burundi UEM,

Mozambique

UDSM, Tanzania

GDSM, Uganda

ACTP, South Africa

TUE, Netherlands

BAM, Germany UoL, DRC

SPIN Kenya

Uganda

Ghana

Namibia

Algeria

Mauritius

Sierra Leone

South Africa

Libya

Botswana

Zimbabwe

Rwanda

Senegal

Tanzania

Ethiopia

CAR

Congo

Mauritania

Nigeria

Gabon

Morocco

Tunisia

Egypt

D R Congo

Burundi Mozambique PPC

ARSO

PTB

PACE-PTS

Financial support by

Support of Technical activities

11

27 laboratories 25 public 2 private

2014/2015

30 laboratories 21 public 9 private

2012/2013




North Africa West Africa Central Africa East Africa South Africa Europe

- Algeria - Egypt - Mauritania - Morocco - Tunisia

- Nigeria - Ghana

- Central African Republic - Democratic Republic of Congo

- Ethiopia - Kenya - Rwanda - Tanzania - Uganda

- Botswana - Mauritius - Namibia - South Africa

- Croatia - Germany

Technical Procedure in 2013

Preparation and shipping of samples

Berlin, Germany

Testing and reporting

In each individual laboratory

Analysis of results and final reporting

Berlin, Germany

Final workshop for all participants with results

Berlin, Germany

Kick-off workshop for all registered participants

Dar es Salaam, Tanzania

Normal proficiency testing scheme

Extra components

Extra components

Technical Procedure in 2014/2015

Dar es Salaam, Tanzania




Technical Procedure in 2014/2015 • Testing and reporting is done according to the instructions provided

• Only final results provided in a report are requested instead of raw data

Samples: • 1 bag ca. 6kg homogenised cement • 4 bags of CEN standardised sand • 3 cured standard mortar specimens with predictable performance • 1 bag of similarly graded aggregates for sieveing analysis • 1 set of instructions and relevant EN standards provided by the German standardisation body (DIN)




Outline of Tests Mandatory Test item Specification 2013 2014

Loss on Ignition EN 196-2:2013 X X

Insoluble residue EN 196-2:2013 X X

Chloride content EN 196-2:2013 X X

Sulphate content EN 196-2:2013 X X

Specific surface (Blaine) EN 196-6:2010 X X

Standard consistence EN 196-3:2005 X X

Initial and final setting time EN 196-3:2005 X X

2 + 28 days flex. strength EN 196-1:2010 X X

2 + 28 days compr. strength EN 196-1:2010 X X

Sand + aggregate sieving EN 933-1:2012 - X

Optional Test item Specification 2013 2014

Soundness EN 196-3:2005 X X

7 days flexural strength EN 196-1:2010 X X

7 days compressive strength EN 196-1:2010 X X

• Identical controlled production • Curing for 28 d • Drying at 23 °C / 65 RH • Drying at 40 °C before sealing. • Testing at identical age




Technical Procedure in 2014/2015 • Data Analysis

• Anonymous report

• Self-assessment number

• Certificate




Analysis of Results from 2014/2015

• Standard statistics

• Outliers

• Frequency distributions

• Mean value and standard deviations

• 95% confidence intervals

• Coefficient of variation

• Comparison to BAM reference results

• Comparison between results fully and not fully complying with standards

• Laboratory equipment/performance




Overall Comparison of Results from 2013 and 2014




Results from 2014/2015








95% Confidence interval

Outlier

Indicator for equipment

Indicator for handing

Mean value

Sup

pl.

Pri

sms

Flex

ura

l Str

engt

h –

BA

M P

rep

arat

ion

28d Flexural strength – Individual Preparation

Flexural Strength





Sup

pl.

Pri

sms

Co

mp

ress

ive

Stre

ngt

h–

BA

M P

rep

arat

ion

28d Compressive Strength – Individual Preparation

Compressive Strength

Outlier

Indicator for equipment

Indicator for handing

Mean value

Comparison with results from 2013




Laboratory Capacities




African-based Laboratory Statistics

2014/2015 2012/2013

Total overall results from Africa-based laboratories 28 93% 20 91%

Number of laboratories in which all 17 tests (except particle size distribution - PSD) were conducted

5 18% 3 15%

Number of laboratories in which PSD was conducted

20 71% - -

Number of laboratories, where equipment for at least one of the tests is missing

23 82% 11 55%

Number of laboratories, where equipment is available but tests cannot be conducted fully according to standards (modules/temperature)

16 57% 8 40%

Number of laboratories, where the testing was conducted fully according to the standards

12 43% 14 70%

→ of which some tests were missing 10 36% 6 30%

→ of which all 17 tests were conducted entirely 2 7% 3 15%

→ of which are public laboratories 2 7% 2 10%


24

Consistency, Progression and Improvement

Ideal Objectives of the PACE-PTS • Networking with peers

• Training and improved knowledge of proficiency

testing in general as well as various testing procedures

• Dissemination of results and/or tests conducted

• Generating a sustainable own PT scheme suitable for all testing facilities in Africa

• Creating an Africa-wide network




Successes • Participation in PT is mandatory for accredited laboratories according to

ISO/IEC 17025:2005

• Participants have a realistic picture of where they perform well and where they need to improve performance

• The benchmark gives an overall picture of the capacity of the laboratories in comparison to their peers

• As a result of PT scheme in 2012/2013, 3 laboratories sought the need, and hence purchased required testing equipments





27

Conclusions

Conclusions and Future Considerations • An all Africa-wide cement PT scheme is fitting in with the technological

demands of the African cement market • PACE-PTS started in 2012 and continued in 2014 with a possible followup.

However, the aim is to make the scheme self sustainable in the long-term

• Previous PT scheme detected a number of challenges, mainly based on the lack of equipment for testing or funds to maintain equipment

• In order to cope with the challenges of the cement market in Africa, it is the responsibility of all official bodies to invest in quality control of product and infrastructure; financial support in public laboratories is significant



Conclusions


29

Further Activities


30

KEYS – Knowledge Exchange for Young Scientists

1st Symposium: Raw Materials, Quality Control

and Maintenance of Cementitious Products Venue: Dar es Salaam,

Tanzania Dates: June 8-12, 2015

2nd Symposium, Sustainable Cement and Concrete

Construction, 2016, Ghana

3rd Symposium, Applicable Cement and Concrete Technology in Africa, 2017, South

Africa

2 steps to meet international students and experts! Take your chance! 1. Submit an abstract on your research 2. Authors of the best abstracts* will be

sponsored with a return flight and full board accommodation to participate in the symposium.

*18 African and 4 German students can join the conference. Participation is open for young academics from entire Africa and from Germany. The participation of female researchers is encouraged.

International Keynote Speakers: Prof. Angel Palomo, Spain Mr. Boudewijn Piscaer, Netherlands Prof. Herbert Uzoegbo, South Africa Prof. Karen Scrivener, Switzerland Prof. Raissa Ferron, USA Dr. Shady Nabil, Egypt Mr. Walther Wirth, South Africa Dr. Dipl.-Ing. Wolfram Schmidt, Germany

Funding body: Organised by:


31

ACCTA 2016

International Conference on Advances in Cement and Concrete Technology in Africa 27th – 29th January 2016 Emperor’s Palace, Johannesburg South Africa

Website: www.accta2016.com Email: [email protected]

http://www.accta2016.com

mailto:[email protected]


32

Asanteni sana

Contact: Nsesheye Susan Msinjili

[email protected]

mailto:[email protected]

Improving Laboratory Performance through Cement Testing › wp-content › uploads › 2015 › 11...

Documents

Transcript of Improving Laboratory Performance through Cement Testing › wp-content › uploads › 2015 › 11...