Comformity assessment OPC 42N to CEM I EN 197_1.pdf

7/29/2019 Comformity assessment OPC 42N to CEM I EN 197_1.pdf

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Conformity elaborate for OPC 42.5N to the requirements of CEM I42.5N

Prepared by:Eng. Ratkovic Predrag LCC, Quality manager, LCC, August 2013

Introduction

This elaborate presents model for conformity valuation of cement type OPC 42.5 (Ordinary Portland Cement according toLibyan Standard Specification LSS 340/2009) to quality demand for CEM I 42.5N (Portland Cement according toEuropean norm EN 197-1).

Conformity evaluation model is presented in the table below. This model has 5 steps and is based on the continualsampling using spot samples and test results obtained on all auto control samples taken during the control period.Practically, it has three criteria based on characteristic values given as General criteria.

Conformity of cement with the requirements for mechanical, physical and chemical properties in EN 197-1 is assumed ifthe conformity of all three criteria are met. Cement period for assessment is 12 months with at least 1 sample per week for

continual production of same type.


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CEM I 42.5N Conformity assessment

Step 1. Test data collection and basic statistical calculation:

DatePeriod 12months

EarlyCompressive

strength2 days

StandardCompressive

strength28 days

Initialsettingtime

Soundness(expansion)

Loss onIgnition

Insolubleresidue

SO3 Cl-

MPa MPa (min) (mm) (%) (%) (%) (%)

Date1 Value 1 Value 1 Value 1 Value 1 Value 1 Value 1 Value 1 Value 1

Date 2 Value 2 Value 2 Value 2 Value 2 Value 2 Value 2 Value 2 Value 2

Number ofsamples

n ==COUNT()

Averagevalue

Xavg ==AVERAGE()

Standarddeviation

S =

=STDEV()

Step 2. General Statistical parameters (taken form EN 197-1)

Table 7. Acceptable number(if n


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Step 3. Criteria 1 and 2 Conformity assessment for cement type CEM I 42.5N

CEM I 42.5NProperty

EarlyCompressive

strength2 days

StandardCompressive

strength28 days

Initialsettingtime


Losson

Ignition

Insolubleresidue

SO3 Cl-

General

Statistical

parameters Limits (L=lower, U= Upper) L (min) L (min) U (max) L (min) U (max)

U(max)

U (max) U (max) U (max)

Percentile Pk = 5% 10%

Allowable probability ofacceptance

CR = 5%

Criteria1

Va

riable

Test type Variables Attributes

Limits (L=lower, U= Upper) L=10.0 L=42.5 U=62.5 L=60 U=10 U=5.0 U=5.0 U=3.5 U=0.10

Acceptability constant Ka = From Table 6 From Table 6

Upper limit Xavg + Ka x S= ---- ---- Calculate ----

Lower limit Xavg Ka x S = Calculate Calculate ---- ----

Xavg + Ka x S U Test ---- ---- ---- ----

Xavg Ka x S L Test Test Y/N Test Y/N Test Y/N ----

Criteria1

Attributes

Acceptable number(if n 10

countif > 5.0

countif > 5.0

countif > 3.5

countif > 0.10

Test (If Cd Ca than Y) = ---- Test Y/N Test Y/N Test Y/N Test Y/N Test Y/N Test Y/N

Criteria2

Limits for single value = 8.0 40.0 ---- 50 10 ---- ---- 4.0 0.1

Values out of range Vout=countif < 8.0

countif 10

---- ----countif > 4.0

countif > 0.10

Test (If Vout> 0 than N) = Test Y/N Test Y/N ---- Test Y/N Test Y/N ---- ---- Test Y/N Test Y/N


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Step 4. Conformity criteria for cement composition

OPC I 42.5N cement is cement made of 100% Clinker and 0% additives with addition of Gypsum assetting time regulator. Therefore Cement composition criteria is fill full.

Step 5, Final Conclusion on conformity assessment

If the criteria 1 and 2 in step 3 are met considering that criteria 3 in step 4 is already met, then cementtype OPC I 42.5N has pass conformity assessment for quality CEM I 42.5N according to norm EN 197-1.

Example of conformity test for CEM I 42.5N cement type:

Data table with basic statistic calculation (example)

Date

Period 12months

EarlyCompressive

strength2 days

StandardCompressive

strength28 days

Initialsettingtime


Loss onIgnition

Insolubleresidue

SO3 Cl-

MPa MPa (min) (mm) (%) (%) (%) (%)

Date1 Value 1 Value 1 Value 1 Value 1 Value 1 Value 1 Value 1 Value 1

Date 2 Value 2 Value 2 Value 2 Value 2 Value 2 Value 2 Value 2 Value 2


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Table for conformity assessment

CEM I 42.5NProperty

EarlyCompressive

strength2 days

StandardCompressive

strength28 days

Initialsettingtime


Loss onIgnition

Insolubleresidue

SO3 Cl-

General

Statistic

al

parameters Limits (L=lower, U= Upper) L (min) L (min) U (max) L (min) U (max) U (max) U (max)

U

(max)

U (max)

Percentile Pk = 5% 10%

Allowable probability ofacceptance

CR = 5%

Criteria1

Variable

Test type Variables Attributes

Limits (L=lower, U= Upper) L=10.0 L=42.5 U=62.5 L=60 U=10 U=5.0 U=5.0 U=3.5 U=0.10

Acceptability constant Ka = 1.53 (for n=147) 1.53 (for n=147)

Upper limit Xavg + Ka x S= ---- ---- 53.6 ----

Lower limit Xavg Ka x S = 16.9 43.7 ---- ----

Xavg + Ka x S U Test ---- ----Y,

53.610.0

Y,

43.7>42.5---- ----

Criteria1

Attributes

Acceptable number(if n 0 than N) = Y Y ---- Y Y ---- ---- Y Y

Conclusion on experimental data given in example

Criteria 1 (variables and attributes) and criteria 2 passed all conformity test (Y), therefore conformity has been met and tested cement for testingperiod fill full conformity requirements for CEM I 42.5N En 197-1.

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Comformity assessment OPC 42N to CEM I EN 197_1.pdf