Proficiency Testing № PTS 22/02

Dear colleagues,

It is our pleasure to invite you to take part in proficiency testing № PTS 21/07 by means of an interlaboratory comparison.

The subject of testing will be product “Coarse aggregate” under standard methods and parameters, pointed below.

The product and the parameters are under the scope of accreditation of PT Provider PTS Bulgaria at PTS Bulgaria Ltd.

You may find more details in the Detailed PT plan and the Invitation for participation in section “Documents for participation.

Subjects of the proficiency testing

Coarse aggregate

Testing

Code Name Characteristics

*EN 1097-1

Tests for mechanical and physical properties of aggregates - Part 1: Determination of the resistance to wear (micro-Deval)

Resistance to wear - micro Deval coefficient

*EN 1097-2, item 5

Tests for mechanical and physical properties of aggregates - Part 2: Methods for the determination of resistance to fragmentation

Resistance to fragmentation - Los Angeles coefficient

*EN 1097-6, Annex А, item А.4

Tests for mechanical and physical properties of aggregates - Part 6: Determination of particle density and water absorption

Pre-dried particle density, ρ

*EN 1367-2

Tests for thermal and weathering properties of aggregates - Part 2: Magnesium sulfate test

Magnesium sulfate value

*EN 206+A2/NA, Annex NA.Q (only for Bulgaria)

Determination of resistance to fragmentation of coarse aggregate by static loading

Resistance to fragmentation by static loading

*All tests will be carried out according to the last valid versions of the pointed standards!