Interlaboratory technical project МС 09/2025 (Ongoing)

Interlaboratory Technical Project МС 09/2025 (Ongoing)

Dear Colleagues,

PT provider UCLSB invites you to take part in Interlaboratory Technical Project MC 09/2025. Test subjects will be: (Construction) Soils, according to the standards and indicators specified in the following table:

Test subject	Code of the standard	Name of the standard	Type/characteristic of test	Range of expected values
(Construction) Soils or Unfractionated Aggregate 0-16	EN 13286-2, clause 7.1	Unbound and hydraulically bound mixtures - Part 2: Test methods for laboratory reference density and water content - Proctor compaction EN 13286-2, clause 7.1	Laboratory reference density and water content - Proctor compaction Maximum dry density	1,60 -1,90 Мg/m3
	EN 13286-2, clause 7.1	Unbound and hydraulically bound mixtures - Part 2: Test methods for laboratory reference density and water content - Proctor compaction EN 13286-2, clause 7.1	Laboratory reference density and water content - Proctor compaction Optimum water content	5 -20 %
	EN 13286-47	Unbound and hydraulically bound mixtures - Part 47: Test method for the determination of California bearing ratio, immediate bearing index and linear swelling.	California bearing ratio /CBR/	20 - 50 %

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Additional information regarding Interlaboratory Technical Project (ITP) MC 09/2025.

Deadline for accepting applications for participation: 10.10.2025;

• Sending the samples to the participants: by 31.11.2025 at the latest;

• Preparation of the final report: no later than 20.01.2026;

Detailed information will be given in the instruction for conducting the interlaboratory comparison and proficiency test. You will be informed about all other changes that may be imposed during the course of MC 09/2025 by e-mail.

Please, in case you have any questions, do not hesitate to contact us via e-mails sslsb@abv.bg or sslsb@yahoo.com!

*The date which is pointed as a beginning of the relevant project is the date when acceptance of the applications starts.

** Requests for the relevant project, in English and Bulgarian, can be found in the "PT schemes" section of our website: https://ptprovider.sslsb.org/

*** The end of the relevant project means that this is the deadline for the report to be prepared in case nothing else is stated in the instruction form.

Note : All participants will receive further instructions for the process of implementing the relevant PT scheme. The minimum number of participants for a parameter to be included in the relevant PT scheme is 5.

Application form

Name of the laboratory

Number of the certificate for accreditation

Don't fill it out ^*

Manager of the laboratory

Contact person

Country/Town

Pot code

Address

Phone

Fax

E-mail

Name of the entity

Adress

National Statistic Number

Vat Registration Number

Person who will receive the invoice

Address for delivering of the invoice

EN 13286-2, clause 7.1 Unbound and hydraulically bound mixtures - Part 2: Test methods for laboratory reference density and water content - Proctor compaction EN 13286-2, clause 7.1

EN 13286-47 Unbound and hydraulically bound mixtures - Part 47: Test method for the determination of California bearing ratio, immediate bearing index and linear swelling.

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