VN Engineering Ltd.
Accredited construction testing laboratory
Field, laboratory and non-destructive testing of construction materials and structures, and inspection of buildings and structures.
The laboratory has been accredited by the Bulgarian Accreditation Service to БДС EN ISO/IEC 17025:2018 since 2014.
Scope of accreditation
Accredited laboratoryБДС EN ISO/IEC 17025:2018
- BAS registration No.
- 105 LI
- first accredited
- 2014
- methods in the accredited scope
- 96
- accreditation valid until
- 15.04.2030
01Laboratory
Testing
Field testing during construction, testing in the laboratory, and non-destructive testing of existing structures.
Field testing
- Subgrade bearing capacity by plate load test
- Compaction — core cutter or sand replacement
- In-situ California Bearing Ratio (CBR)
- Fresh concrete at the point of placement
Laboratory testing
- Strength, deformation and water tightness of hardened concrete
- Classification of soils and aggregates
- Density, voids and binder content of asphalt
- Strength and adhesion of mortars and adhesives
Non-destructive testing
- Concrete strength in existing structures
- Location and cover of reinforcement
- Corrosion potential of reinforcement
- Coating thickness on steel
02Laboratory
Structural inspection
To diagnose an existing structure correctly, we track changes in the geometry of its load-bearing elements and in the physical and mechanical properties of the materials they are made of.
The strength of reinforced-concrete elements is determined by non-destructive testing of the concrete with a rebound hammer, and the reinforcement is mapped with a cover meter. The degree of corrosion of the bars can also be measured. Where laboratory testing of the existing material is needed, cores are taken from the structure.
- checking the strength of concrete
- locating reinforcement in concrete and determining its characteristics
- assessing the corrosion potential of embedded reinforcement
- measuring the thickness of non-magnetic coatings on steel (fire-protective paints, primers, etc.)
- measuring the surface moisture of reinforced-concrete elements
03Laboratory
Accreditation
Accredited since 21.03.2014, re-accredited in 2026. Certificate No. 105 LI, valid until 15.04.2030.
- Issued by
- Executive Agency “Bulgarian Accreditation Service”
- Standard
- БДС EN ISO/IEC 17025:2018
- Order
- Order No. A 117/09.04.2026
- Valid until
- 15.04.2030
Testing of
- Aggregates for unbound and hydraulically bound mixtures; construction soils
- Fresh concrete; concrete
- Screed mortars
- Asphalt mixtures and laid and compacted asphalt layers
- Mortars
- Concrete in structures
- Tile adhesives
- Waterproofing
- Sprayed concrete
- Reinforced concrete structures
- Aggregates
- Anti-corrosion and fire-protective coatings, paints and varnishes on metals
The scope is reproduced verbatim from the certificate; the English is a translation.
04Laboratory