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Laboratory

Types of tests

The scope of the VN Engineering construction testing laboratory includes:

Plate load test — bearing capacity of the subgrade

01Laboratory

Field testing during construction

Measurements on site determine:

  1. 1.1bearing capacity and deformation properties of the subgrade by plate load test
  2. 1.2degree of compaction of fill layers by core cutter or sand replacement
  3. 1.3California Bearing Ratio (CBR) determined in situ
  4. 1.4fresh concrete at the point of placement (consistency, density, placing temperature, etc.)
  5. 1.5evenness and deflection of asphalt pavements
  6. 1.6strength and applied thickness of sprayed concrete
  7. 1.7bond of waterproofing and repair materials to the substrate
Field compaction test by sand replacement
fig. 1 — Field compaction test by sand replacementon site

02Laboratory

Laboratory testing

Testing in the laboratory includes:

  1. 2.1strength, deformation characteristics and water tightness of hardened concrete
  2. 2.2the full range of tests needed to classify construction soils and aggregates for fills, concrete and asphalt mixtures
  3. 2.3thickness, density and deformation characteristics of laid asphalt
  4. 2.4void and binder content of asphalt mixtures
  5. 2.5strength and adhesion of mortars and adhesives
Deformation properties of hardened concrete
fig. 2 — Deformation properties of hardened concreteControls

03Laboratory

Non-destructive testing of existing structures

Non-destructive testing of existing elements includes:

  1. 3.1checking the strength of concrete
  2. 3.2locating reinforcement in concrete and determining its characteristics
  3. 3.3assessing the corrosion potential of embedded reinforcement
  4. 3.4measuring the thickness of non-magnetic coatings on steel (fire-protective paints, primers, etc.)
  5. 3.5measuring the surface moisture of reinforced-concrete elements
Profometer — locating reinforcement in concrete
fig. 3 — Profometer — locating reinforcement in concreteProceq