Concrete Testing

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WHY Test Concrete?

Concrete testing is carried out for many reasons:
  • Evaluation new materials or products
  • Check compliance before, during or after construction
  • Assess condition for change of use or service life prediction
  • Failure investigation

WHAT Can Be Tested?

Concrete testing means more than cubes or cores:
  • Component materials; cement, pfa, ggbs, admixtures, coarse and fine aggregates, fibres, reinforcement, water
  • Fresh Concrete, mortar and grout
  • Hardened Concrete; cast specimens : cubes , cylinders, prisms
  • Existing structures; drilled core or dust samples, sawn specimens, insitu non-destructive testing of structural members

WHICH Tests?

Concrete testing is loosely covered by four main headings:
  • Physical/Mechanical
    • Workability/Consistency
    • Compressive/flexural/tensile strength
    • Modulus of elasticity
    • Density/water absorption/permeability
    • Moisture/thermal movement
  • Chemical
    • Composition (cement content, w/c ratio)
    • Presence of contaminants, eg chlorides
  • Visual and Microscopical Examination
    • Identification of components
    • Identification of deterioration processes
  • Durability
    • Soundness
    • Bond strength/adhesion
    • Cover to reinforcing steel
    • Carbonation depth

WHO should test?

Concrete testing is best carried out by someone that is:
  • Experienced in planning, concrete testing and interpretation of test data
  • Independent to avoid bias (no matter how unintentional)
  • Accredited for a wide range of tests

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