Construction Materials Testing

Construction Materials Testing encompasses a range of different services, and essentially checks that the materials and construction practices used are in accordance with each project’s specifications. Giles Engineering professionals perform observation services, special inspections and third-party evaluations. Additionally, Giles Engineering Associates has their own full service materials testing laboratories.

Giles Engineering field and laboratory associates are highly skilled and trained professionals, holding certifications from ACI, AWS, ICC, NICET, PTI and various state DOT agencies. We also have overall laboratory certifications from outside accreditation agencies and state DOTs; the laboratory at our corporate headquarters has been accredited by AASHTO since 1997.

Services provided by our CMT divisions:



  • Base stone construction observation and testing
  • Deep foundation observation testing, including:
    • Auger-cast piles
    • Driven piles
    • Drilled piers (or cassions)
    • Helical piers
  • Density testing
  • Detention pond and Infiltration basin observation and testing
  • Fill and backfill construction observation and testing
  • Foundation soil observation and strength testing
  • Sample collection
  • Subgrade evaluations
  • Subgrade improvement observation and testing, including:
    • Lime, fly ash, or Portland cement stabilization
    • Stone column or rammed-aggregate piers
  • Test pit and hand-auger probe


  • Aggregate Quality Analysis
  • Alkali-Silica Reactivity testing of aggregate
  • Atterberg limits of soil
  • California bearing ratio (CBR) of soil
  • Classification of soil or aggregate
  • Clay lumps and friable particles in aggregate
  • Consolidation and swell of soils
  • Deleterious materials and lightweight pieces in aggregate
  • Direct shear and angle of internal friction of soil or aggregate
  • Electrical resistivity of soil or aggregate
  • Expansion Index of expansive soils
  • Fineness modulus of aggregate
  • Fractured face, and flat and elongated pieces of aggregate
  • Freeze-thaw of aggregate
  • Los Angeles abrasion of aggregate
  • Moisture-density relationship (Proctor testing) of soil or aggregate
  • Organic content of soil or aggregate
  • Particle size analysis and gradation of soil or aggregate
  • Permeability of soil or aggregate
  • pH testing of soil or aggregate
  • Soil-lime testing
    • CBR
    • Compressive and flexural strength
    • Freeze-thaw
    • Moisture-density
    • Optimum lime content for stabilization
    • Wet-Dry
  • Soundness of aggregate
  • Specific gravity, including absorption for aggregates
  • Triaxial testing (U-U, C-U, and C-D) of soil
  • Unconfined compression of soil
  • Unit weight of soil or aggregate



  • Air content and unit weight of concrete at placement
  • Cast-in-place pop-out cylinder (CIPPOC) installation and collection
  • Casting concrete, mortar and grout specimens
  • Concrete maturity readings
  • Concrete pH
  • Concrete placement observations (can include reinforcing steel)
  • Coring samples for testing
  • Floor flatness testing
  • In-place concrete Relative Humidity (RH) testing
    • Wagner or Vaisala test systems available
  • In-place concrete slab moisture vapor emission testing
  • In-place concrete strength by rebound hammer testing
  • In-place concrete strength by Windsor probe testing
  • In-place mortar strength by Windsor pin testing
  • Masonry construction observations (can include reinforcing steel)
  • Mortar aggregate ratio and air content testing
  • Observation of masonry prism sample fabrication
  • Radar imaging of concrete and masonry for detection of embedded items and voids
  • RILEM tube testing of masonry
  • Slump at placement for concrete and grout
  • Temperature at placement for concrete, mortar, and grout


  • Alkali-Silica Reactivity testing
  • Chloride permeability of concrete
  • CMU fire rating
  • Compressive strength of:
    • Brick
    • Brick prisms
    • CMU block
    • CMU prisms
    • Concrete
    • Grout
    • Mortar
    • Paver
  • Concrete core absorption
  • Concrete freeze-thaw testing
  • Concrete maturity curve development
  • Depth of carbonation (of concrete core)
  • Elastic Modulus and Poisson’s Ratio of concrete
  • Flexural testing of concrete
  • Masonry freeze-thaw testing
  • Moisture, unit weight, and absorption of:
    • Brick
    • CMU
    • Concrete
    • Paver
  • Shrinkage of concrete
  • Split tensile strength of concrete and mortar
  • Time of set testing of concrete
  • Water and acid soluble chloride content of concrete

STEEL: Structural, Reinforcing and Framing


  • Anchor bolt pull testing
  • Bolted connection observations and bolt torque testing
  • Bolt testing with Skidmore-Wilhelm apparatus
  • Cold-metal framing observations
  • Intumescent Paint thickness testing
  • Non-destructive weld testing
  • Reinforcing steel placement observations
  • Plumbness of steel columns
  • Post-tensioned steel placement observations
  • Post-tensioned steel stressing observations
  • Rebar location in previously cast concrete and masonry structures
  • Spray-applied fire resistant material testing
    • Thickness
    • Density sample collection
    • Cohesion-Adhesion
  • Visual weld observations


  • Density of spray-applied fire resistant material



  • Core collection
  • In-place asphalt density testing
  • Pavement construction observations
  • Sample collection


  • Asphalt content by extraction
  • Bulk specific gravity and density
  • Core thickness
  • Gradation of extracted aggregate
  • Marshall stability and flow
  • Maximum specific gravity

Specialty Services


  • Crack and damage survey
    • Pre- and Post-Construction
  • Crack monitoring
  • Infrared camera imaging
  • Portable Impact Echo
  • Radar imaging of concrete and masonry
  • Rebar corrosion mapping
  • Vibration survey and vibration monitoring
  • Waterproofing application observations
  • Wood framing observations
Want to work for an industry leader?

We’re growing and hiring:

Learn More About UsCareer Opportunities