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Youngdahl Consulting Group's laboratory can test to determine physical characteristics, indices, classifications, engineering properties of soil and rock, and construction materials such as concrete, aggregate, and asphalt. Our laboratory - DSA Approved (LEA No. 13), CCRL and AMRL assessed, and AASHTO accredited - uses computerized data acquisition systems to efficiently collect and reduce test data. These systems reduce the risk of operator or computational error and provide plots and tabulation of results for clients. Our fully trained laboratory staff is completely familiar with and performs their duties in accordance to industry standards such as ASTM, AASHTO, Caltrans, and U.S. Army Corps of Engineers. Our laboratory provides construction testing for:


  • Sieve Analysis
  • Hydrometer
  • Specific Gravity
  • Atterberg Limits
  • Moisture Content
  • Dry Unit Weight
  • Compaction (ASTM, AASHTO)
  • California Impact
  • Resistance (R) Value
  • Swell/Consolidation
  • Expansion Index
  • Unconfined Compression
  • Direct Shear
  • Triaxial Compression
  • Hydraulic Conductivity
  • Pinhole Dispersion
  • pH and Resistivity
  • Organic Content
  • Rock Shear
  • Redox Potential
  • Naturally Occurring Asbestos
  • ARB TM 435
  • EPA Method 600/R-93-116


  • Concrete Compression
  • Modulus of Rupture
  • Mortar and Grout Compression
  • Coring
  • Masonry Testing
  • Tensile and Bend Testing
  • Fireproofing


  • Sand Equivalent
  • Durability Index
  • Los Angeles Abrasion
  • Sulfate Soundness
  • Specific Gravity and Absorption
  • Cleanness Value
  • Crushed Particles
  • Organic Matter


  • Unit Weight
  • Maximum Theoretical Specific Gravity
  • Extraction/Gradation
  • Marshal Stability and Flow