Douglas Partners testing laboratories provide construction materials testing for industrial, commercial and residential subdivisions, mines and associated infrastructure, roads, pipe lines, quarries, railways, bridges, tunnels and dams.

We conduct and maintain quality assurance testing of aggregates, soils and concrete during the construction of major infrastructure projects and for routine small civil projects. Our laboratories are staffed with highly qualified technicians who work with our clients to provide unique and innovative solutions that are technically easy to understand and practical to implement. We take great pride in our work and focus on exceeding client expectations. 

We promote an enjoyable and stimulating work environment with an absolute commitment to safety. Our staff development sets us apart with all technicians undertaking on-going training programs that include completing internal or nationally recognised external courses. Our laboratories are NATA accredited and comply with current Australian Standards and International Standards such as British Standards (BS), American Society of Testing and Materials (ASTM), and various State & Territory test methods. 



Fast turnaround and accurate test results


Reliable service and easy to work with


Conduct our business with integrity and in compliance with our accreditation body


Comprehensive range of construction materials testing including soils, rocks, aggregates & concrete


Fully integrated LIMS software that allows clients to access their test reports on-line


Tender preparation service


Full geotechnical and environmental engineering support

Level 1 & Level 2

Compaction Testing and Inspection

Douglas Partners offers comprehensive compaction testing services during construction to verify that the soil has been compacted in accordance with the specification

Our services are tailored to meet the needs of all sectors and industries, ranging from state and local government projects to property developers, small businesses, and individuals. No matter the scale or complexity, we approach each project strategically, aligning our work seamlessly to meet your objectives.

Level 1 Testing & Inspection in accordance with AS3798
Level 2 Compaction Testing
Monitoring of earthworks and suitability of materials during the construction phase
Laboratory Compaction Tests
  • Standard Compaction
  • Modified Compaction
  • Maximum / Minimum Density Index (Cohesionless Material)
Field Density Tests
  • Nuclear Gauge Method
  • Sand Replacement Method

Soil testing

Douglas Partners offers a comprehensive range of professional soil testing services with expertise that spans from CBR testing for precise pavement thickness designs, to specialised analyses. Our soil classification testing ensures robust and reliable foundation design for residential, commercial, and industrial developments.

With a dedication to excellence, we continuously expand our service offerings to meet and exceed your project requirements. Our expert team leads with integrity and thoroughness in soil testing, providing the knowledge and confidence for your project success.

Services offered include:

  • Atterberg Limits
  • Linear Shrinkage
  • Moisture Content
  • Shrink Swell Index
  • Sieve Analysis
  • Hydrometer Test
  • Foreign Materials
  • Triaxial Permeability
  • Constant & Falling Head Permeability
  • Emerson Class Number
  • Pinhole Dispersion
  • California Bearing Ratio (CBR)
  • Insitu CBR
  • Unconfined Compressive Strength (UCS)
  • Unconsolidated Undrained (UU) Triaxial Compression
  • Consolidated Undrained (CU) Triaxial Compression
  • Consolidated drained (CD) Triaxial Compression
  • Direct Shear
  • Hand Vane Shear
  • One dimensional consolidation

Aggregate testing

Douglas Partners provides comprehensive aggregate testing services to ensure the highest level of quality assurance. With precision and attention to detail, we leave no aspect of aggregate testing unexplored.

Our testing methodologies encompass a wide array of factors, from size, shape, durability, and strength to density and specialised chemical analysis. By utilising advanced techniques, we uncover valuable insights into the characteristics and performance of aggregates, ensuring your projects are built on a solid foundation of superior materials. 

Services offered include:

  • Sampling
  • Sieve Analysis
  • Average Least Dimension
  • Clay & Fine Silt Content
  • Flakiness Index
  • Fractured Faces
  • Friable Particles
  • Los Angeles Abrasion Value
  • Material Finer than 75µm
  • Maximum Dry Compressive Strength
  • Organic Impurities Other than Sugar
  • Particle Shape (proportional caliper)
  • Particle Density and Water Absorption
  • Sodium Sulfate Soundness
  • Weak Particles
  • Organic Impurities Other than Sugar
  • Unit Mass (loose + compacted)
  • Bulk Density
  • Wet / Dry Strength Variation
  • Aggregate Crushing Value
  • Slake Durability

Concrete testing

Douglas Partners offers a wide range of concrete testing services that cater to a multitude of critical applications, from pavements and bridges to drainage culverts, industrial, commercial, and residential buildings, precast facilities, retaining walls, and driveways. 

Our expertise goes beyond standard testing, as we also excel in crafting concrete mix designs tailored to the specific needs of individual organisations or larger national companies. With our comprehensive solutions, your concrete projects will not only meet but exceed expectations, ensuring durability, safety, and success.

Services offered include:

  • Sampling
  • Compressive Strength
  • Slump
  • Mass Per Unit Volume of wet & hardened concrete
  • Trial Mixes for road construction, bridges & N Class
  • Mass Per Unit Volume
  • Bleed of Concrete
  • Grout Testing
  • Brazil Splitting
  • Flexural Strength
  • Drying Shrinkage
  • Compressive Strength of Concrete Cores
  • Slump Flow for Self Consolidating Concrete

Rock testing

Douglas Partners can deliver expert rock testing services that are paramount in establishing the strength and durability of rock materials, laying the foundation for setting precise design parameters for any development.

With our testing techniques, we delve deep into the properties of rocks, unravelling critical insights that empower you to make informed decisions and achieve unparalleled project success. 

Services offered include:

  • Young’s Modulus
  • Poisson’s Ratio
  • Unconfined Compressive Strength
  • Point Load Strength Index
  • Strength Testing
  • Brazil Splitting
  • Slake Durability
  • Moisture Content
  • Resistance to Salt Attack

Penetration &
Deflection testing

Douglas Partners specialises in conducting advanced penetration and deflection testing. Our proficiency in determining precise bearing capacity for footing designs and crane pads, combined with meticulous deflection testing of road pavements, lays the foundation for structural integrity and performance.

Utilising the test data we provide, you gain critical insights into the engineering properties of your project, both before and after construction. These insights empower you to make informed decisions, ensuring that your development not only meets but surpasses rigorous specification requirements.

Services offered include:

  • Dynamic Cone Penetrometer
  • Perth Sand Penetrometer
  • Benkelman Beam Deflection