Serving Maine, New Hampshire, Massachusetts, Connecticut, Rhode Island, & Vermont

Materials Testing Services

R. W. Gillespie & Associates, Inc. is committed to improving the quality of life in our communities through the built environment. Through our materials testing and inspection services, we help clients reduce the potential for defects, delays and unanticipated costs, and help deliver projects of higher quality, better value and less risk.

In the Field

Field services before, during or after construction include:

  • Density testing of soils and pavement materials
  • Concrete composition analysis (air content, strength, unit weight, and temperature)
  • Pile load testing
  • Proof and performance testing of ground anchors
  • Vibration monitoring, and evaluation of control blasting measures
  • Crane platform plate load tests

We are prequalified by the Maine Department of Transportation in the following areas:

  • Highway Inspection, Construction Management, and Support Services
  • Bridge Construction Inspection, Construction Management, and Support
  • Marine Facilities Inspection
  • Rail Facilities Inspection
  • Aviation Facilities Inspection
  • Building Inspection
  • Fabrication Inspection
  • Materials Testing/Inspection
  • Geotechnical Construction Inspection

Special Inspections

Our company can provide structural compliance inspections to verify that the structural components of your project are constructed in accordance with the project plans and specifications.

  • Standard reinforced cast-in-place concrete
  • Pre-stressed and post-tension concrete structures
  • Reinforced masonry
  • Light- and heavy-gauge structural steel construction materials
  • Fireproofing of structural components
  • Portland cement concrete inspection
  • Portland cement concrete plant monitoring
  • Hot mix asphalt inspection
  • Hot mix asphalt plant inspection
  • Relative Humidity Testing

Construction Observation

Construction observation helps verify that projects are constructed as the designer intended and documents the work, materials, construction practices, and as-built conditions that testing alone cannot provide.

  • Earth fill placement and compaction
  • Lightweight fills (geofoam, cellular concrete, stone)
  • Rock fill placement and compaction
  • Mechanically stabilized earth walls and slopes
  • Boulder retaining walls
  • Soil and rock anchor installations
  • Pile driving
  • Compaction test strips
  • Settlement and vibration monitoring
  • Slope inclinometers installation and monitoring
  • Stone mattresses and culverts

In the Laboratory

We maintain our own certified testing laboratory for testing soils, rock, aggregate, concrete, and asphalt. We can also help establish construction specifications for the related areas based on our test results and analysis. Some of the over 40 tests we provide are:

  • Compressive and tensile strength of concrete, mortar, and grout cylinders
  • Marshall flow, stability, and component percentages of asphaltic concrete
  • Moisture-density relationships (standard and modified Proctor)
  • California Bearing Ratio
  • Sieve analysis
  • Atterberg Limits
  • Permeability
  • Specific gravity, absorption, freeze-thaw, and sulfate soundness
  • Theoretical maximum density

Code Compliance

We have developed an extensive working knowledge utilizing the following Code standards in both Compliance Inspections and development of Construction Specifications.

  • International Building Code
  • Department of Defense Unified Facilities Criteria
  • American Concrete Institute Building Code
  • Concrete Reinforcing Steel-Institute Standard
  • Portland Cement Association Masonry Handbook
  • American Society for Testing and Materials (ASTM)
  • American Association of State Highway and Transportation Officials (AASHTO)
  • Maine State Building Code
  • New Hampshire State Building Code
  • Massachusetts State Building Code
  • Rhode Island State Building Code
  • Vermont Fire & Building Safety Code

Environmental Quality

Staff environmental experts provide monitoring services regarding environmental quality protection. For numerous projects - such as wetland replication, wastewater disposal, or construction in sensitive areas - observation and analysis are essential to ensure consistency with environmental protection requirements and may be required for groundwater discharge and other permits.