Materials Inspection

Asphalt Concrete

Asphalt Concrete is inspected during production. Inspectors are well equipped with sieves, a balance, and other tools to run tests at the plant and make mix design modifications to assure specification compliance. Asphalt mix designs are approved at the Lab prior to shipping.

Portland Cement Concrete

Portland Cement Concrete is inspected during production. Inspectors check weighing of aggregates, cement, water, and admixtures to insure compliance with previously approved mix design. Inspectors also obtain samples of aggregate to be transported to the Materials Lab for testing. Concrete mix designs are approved at the Lab prior to shipping. Technicians will also perform "slump" tests and fabricate concrete cylinders for strength tests.

Rock Slope Protection

Inspectors are qualified to inspect Rip-Rap at the jobsite as well as at the source.

Aggregate Base

Inspectors are equipped with a set of sieves to perform sieve analysis of aggregate base on the grade or at the manufacturing plant. Samples are obtained and transported to the Materials Lab for further testing.

Sampling Aggregate at a Concrete Plant

Sampling Aggregate at a Concrete Plant

Prefabricated Concrete Products

  • Reinforced Concrete Pipe Inspectors visually inspect RCP at the manufacturing plant for "Greenbook" compliance as well as witness D-Load testing of individual pipes.
  • Prestressed Concrete Products Inspectors check forms, observe pre-stressing, inspect concrete and fabricate concrete cylinders to be transported to the Lab.

Material Stabilization

Cement Treated Base - The purpose of Cement Treated Base is to recycle crushed pavement and treat with cement and water to produce a firm and unyielding base material with a high gravel equivalent. Field inspection of Cement Treated Base is achieved with a crew of 1 or 2 technicians and 1 inspector. The crew performs compaction tests and "squeeze" tests for quality control of this process.

Fabricated Concrete Structure

Fabricated Concrete Structure

  • Soil Cement This material is used mainly for slope protection. The stabilization contractor assembles an onsite plant to manufacture soil cement. Inspection is similar to Cement Treated Base.
  • Lime Treated Soil This process treats clayey soil with calcium oxide to stabilize the soil and therefore increase the R-Value. Inspection of this material usually involves one inspector.