Certifications SOIL D421- Dry Preparation of Soil Samples for Analysis D422- Particle-Size Analysis of Soils D698- Standard Proctor D1557- Modified Proctor D1140- Analysis of Soils Finer than No. 200 (75-µm) Sieve D2166- Unconfined Compressive Strength Test of  Soil D2216- Determination of Moisture Content of Soil and Rock D2487- Classification of Soils for Engineering Purposes D2974- Moisture, Ash, & Organic Matter of Peat & Organic Soils D4318- Liquid Limit, Plastic Limit, and Plasticity Index of Soils D6938- Density Testing by Nuclear Gauge AGGREGATE C40- Organic Impurities in Fine Aggregates for Concrete C117- Analysis of Materials Finer than 75-µm (No. 200) Sieve C127- Specific Gravity of Coarse Aggregate C128- Specific Gravity of Fine Aggregate C136- Sieve Analysis of Fine and Coarse Aggregates C702- Reducing Samples of Aggregate to Testing Size CONCRETE C31- Making and Curing Concrete Test Specimens in the Field C39- Compressive Strength of Cylindrical Concrete Specimens C138- Density, Yield, and Air Content of Concrete C143- Slump of Hydraulic-Cement Concrete C172- Sampling Freshly Mixed Concrete C173- Air Content of Freshly Mixed Concrete by Volumetric Method C231- Air Content of Freshly Mixed Concrete by Pressure Method C470- Specifications for Cylinder Molds C511- Specifications for  Curing Rooms and Water Storage Tanks C617- Capping Cylindrical Concrete Specimens C1064- Taking Temperature of Freshly Concrete C1231- Unbonded Caps in Determination of Compressive Strength SPRAYED FIRE-RESISTIVE MATERIAL E605- Thickness and Density of Sprayed Fire-Resistive Material Applied to Structures E736- Cohesion and Adhesion of Sprayed Fire-Resistive Materials Applied to Structures Technician Certifications American Concrete Institute (ACI) Certified Concrete Field and Laboratory Testing Technicians Certified Aggregate Testing Technicians Certified Flatwork Inspection Technicians National Institute for Certifications in Engineering Technologies (NICET) Certified Soil, Aggregate and Concrete Technicians Post-Tensioning Institute Certified Field Fundamentals of Unbonded Post-tensioning Level I & II Associations American Society of Civil Engineers American Concrete Institute Post-Tensioning Institute Concrete and Aggregate Association of Louisiana Louisiana Ground Water Association (Licensed Driller)