L&G Engineering Laboratory's Engineers and staff are Pre-certified by the Texas Department of Transportation & Certified by the American Concrete Institute to perform work in several different categories such as Asphaltic Concrete (Hot-Mix Asphalt) and Portland Cement Concrete (Ready-Mix Concrete).
Portland Cement Concrete and Raw Material Sampling and Testing is performed in accordance with the TXDOT's Manual of Testing Procedures and the American Concrete Institute procedures. All Sampling and Testing will be performed by experienced ACI- Field Grade I Certified Personnel. The technician will review & record batch weights and determine compliance with approved Concrete Mix Design & applicable tolerances. Sampling and Testing will be performed at specified intervals (Samples will be obtained and Tested for Slump, Air Content, Temperature and if required, Uniformity, Compressive / Flexural Strength) In addition, the technician will provide a visual inspection of the production plant to ensure that all equipment meets project specifications (chemical admix burettes, aggregate stock piles, truck mixers).
Texas Department of Transportation Test Procedures
- Tex-417-A "Unit Weight, Yield, Air Content of Concrete"
- Tex-409-A "Free Moisture & Water Absorption in Aggregates"
- Tex-422-A "Measuring Temperature of Freshly Mixed Concrete"
- Tex-415-A "Slump of Portland Cement Concrete"
- Tex-416-A "Air Content of Concrete by the Pressure Method"
- Tex-447-A "Making and Curing Concrete Test Specimens"
- Tex-418-A "Compressive Strength of Cylindrical Specimens"
- Tex-424-A "Obtaining and Testing Drilled Cores of Concrete"
- Tex-472-A "Uniformity of Concrete"
American Concrete Institute Test Procedures
- ASTM C1064 "Temperature of Freshly Mixed Hydraulic-Cement Concrete"
- ASTM C172 "Sampling Freshly Mixed Concrete"
- ASTM C143 "Slump of Hydraulic-Cement Concrete"
- ASTM C138 "Unit Weight, Yield, and Air Content (Gravimetric) of Concrete"
- ASTM C231 "Air Content of Freshly Mixed Concrete by the Pressure Method"
- ASTM C173 "Air Content of Freshly Mixed Concrete by the Volumetric Method"
- ASTM C31 "Making and Curing Concrete Test Specimens in the Field"
Certifications: American Concrete Institute
- Concrete Testing Field Technician Grade I
- Aggregate Testing Technician Level I
Hot Mix Asphalt / Raw Material Sampling and Testing performed in accordance with the Department's Manual of Testing Procedures & the American Society for Testing & Materials. All Sampling and Testing will be performed by Experienced TAPA Level 1-A Certified Personnel. Sampling and Testing will be performed at specified intervals based on project specifications (Lots, Sub-Lots, Small Quantities.) The technician will record production test results as obtained on TxDOT or other approved forms (Spreadsheets and Control Charts). The results of on-going production testing will be reviewed for compliance with project plans, specifications and design / operational tolerances. In addition, the technician will provide a visual inspection of the production facilities to include the verification of plant temperatures and stock pile contamination.
Texas Department of Transportation Test Procedures
- Tex-222-F Sampling Bituminous Mixtures
- Tex-200-F Sieve Analysis of Fine and Coarse Aggregates
- Tex-206-F Compacting Specimens of Bituminous Mixtures
- Tex-207-F Determining Density of Compacted Bituminous Mixtures
- Tex 227-F Theoretical Specific Gravity of Bituminous Mixtures
- Tex 236-F Determining Asphalt Content by the Ignition Method
- Tex 423-A Determining Pavement Thickness by Direct Measurement
American Society for Testing & Materials
- ASTM D6926 "Standard Practice for Preparation of Bituminous Specimens Using Marshall Apparatusa"
- ASTM D6927 "Standard Test Method for Marshal Stability & Flow of Bituminous Mixtures"
Certifications: Texas Hot Mix Asphalt Pavement Association
- Hot Mix Asphalt Plant Production Specialist Level IA
- Hot Mix Asphalt Roadway Specialist Level IB
- Hot Mix Asphalt Mix Design Specialist Level II
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