Quality Control Technician (RM & Concrete Aggregates)

Job Summary

The Quality Control Lab Technician will perform quality control testing and reporting duties in the concrete and concrete aggregates testing laboratory. 


At CalPortland, we’re proud to offer a comprehensive, competitive benefits package that provides health and financial support to our most important resources: our employees. Your benefits are an important part of your overall compensation at CalPortland. That’s why we give you a wide range of benefits to choose from. All regular full-time employees may enroll in a variety of health and welfare plans including medical, dental, and vision plans. Other benefits include life insurance, disability coverage, employee assistance program, and retirement program. The company also has a variety of voluntary benefits for employees to choose from.


$22.50 - $25.50/ hr DOE


  • Perform all aspects of stripping, curing, capping, and compression testing in the concrete and concrete aggregates testing lab
  • Report concrete cylinder strength test results according to ACI standards
  • In-process aggregate test samples and split to smaller test size according to schedule
  • Testing to include moisture content, slump, density, air content, cylinders, etc.
  • Perform gradations tests on rock and sand samples along with additional tests such as cleanliness value, #200 wash, sand equivalency, specific gravities, and absorptions
  • Enter test results into a computer database and distribute reports to appropriate individuals
  • Gather cement, fly ash, and aggregate materials at production plants in preparation for concrete trial batch tests
  • Accurately weigh up each material as listed in the trial batch sheets and set up equipment for trial testing
  • Conduct scheduled calibrations on test equipment per calibration schedule
  • Always maintain work area and office equipment in a safe and clean condition 
  • Conduct production concrete testing with varying start times as needed
  • Troubleshoot job problems and handle job complaints (out-of-spec aggregates, low breaks, Schmidt hammer, cracking, coring)
  • Coordinate work with other regional management personnel, i.e. sales, operations, customer service, and dispatch.
  • Prepare job incident reports
  • Analyze aggregate and strength reports and identify trends
  • Work directly with customers
  • Attend pre-job meetings


  • High school diploma/GED
  • Related field experience or minimum of 3 years’ experience
  • ATTI and ACI Certified 


  • Related field experience or a minimum of 3 years’ experience
  • ATTI and ACI Certified
  • Job requires the following motions: climbing, stooping, bending, squatting, frequent lifting up to 75 pounds, occasional lifting of 100 pounds, stretching, sitting, walking on uneven ground and stairs  
  • May be exposed to extremes of hot or cold weather and be able to work in wet environments
  • Must be able to work flexible hours with varying start and stop times
  • Overtime work will be required as needed by the company
  • Must meet OSHA 10 guidelines and be able to follow all CalPortland Safety Policies
  • ANSI approved PPE will be provided and must be used when required
  • Must be able to speak, read and write in English
  • Must have a valid driver’s license and be insurable
  • Certifications in ACI Field Grade I, ACI Lab I & II, ACI Strength Testing, and ACI Aggregates Testing preferred; if no current certifications, you will be required to obtain ACI Aggregate and ACI Strength technician within 6 months of hire date and ACI Field Grade within 12 months of hire date
  • Lab Technician will be subject to random drug and alcohol screens as required by company

Intermediate skills in Microsoft Office Suite and SAP software

Conditions of Employment

Successful candidate must submit to post-offer pre-employment physical examination, drug/alcohol screen, and background check. Some positions require FMCSA regulated on-going drug and alcohol testing.


Irwindale, CA, US, 91706

Job Req ID:  11623
Job Type:  Hourly - Full-Time

Nearest Major Market: Los Angeles

Job Segment: Testing, QC, Lab Technician, Sales Operations, Construction, Technology, Quality, Healthcare, Sales, Engineering