An Aggregate Base Testing Technician is an individual who has demonstrated the knowledge and ability to properly perform, record, and report the results of basic field and laboratory procedures for aggregates and soils.
Scope and Knowledge:
The program requires a working knowledge of the following AASHTO and/or ASTM standards:
- T2–91—Sampling Aggregates
- T248–11—Reducing Samples of Aggregate to Testing Size
C702–98—Reducing Samples of Aggregate to Testing Size
- R58*—Dry Preparation of Disturbed Soil and Soil-Aggregate Samples for Test
D421*—Dry Preparation of Disturbed Soil and Soil-Aggregate Samples for Test
- T89–13—Determining the Liquid Limits of Soils
D4318—Determining the Liquid Limits of Soils
- T90–00—Determining the Plastic Limit and Plasticity Index of Soils
D4318—Determining the Plastic Limit and Plasticity Index of Soils
- T88–13—Particle Size Analysis of Soils
D422—Particle Size Analysis of Soils
- T265–12—Laboratory Determination of Moisture Content of Soils
D2216—Laboratory Determination of Moisture Content of Soils
- T180–10—Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop
D1557—Moisture-Density Relations of Soils Using a 4.54-kg (10-lb) Rammer and a 457-mm (18-in.) Drop
- T99–10—Moisture-Density Relations of Soils Using a 2.5-kg (5.5-lb) Rammer and a 305-mm (12-in.) Drop
D698—Moisture-Density Relations of Soils Using a 2.5-kg (5.5-lb) Rammer and a 305-mm (12-in.) Drop
*Written exam only
ACI will grant certification only to those applicants who meet both of the following requirements:
- A passing grade on the ACI written examination, and
- Successful completion of the ACI performance examination.
The two-hour written examination is open-book and consists of approximately 100 multiple-choice questions. There are eight to 12 questions on each of the standards.
To pass the written examination, both of the following conditions must be met:
- At least 60% correct for each of the required standards, and
- A minimum score of 70% overall.
The performance examination is closed-book and requires actual demonstration of the required standards. The examinee is judged on his/her ability to correctly perform or describe all of the required procedures for each standard.
Recertification is necessary every five years and requires successful completion of both the written and performance examinations.