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  • Transportation Materials Sampling

    HIGHWAY TECHNICIAN CERTIFICATION PROGRAM University of Wisconsin-Platteville 049 Ottensman Hall 1 University Plaza Platteville, WI 53818-3099 Office Phone: 608-342-1545 Fax: 608-342-1982


    The WisDOT Certified Aggregate Sampling Technician Course Manual was prepared and developed by the Highway Technician Certification Program staff at the University of Wisconsin-Platteville, the Highway Technician Certification Program instructors, and other contributors from WisDOT and the highway industry. The information contained in this course manual is intended to be used to train WisDOT personnel to conduct ONLY SAMPLING of aggregates on all types of WisDOT highway construction projects. The intent of this manual is to provide AASHTO-based training as it applies to aggregate sampling. It is the responsibility of the WisDOT Certified Aggregate Sampling Technician to follow all current WisDOT specification parameters and procedures when conducting work assignments for the Wisconsin Department of Transportation. The WisDOT Certified Aggregate Sampling Technician course manual was developed with these valuable resources:

    1. ASTM D 3665 Standard Practice for Random Sampling of Construction Materials

    2. WisDOT Construction and Materials Manual (C & M Manual) 3. WisDOT Standard Specifications for Highway and Structure Construction 4. Supervisors Safety Manual, Fifth Edition 5. The Aggregate Handbook, National Stone, Sand, and Gravel Association 6. Portland Cement Concrete Materials Manual, FHWA 7. Hot-Mix Bituminous Paving Manual, FHWA


    The HTCP Certified Aggregate Sampling Technician Manual committee members have been instrumental contributors to the contents of this course manual. The committee members are: Robert Jewell The Kraemer Company Eric Zeinert Michels Materials Jeff Michalski WisDOT North Central Region Joseph White WisDOT, Bureau of Technical Services, Retired John Brophy WisDOT North Central Region Richard Sorensen-WisDOT QMP Engineer WisDOT Technical Assistance Hotline Representative:

    Tom Brokaw, WisDOT, Bureau of Technical Services (608.246.7934)


    Course Overview TOPIC A Safety Considerations TOPIC B Aggregate Properties for Base Course TOPIC C ASTM D 3665 Standard Practice for Random Sampling Aggregates TOPIC D WisDOT Aggregate Sampling Procedures TOPIC E Hot Mix Asphalt-Truck Box Sampling TOPIC F Data Entry TOPIC G WisDOT Standard Specification Part 3: Bases and Subbases (for Aggregate Gradations) Section 301, 305 Part 4: Pavements (for Aggregate Gradations) Section 460-460.2.2.3 Part 5: Structures (for Aggregate Gradations) Section 501-501.2, 501.2.5.1-501.2.5.5 QMP: Base Aggregates Lab Exam Laboratory Exam QMP Award Expanded QMP Award Corr. / Eval. Corrections and Course Evaluation

  • Course Syllabus i 8:00 8:15 Registration, Introductions, Course Objectives, Course Syllabus 8:15 8:30 Safety Considerations 8:30 9:30 Aggregate Properties for Crushed Aggregate Base Course (CABC)

    FHWA Segregation Video 9:30 9:45 Break 9:45 10:45 ASTM D 3665 Standard Practice for Random Sampling Aggregates, Hot Mix Asphalt-Truck Box Sampling, Data entry 10:45 11:45 Laboratory Demonstration of WisDOT Aggregate Sampling Procedures

    Sample Size Requirements

    Sampling from Stopped Conveyor Belt

    Sampling from a Conveyor Belt Discharge

    Sampling from Stock Piles

    Sampling from Roadbed Windrows

    Sampling after being Placed Roadbed 11:45 12:45 Lunch Break 12:45 1:45 Laboratory Student Hands-on Practice WisDOT Aggregate Sampling Procedures

    Sample Size Requirements

    Sampling from Stopped Conveyor Belt

    Sampling from a Conveyor Belt Discharge

    Sampling from Stock Piles

    Sampling from Roadbed Windrows

    Sampling after being Placed Roadbed 1:45 TBA Practical Laboratory Student Examination TBA Break TBA WisDOT Standard Specifications, Section 301, 305, 460, and 501 and 501, for Aggregate Gradations TBA Review for Written Examination TBA Written Examination Adjourn

  • Course Overview ii Introduction The Highway Technician Certification Program (HTCP) welcomes you to the Certified Aggregate Sampling Technician course. This course requires eight hours of classroom/laboratory attendance. The course content will cover safety considerations; aggregates properties for base aggregate dense (BAD); ASTM D 3665 standard practice for random sampling; WisDOT aggregate sampling procedures; and WisDOT standard specifications Sections 301, 305, 310, 311 and 501 for aggregate gradations. Course Prerequisites None required. A person may earn 0.8 continuing education units (CEUs) upon successful completion of this course. Certification Requirements The written examination will be limited to a maximum duration of one (1) hour. The written examination will be open book and open notes and will consist of true/false and multiple-choice questions, and essay problems. A student will be required to obtain a passing score of 70 percent to be certified as an Aggregate Sampling Technician. Recertification Requirements Recertification is mandatory every three (3) years. The HTCP will send a recertification notice to each certified technician and the firm or agency before the expiration date of the highest certification level(s) of certification obtained. The certified technician must apply for recertification before the expiration date of the highest level(s) obtained. Each certified technician is responsible for obtaining his/her recertification.

    Revocation/Suspension of Certification Upon written request from any individual, firm, agency, or contractor associated with the HTCP, the HTCP director will provide technical assistance in investigating any alleged report(s) of either certified technician incompetence or act(s) of malfeasance. The HTCP director will then notify WisDOT of the report findings concerning certified technician incompetence or misconduct.

  • Course Overview iii Highway Technician Certification Program Goal The principle goal of the Highway Technician Certification Program (HTCP) is to certify that individuals have demonstrated the abilities to engage in quality control/quality assurance activities in highway work contracted by the Wisconsin Department of Transportation (WisDOT). Introduction of Course Participants At this time, you will be asked to introduce yourself, company name, years of service to the highway construction materials industry, and your present occupational duty. What do you expect from this Training Course? This is your opportunity, as a course participant, to ask the course instructor to cover any other topics related to the Certified Aggregate Sampling Technician course. Please list and identify topics below: Duties and Responsibilities of an Aggregate Sampling Technician: The duties and responsibilities of an Aggregate Sampling Technician are:

    Know the safety, handling, and storage requirements for the equipment.

    Know how to collect non-biased aggregate samples utilizing ASTM D 3665 Random Sampling mathematical method.

    Know who is responsible for sampling, where samples, minimum frequency of sampling, and sample size for specified designation.

    Know the proper WisDOT sampling aggregate procedures.

    Be able to procure, properly label, and promptly deliver appropriate size samples to specified designation.

  • Course Overview iv Definitions and Terminology

    Aggregate An inert mineral material such as sand, crushed gravel, crushed stone, or combinations thereof.

    Absorption The process of a solid taking up liquid into its interior by capillarity.

    Base Course The layer or layers of specified or selected material of designed thickness placed on a subbase or a subgrade to support a surface course.

    Blue Tops Wooden hubs or stakes driven into the subgrade to indicate the finished subgrade elevation.

    Borrow Suitable material from sources outside the right-of-way limits of the project, used primarily for embankments.

    Coarse Aggregate Aggregate predominately retained on the No. 4 sieve.

    Dense Graded Aggregate

    A well-graded aggregate proportioned to contain a relatively small percentage of voids.

    Density The weight per unit volume of a material, usually expressed in pounds per cubic foot.

    Embankment The mound of soil, soil-aggregate, or broken rock constructed above the embankment foundation and below the subgrade.

    Fine Aggregate Those aggregates which entirely pass the 3/8" sieve, almost entirely pass the No. 4 sieve, and are predominately retained on the No. 200 sieve.

    Fineness Modulus A numerical value obtained by adding the total percentages of a sample of the aggregate retained on each of a specified series of sieves and then by dividing the sum by 100.


    A general term used to describe the composition by size of the aggregate particles in a mixture. It is usually expressed as the proportion (percent) of the aggregate that will pass a series of designated standardized sieves.

    Granular Backfill Backfill of a specified gradation and consisting of sand, gravel, crushed gravel, crushed stone, or other fragmented material.

    Moisture Content The proportion of moisture present in a material, expressed as a percentage of the oven-dry weight of the material.

    Moisture-Density Relationship

    The effect of moisture content on the density of a soil compacted according to specified conditions.

    Nominal Maximum Particle Size

    The nominal maximum size as indicated by the appropriate specification or descript


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