Introduction to Asphalt (Manual Series)
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This section consists of a brief history of the Marshall mix design method followed by a general outline of the actual method. This outline emphasizes general concepts and rationale over specific procedures. Detailed procedures vary from state-to-state but typical procedures are available in the following documents:. Motivation for this search came from the ever-increasing wheel loads and tire pressures produced by larger and larger military aircraft.
Early work at the U. The most promising method eventually proved to be the Marshall Stability Method developed by Bruce G. Marshall at the Mississippi Highway Department in WES took the original Marshall Stability Test and added a deformation measurement using a flow meter that was reasoned to assist in detecting excessively high asphalt contents. This appended test was eventually recommended for adoption by the U.
Army because:. WES continued to refine the Marshall method through the s with various tests on materials, traffic loading and weather variables. Today the Marshall method, despite its shortcomings, is probably the most widely used mix design method in the world. It has probably become so widely used because 1 it was adopted and used by the U.
Marshall Method History
Although Hveem did not specifically develop an aggregate evaluation and selection procedure, one is included here because it is integral to any mix design. A typical aggregate evaluation for use with either the Hveem or Marshall mix design methods includes three basic steps Roberts et al. The Marshall test does not have a common generic asphalt binder selection and evaluation procedure. Each specifying entity uses their own method with modifications to determine the appropriate binder and, if any, modifiers.
Binder evaluation can be based on local experience, previous performance or a set procedure. Once Contractor-DOT relations deteriorate, the work suffers. Since the technician's primary concern is to preserve the quality of the work, he should show common courtesy at all times, even when tempted not to do so. Although desired qualities for prospective technicians can be listed, the bottom line is this: To do a professional job, the technician must want to do a good job, know how to do it, and Q about!!
Certified OMS Level I Plant Technicians are testing personnel and are required to be at the plant site at all times during production of material for the project. A plant operator who is a certified Asphalt Plant Technician Level I may be utilized to meet this requirement when daily production for each mix design is less than tons metric tons provided the randomly scheduled increment sample as defined in Sub-article C 2 is not within that tonnage.
When performing in this capacity, the plant operator will be responsible for all quality control activities which are necessary and required. Absences of the Level I Technician, other than those for normal breaks and emergencies must be pre-approved in writing by the appropriate QA Supervisor or his designated representative s.
Any extended absence of the Technician that has not been approved will result in immediate suspension of production by the Engineer. All mix produced during an unexcused absence of the Level I technician will be accepted in accordance with Article of the Specifications. The Contractor is also required to have readily available on-call a QMS Level II Plant Technician responsible for making process control adjustments and solving mix problems. He must be located such as to be able to respond to all plant mix problems in a timely manner. All Roadway Technicians are required to be certified through the Department's current certification program.
The Contractor is required to have at least one certified roadway technician on the project at all times during normal laydown operations. This person is responsible for monitoring all roadway paving operations and all quality control processes and activities, to include stopping production or implementing corrective measures when warranted.
The Contractor's technician s must meet the same requirements as DOT personnel and will be certified by the same certification program. The Asphalt Laboratory may be contacted at for further instructions on how to access this information. This listing may be used to verify certification of personnel working on QMS Superpave projects. The Soils Engineer will maintain a listing of all certified QMS Density Gauge Technicians and may be contacted at for verification of these.
This listing will also be maintained in a computer database. He may do so by use of his own personnel or by hiring an approved agency to do it for him. Whichever the case, any technician performing mix designs for use on OMS specification projects must be certified through the Department's current mix design certification program.
The Asphalt Design Engineer may be contacted at for verification of a technician's mix design certification. An organizational chart, including names, telephone numbers, and current certification numbers of all the Contractor's personnel responsible for the quality control program shall be posted in the Contractor's laboratory while the asphalt paving work is in progress.
NCDOT Asphalt Technician Certification Program General The certification of asphalt technicians is a program by which it can be reasonably assured that both the DOT's quality assurance personnel and the Contractor's quality control personnel are knowledgeable and qualified to perform the required sampling, testing and inspection of asphalt mixtures and pavements. Certification will also include a general knowledge of the techniques and equipment used in the construction of asphalt pavements, including asphalt plant operations, placement operations and compaction operations.
Under the NCDOT program, a technician may be certified in either mix design techniques, plant operations, roadway operations, density gauge operations, or all of these. Certification in either area will include some overlap into the other area. For example, a certification in plant operations will include a basic knowledge and understanding of roadway procedures, etc.
This is required since it can be readily seen that proficiency in one area requires some general knowledge of the overall operation. The certification program will be operated on a continuing basis. There will be classes and examinations scheduled throughout each year. In addition, there will be a continuous "on-the-job" training. The Asphalt Design Engineer will provide applications for and maintain a master training schedule of all related classes. Enrollment procedures for these training classes are included at the end of this Section. All certifications will generally be effective for four years beginning from the date of passing the certification test and then must be renewed.
Details for renewal of certifications are covered later in this section. Types of Certifications Listed next are the different types of certifications related to asphalt pavements and a basic job description for each. As mentioned previously, a technician may be certified as any one or more of these, or possibly all of these. As noted in the prerequisites listed later, some certifications require a lower level certification before advancement to the next level of certification.
QMS Superpave Certifications 1. A Technician trained and competent in testing and inspection of Superpave asphalt mix at the plant.
A Technician trained and competent in making Superpave mix adjustments and solving Superpave asphalt mix problems. A Technician trained and competent in sampling of Superpave asphalt mix at the plant. A Technician trained and competent in roadway laydown, compaction, and density procedures. A Technician trained and competent in the use of a density gauge in accordance with the QMS specification.
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A Technician trained and competent in the area of Superpave asphalt mix design procedures. QMS Superpave Certification Requirements The basic requirements for these five types of certifications are listed as follows:. Prerequisite s : None 2.
QMS Roadway Technician 1. In this case, a copy of the certification shall be attached to the back of the OJT checklist. In addition, the OJT technician must perform one repetition of all requirements in Parts II, Ill, and IV in the presence of a certified plant technician prior to the check off by a final review technician. All other requirements of this OJT checklist shall be completed as specified.
In either case, the appropriate certification shall be attached to the back of the OJT checklist and included with the class application package. Prerequisite s : Nuclear Safety Training Course b. Experience Requirement: "Hands-on" training after completion of class.
Superpave Mix Design Technician 1. A certificate will be issued for each type certification.
Initial certification will generally be effective for four 4 years beginning from the date of passing the appropriate written exam until December 31st of the 4th year. A Mix Sampling Technician Certification has no expiration date. Failure of an exam will require the person to re-attend the regular class and pass the exam to become certified I re-certified. Upon two consecutive failures of the exam, the person will be required to perform the OJT On-the-Job-Training prior to re-attending the full class and taking the exam, unless otherwise approved by the Asphalt Design Engineer.
Upon satisfactory completion of all requirements, the technician will be issued a certificate. It should be noted that there is no certification for the Introduction to Asphalt Pavements Course.http://senrei-exorcism.com/images/computer/messenger-locate-for-honor-10i.php
Books by Asphalt Institute (Author of The Asphalt Handbook)
This is a very basic asphalt course designed to provide general knowledge of both plant and roadway operations to personnel with little or no experience. It is a prerequisite for several other certifications; therefore, a "completion" certificate will be issued to verify satisfactory completion. A written exam will be given at the end of the course and will be used to judge satisfactory completion. Renewal Certification A technician is required to renew his certification prior to the expiration of the current certificate.
If a Technician's certification expires, he will not be permitted to perform the duties of this expired QMS Superpave Certification until renewal occurs. He will also be required to complete all initial requirements as outlined above.
Asphalt Institute - Introduction to Asphalt (Manual Series)-Asphalt Institute (2001).pdf
Requirements for renewal of certifications are as follows. Attend the regular roadway technician class including passing a written exam. Attend the regular density gauge operators class, including passing a written exam, and a "hands-on" checkoff. Attend the regular mix design certification class including passing a written exam. Loss of Certification by Suspension or Revocation All certified technicians are subject to loss of their certification by suspension or revocation.
Other reasons that might lead to loss of certification include insubordination, gross negligence and apparent incompetence on the part of the technician. All reported occurrences of violations, misuse or abuse of this certification will be documented by the appropriate person s. Suspension or revocation of a certification will be sent by certified mail to the technician, the Quality Control Manager and the Corporate Head of the company that employs the technician.
A technician has the right to appeal any adverse action which results in suspension or permanent revocation of certification by responding, in writing, to the State Materials Engineer within 10 calendar days after receiving notice of the proposed adverse action. Failure to appeal within 10 days will result in the proposed adverse action becoming effective on the date specified on the certified notice. Failure to appeal within the time specified will result in a waiver of all future appeal rights regarding the adverse action taken. The technician will not be allowed to perform duties associated with the certification during the appeal process.
The State Materials Engineer will hear the appeal and make a decision within 7 days of hearing the appeal. Decision of the State Materials Engineer shall be final and shall be made in writing to the technician.