INDIANA DEPARTMENT OF TRANSPORTATION Driving Indiana s Economic Growth

Transcription

1 INDIANA DEPARTMENT OF TRANSPORTATION Driving Indiana s Economic Growth Office of Materials Management 120 S. Shortridge Rd. P.O. Box Indianapolis, Indiana (317) FAX: (317) Michael R. Pence, Governor Karl Browning, Commissioner March 20, 2015 MEMORANDUM TO: Management Representatives Certified Aggregate Producers Trial Phase Producers Coordinated Testing Phase Producers FROM: Ronald P. Walker Manager, Office of Materials Management SUBJ: Certified Aggregate Producer Program Included below are several items pertaining to the Certified Aggregate Producer Program and Standard Specifications for CAPP DOCUMENT LIST (3/20/15) (see attachment) STANDARD SPECIFICATIONS MSE Retaining Wall Requirements (RSP 731-B-205) Recurring Special Provision 731-B-205 that has been placed in contracts containing MSE Retaining Walls includes a provision that the Coefficient of Uniformity, Cu of the backfill for all MSE designs using ribbed steel straps shall use a design input value of 4.0. This is an AASHTO LFRD Bridge Design Specification requirement. The definition of the Coefficient of Uniformity is as follows: Cu = coefficient of uniformity is defined as the ratio of the particle size that is 60 percent finer in size (D60) to the particle size that is ten percent finer in size (D10) The Geotechnical Laboratories that are conducting testing of structural backfill material for retaining wall systems containing metal components in contact with structure backfill have been instructed to accept natural sand No. 4 structural material with a minimum Cu value of 3.0 or greater. The Cu value only applies to natural sand No. 4 structural backfill. All other required sizes and types of aggregate for Type 3 structural backfill aggregates in accordance with RSP 7731-B-205 will not require a Cu value to be determined.

2 TEST METHODS The following revisions to the AASHTO and ITM test methods have been made for 2015: AASHTO T 27 Sieve Analysis of Fine and Coarse Aggregate 1. Section 8.1 (Procedure) -- Revised to require that the sample dried to constant weight is weighed to the accuracy of the balance. The balance is required to have sufficient capacity, be readable to 0.1 percent of the sample weight or better, and conform to the requirements of M 231. This will not require a revision to our requirements. 2. Section 8.6 (Procedure) -- Revised to require that when comparing the total weight of material after sieving with the total original dry weight, the two amounts shall be within 0.3% based on the total original dry sample weight. This will not require a revision to our requirements. AASHTO T 85 Specific Gravity and Absorption of Coarse Aggregate 1. Section 8.4 (Procedure) -- Added "Maintain the water level in the bath at the overflow depth to obtain a constant water level throughout the test." If this test method is being conducted in accordance with the Quality Control Plan, this change is required. AASHTO T 248 Reducing Samples of Aggregate to Testing Size 1. Section 5.2 (Selection of Method) -- Section 5.2 was revised to include only procedures for Coarse Aggregates and a new Section 5.3 was added to include procedures for Combined Coarse and Fine Aggregate. Section 5.3 includes the following: "Samples that are in a dry condition may be reduced in size by either Method A (Mechanical Splitter) or Method B (Quartering). Samples having free moisture on the particle surfaces may be reduced in size by quartering according to Method B. When Method A is desired and the sample is damp or shows free water, dry the sample until it appears dry or until clumps can be easily broken by hand (Note 2). Dry the entire sample to this condition, using temperatures that do not exceed those specified for any of the tests contemplated, and then reduce the sample. The miniature stockpile Method C is not permitted for combined aggregates." This requirement will not require a change to our procedures. 2. Note 2 (Selection of Method) -- A new Note was added as follows: "The dryness of the sample can be tested by tightly squeezing a small portion of the sample in the palm of the hand. If the cast crumbles readily, the correct moisture range has been obtained." This change is guidance for No. 53 and No. 73 aggregate sizes and is a recommended procedure to determine if the correct moisture content of the sample is correct prior to splitting the sample.

3 CONTROL PROCEDURES FOR CLASSIFICATION OF AGGREGATES (ITM 203) Revisions to ITM 203 for 2015 include the following: 1. Terminology Class AS aggregate definition was added. 2. Frequency of Sampling and Testing (General) For precast prestressed concrete items, the requirement to obtain a ledge sample from stone sources was removed. Many of the newer sources are located out-of-state and the process of obtaining ledge samples is very difficult. Provisions for these sources are made to obtain historical quality data from the state the source is located, obtain Production samples for initial classification of the aggregate, and increase the frequency of sampling to maintain the quality rating. 3. Frequency of Sampling and Testing (Testing Location) Crushed particle testing was added as a test that the District laboratory will perform for Production quality samples. Also, the Micro-Deval test was added as a test that the Office of Materials Management or an AASHTO Accredited Laboratory will conduct for Production quality samples. CERTIFIED AGGREGATE PRODUCER PROGRAM (ITM 211) Revisions to ITM 211 for 2015 include the following: 1. Start of Production Testing -- The requirement for Start of Production testing when producing a material after a seasonal shut down was removed. The original intent of this frequency was to recognize that if there were a major plant change, such as a new crusher, the gradation of each Certified Aggregate could possibly change. Since changing a crusher is rarely done and if done the source would check the gradation anyway, the requirement to test 1/1000 ton after a seasonal shutdown for all Certified Aggregates is not required. 2. Gradation Control -- SC11, SC12, and SC16 were added to the list of coarse aggregate materials requiring a critical sieve and a critical sieve was designated for each. SC aggregates are being used routinely for chip and seal operations and are being listed as Certified Materials in the CAPP. 3. Quality Control Plan -- The physical address and mailing address, if different than the physical address, are required in the QCP for each Plant/Redistribution Terminal 4. Quality Control Plan -- The procedure for contacting the Parent Company, Management Representative, Certified Aggregate Technician(s) and Qualified Technician(s) is required to be included in the QCP. 5. Quality Control Plan -- A requirement that sources with lightweight aggregate include the procedures for sampling and testing the aggregate for determination of the specific gravity factor and absorption in accordance with ITM 222 was added. 6. Quality Control Plan -- A requirement that the addenda authentication page be signed by the Management Representative and subsequently signed by the District Testing Engineer upon approval was added.

4 3/20/15 7. Certification -- An Inactive Status section that designates the procedures for a Certified Aggregate Producer to temporarily suspend the Certification was added. Included are the procedures for shipment of Certified Materials during suspension and the requirements for reinstatement of the Certified Aggregate Producer status. TRAINING MANUALS Inspection and Sampling Procedures for Fine and Coarse Aggregates (September, 2014) The revisions to this manual included editorial revisions to several chapters and revisions to address the previously mentioned specification and test method revisions. The manual may be accessed at: Quality Assurance Certified Aggregate Technician Manual for Producer Technicians (September, 2014) The revisions to this manual also included editorial revisions to several chapters and the specification and test method revisions. The manual may be accessed at: Please your receipt of this document to rsummers@indot.in.gov. Future correspondence with you will be by . Also, if you are not currently listed as the designated Management Representative for your source and would like to have future correspondence sent to another representative of your company, please the name, address, and phone number of the person to rsummers@indot.in.gov. rpw c: District Testing Engineers R. Rees R. Jones R. Summers File

5 3/20/15 CERTIFIED AGGREGATE PRODUCER PROGRAM DOCUMENT LIST 1. Standard Specifications Current Supplemental Specs. -- Sections 211, 301, 302, 303, 904 and ITM Indiana Department of Transportation Certified Aggregate Producer Program (11/13/14) 3. Indiana Department of Transportation Inspection and Sampling Procedures for Fine and Coarse Aggregates. (September, 2014) 4. Indiana Quality Assurance Certified Aggregate Technician Manual for Producer Technicians (September, 2014) 5. Current INDOT, AASHTO and ASTM Test Method (Attached List) Note: All documents may be maintained electronically or by hard copies. -1-

6 TEST METHODS Indiana Test Methods T Acid Insoluble Content of Fine Aggregates (1/1/08) P Control Procedures for Classification of Aggregates (11/13/14) T Acceptance Procedures for Dolomite Aggregates (1/1/08) T Scratch Hardness of Coarse Aggregate Particles (1/1/08) T Sampling Stockpiled Aggregates (1/1/08) T Soundness of Aggregates by Freezing and Thawing in a Brine Solution (1/1/08) T Class AP Coarse Aggregate for Concrete Pavement and Slab-on-Grade Concrete. (1/23/14) T Acceptance Procedures of Air Cooled Blast Furnace Slag for Leachate Determination (1/1/08) T Acceptance Procedures of Steel Furnace Slag for Deleterious Materials (11/14/08) T Specific Gravity Factor and Absorption of Lightweight Fine Aggregate (1/23/14) T Verifying Sieves (3/6/09) T Verifying Mechanical Shakers (1/1/08) T Verifying Balances (4/6/10) AASHTO and ASTM Test Methods AASHTO T 2-91 AASHTO T AASHTO T AASHTO T AASHTO T AASHTO T AASHTO T ASTM D ASTM D Sampling of Aggregates Materials Finer Than 75 m (No. 200) Sieve in Mineral Aggregates by Washing Sieve Analysis of Fine and Coarse Aggregates Specific Gravity and Absorption of Fine Aggregate Specific Gravity and Absorption of Coarse Aggregate Clay Lumps and Friable Particles in Aggregate Reducing Field Samples of Aggregate to Testing Size Flat or Elongated Particles in Coarse Aggregate Determining the Percentage of Fractured Particles in Coarse Aggregate -2-