- 773 - SECTION 1001 -- GENERAL MATERIALS DEFINITIONS AND REQUIREMENTS
1001.01 General
1.Materials used in Department contracts shall meet the requirements described in Division 1000.
2.The Department has five me thods of accepting material characteristics that are incorporat ed into the project. The methods of acceptance are listed below:
a.Sample/Test b. Certification of Test (COT) c. Certification of Compliance (COC) d. Department’s Approved Products List e. Visual 3. Descriptions of the methods of acceptance listed above are described in the following sections.
4.Material characteristics may be accepted using one or more methods of acceptance, with the ex ception of the Department’s Approved Products List.
1001.02 Certified Tests
1.Most certified tests, sa mpling frequencies, and material certifications are identifie d and their procedures outlined in the Department’s Materials Sampling Guide and the Standard Method of Tests .
2.The contract shal l identify other certific ation tests which are required and the number of copies of certification reports to provide.
3.Sample and Tests: This method of acceptance is when a material is accepted based on physical tests char acteristics, conducted by a qualified laboratory, as described in the associated material specifications.
4.Certificate of Compliance (COC ): Certificate of Compliance shall state that the material or item meets all requirements defined for the project. Each COC will include all pertinent data for the materials represented by the certificate.
a.COC shall be signed by the manufacturer's authorized representative and indicate the representative's job title.
5.Certificate of Test s (COT): Manufacturer’s Ce rtificate of Tests shall show the required test results and certify that they are correct. In some instances, such as steel for reinforcem ent, the process of manufacture must also be shown.
a.COT shall be signed by the manufacturer's authorized representative and indicate the representative's job title.
6.Manufacturer's certified test s, reports, and certificates of compliance shall show:
a.The project number.
b.The name of the Contractor.
c.Data analyzed (reports only).
1001.02 General Materials Definitions and Requirements
- 774 - d. Tests performed.
e.The quantity of material covered. (Indicate lot numbers.)
f.The Department’s specificat ions that the product is in compliance with. g. Signature and title of an authorized representative. 7. Materials which must be documented by a certificate of compliance, certified tests, or test reports, shall not be incorporated into the work until such documents have been delivered to the Engineer and verified for compliance.
a.The Contractor will be notified by the Engineer if the material is not acceptable for use in the project.
8.The cost of providing the CO C, the COT and all expenses incurred regarding testing and sampling will not be paid for directly. This will be considered subsidiary to items for which the contract provides direct payment.
1001.03 Department’s Approved Products List
1.Materials identified on the Department’s Approved Products List may be incorporated into the work by notifying the Engineer of the specific brand name that is to be used.
2.Materials identified on the Department’s Approved Products List do not require additional methods of a cceptance for the approved application.
3.Materials added to the Departm ent’s Approved Products List after the letting date of a project may be incorporated into the work even though they were not listed on the letting date.
4.Materials not identified on the De partment’s Approved Products List may be used, provided the following cr iteria are met and approved by the Engineer: a. The specifications or spec ial provisions specify that the material must meet appropriate ASTM, AASHTO, Federal, other specifications, and; b. There are no other Depart ment specification requirements such as required testing by the Department prior to use, and; c. A certificate of compliance and/or certified test report is submitted to the Engineer by the Co ntractor prior to incorporating the material into the work. 5. a. Suppliers and vendors with materials that may qualify for addition to the Department’s Approved Products List may use the New Products Evaluation Request Form f ound on the Department website.
b.Products may also be submitted on-line, through the Department’s website.
1001.04 Visual Acceptance
1.Materials, as determined by the department, may be accepted by visual inspection by the Engineer. - 775 - SECTION 1002 -- PORTLAND CEMENT CONCRETE
1002.01 Description
1.Concrete shall consist of aggregate, Portland cement, water, approved air-entraining and other admixtu res, and pozzolans as required or allowed by these Specifications.
2.All pay items that include t he class of concrete will have the appropriate designation added to the pay item to show the 28-day compressive strength. For exampl e: 47B concrete with a 28-day compressive strength requirement of 3500 psi (25 Mpa) shall be identified as Class 47B-3500 (47B-25). The 7-day compressive strength should be 70% of the 28-day compressive strength.
1002.02 Material Characteristics
1.All materials shall conform to the requirements in Table 1002.01. Table 1002.01 Material Requirements Applicable Materials Section Portland Ce ment ........................................ 1004 Water for Conc rete .................................... 1005 Concrete Aggregate ................................... 1033 Fly Ash ....................................................... 1008 Admixtures ................................................. 1007 Silica Fume ................................................ 1009
a.Concrete mixes will be in accordance of Table 1002.02
2.The Contractor may elect to substitute an acceptable class of concrete shown in Table 1002.03 at no additional cost to the Department. The Engineer shall be notified of an y substitutions before batching the concrete.
3.Type IP, IS and IT Interground/Blended cement shall be used for all classes of concrete except for pavement repair. Type IP, IS and IT Interground/Blended cement shall meet all requirements of ASTM C 595. Pavement repair shall include Type I/II Portland cement for Class PR1 concrete and Type III Portland cement shall be used in Class PR3 concrete.
4.Temperature Requirements: a. The temperature of the mixed concrete shall be not less than 50°F (10 C) immediately after being placed.
b.When the air temperature in the shade and away from artificial heat is less than 35°F (2 C), the Engineer may require the water and/or aggregates to be heated to not less than 70°F (21 C) nor more than 150°F (65C), such that the temperature of t he mixed concrete shall not be less than 50°F (10 C) at the time of placement.
c.Stockpiled aggregates may be heated by the use of dry heat or steam. Aggregates shall not be heated di rectly by gas or oil flame or on sheet metal over fire. Aggregates may be heated in bins with a steam-coil or water-coil system or by other methods which are not detrimental to the aggregates.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 807–808 of 1,048.