721 for furnishing all material, equipment and labor for maintaining, realigning and adjusting the attenuator installation, as specified herein and as shown on the plans. No payment will be made for attenuators not in service, such as attenuator stockpiled for replacement parts or awaiting phase construction change. 702- 1 Description: The work under this section shall consist of furnishing all materials and installing permanent attenuation devices of the types designated and at the locations sh own and in accordance with the plans and the requirements of the specifications. 702- 2 Materials: 702- 2.01 General: Materials used in the construction of the vehicular impact attenuator system shall all be new except that undamaged attenuation devices used for Maintenance and Protection of Traffic may be used for permanent installation when approved by the Engineer. Materials used in transitions or connections between impact attenuators and metal -beam guardrail shall conform to the requirements of Section 1012 of the specifications . Materials used in transitions or connections between impact attenuators and concrete structures or barriers shall conform to the applicable requirements of Subsection 910- 2 of the specifications, except anchors and anchor bolts shall conform to the requirements of Section 1012 of the specifications. Concrete shall be utility concrete conforming to the requirements of Section 922 of the specifications. Steel reinforcement shall conform to the requirements of Section 1003 of the specifi cations. Asphaltic concrete shall conform to the requirements of Section 409 of the specifications. Attenuation devices approved for use are shown on the Department’s Approved Products List (APL). The most current version is available on the ADOT Engineering and Construction, Product Evaluation Program Website. Attenuation devices other than those listed on the APL must be approved by the Department prior to use. TABLE OF CONTENTS INDEX 722 702- 2.02 Blank : 702- 2.03 Sand Barrel Crash Cushion: The barrels used in s and barrel crash cushions shall be frangible, plastic barrels formulated or processed to resist deter ioration from ambient ultraviolet light. The barrels shall exhibit good workmanship and shall be free of structural flaws and objectionable surface defects. When filled with the specified weight of sand, the bar rel walls shall not distort, either as an indentation or a protrusion, more than 1/2 inch from the original barrel wall configuration. Each barrel shall be clearly labelled with the design weight of the filled barrel. The barrels shall have design weights consistent with those shown on the project plans. The Engineer may open the barrels to verify fill height and weight based on manufacturer’s literature. When sand barrel crash cushions are installed at elevations above 3,000 feet, a minimum of 5 percent rock salt (by weight) shall be thoroughly mixed with the sand. Regardless of whether barrels are pre- filled or filled in place on the project site, the Department will sample the sand or the sand/rock salt mixture. For barrels filled in place the sand, or the sand/rock salt mixture if used, will be sampled in accordance with Arizona Test Method 105 and will be accepted only upon test results indicating conformance to the requirements herein. If the Department accepts the sand barrel crash cushi on, a permanent unique identifier will be affixed to the barrel indicating conformance with the requirements specified herein. Pre-filled barrels delivered to the project shall have been inspected by the Department in advance and shall each have a Department -furnished unique identifier that is permanently affixed to the barrel corresponding to a production lot(s) for which Department test results indicated conformance with the requirements specified herein. Pre- filled barrels not having a Department -furnished unique identifier will not be accepted. Upon delivery the contractor shall furnish a Certificate of Compliance, in accordance with the requirements of Subsection 106.05 of the specifications, for each production lot from which filled barrels are supplied. The Certificate of Compliance shall include a statement of the following:
filling of the barrels with sand or a sand/rock salt mixture, has been completed as directed by the manufacturer ; and TABLE OF CONTENTS INDEX 723
the unit weight of the sand in accordance with the manufacturer’s recommendations. Barrels shall be filled to the specified weight with clean concrete sand meeting the requirements of ASTM C33 or alt ernatively, sand (fine aggregate) meeting the requirements of Subsection 1006- 2.03(B) of the specifications. The sand, immediately prior to placement in the barrel, shall have a dry unit weight of 90 to 110 pounds per cubic foot when tested in accordance w ith AASHTO T 19 (Shoveling Method) and a moisture content of less than 2 percent in accordance with AASHTO T 255. Sampling of the sand for pre- filled barrels will be performed by the Department on a production lot basis. The supplier shall notify the Depar tment at least 10 days prior to filling barrels. A Certificate of Analysis for the sand, conforming to the requirements of Subsection 106.05 of the specifications, shall be submitted to the Department upon sampling that indicates the following:
and conformance to ASTM C33 or Subsection 1006- 2.03(B) of the specifications;
and
comprise the production lot. Samples of the sand will be taken in accordance with Arizona Test Method 105 prior to the addition of any rock salt to determine conformance with the requirements of gradation. If the production lot will consist of sand only, the sand will also be tested for conformance with the requirements for dry unit weight and moisture content. When a sand- rock salt mixture is used, the Department will sample, in addition to the sand, the sand- rock salt mixture in accordance with Arizona T est Method 105. The sand- rock salt mixture will be tested to determine conformance with the requirements for dry unit weight, moisture content, and percent rock salt. The percent rock salt will be determined in accordance with Arizona Test Method 744. The rock salt will be sampled to verify the maximum particle size. The entire quantity of sand or sand- rock salt mixture intended for the production lot shall be maintained separately in a stockpile or other suitable means to prevent contamination. The Engineer will notify the supplier of the test results. The test results will reference the Supplier, Production Date(s), Total Dry Weight of TABLE OF CONTENTS INDEX 724 Sand, and Production Lot Number. Production lots containing at least 5 percent rock salt will be identified with an alphanumeric production lot number that includes the prefix “RS”. If the test results are not acceptable, the production lot will be rejected by the Department. The supplier shall notify the Department’s Structural Materials Testing Section at least five days prior to filling the barrels to coordinate observation of the operation by Department’s Structural Materials Testing Section. The Department will observe the filling of the barrels and will affix a unique identifier to each barrel f illed with approved materials in an acceptable manner. The unique identifier will be in the form of a stencil or green tag containing the following information: Supplier, Production Date, Specified Weight of Sand, Production Lot Number, and Lab Report Number. Sand barrel crash cushion installations placed prior to January 1, 2017 for which test results indicate conformance with the material requirements herein will be allowed to remain in use. Lifting, moving, and transporting of sand barrels shall be accom plished in a manner consistent with the manufacturer’s recommendations and shall not result in damage to the sand barrel or cause loss of sand from or vertical migration of sand within the barrel. Sand barrels may be transported and used on one or more projects provided that they are properly identified, have been previously accepted by the Department and are free of defects. Any sand barrel that demonstrates evidence of tampering will not be accepted. 702- 3 Construction Requirements: Attenuation devices shall be placed at the locations shown on the project plans or as directed by the Engineer and shall conform to the details shown on the plans and the requirements of the manufacturer. Unless otherwise specified on the project plans, the attenuation device shall be placed on a paved pad meeting thickness, slope, strength and smoothness requirements of the manufacturer, and shall be made either of utility concrete or asphaltic concrete, at the option of the contractor. Foundation pads for permanent sand barrel arrays shall be 4- inch thick utility concrete or asphaltic concrete. The soil under the pad shall be compacted to not less than 95 percent of the maximum density found in accordance with the applicable test methods of the ADOT Materials Testing Manual, as directed and approved by the Engineer. When installation of the attenuation device is complete, all trash shall be removed from its area and the soil surface around it shall be smoothed to the elevation indicated on the project plans. Any welding required shall be performed in accordance with the requirements of the American Welding Society Structural Welding Code AWS D 1.1 -80. TABLE OF CONTENTS INDEX