341ASPHALT MEMBRANE INTERLAYER

341-1 Description.

Construct an asphalt membrane interlayer composed of a separate application of asphalt binder covered with a single application of aggregate. Obtain asphalt binder from a plant that is currently on the Department’s Production Facility Listing. Producers se eking inclusion on the list shall meet the requirements of Section 916.

341-2 Materials.

341-2.1 Asphalt Binder: Use a PG 76 -22 meeting the requirements of Section 916 and

listed on the Department’s Approved Products List (APL).

341-2.2 Cover Material: Use Size No. 6 stone, slag, or gravel meeting the requirements

of Section 901.

341-3 Equipment.

341-3.1 Power Broom: Provide a power broom for cleaning the existing pavement

capable of removing all loose material from the surface.

341-3.2 Spreading Equipm ent: Provide a self -propelled aggregate spreader that can be

adjusted to accurately apply the cover material at the specified rate and that spreads the material uniformly.

341-3.3 Rollers: Provide self -propelled, pneumatic -tired traffic type rollers equip ped

with at least 7 smooth-tread, low -pressure tires, and capable of carrying a gross load of at least 8 tons. Maintain a minimum tire inflation pressure of 90 psi, or as specified by the manufacturer, such that in no two tires the air pressure varies more than 5 psi. Load the traffic roller as directed by the Engineer.

341-3.4 Mixing Equipment: Use mixing equipment for asphalt binder designed for that

purpose and capable of producing and maintaining a homogeneous mixture of asphalt cement at the specified temperature.

341-3.5 Pressure Distributor: Use a pressure type distributor to apply asphalt binder

capable of maintaining a homogeneous mixture of asphalt cement at the specified temperature and consistently apply the material in a uniform manner.

341-4 Contractor’s Quality Control.

Provide the necessary quality control of the asphalt binder, and interlayer construction in accordance with the Contract requirements. If the rate of application varies by more than 5% from the rate set by the Engineer in acc ordance with 341 -6, immediately make all corrections necessary to bring the spread rate into the acceptable range. The Engineer may take additional measurements at any time. The Engineer will randomly check the Contractor’s measurement to verify the spread rate.

341-5 Construction Procedure.

341-5.1 Preparation of Surface: Prior to application of the asphalt binder, clean the

existing pavement as specified in 300 -5.

341-5.2 Application of Asphalt Binder: Apply the asphalt binder only under the

following c onditions:

341-5.3 Application of Cover Materia l: Immediately after application of the asphalt

binder, uniformly spread the cover material at a rate of 0.26 and 0.33 ft3/yd2. The Engineer will set the exact rate. Determine the application rate at the beginning of each day’s production, and as needed to control the operation, a minimum of twice per day. Maintain an application rate such that the pavement is covered uniformly with aggregate, and is one aggregate layer thick. For the cover material, use aggregate that is reasonably free of any adherent coa tings and that does not contain excessive moisture. Immediately after the application of cover material, check the surface to ensure a uniform distribution of cover material and a smooth surface. Do not separate the application of the asphalt binder and the application of the cover material by more than 300 feet, unless approved by the Engineer.

341-5.4 Rolling: In order to ensure maximum embedment of the aggregate, cover the

entire width of the mat immediately by traffic rollers. For the first coverage, provide a minimum of three traffic rollers in order to accomplish simultaneous rolling in echelon of the entire width of the spread. After initial rolling, immediately correct all portions of the completed surface, that the Engineer deems defective (not properly covered by aggregates, fat spots, excessive free aggregate, etc.). Following the first coverage, make additional coverages with traffic rollers as directed by the Engineer.

341-5.5 Traffic Control: For the normal sequence of construction operations, place the

first course of asphalt concrete overlay over the membrane prior to opening to traffic.

341-6 Unacceptable Asphalt Membrane Interlayer.

If the asphalt membrane interlayer is unacceptable due to incorrect blending, application rate, or not meeting the requirements of this Section, or damaged prior to placement of the asphalt concrete layer, remove and replace it as directed by the Engineer at no additional cost to the Department . Do not apply excessive amounts of asphalt binder.

341-7 Placement of Asphalt Concrete Overlay.

Ensure that the thickness and temperature of the initial layer of asphalt concrete placed on top of the asphalt membran e interlayer are such that the overlay bonds to the interlayer and the underlying layer without voids or excessive binder. Core the asphalt overlay as directed by the Engineer to evaluate the binder and aggregate spread rates, as well as the effectiveness of the asphalt concrete overlay in producing a well -bonded interlayer.

341-8 Method of Measurement.

341-8.1 Asphalt Membrane Interlayer: The quantity to be paid for will be plan

quantity, in square yards, completed and accepted.

341-8.2 Bituminous Materi al (Asphalt Binder -Interlayer): The quantity will be the

volume, in gallons, determined as provided in 300 -9. FY 2023-24 Return to Table of Contents

341-8.3 Submittal of Certification of Quantities for Bituminous Material: Prepare

and submit a Certification of Quantitie s to the Engineer in a ccordance with 9 -2.1.2.

341-9 Basis of Payment.

341-9.1 Asphalt Membrane Interlayer: Price and payment will be full compensation

for all work specified in this Section, including furnishing cover materials, handling, spreading, rolling, bituminous material, and other incidental work necessary to complete this item.

341-9.2 Payment Items: Payment will be made under:

Item No. 341 - 1- Asphalt Membrane Interlayer - per square yard. FY 2023-24 Return to Table of Contents SECTION 346 STRUCTURAL PORTLAND CEMENT CONCRETE

346-1 Description.

Use a Department -approved concrete mix design composed of a mixture of portland cement, aggregate, water, admixtures, and supplementary cementitious materials . Deliver the portland cement concrete to the site of placement in a freshly mixed, unhardened state. Obtain concrete from a plant that is cur rently on the Department’s Production Facility Listing. Producers seeking inclusion on the list shall meet the requirements of Section 105. If the concrete production facility’s Quality Control (QC) Plan is suspended, the Contractor is solely responsible t o obtain the services of another concrete production facility with an accepted QC Plan or await the reacceptance of the concrete production facility’s QC Plan prior to the placement of any further concrete on the project. There will be no changes in the Co ntract Time because of the suspension, as described . Bear all delay costs and other costs associated with the concrete production facility’s QC Plan acceptance or reacceptance.

346-2 Materials.

346-2.1 General: Meet the following requirements:

Coarse Aggr egate ................................ ............................ Section 901 Fine Aggregate* ................................ .............................. Section 902 Portland Cement and Blended Cement ........................... Section 921 Water ................................ ................................ ...............Section 923 Admixtures** ................................ ................................ ..Section 924 Supplementary Cementitious Materials .......................... Section 929 *Use only silica sand except as provided in 902 . **Use products listed on the Department’s Approved Product List ( APL). Do not use materials containing hard lumps, crusts , or frozen matter, or that is contaminated with material s exceeding the specified limits in the above listed Sections.

346-2.2 Types of Cement: Unless a specific type of cement is designated in the Contract

Documents , use Type I, Type IL, Type IP, Type IT, Type IS, Type II, or Type III cement in all classes of concrete. Use Type IL, Type IT, or Type II for all mass concrete elements. Use only the types of cements designated for each environmental classification in structural concrete as shown in Table 346-1. A mix design for a more aggressive environment may be used in a less aggressive env ironmental condition. FY 2023-24 Return to Table of Contents