411.01 411-1 SECTION 411 ASPHALT MATERIALS DESCRIPTION
411.01 This work consists of furnishing asphalt materials of all types and the application of
these materials per these specifications and details shown on the plans. MATERIALS
411.02 All asphalt materials shall conform to the requirements of Section 702.
The type and grade of asphalt material will be specified in the Contract. The grade may be changed one step by the Engineer at no change in unit price except as provided for under subsection 104.02. Emulsion used for seal coat will be identified as rapid setting or medium setting emulsion and conform to the requirements of subsection 702.02. CONSTRUCTION REQUIREMENTS
411.03 Asphalt materials shall be fortified when required by the Contract with an additive of an
approved type. Additive shall be uniformly blended with asphalt materials at the refinery, or through an approved in -line blender as specified in the Contract. Asphaltic application methods that result in the discoloration of concrete structures, concrete curbs, and concrete gutters will not be permitted. Coatings shall be applied so as to cause the least inconvenience to traffic and to permit one- way traffic. Traffic will be permitted to travel on fresh asphalt material when it can be accomplished without pickup or tracking of the asphalt material. Asphaltic materials used as fuel or lubricant shall be stored separately. Emulsified asphalt for tack coat shall be diluted before use as shown in the Contract or as directed. METHOD OF MEASUREMENT
411.04 Asphalt cement will be measured by the ton by one of the following methods as
determined by the Engineer:
1.The pay quantity of asphalt cement will be determined by multiplying the total accepted tons of paving mix by the weighted average of all asphalt content percentages obtained from the field acceptance tests for that item, or
2.The pay quantity of asphalt cement will be determined from the invoices for the asphalt cement delivered to the job corrected by tank stabs. Emulsified asphalt and liquid asphaltic materials will be measured by the gallon. The pay quantity for emulsified asphalt shall be the number of gallons before dilution with water. 411.05 411- 2 Concentrated asphalt rejuvenating agent will be measured by the gallon before any water is added. Emulsified asphalt used for seal coat will be measured by the actual number of tons placed and accepted. The pay quantity of emulsified asphalt will be determined from the invoices of emulsified asphalt delivered to the project, corrected by any weight of remaining emulsion in the distributo r truck or tanker at the conclusion of the project. The Engineer may elect to calculate the remaining weight in a distributor by use of the average specific gravity of materials delivered, or by tank stabs. The average specific gravity for this calculati on will be as determined by Central Laboratory Testing. If tank stabs are to be utilized for this measurement, the Contractor’s Process Control Plan shall include appropriate information for calculations on the distributor used on the project. This calculation will be limited to less than 4 ,000 gallons of material. All other material shall require weigh back for proper calculation of payment. The weight shall be determined by certified scales per Section 109. This will also be monitored and documented by daily distributor gauge readings and yield calculations. All proposed methods of weighing materials, calibrating distributor rates and monitoring the yields shall be included in the Process Control Plan per Section 409. Diluted emulsified asphalt used for fog seal on chip seals will be measured by the actual number of tons of asphalt before dilution with water. Correction for the final diluted emulsion at the conclusion of a project will assume a 3:2 emulsion to water dilution rate, and the water subtracted from the weight of the remaining product unless otherwise approved. BASIS OF PAYMENT
411.05 The accepted quantities, measured as provided above, will be paid for at the
contract unit price per ton or gallon as the case may be, for each of the pay items listed below that appear in the bid schedule. Payment will be made under: Pay Item Pay Unit Asphalt Cement ( ) Ton Emulsified Asphalt ( ) Gallon Emulsified Asphalt (Rapid -Setting) (Polymerized) Ton Emulsified Asphalt (Medium -Setting) (Polymerized) Ton Liquid Asphaltic Material ( ) Gallon Asphalt Rejuvenating Agent Gallon Recycling Agent Gallon High float emulsified asphalt (polymerized) or emulsified recycling agent used in Item 406, Cold Asphalt Pavement (Recycle) will be paid for by the gallon under the pay item Recycling Agent. Water used to dilute emulsified asphalt or asphalt rejuvenating agent will not be paid for separately but shall be included in the work. 412.01 412-1 SECTION 412 PORTLAND CEMENT CONCRETE PAVEMENT DESCRIPTION
412.01 This work consists of constructing a pavement composed of Portland Cement Concrete
on a prepared subgrade or base course per these specifications and in conformity with the lines, grades, thicknesses, and typical cross sections shown on the plans or established. MATERIALS
412.02 Materials shall meet the requirements of the following subsections:
Fine Aggregate 703.01 Coarse Aggregate 703.02 Portland Cement 701.01 Fly Ash 701.02 Water 712.01 Air- Entraining Admixtures 711.02 Joint Sealant with Backer Rod 705.01 Curing Materials 711.01 Reinforcing Steel 709.01 Chemical Admixtures 711.03 Dowel Bars and Tie Bars 709.03 CONSTRUCTION REQUIREMENTS
412.03 Classification . Concrete shall conform to the requirements for Class P concrete as
specified in Section 601. Fast track concrete pavement is accelerated Class P concrete.
412.04 Proportioning. Proportioning shall conform to the requirements of subsection 601.05.
412.05 Batching . Batching shall conform to the requirements of subsection 601.06.
The Contractor shall provide a Process Control Plan (PCP) to minimize voids in the concrete pavement, such as clay balls, mud balls and other deleterious materials. It shall also identify the Contractor’s method for ensuring that the provisions of the PCP are met. This PCP shall be submitted to the Engin eer at the Pre- construction Conference. Paving operations shall not begin until the Engineer has approved the PCP . This PCP shall identify and address issues affecting the quality of aggregates incorporated into the concrete mix including but not limited to:
1.Washing aggregates.
2.Inspection at the pits, plants and aggregate storage areas.
3.Base or floor of pits, plants and aggregate storage areas.
4.Inspection of truck beds.
Source: Colorado Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 377–378 of 943.