302.01 Description
This work consists of processing the existing plant mix surfacing with existing crushed aggregate course, additional crushed aggregate course, or combination of these to restore the roadway section.
302.02 Materials
Furnish crushed aggregate course in accordance with Subsection 701.02.1 and one of the following subsections: Crushed Aggregate Course Type “A” Grade 5 ........ 701.02.4 Crushed Aggregate Course Type “A” Grade 6 ........ 701.02.4 Crushed Aggregate Course Type “A” Grade 7 ........ 701.02.4
302.03 Construction Requirements
302.03.1 Pulverization
Pulverize the bituminous surfacing to the depth(s) specified in the contract. Pulverize the existing material so that 100% by weight passes a 2-inch (50 mm) sieve.
302.03.2 Equipment
Equipment used to pulverize the existing surfacing must not reduce the aggregate size in the existing surfacing.
302.03.3 Mixing
Add crushed aggregate course as necessary to construct the roadway to the specified typical section and profile grade. Uniformly mix the pulverized material and crushed aggregate course by pugmilling or by using the pulverization equipment.
302.03.4 Compaction
Compact the pulverized mixture in maximum 8-inch (200 mm) compacted lifts to 98% of the target density. The target density will be determined by one of the following methods:
A.Pugmill Mixing. MT 230 determines maximum density when the pulverized plant mix and crushed aggregate course are blended at a constant ratio by pugmill. The initial target density is the average of the maximum density of at least 2 tests on samples representing the material to be compacted.
B.In-place Mixing. MT 219 determines maximum density when in-place pulverized plant mix and crushed aggregate course mixtures are combined at varying ratios. The Project Manager will determine target densities and moisture corrections. A new target density will be established if the ratio of pulverized material and crushed aggregate course change by more than 20% or the Project Manager determines the pulverized material characteristics or site conditions change.
302.03.5 Testing and Acceptance
Each lift of pulverized mixture material will be divided into 2,000-foot long (610 m) sections. The in-place dry density of each lift will be determined within each section at 10 randomly selected locations. The average of the 10 tests must exceed 98% of the target density with no more than 2 out of the 10 tests being less than 98% of the target density. Be responsible for controlling compaction and all necessary quality control testing. Notify the Project Manager when compaction is complete on a section so it can be tested. 302 – BITUMINOUS PAVEMENT PULVERIZATION 2020 EDITION V5.1 302-2 Re-compact sections not meeting density requirements. Re-compacted sections will be tested at 10 new random locations. Compaction and testing will continue until the section meets density requirements.
302.04 Method of Measurement
302.04.1 Aggregate
Virgin crushed aggregate course is measured by the ton (MT) in accordance with Subsection
301.03 2(C) or by the cubic yard (m3).
302.04.2 Pavement Pulverization
Pavement pulverization is measured by the square yard (m2) based on the bottom width of the pulverized material. The contract unit price may be adjusted if the Project Manager issues a written order for the following:
1.The average pavement depth varies by more than 0.10-foot (30 mm) from plan; or
2.Increase or decrease to the pulverization depth.
302.05 Basis of Payment
Payment for the completed and accepted quantities is made under the following: Pay Item Pay Unit Crushed Aggregate Course Ton (MT) or Cubic Yard (m3) Pavement Pulverization Square Yard (m2)
Referenced in this section
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Source: Standard Specifications for Road and Bridge Construction, 2020 (v5.1) Edition. Pages 213–214 of 611. View official source ↗