2211Aggregate Base

2211.1DESCRIPTION

This Work consists of providing, placing, and compacting Aggregate base.

2211.2MATERIALS

2211.3CONSTRUCTION REQUIREMENTS

Forms and the Grading and Base Manual are available on the Grading and Base Website. Unless otherwise designated, test procedures are in the Grading and Base Manual . A General Remove Aggregate base, placed under the Contract that saturates Subgrade soils. Dry and recompact the Subgrade.

Repair Structures damaged by Contractor operations or negligence. Compact and shape the Aggregate base, to the Plan dimensions, before suspending operations. B Contractor Quality Control (QC) Testing Test according to the Schedule of Materials Control. Certify Materials on Form G&B-104. Material placed without certifications is unauthorized Work in accordance with 1512, “Unacceptable and Unauthorized Work.” C Placing and Compacting Ensure the underlying Layer meets QC and QA requirements before the next Layer is placed. Comply with the moisture content requirements per Table 2211.3-1 during compaction. Table 2211.3-1 Moisture Required for Base Compaction Classification Moisture Content (percent by dry weight) Class 3 and 4 (< 50 percent recycled bituminous content) ≥ 7 percent Class 5 and 6 (< 50 percent recycled bituminous content) ≥ 5 percent Classes 3, 4, 5 and 6 (≥ 50 percent recycled bituminous content) 3 percent ≤ moisture content ≤ 7 percent

Place and compact Lifts using Equipment per Table 2211.3-2. Table 2211.3-2 Rollers Required for Compaction Base Lift Thickness/Recycled Bituminous Content Required Rollers ≤ 3 inches / any recycled bituminous content Use Pneumatic rollers only > 3 inches to ≤ 6 inches / recycled bituminous content ≤ 50 percent Use both Vibratory and Pneumatic rollers > 3 inches to ≤ 6 inches / recycled bituminous content > 50 percent Use both Vibratory pad foot roller weighing at least 25,000 pounds and 25 ton Pneumatic roller

Place and compact the base to support traffic, while allowing no greater than 1/2 inch of surface deviation, when measured using a straightedge. Construct the Aggregate Layer to ±0.05 feet of the profile and cross-section as required by the Contract in accordance with 2112, “Subgrade Preparation.” Maintain the compaction, quality, integrity, and properties of the Aggregate Material in each Lift until the next Lift or Layer is placed. Uniformly compact each Lift to meet the requirements of 2211.3D.2.a, “Specified Density Method,” 2211.3D.2.b, “Quality Compaction Method,” 2211.3D.2.c, “Penetration Index Method,” and 2211.3D.2.d, “Light Weight Deflectometer (LWD) Method.”

Correct, blend, and recompact Material represented by failing tests. D Department Quality Assurance (QA) Test according to the Schedule of Materials Control. D.1 Gradation and Aggregate Quality Sampling and Testing Sample according to the Grading and Base Manual. Test the area of corrected Material. Test Materials for the Contract Item Stockpile Aggregates before delivery and stockpiling. D.2 Compaction Test for compaction in the areas with the greatest rutting or deflection, and in an area at least 1 foot from an unconfined edge. Test corrected areas with the greatest rutting or deflection. Test for compaction using Quality Compaction per 2211.3D.2.b, “Quality Compaction Method,” and one of the following methods:

D.2.a Specified Density Method Use the specified density method on virgin Aggregates only. Verify by testing that each Lift is compacted to at least 100 percent of Maximum Density. D.2.b Quality Compaction Method Comply with the requirements of 2106.3G.2, “Quality Compaction.” D.2.c Penetration Index Method Verify that each Lift meets the penetration index and seating value per Table 2211.3-3.

Table 2211.3-3 Penetration Index Method — Maximum Seat and DPI Grading Number * Moisture Contentǁ Maximum Allowable SEAT, [millimeter] Maximum Allowable DPI, [millimeter/blow] Test Layer, [inches]† 3.1 – 3.5 < 5.0 40 10 4 – 6 5.0 – 8.0 40 12 > 8.0 40 16 3.6 – 4.0 < 5.0 40 10 4 – 6 5.0 – 8.0 45 15 > 8.0 55 19 4.1 – 4.5 < 5.0 50 13 5 – 6 5.0 – 8.0 60 17 > 8.0 70 21 4.6 – 5.0 < 5.0 65 15 6 – 12 5.0 – 8.0 75 19 > 8.0 85 23 5.1 – 5.5 < 5.0 85 17 7 – 12 5.0 – 8.0 95 21 > 8.0 105 25 5.6 – 6.0 < 5.0 100 19 8 – 12 5.0 – 8.0 115 24 > 8.0 125 28 * As determined by Form G&B-204. ǁ Percent of dry weight. † If Layer to be placed is thinner than the Test Layer, use 2211.3D.2.b, “Quality Compaction Method.” Note: When recycled bituminous content is ≥ 50 percent, compact to achieve a penetration index value of 10 millimeter and a seating value of 40 millimeter, as determined by Form G&B-205. Note that a moisture test is not required if the Material meets the toughest requirements for the Grading Number. D.2.d Light Weight Deflectometer (LWD) Method Compact the entire Lift to achieve an LWD target value as required per the LWD procedure for 2211, “Aggregate Base” in the Grading and Base Manual. D.3 Test Rolling Observe and document Test rolling, per the Schedule of Materials Control and Contract. D.4 Moisture Testing Test for moisture content in areas that appear least likely to meet Specifications . E Aggregate for the Contract Item Stockpile Aggregate Produce and certify the class of Material required by the Contract using Form G&B-104. Deliver and stockpile certified Material to the designated sites listed in the Contract.

2211.4METHOD OF MEASUREMENT

The Engineer will measure the Aggregate base per 1901, “Measurement of Quantities.” The Engineer will not deduct the mass or volume of water and admixtures. Mass and volume conversion tables are in the Grading and Base Manual .

2211.5BASIS OF PAYMENT

The Contract Unit Price for the accepted quantities of Aggregate base includes the costs of production, testing, placement, watering or drying, and compaction. The Contract Unit Price for the accepted quantities of Stockpile Aggregate includes the costs of production, testing, delivery, and stockpiling at the designated site. The Department will pay for Aggregate base on the basis of the following schedule: Item No. Item Unit

2211.507 Aggregate Base (CV) Class ___ cubic yard

7 Aggregate Base (LV) Class ___ cubic yard

7 Stockpile Aggregate (SV) Class ___ cubic yard

7 Stockpile Aggregate (LV) Class ___ cubic yard

9 Aggregate Base Class ___ ton

9 Stockpile Aggregate Class ___ ton