Section 304 — Full Depth Reclamation

Description

304.01This work consists of pulverizing an existing pavement and base in-place, adding crushed aggregate if required, mixing this material with water, and shaping and compacting the mix to produce a base.

Material

304.02Conform to the following Subsections: Crushed aggregate 703.06 Water for construc tion 725.01(c)

Construction Requirements

304.03General. Maintain the existing cross-section or construct to proposed cross-section. Protect manholes, valve covers, and other buried facilities from damage.

304.04Adding Crushed Aggregate. Add crushed aggregate as required to bring the finished surface to the established line, grade, and cross -section.

304.05Pulverizing. Provide a road reclaimer that is:

(a)Self-propelled;

(b)Specifically manufactured for in -place reclamation;

(c)Capable of reducing the existing material to the required size;

(d)Equipped with at least an 8-foot cutting width;

(e)Equipped with standard automatic depth controls adjustable in increments of ½ inch; and

(f)Equipped with sufficient horsepower to constantly pulverize to the required depth in a single pass. Pulverize the existing roadway material using the reclaimer until 100 percent passes the 1 ½-inch sieve. Reprocess or remove larger particles and dispose of them according to Subsection 203.07.

304.06Mixing and Spreading. Add water as necessary to adjust the moisture content of the mixture to within 2 percent of the optimum for compaction. Mix to produce a homogenous full depth mixture. Spread the mixture uniformly to provide a final compacted shape according to the established line, grade, and cross- section.

304.07Compacting and Finishing. If no compaction method is specified, use either method. Finish the surface according to Subsection 301.06. 250 (a) Method 1. Compact full depth reclamation (FDR) material full width according to Subsection 204.11(a) .

(b)Method 2. Collect representative samples of the pavement and base from the project. Process and blend the se materials to achieve a gradation representative of the in -place pulverized material. Compact FDR material according to Subsection 301.05.

304.08Maintenance. Maintain the FDR material according to Subsection 301.07.

304.09Acceptance. See Table 304-1 for sampling, testing, and acceptance requirements. Crushed aggregate will be evaluated under Subsections 106.02 and 106.03. Construction of full depth reclamation will be evaluated under Subsections 106.02 and 106.04.

Measurement

304.10Measure the Section 304 pay items listed in the bid schedule according to Subsection 109.02 .

Payment

304.11The accepted quantities will be paid at the contract price per unit of measurement for the Section 304 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 . Table 304-1 Sampling, Testing, and Acceptance Requirements

Material or

Product Type of

Acceptance

(Subsection) Characteristic Category Test Methods

Specifications Sampling

Frequency Point of

Sampling Split

Sample Reporting

Time Remarks

Pre-Production (reclaimed material)

FDR material Measured &

tested for conformance (106.04) Moisture - density – AASHTO T 180, Method D(1) 1 sample at production start- up location Production start- up location Yes Before production For Method 2 compaction only

Production

FDR

material Measured & tested for conformance (106.04 ) Moisture - density – AASHTO T 180, Method D(1) 1 per change in material Behind reclaimer before compaction Yes Before using in work – Density – AASHTO T 310 1 per 2000 yd2 In-place after compaction No End of shift For Method 2 compaction only

Process

control (153.03 ) Moisture content (in-place) – AASHTO T 255 or other approved methods 1 per 3500 yd2 minimum FDR material after compaction No Upon completion of test − Gradation – AASHTO T 27 " Behind reclaimer before compaction " " Minus 1½-in sieve requirement only

Finished Product

Finished

FDR

material Measured & tested for conformance (106.04 ) Surface tolerance & grade – Subsection

301.06As directed Completed

FDR

surface No Before placement of next layer or as requested −

(1)At least 5 points per proctor.