306RECLAIMED STABILIZED BASE

New Hampshire Department of Transportation Standard Specifications – 2016 Description

1.1This work shall consist of scarifying, if necessary, and pulverizing the existing pavement together with a base course material.

It may require removal and rehandling and the addition of other materials as shown on the plans or as ordered. Materials

2.1General.

2.1.1 The material shall consist of the existing pavement blended with the underlying gravel and/or additional stone as required. Reclaimed stabilized base shall have a minimum bitumen content of 1.5 percent and conform to the following gradation: Sieve Size Percent Passing By Weight 3” 100 1-1/2” 80 - 100 3/4” 55 - 90 No. 4 40 - 70 2.1.2 Additional stone as required to meet the above gradation shall meet the requirements of 304.2.1.1 and the requirements of Section 703 Table 703-1 – Required Grading, Grading Coarse Aggregates, #467 for 1-1/2” stone. 2.1.3 Additional asphalt shall meet the requirements of Section 702, as specified. Construction Requirements

3.1The reclaimed stabilized base shall be processed, using approved reclaimers. Equipment such as a milling machine or a rock

crushing plant will not be permitted. Reclaiming equipment shall be equipped with a gauge to show depth of material being processed.

3.2The existing pavement shall be pulverized together with the underlying base course material. The pulverizing operation shall

blend the existing pavement and base course into a homogeneous mass, using the bitumen contained in the pavement as a stabilizer. When stone for Reclaimed Stabilized Base [Item 306.36] is included in the Contract or is ordered, the stone shall be applied to the reclaimed surface and re-blended with the previously reclaimed material. The quantity of additional stone mixed with the reclaimed existing pavement shall be adjusted as necessary to meet the material specification of 2.1.1.

3.3Prior to compaction water shall be applied, for the purpose of dust control and to ensure proper compaction. Water may be

added during fine grading to improve workability. Additional water shall be applied prior to compaction and may require mixi ng to blend with reclaimed material to ensure adequate compaction.

3.4Compaction shall be accomplished by successive passes of a vibratory sheep's foot or pad foot roller of at least 50,000 lb. of

dynamic force. Final rolling shall be accomplished by a smooth steel wheel vibratory roller of at least 27,000 lb. of dynamic force. Density testing shall conform to 304.3.8.

3.5Gradation shall be determined on the total sample prior to extraction by AASHTO T 27. Bitumen content shall be determined

on that portion of the sample which passes a 3/4 ” sieve by AASHTO T 164. The Contractor shall make provisions for an appropriate testing facility for Department personnel to perform the test, AASHTO T 164, as needed.

3.6Prior to placing the processed material, the roadbed shall be shaped to the specified crown and grade. If the existing roadbed

is disturbed, it shall be compacted in accordance with 304.3.6.

3.7Excess material, unless specified otherwise, shall become the property of the Contractor.

3.8Care shall be exercised to save all pavement for reclaiming if trenches are constructed prior to processing.

3.9If the reclaimed stabilized base is not sufficient to complete the project, additional crushed gravel sha ll be used to make up

the deficiency.

3.10Reclaimed stabilized base specified to be removed and rehandled may be processed in the roadway or off site. The reclaimed

stabilized base shall be returned to the highway and placed on the prepared roadbed to th e depths specified.

3.11Additional asphalt may be required to obtain the minimum 1.5 percent bitumen content.

3.11.1 The asphalt shall be applied by a liquid distributor or other approved method, at a rate specified by the Engineer. The asphalt shall be blended with the reclaimed stabilized base using approved mixing equipment. 3.11.2 Asphalt shall not be applied when rain is threatening, during rain storms, or when the air temperature is below 50°F. New Hampshire Department of Transportation Standard Specifications – 2016 3.11.3 Prior to the addition of asphalt, the moisture c ontent of the reclaimed stabilized base shall be adjusted by aerating or adding water if required.

3.12If additional stone is used it shall be blended with the reclaimed material using an approved reclaimer.

Method of Measurement

4.1Reclaimed stabilized base, of the depth specified will not be measured, but shall be the square yard final pay quantity for

material within the limits shown on the plans.

4.2Additional stone will be measured by the ton in accordance with 109.01. The additional pass with the reclaimer to blend the

material will not be measured.

4.3Asphalt will be measured by the ton or pound in accordance with 109.01.

Basis of Payment

5.1Reclaimed stabilized base, of the depth specified is a final pay quantity item and will be paid for at the Contract unit price

per square yard, complete in place in accordance with 109.11. 5.1.1 Removal and rehandling or removal of excess material shall be subsidiary to reclaimed stabilized base.

5.2The accepted quantity of stone will be paid for at the Contract unit price per ton, complete in place. The additional pass with

the reclaimer to blend the material shall be subsidiary.

5.3The accepted quantities of asphalt will be paid for at the Contract unit price per ton or pound, complete in place.

Pay items and units:

306.106 Reclaimed Stabilized Base Processed in Place, 6” Deep (F) Square Yard

8 Reclaimed Stabilized Base Processed in Place, 8” Deep (F) Square Yard

306.110 Reclaimed Stabilized Base Processed in Place, 10” Deep (F) Square Yard

2 Reclaimed Stabilized Base Processed in Place, 12” Deep (F) Square Yard

306.206 Reclaimed Stabilized Base Removed and Rehandled, 6” Deep (F) Square Yard

8 Reclaimed Stabilized Base Removed and Rehandled, 8” Deep (F) Square Yard

306.210 Reclaimed Stabilized Base Removed and Rehandled, 10” Deep (F) Square Yard

2 Reclaimed Stabilized Base Removed and Rehandled, 12” Deep (F) Square Yard

306.31Asphalt For Reclaimed Stabilized Base Pound

306.32Asphalt For Reclaimed Stabilized Base Ton

306.36Stone for Reclaimed Stabilized Base Ton

New Hampshire Department of Transportation Standard Specifications – 2016

Description

These specifications include general requirements that are applicable to all types of plant mix asphalt pavements

irrespective of the gradation of aggregate, kind and amount of asphalt binder, or pavement use. Deviations from these general requirements will be indicated in the specific requirements for each type.

1.2These specifications provide for the use of reclaimed asphalt pavement material in certain specified mixtures.

1.3This work shall consist of the construction of one or more courses of asphalt pavement constructed on a prepared foundation

in accordance with these specifications and the specific requirements of the type under Contract. The work shall be in reasonably close conformance with the lines, grades, thickness, and typical cross-sections shown on the plans, within the tolerances specified or established by the Engineer.

1.4These specifications provide for both method and quality control/quality assurance (QC/QA) specification work. Sections

under the heading Performance Requirements (QC/QA) are applicable on QC/QA items only. Sections marked Quality Control (QC/QA) Method are applicable for non -QC/QA items and those portions of QC/QA items that are not measured for pay adjustment. All sections under the heading General are for use with all items.

1.5Performance Requirements (QC/QA).

1.5.1 The work will be accepted under Performance Requirements (QC/QA) provisions in accordance with these Specifications and the applicable requirements of Section 106.

reconstruction projects in rural areas or on reclamation projects in rural areas.

with maintenance of traffic phasing, projects with intersecting streets, projects with pavement tapers, bridge projects with short approach paving, projects where there are many manhole/drainage structures or driveways (generally in urban and suburban areas). QUALITY/PAY FACTORS TO BE ASSESSED Tier 1 Tier 2 Asphalt Content and Gradation X X Cross Slope X Density X X Ride Quality X Thickness X Materials

Aggregates – General.

2.1.1 Aggregates shall be uniform quality durable pebbles or fragments of rock, with or without sand or other inert finely divided mineral aggregate. All material shall be free from clay balls, organic matter, deleteri ous substances, and an excess of flat or elongated pieces as specified in ASTM D 4791. Washing will not be required, except when aggregate plants do not produce clean material by the dry process method. In order to obtain uniformity of color and appearance of the pavement throughout the project, the aggregate for all the wearing courses shall be obtained from the same material source. Sufficien t material shall be on hand prior to starting daily operations to ensure uninterrupted processing for the working day. 2.1.2 Fine aggregate shall consist of sound durable particles of sand, crushed stone, or a combination thereof. Fine aggregate shall be free from clay balls and injurious amounts of organic matter. Stone screening shall be produced from ston e at least equal in quality to that specified for coarse aggregate. 2.1.2.1 Fine aggregate may be 100 percent manufactured aggregate. 2.1.3 Mineral filler shall conform to AASHTO M 17 except that 100 percent shall pass the No 16 sieve, waiving the requirement for the No. 30 sieve. 2.1.4 Coarse aggregate shall be crushed stone or crushed gravel and shall have a percentage of wear as determined by AASHTO T 96 of not more than 45 percent unless otherwise specified by Contract item. In each stockpile, not less than 50 percent by weight of the particles retained on the No. 4 sieve shall have at least one fractured face. Stockpiles consisting of a