AG-82B1-S-10-0206--304--Aggregate base spec.pdf

Section 304

DESCRIPTION

304.01 Work

MATERIALS

304.02

Source

304.03 Gradation

304.04 Quali ty

304.05 Additives

304.06 Water

304.07 Mineral Filler or Binder

CONSTRUCTION

304.08 Preparation of Roadbed

304.09 Mixing & Placing

Aggregate Base or Surface Course

This work shall consist of furnishing, hauling, and placing aggregate base or surface course on the subgrade or base or stockpile site approved by the Engineer~ Work may include additive mineral filler, or binder 6e specified in the SPECIAL PROJECT SPECIFICATIONS. Aggregate production shall be by pit-run, grid-rolling, screening, or crushing methods or furnished by the Government, 6S shown in the SCHEDULE OF ITEMS.

Materials shall be obtained from sOUrces or stockpiles SHOWN ON THE DRAWINGS or other approved sources. Grid-rolling shall utilize all suitable material that can be reduced to maximum size as shown in the SCHEDULE OF ITEMS.

Development and utilization of government-furnished sources shall be in accordance with Section 611.

Gracing requirements for crushing or screening operations shall meet the requirements of Subsection 703.06.

No gradation other than maximum size will be required for pit-run or grid-rolled material. After processing on the road, all oversize material shall pe removed from the road and disposed of as SHOWN ON THE DRAWINGS.

All aggregat e except Government'-furni shed stockpi I es or from designated sources shall meet the quality requirements of Subsection 703~06 unless otherwise required in the SPECIAL PROJECT

SPECIFICATIONS.

Chemical additives z if required, shall meet the requirements of the following subsections:

Magnesium Chloride 712.11 Calcium Chloride 712.02 Sodium Chloride 712.02 Hydrated Lime •• .. 712.03

Water development, haUling, ana application shall be in accordance with Section 207.

~"'ineral filler or binder shall be added, as specified in the SPECIAL PROJECT SPECIFICATIONS, to meet quality and/or gradation requirements. Mineral filler or binder shall be added and uniformly blended on the road when pit-run, grid-rolling, or screening methods are used or when aggregate is being furnished by the Government. Mineral filler or binder shall be uniformly blended during crushing when a crusher operation is used.

The roadbed shall be completed in accordance with Section 203 or 306 and approved in writing by the Engineer -before placing base or surface course ..

The contractor may mix the aggregate and any required additives z water, mineral filler, and binder by anyone of the three following methods unless a required method is SHOWN ON THE

DRAWINGS:

(a) Stationary Plant Method. The aggregate shall be mixed with other required materials in an approved mixer. Water shall be aaded during the mixing operation in the amoont necessary to provide the moisture content for compacting to the specified

EM 7720-100LL, page 91 April L 1985

304.10 Compaction

density. After mlxing. the aggregate shall be transported to the jobsite while it contains the proper moisture content and shall be placed on the subgrade or base course by means of an aggregate spreader.

(b) Travel Plant Method. After the aggregate for each layer has been placed with an aggregate spreader or windrow sizing device, it shall be uniformly mi$ed with other required materials by a traveling mixing plant. During mixing , water shall be added to provide the necessary moisture content for compacting~

(c) Road Mix Method. After the aggregate for each layer has been placed, it shall be mixed with other required materials at the required moisture content until the mixture is uniform throughout.

The aggregate sha) I be spread in a uniform layer, with no segregation of size, and to a loose depth that shall have the required thickness when compacted.

If the required compacted depth of any aggregate base or surface course exceeds 6 inches~ it shall be placed in two or more layers of approximately equal thickness.. If the nominal maximum particle size exceeds 3 inches, the aggregate shall be placed in layers that do not exceed twice the maximum size of the aggregate size specified.

Hauling equipment shall be operated over the surface of the previously constructed layer in a dispersed manner to minimize rutting or uneven compaction~

The aggregate shall be compacted by one of the following methods as specified on the SCHEDULE OF ITEMS, compaction A.. Aggregate shall be compacted by operating spreading and haUling equipment over the full width of each layer of the aggregate.

Compaction B. Aggregate shall be moistened or dried to a uniform moisture content suitable for compaction. Rollers meeting the requirements of Subsection 212.02(b). (cl. or (a) shall be operated over the full width of each layer until visual displacement ceases, but not fewer than three complete passes.

compaction C. Each layer of aggregate shall be compacted to a aensity of at least 95 percent of the maximum density, as determined by AASETO T 99, Method C or D.

compaction D. Each layer of aggregate shall be compacted to a density of at least 95 percent of the maximum density, as determined by AASETO T 180, Method C or D.

Compaction E. Each layer of aggregate shall be compacted to at least 95 percent of the target density as determined by the control strip in Subsection 212.03.

compaction F. Pit-run and grid-rolled produced materials shall be visually moist and compacted by operating compaction equipment defined in Subsection 212.02 over the full width of each layer until visual displacement ceases.

The surface of each layer shall be bladed during the compaction operations to remove irregUlarities and produce a smooth, even surface. When a density requirement is specified, the density of each layer will be determined in accordance with ASSHTO T 191, T 205 or T 238, T 217, T 239 or T 255, and T 224.

EM 7720-100LL, page 92 Apri 1 1, 1995

304.11 Stockpiling

304.12 Thickness Requjrements

304.13 (Reserved)

MEASUREMENT

304.14 Method

PAYMENT

304.15 Basis

If shown in the SCHEDULE OF ITEMS or if the contractor elects to produce and stockpile aggregates prior to placement# the aggregates shall be handled and stockpiled in accordance with the requjrements of Subsection 105.0]~ Stockpile sites shall be at locations as SHO\VN ON THE DRAWINGS or approved by the Engineer.

Clearing and grubbing of stockpile sites if required, shall be inL accordance with Section 201.

The thickness of the compacted nominal aggregate shall not vary more than 1/2 inch for aggregates with a maximum particle size of I inch or less, nor more than 1 inch for aggregates with a nominal maximum particle size greater than 1 lnch from 'the thickness SHOWN ON THE DRAWINGS. The compacted thickness shall not be consistently above or below the specified thickness. "

The method of measurement as described in Section 106 will be DESIGNATED in the SCHEDULE OF ITEMS.

Aggregate quantjties will include mineral filler or binder.

The accepted quantities will be paid for at the contract unit price for each pay item .~".n In the SCHEDULE OF ITEMS.

Pay Item Pay Uni t

304(01) pit RUn Aggregate, Haximum Size compaction . . C.Y •

304(03) Pit Run Aggregate; Maximum Size compaction L.S.

304(04) Grid-Rollea Aggregate, Maximum Size compaction c.y.

304(05) Gri a-Roll ea Aggregate, liiaxi mum Size compaction TON

304(06) Grid-Rolled Aggregate, Maximum Size Compaction L. S.

304(07) Screened Aggregate, Grading compaction C.y.

304(08) Screened Aggregate, Grading Compaction TON

304(09) screened Aggregate, Grading Compaction L.S.

304 (10) Crushed Aggregate, Type Grading compaction _______

304(11) Crushed Aggregate, Type Grading , compaction TON

304(12) cruehea Aggregate. Type ~~=-_____ Grading compaction _______ L .. S.

EM 7720-100LL. page 93 April 1. 1985

304(13) Furnishing and Applying Calcium Chloride, Type · . · . . TON

304(14) Furnishing and Applying Hydrated Lime TON

304(15) Furnishing and Applying Sodium Chloride TON

304(16) Placing Aggregate, Compaction C.Y.

304 (17) Placing Aggregate, Compaction TON

304 (18) Placing Aggregate, Compaction L.S.

304(19) Furnishing and Applying Magnesium Chloride TON

304(20) Furni shi ng and Applying Magnesium Chloride M. GALS.

304(21) Stockpiled Aggregate, Type Grading . · . · . c.y .

304(22) Stockpiled Aggregate, Type Grading . · · . . . . TON

When mat the note erials are produced and furnished "Government furnished materials" by the Forest will be added

Se to rvice, the description of the pay item. This applies only to pay items 304(16). 304(17) and 304(18).

EM 7720-100LL, page 94 Apr il 1, 1985'"

306.01

Section 306 • Reconditioning Existing Road

DESCRIPTION

CONSTRUCTION

306.02 Performance

This work shall consist of reconditioning the traveled way and shoulders of an existing roadi cleaning ditches and culverts, including in1ets and outlets: removing slide material: scarifying and shaping the traveled way and shoulders, parking areas, turnouts, and approach road connections.

The traveled way and shoulders shall be scarified and shaped at locations and to the depth and width SHOWN ON THE DRAWINGS. Any rock larger than 4 inches in its greatest dimension brought to the surface during scarification shall be removed, except as provided below.

When a base or surface course is required, provisions of (a) or

(b) shall apply,

(a) ROCKS larger than 4 inches that do not protrude above the existing surface or the subgrade more than one-third of the depth of the base Or surface course or 3 inches, whichever is less, may be left in place.

(b) Rocks with exposed surface area exceeding 2 square feet shall be removed to at least 6 inches below subgrade.

Excess materials removed shall be disposed of in areas SHOWN ON

THE DRAWINGS.

Existing bituminous surfaces, SHOWN O~ THE DRAWINGS, shall be scarified and pulverized until all lumps are reduced to the maximum size SHOWN O~ THE DRAWINGS. The bituminous pulverized aggregate shall be incorporated into the traveled way and shoulders ..

The traveled way and shoulders of intersecting roads shall be similarly treated to provide a smooth transition for the distance

SHOWN ON THE DRAWINGS.

The ditches shall be graded to the typical sections and at the locations SHOWN ON THE DRAWlNGS. Culverts shall be cleaned to drain ..

Excess and unsuitable materials removed from the roadbed, slides, culverts, and ditches shall be disposed of as SHOWN ON THE

DRAWINGS.

The traveled way and shoulders shall be shaped after scarification and compacted by one of the following, as shown in the SCHEDULE OF

ITEMS.

Compaction A. By operating equipment over full width.

compaction B. 9S percent of AASHTO T 99, Method C or D.

compaction c. 95 percent of AASHTO T ISO, Method C or 0 ..

compaction D~ Subsection 203.15, Method 3

When compaction B or C is spe~ified, the in-place density of the material shall be determined In accordance with AASHTO T 191, T 205, or T 23B: T 217, T 239, or T 255: and T 224.

(Reserved)

EM 7720-100LL. page 95 April 1, 1985

306.03

MEASUREMENT

306.04 The method of measurement, as described in Section 106, will be Method DESIGNATED in the SCHEDULE OF ITEMS.

Removal of slide material in excess of ]0 cubic yards per station will be measured as provided in Section 203.

PAYMENT

306.05 The accepted quantities will be paid for at the contract unit Basis price for each pay item shown in the SCHEDULE OF ITEMS.

Payment will be made under:

Pay Item Pal Unit

306(01) Reconditioning of Roadbed, Compaction__ MI.

306(02) Reeohdi tioning of Roadbed t Compaction__• STA.

306(03) Reconditioning of Roadbed, Compaction__ L .. S ..

EM 7720-100LL, page 96 April 1, 1985