301SOIL, SOIL AGGREGATE, AND AGGREGATE,

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at other points as designated. The finished surface shall not vary more than 3/8 of an inch {10 mm} from the required section measured with a template placed at right angles to the roadbed centerline. The template shall be of a rigid frame adjustable metal type, accurately set, and at least as long as the width of base layer being checked up to 24 feet {7.2 m}. Additional widths may be checked by the use of string and Engineer's level. The Contractor shall furnish template, string, and necessary personnel to handle same under the direction of the Engineer. Where a Permeable Asphalt Treated Base (PATB) layer is to be placed (Pay Item 327-E), the finished base layer elevations shall not vary from design by more than 0.03 feet {10 mm} based on rod and level survey readings taken at a minimum of five locations across each lane (edge, outer wheel path, midlane, inner wheel path, and inside edge of lane) at longitudinal intervals not greater than 50 feet {15 m}. Surface irregularities shall not exceed 1/4 inch {7 mm} between two points longitudinally or transversely using a 10-foot {3 m} straightedge.

Testing for compliance will be made as specified in Subarticle 301.05(a) except that a layer with a cement additive will require the pretesting of the blended components prior to the addition of the cement additive on the primary belt at the mixing plant. The gradation of each layer will be checked at intervals as currently scheduled by the Department to determine compliance with the material specifications. Material falling outside of the specified bands of the general composition table shall be evaluated in accordance with the following: for each failing test, the price reduction will be five percent plus one percent for each percent for which the material failed to meet the required specifications. This applies to each sieve, percent clay, liquid limit (LL), or plasticity index (PI) requirement. These percentages are cumulative and apply to all material represented by that sample. If the resulting reduced unit price is less than 80% of the original unit price, the contractor will be given the option of modifying the in place material or removing and replacing the material. In either case, the gradation of the material will be re-tested for compliance with the material specifications. The density of each layer will be checked at intervals as currently scheduled by the Department to verify compliance with specification requirements. Density requirements are specified in Section 306.

The thickness of each layer will be checked at intervals as currently scheduled by the Department and at closer intervals if necessary to determine the limits of any section found to be outside of the tolerance limits.  For a layer placed under a "square yard " {"square meter"} item, the compacted thickness of the layer shall not be more than 1/2 of an inch {13 mm} less nor 1 inch {25 mm} more than the thickness specified on the plans or directed. A thickness greater than the 1 inch {25 mm} tolerance may be accepted if uniform over a sufficient length to not materially affect the riding surface or reduce any required clearances and is within surface smoothness tolerances specified in Subarticle 301.05(b).  For a layer placed under a "cubic yard" {"cubic meter"} item, the compacted thickness of the layer shall not exceed eight percent of each layer, plus or minus, of the designated thickness. Excess thickness above the eight percent noted above may be permitted to remain in place provided the riding surface is not affected and any required clearances are maintained, The excess material above the eight percent tolerance allowed will be deducted from the pay quantities.  If the base layer contains cement, areas below required thickness or elevation shall be corrected by increasing the thickness of the next layer; or for the top layer, the surface may be brought to proper elevation and thickness with layers of bituminous plant mix of appropriate gradation where the pavement is to be a bituminous type. These leveling layers shall be placed ahead of a plant mix pavement layer or after a liquid surface treatment layer, if any. These layers shall be placed without additional compensation, or the Contractor may at his option remove and replace the deficient areas at his own expense. Low areas in the subgrade under concrete pavement shall be corrected as specified under Subarticle 450.03(c).

The widths shown on the plans, or directed, shall be the widths used for determining the area for pay purposes of square yard {square meter} layers. Widths in excess of the designated width may be SOIL, SOIL AGGREGATE, AND AGGREGATE, BASE AND SUBBASES 167

acceptable if not detrimental to the appearance or design of the project; however, no deviation in excess of 0.3 feet {90 mm} less than the designated dimension for each side of a roadway will be acceptable.

301.06Maintenance of the Work

Each base layer shall be maintained as provided herein without extra compensation until it is covered by a succeeding layer or acceptance of the contract. The surface shall be kept free of ruts, ridges, holes, and substantially true to profile, grade, and cross-section. Each base layer must have the required density and moisture at the time it is covered by another layer. However, maintenance requirements for moisture will be waived for Crushed Aggregate Base after the layer has been properly compacted with proper moisture content. No layer of base shall be covered by another layer or primed until it has been approved by the Engineer. Special attention is directed to the fact that lime or cement treated bases require special care to ensure proper curing. Daily watering, rolling, or maintenance of curing material is considered an integral part of the work until the treated layer is covered by another layer or completion of the contract. The Engineer may re-test a primed base layer where he suspects that it does not have the required density and moisture. All areas found deficient shall be corrected by the Contractor, at his expense, prior to the placement of the next overlying layer. It shall be the Contractor's responsibility to protect the base from damage and to protect the prime from being picked up or damaged by traffic and to replace promptly any base or prime so damaged.

301.07Method of Measurement

Measurement of base materials will be made in accordance with the particular item provided in the contract in accordance with the following:

Measurement by the square yard {square meter} will be made of a completed accepted layer of base constructed to the thickness and cross section shown on the plans or directed. All calculations of areas for payment shall be based on computations made to the nearest 0.1 of a square yard {0.1 square meter}. The length will be measured along the surface of the layer at the centerline of the roadbed to the nearest 0.1 of a foot {0.1 m}. For transitions in thickness, the thickness will be measured to the midpoint of the transition. The width will be the top surface width of the layer as specified on the plans or directed. Each layer of crossovers, turnouts, and the like will be measured in square yards {square meters} by lengths and widths along the top surface of the layer involved. No measurement will be made for the necessary bevel or wedge of material shown on the plans along the edge of each layer. Where the Engineer directs in writing that the thickness of a layer be changed from that specified on the plans, the accepted layer shall have an adjusted unit price derived by arriving at an increase or decrease to the contract unit price bid in direct proportion to the increased or decreased thickness of the adjusted layer. No payment shall be made for a layer completely eliminated.

Measurement by the cubic yard {cubic meter} will be the loose volume of the material measured in the hauling vehicle at the point of use.

Measurement by the ton {metric ton} will be the quantity of material placed in a completed accepted layer of base constructed to the thickness and cross section shown on the plans or directed and measured in accordance with the provisions of Subarticle 109.01(h).

Measurement of cement will be by the ton {metric ton} for cement actually used in the work as directed, except cement used to repair or replace defective work.

Measurement of lime will be by the ton {metric ton} for lime actually used in the work as directed, except for lime used to repair or replace defective work. FULL DEPTH RECLAMATION WITH PORTLAND CEMENT 168

301.08Basis of Payment

material, except cement and lime, in whatever proportions necessary to produce and place the base material, in accordance with the requirements specified, complete in place on the roadbed. It includes all costs for procurement, operations, compaction, watering, equipment, tools, labor, and incidentals necessary to complete the work. Cement and lime used as directed, in completed and accepted layers, will be the only other item for which separate payment will be made under this Section.

ton {metric ton}. This payment shall be payment in full for furnishing and incorporating the cement and lime into the base material.

When layers failing to meet the gradation band requirements are permitted to remain in place as specified in Subarticle 301.05(c), unit price adjustments will be made as specified therein.

301-A * t Course, Type tt , ** , ttt Mixed, inches {mm} Compacted Thickness - per square yard {square meter} 301-B * t Course, Type tt , ** , ttt Mixed, - per cubic yard {cubic meter} 301-C Cement - per ton {metric ton} 301-D Lime - per ton {metric ton} 301-E * t Course, Type tt , ** , ttt Mixed, - per ton {metric ton} * Base Classification (Selected Materials, etc., Granular Soil, Soil Aggregate, Processed Reef Shell, Crushed Aggregate) t Base or Subbase tt Type ** Insert "with cement or lime additive," if required ttt Road, Yard, or Plant FULL DEPTH RECLAMATION WITH PORTLAND CEMENT

302.01Description

Full Depth Reclamation with Portland cement shall consist of pulverizing and mixing the in place existing materials as shown in the plans with Portland cement and water to produce a uniform mixture and then compacting the mixture to serve as a base course for pavement.

302.02Materials

Cement shall meet the requirements given in Section 815 "Cement" for Type I, Type IL, Type IP, Type IS or Type II Portland Cement.

Water shall meet the requirements given in Section 807.

302.03Construction Requirements

The Contractor shall establish offset reference points before beginning of construction so that the original alignment of the roadway (centerlines, edges of pavement, etc.) will be restored during construction.

A "Job Mix Design" is a listing of all components of the mixture required for the full depth reclamation. If a Job Mix Design is shown on the plans the Contractor shall use that mix design for the full depth reclamation work. If a Job Mix Design is not shown on the plans the Contractor shall determine FULL DEPTH RECLAMATION WITH PORTLAND CEMENT 169

the composition of the Job Mix Design and submit it to the Engineer for review. The Engineer will forward the proposed Job Mix Design to the Materials and Tests Engineer for approval. Job Mix Designs shown on the plans and submitted Job Mix Designs approved by the Materials and Tests Engineer shall not be changed without written approval of the Engineer. The Contractor shall submit the proposed changes to the Engineer with an analysis of the need for the change. The Engineer will forward the proposed change to the Materials and Tests Engineer for approval.

The Contractor shall submit a proposed Job Mix Design no later than 21 Calendar Days after the date of Notice to Proceed. The Department will be allowed 21 Calendar Days to complete the verification and approval of the Job Mix design. The composition of a Job Mix Design submitted by the Contractor shall be established in accordance with the requirements given in ALDOT 416, "Laboratory Design of Soil-Cement and Full-Depth Reclamation Mixes". More than one Job Mix Design may be required due to the variability of the existing roadbed materials. Each proposed Job Mix Design and samples of the roadbed materials for each design shall be submitted for evaluation and approval. The Contractor shall submit five copies of each proposed Job Mix Design to the Materials and Tests Engineer for approval. All of the requirements given in ALDOT 416 shall be addressed in the Contractor's submittal of the Job Mix Designs. Construction of full depth reclamation shall not begin until the Engineer returns a copy of each approved Job Mix Design to the Contractor. The Contractor shall submit 75 pounds of composite representative samples of the existing roadbed materials and 5 pounds of the cement proposed for each proposed Job Mix Design. The Contractor shall sample the existing roadbed materials at least every 1000 feet along the roadbed. Samples shall be obtained from all layers to be reclaimed. These materials shall be submitted to the Materials and Tests Engineer with the Job Mix Design submittal.

The Contractor shall provide and maintain a quality control system to provide assurance that the full depth reclamation is constructed in accordance with the contract requirements. The Contractor shall submit six copies of a "Quality Control Plan for Full Depth Reclamation" to the Engineer for review prior to the preconstruction conference. This plan shall include the following minimum requirements:

placement.

the reclaimed material.

of pulverization of the reclaimed material during mixing.

during production.

of the in-place full depth reclamation.

failures, and poor workmanship as determined by the Engineer

requirements.

The Contractor shall present weekly documentation to the Engineer that the work is being monitored in accordance with the requirements given in the quality control plan. The Engineer will not approve the Contractor's "Quality Control Plan for Full Depth Reclamation" but will review it for completeness. An incomplete plan will be returned to the Contractor. Construction shall not begin until the Engineer returns one copy of the plan to the Contractor and informs the Contractor in writing that no further information will be required. The Engineer will stop the production of full depth reclamation if the Contractor does not perform the work in accordance with the submitted plan.

All full depth reclamation operations including pulverizing, mixing, compaction, finishing, and curing shall be continuous and completed during daylight hours. FULL DEPTH RECLAMATION WITH PORTLAND CEMENT 170

No full depth reclamation shall be constructed when the ambient temperature is below 40 ⁰F without written permission of the Engineer. Working on full depth reclamation construction will not be allowed when it is raining or the possibility or rain is imminent. The Engineer will decide base on weather reports if the possibility of rain exists.

The Engineer will prohibit the use of any piece of equipment that will not, or does not, produce acceptable results. The Contractor shall not begin the distribution of the cement until the Engineer informs the Contractor that the proposed equipment and method of monitoring cement placement is adequately described in the quality control plan. Equipment shall include a mechanical cement spreader of a type that has an adjustable rate of flow and will distribute the cement uniformly at the required rate in one pass. Pneumatic distribution of cement is prohibited. A mechanical mixer shall be used that is capable of pulverizing and mixing the existing pavement, base and sub-grade to the required depth. The mechanical mixer shall be capable of pulverizing the material so that 100 % passes a 2-inch sieve. The mixer shall have a metered water system for adding water directly into the mixing chamber. Water shall not be applied from equipment that is not a part of the mixer.

Except by written permission of the Engineer, the length of roadbed pulverized at any time shall not exceed the length that can be completely pulverized, mixed and compacted in the same working day.

The width and depth of the required pulverizing and mixing will be shown on the plans. The depth of pulverizing shall be controlled to ensure that the finished thickness will be within the required tolerance limits. The pulverizing and mixing shall break up the existing roadbed to the extent that 100 % by weight passes a 3-inch sieve, a minimum of 95 % passes a 2-inch sieve and a minimum of 50 % passes the No. 4 sieve. The moisture content shall be maintained within ± 2 % of the theoretical optimum moisture content unless approved otherwise by the Engineer. The Engineer will check the gradation at least once for each 2000 linear feet or fraction thereof of each lane. Preliminary pulverization and mixing of the roadbed materials will be allowed prior to final pulverization and mixing of the roadbed materials and cement to ensure uniformity of the mixture. The Engineer will monitor the pulverization in accordance with BMT-80, “Rate of Spread and Pulverization of Cement Stabilized Soil”.

Spreading of the cement shall be done to produce a uniform distribution. The amount of cement placed shall not vary more than 5 % by weight from the approved Job Mix Design. Cement dust shall be controlled by the Contractor so that dust is kept within the confines of the construction limits. Spreading of the cement when the wind or other weather conditions are unfavorable will not be permitted. Spreading of the cement by motor grader will not be acceptable. Cement shall be applied in a limited area so that all the operations including compaction, finishing, and curing can be continuous and completed in daylight hours, within three hours of the application of the cement. Only the equipment that is used in spreading and mixing will be allowed to pass over the spread cement before it is mixed into the existing materials. Cement that has been displaced shall be replaced before mixing is started.

Water shall be mixed into the mixture of cement and pulverized roadbed materials. The addition of water and the mixing shall be completed in one continuous pass. The mixture of the water, cement, and pulverized roadbed materials shall be within the tolerance limits of theoretical optimum moisture content and shall be suitable for immediate compaction without further mixing or grading. A gage or gages shall be provided to allow the continuous monitoring of the amount of water that is applied.