Section 308 Section 308 the Contractor’s decision as to the method used shall be final.
308.05 Basis of Payment . Cement will be paid for at the contract unit price per ton.
Soil-cement-water mixing will be paid for at the contract unit price per square yard or ton, as specified. The prices thus paid shall be full compensation for completing the work. Bituminous curing seal, measured as prescribed above, will be paid for at the contract unit price per gallon, which price shall be full compensation for furnishing, applying and reapplying if needed, protecting, maintaining; and all tools, equipment, labor and incidentals necessary to complete the work. Payment will be made under: 308-A: Cement - per ton 308-B: Soil-Cement-Water Mixing, Type* Mixers, Component - per square yard or ton** 308-S: Bituminous Curing Seal - per gallon * Optional, Single Pass, Multiple Pass, Traveling Plant, or Central Plant. ** Central Plant Mixers Only. SECTION 310 - MECHANICALLY STABILIZED COURSES
310.01 Description . This work consists of constructing one or more courses by the
incorporation of stabilizer aggregate in a ccordance with these specifications and in reasonably close conformity with the lines, grades, and typical cross sections shown on the plans or established by the Engineer.
310.02 Materials .
310.02.1 Materials to be Stabilized . The material to be stabilized shall consist of base
material placed under this contract or under a previous contract. General conditions governing the use of materials shall be as set out in Section 106.
310.02.2 Stabilizer Aggregates . Stabilizer aggregates of the kind and size specified
shall meet the requirements of Subsection 703.20.
310.02.3 Composite Mixture . The composite mixture of mechanically stabilized
courses shall be in accordance with the requirements and provisions of Subsection
703.08 In order to obtain the desirable composite mixture, the Engineer may vary the quantity of stabilizer aggregate shown on the plans by as much as 25 percent.
Acceptance of the composite mixture for co nformance to the specification requirements for gradation, liquid limit and plasticity index shall be based on samples obtained from the roadway. A minimum of one random sample shall be obtained for each 1000 linear feet of 24 foot lane. In case a sample fails to meet the requirements of the specifications, additional samples shall be obtained to locate the limits of the non-conforming material. Such non-conforming material shall be corrected by the Contractor, at no additional costs to the State, prior to final acceptance.
310.03 Construction Requirements .
310.03.1 General . The first section of each course to be constructed will serve as a test
section. The length of the test section will be determined by the capability of the equipment selected to perform the work, but will be at least 1000 linear feet but not more than 1500 linear feet for the designated width. The Engineer and the Contractor will evaluate results of the test section in relation to contract requirements. In case the Engineer determines the work is not satisfact ory, the Contractor shall revise procedures and augment or replace equipment as necessa ry to assure work is completed in accordance with the contr act, and shall correct all deficient work at no additional cost to the State. For the purpose of determining reasonable co nformity with the designated width of a course, the width of a course shall not vary from the designated edge lines by more than plus or minus three inches. Courses designated to be more than eight inches thick shall be constructed in two or more layers of approximately equal thickness. The maximum compacted thickness of any one layer shall not ex ceed eight inches. When the plans indicate multiple courses, each course shall be mixed or spread, shaped, and compacted separately. Multiple courses shall be constructed so that each course is in direct contact with the precedi ng course, and a cushion of un -stabilized material between layers will not be permitted. When material for shoulders is of a different class or type from that specified for the course being constructed, the partial formation of shoulders shall precede the placement of aggregate or plant mixed material. Temporary drainage as necessary through partially constructed shoulders shall be provided and maintained until construction of the contiguous course. No material shall be placed on or mixed with frozen material.
310.03.2 Equipment . Watering equipment shall have pressurized spray bars with
suitable nozzle openings. Mixing shall be performed with multiple pass mixers, single pass mixers, traveling mixing plants, or central mixing plants. Unless otherwise specified, the type mixer used will be at the option of the Contractor. Mixing equipment shall meet the applicable requirements of Subsection 308.03.2. Rollers shall be of sufficient number, type , size, and weight to accomplish the required compaction. When measurement for payment is to be made by the ton, the Contractor shall furnish approved platform scales capable of weighing the entire loaded vehicle. Scales and their use shall be in accordance with the requirements set out in Subs ection 401.03.2.1.11, except they shall be installed at an ap proved location on or near the project.
310.03.3 Preparation of Grade . Prior to placing material, the foundation shall be
prepared in accordance with th e requirements of Section 321 for a sufficient distance in advance to ensure proper prosecution of the work.
310.03.4 Preparation of Materials . The material to be stabilized shall be reasonably
free from clay balls, roots, grass, organic matter, and other deleterious substances.
310.03.5 Application of Stabiliz er Aggregate (Road Mix Method) . When the
roadbed has been prepared and approved, aggregate in the quantity specified shall be uniformly spread. The Contractor shall provide sufficient equipment and shall organize the work so that the time interval between dumping and spreading of aggregate and subsequent incorporation shall be the minimum necessary to carry on an efficient and con tinuous operation. Dumping of long lines of aggregate on the roadbed and prolonged periods of hauling adjacent thereto will not be permitted. Unless prevented by unavoidable conditions, aggregate shall be incorporat ed, mixed, shaped, compacted, and finished not later than the second day following delivery to the roadbed.
310.03.6 Mixing.
310.03.6 1--General . During the mixing operations, clay balls and other undesirable
materials present in sufficient quantity to impair the quality of the course shall be removed.
310.03.6 2--Road Mix Method . After the stabilizer aggregate has been uniformly
spread, the material shall be scarified, if necessary, and the mixing operation begun immediately. All preliminary scarifying and mixing shall be carefully controlled to provide an undisturbed foundation course with the designated grade and cross section. The Contractor shall be responsible for damage to or contamination with the underlying material or shoulder material, and shall make corrections and repairs as necessary at no additional cost to the State. All material to be stabilized shall be thoroughly mixed and pulverized by incorporating the added materials so that the course will be homogeneous throughout. During the mixing operation, water shall be applied as necessary to provide the needed moisture content for obtaining the required density. Particular care shall be exercised to ensure satisfactory moisture distribution along the edges of the course, and to avoid the application of excess water on any portion of a section.
310.03.6 3--Central Plant Method . Water shall be added during the mixing operation in
the quantity necessary to provide the needed moisture conten t. Mixing shall continue until a homogeneous mixture is obtained. After the mixing is complete, the mixture shall be transported while at the proper moisture content for compaction, and shall be placed on the prepared grade by means of an aggregate spreader. The Contractor shall deliver to the roadbed a sufficient quantity of mixed material to produce the designated course. All material placed in excess of the tolerances allowable in Section 321 shall be removed and hauled from the project without compensation, or removed and placed at other approved locati ons requiring use of the same material.
310.03.7 Spreading, Compacting, and Finishing . The mixed material shall be spread
immediately after mixing, or after delivery in the case of central plant mixed material. Spreading shall be carried out in a manner that will minimize segregation and will result in a completed course within the tolerances allowable. Compaction shall start longitudinally at the outer edges of the course and proceed toward the center. The material shall be sprinkled or aerated as necessary during compaction to maintain the needed moisture content. Shaping and compaction shall be carried out in such a manner as to prevent lamination and shall continue until the entire depth and width of the course has obtained the required density. Throughout the entire compaction op eration, the shape of the course shall be maintained by blading and rolling. Surface compaction and finishin g shall be performed so as to produce a smooth, closely knit surface, free from lamination, cracks, ridges, or loose material, and conforming to the required section and the established lines and grades within the tolerances allowable. Prior to subsequent construction, all irregu larities, depressions, soft spots, and other deficiencies shall be corrected to meet th e requirements of these specifications at no additional cost to the State. After compaction and finishing, if the mixture contains plus No. 4 aggregate and the course is to serve as a base for bituminous pa vement, at least one complete coverage shall be made with a steel wheel roller. The Engineer may waive this requirement for shell stabilized bases. In addition to the requirements for density and correction of irregularitie s, depressions, or soft spots, the Contractor shall be fully responsible for constructing and maintaining a course that will remain firm and stable under all construction equipment and other traffic that the course is subjected pr ior to the acceptance of the work. Density tests will be performed in accordance with the methods as provided in Subsections 700.03 and 700.04. Determination of acceptance of compaction of mechanically stab ilized courses for required density will be performed on a lot to lo t basis. Each lot will be each 2,500 linear feet per layer placed. At the discretion of the Engineer, a residual portion of a lot completed during a day's operation may be considered a separate lot or may be included in the previous or the subsequent lot, except that any day's operation of less than one full lot will be considered a lot. The lot will be divided into five approximately equal sublots with one density test taken at random in each sublot. The individual test s and the average of the five tests shall equal or exceed the values as shown in the table below. For any course that is to be subsequently chemically treat ed, the average of the five density tests shall equal or exceed 93.0 percent with no single density test below 89.0 percent. Composite Mixture Type Lot Average Individual Test A 102.0 98.0 B 100.0 96.0 C 99.0 95.0 D 97.0 93.0 The finished surface of all courses shall conform to the required section and the established lines and grades, within the tolerances allowable under Section 321. All finished courses shall be continually maintained until covered by a subsequent course or the work released from maintenance.
310.04 Method of Measurement . Mixing, shaping, and compaction will be measured
by the square yard, station, or mile, as designated, for each course included in the contract. Stabilizer aggregate will be measured by the cubic yard (LVM) or by the ton, as designated in the bid schedule of the contract. Other materials (except water) specified and incorporated into accepted work will be measured and paid for under the provisions of the governing pay items shown in the contract. When the method of measurement is by the ton, measurement will be made on the dry unit weight basis at the point of weighing. The moisture determination for computing the dry unit weight will be made in accordance with the methods set out in Subsection 700.03 at least one time each day, and as many additional times as the Engineer deems necessary. Water will not be measured for payment. Unauthorized wastage or usage of materials, unused materials remaining in stockpiles, and additional materials required for correction of unacceptable work will be deducted from measured quantities. Determination of quantities to be deducted will be made by the method the Engineer considers to be most practicable and equitable, and the Engineer’s decision as to the method used for such computations shall be final.
310.05 Basis of Payment. Mixing, shaping, and compaction will be paid for at the contract unit price per specified unit. Stabilizer aggregates will be paid for at the contract
unit price per specified unit. The prices thus paid shall be full compensation for completing the work. Payment will be made under: 310-A: Mixing, Shaping, and Compaction, Type____, Group____ - per square yard, station, or mile 310-B: Size____ Stabilizer Aggregate, Coarse - per cubic yard or ton 310-C: Stabilizer Aggr egate, Shell - per cubic yard or ton 310-D: Stabilizer Aggregate, Me dium - per cubic yard or ton 310-E: Stabilizer Aggregate, Fi ne - per cubic yard or ton SECTION 311 - LIME-FLY ASH TREATED COURSES
311.01 Description . This work consists of constructing one or more courses of a
mixture of soil, soil aggregate or aggregate, fly ash, lime, and water in accordance with these specifications and in reasonably close conformity with the lines, grades, thickness and typical cross sections shown on the plans or established by the Engineer. Unless otherwise provided, the Contractor may use either the travel plant or central plant method.
311.02 Materials . Soil, soil aggregate or aggregate, when Contractor furnished, shall
conform to the requirements set forth on the plans or in the contract. Other materials shall conform to the requirements of Division 700 as specified in the following subsections: Cut-back Asphalt 702.06 Emulsified Asphalt 702.07 Aggregate 703.20 Water 714.01 Lime 714.03 Fly Ash 714.05
311.02.1 Soil-Lime-Fly Ash Design . Quantities and percentages of lime and fly ash
shown on the plans are preliminary. The act ual application rate will be established from tests made prior to beginning treatment. The design of soil-lime-fly ash courses shall be performed by the Central Laboratory. At least 45 days prior to the proposed use of a lime-fly ash course, the Contractor shall make available materials conforming to the specifications and proposed for use in the mixture for sampling and testing by the Department as the Engineer may consider necessary for the establishment of a mix design. The approved proportions of material will govern during the progress of the work, and changes in source or character of any materi al shall not be made without approval. Approval will be based on verification of a mix design.
311.02.2 Curing Seals. Curing seal shall be Emulsifi ed Asphalt, Grade EA-1, EPR-1,
AE-P, CSS-1, SS-1, CMS-2h, or MS-2h meeting the applicable requirements of Section 702.
311.03 Construction Requirements .
311.03.1 General . Fly ash shall be spread at the sp ecified rate and lightly disked or
mixed into the soil or soil aggregate prior to spreading the lime.