712.02Calcium Chloride Calcium chloride shall conform to the requirements of
AASHTO M 144.
712.04Stone Curbing and Edging S tone for curbing and edging shall be approved
granite from acceptable sources. The stone shall be hard and d urable, predominantly gray in color, free from seams that impair its structural integrity and of smooth splitting character. Such natural variations may include bands or clusters of minera l or both of mineral crystallization that do not impair the structural integrity of the curb stone. The dimensions shape and other details shall be as shown on the plans. The exposed face of stone curbs hall be free from indications of drill holes. Half drill holes not larger than ¾ inch diameter will be permitted i n the arris line in the plane of the back.
with no depression or projection on that surface of over ⅛ inch . The top front arris line shall be pitched straight and true with no variations from a st raight line greater than ¼ inch. The top back arris line shall meet the same requirement except that indentations of a maximum of ⅜ inch will be allowed. There shall be no projection or depression on the back face that would exceed a batter of 1 horizontal on 3 verti cal for a distance from the top of 3 inches. The front face shall be at right angles to the top and shall b e smooth split and have no projections greater than 1 inc h or depressions greater than ½ i nch, measured from the vertical plane of the face through the top arris line for a dis tance down from the top of 8 inches. The remainder of the face shall have no projections or depressions greater than 1 inch from the plane of the face. The ends of the curb shall be approximately square with the pl anes of the top, back and face and so finished that when the sections are placed end to e nd with the required minimum spacing of ¼ inch no more than ⅝ inch space shall show in the joint for the full width of the top surface and f or the entire exposed front face. The remainder of the end may extend back no more than 8 i nches from the plane of the joint. Drill holes through the curb w ill be allowed providing they ar e at least 9 inches below the top and are mortared full with Portland cement mortar befor e placing the stone.
the plans or ordered by the Resident, for driveways, crossings, closures, transitions or for other reasons, the Contractor shall furnish curbing with the re quired modifications.
Vertical Curb, Type 1 and to the shape, dimensions, and details as shown on the Standard Detail
Natural grain size and color variations characteristic of the s ource deposit will be permitted.
shall be cut in lengths of not less than 4 feet nor greater tha n 10 feet. Random lengths of curb less than 4 feet in length m ay be obtained if the Resident determines it necessary to meet field conditions. All curb to be set on a radius of 60 fe et or less shall be cut . Vertical Bridge Curb shall confor m to the requirements above, e xcept as indicated on the plans and as follows:
than 1 inch, measured from the vertical plane of the back face through the arris or pitch line down to the bottom of the stone. The front face sha ll be finished as required for Vertical Curb, Type 1, except that it shall be fin ished the full distance down on the face. Bottoms of curb stones shall be approximatel y parallel to the top and sawed or dressed to lay w ith a bedding of approximately 1 i nch for the full length of the stone.
on the plan, a maximum of 18 inches from each end of the stone and spaced horizontally at a maximum of 4 feet apart. A minimum of 2 anch or holes shall be provided in each stone.
shall be cut to present a vertical face when set in position, b eveled to the skew angle, if any and the entire end finished in the same manner as the top.
with the planes of the top and fr ont face so that a neat, paral lel joint, free from drill holes is formed between the stones. Length of stones shall be so scheduled that joints will be uniform in width along any run of curb. Jointss hall be ½ inch ±⅛ inch. A joint shall be provided at each curb and sidewalk cont raction joint of the bridge.
shall have the top beveled to fit the grade of the bridge.
with sufficient water to form a workable mix. Cement, sand, an d water shall conform to Section 502 - Structural Concrete.
with sufficient water to form a workable mix and shall conform to Section 502 - Structural Concrete.
consistency shall be such that it will flow readily.
no projections or depressions which will allow over 1 inch to s how between a 2 foot straightedge and the face when t he straightedge is placed as cl osely as possible on any part of the face. Half drill holes not m ore than 3 inches in length and ¾ inch in diameter will be permitted along the bottom. The arris line, top front shall be straight and true with no variation from a straight line greater than ⅛ inch. The arris lines at the bottom of the face shall be straight and true so that not over 1 inch shall show b etween the stone and a straightedge for the full length of the stone. The ends shall be square to the length at the face and so finished that when the stones are placed end to end , no space more than 1½ inches will show in the joint for the width of the face. When Type 5 Curbing is required on a curve, the pieces shall be shaped as described in the table on the Standard Detail plans.
712.05Preformed Plastic Type of Material This section covers reflectorized plastic ma terials preformed into
rolls or ribbons of various lengths, pliability, and widths sui table for use as reflecting pavement markings on Portland cement concrete or hot mix asphal t pavement. The pavement marking material used shall be from the Department’s Q PL and have been tested through NTPEP. General Characteristics The preformed marking materials shall consist of white or yellow films with pigments selected and blended to provide the appropriate highway colors for traffic markings. Glass or ceramic beads shall be incorporated to provide immediate and continuing retroreflection. The size, quality, and refractive index of the beads shall be such that the performance requirements of this specification shall b e met. The edges of the preformed material shall be clean cut and tru e. The preformed plastic material may be supplied complete with a precoated, fac tory applied adhesive for immediate pavement applicati on without the use of heat, solvent , or other types of adhesive for immediate pavement appli cation without the use of heat, sol vent, or other types of adhesive operations or it may be furnished with separate adhesi ves as recommended by the manufacturer. The affixed material shall be capable of molding itself to the pavement contoured by the action of traffic and maintain its original dimensions and placement under normal traffic conditions at the pavement temperatures, which could occur with in the State. After application, the markings shall be immediately ready for traffi c. Physical Requirements - Color Pigments shall be selected and blended to conform to standard highway colors throughout the expected life of the mat erial. When tested by Federal Test Method Standard 141 Method 4232, the white shall b e no darker than Color
Number 37778 of Federal Standard Number 595 and the yellow shal l conform to Color Number 33538 of Federal Standard Number 595 (Highway Yellow Col or PR#1). Retro-Reflectivity The retro-reflective preformed film shall have a layer of reflective spheres bonded to the top surface. The white and ye llow film shall have the following initial minimum retroreflectance values at 0.2° and 0 .5° observation angles and 86° entrance angle as measured in accordance with the photometr ic testing procedures of ASTM D 4061. Retroreflectance values shall be expressed as specific luminance in millicandelas per square meter per lux (mcdm -²lx-¹) [millicandelas per square foot/foot candle (mcd ft-²fc-¹)]
White Yellow
Observation Angle 0.2° 0.5° 0.2° 0.5° SL[mcdm-²lx-¹ ] 550 380 410 250 [mcd ft-²fc-¹]
The test distance shall be 50 feet and the sample size a 2 by 2½ foot rectangle. The angular aperture of both the photoreceptor and light projector shall be 10 minutes of arc. The reference center of the sample and the reference axis shall be taken perpendicular to the test sample. Bead Retention When tested with a 2 by 6 inch sample bent ov er a ½ inch diameter mandrel with the 2 inc h dimension perpendicular to the mandrel axis, microscopic examination of the arc on the mandrel shall show no more than 1 0 percent of the beads are entrapped in the binder and less than 40 percent of the surface of the bead. Application The preformed plastic material shall be capable o f application to non- defective pavement surfaces that are dry and free from dirt or other foreign matter. For normal application, the pavement temperature should be at least 60°F and rising. Special instructions should be supplied by the vendor for appl ication to be made at pavement temperatures below 60°F. Application shall be accordin g to manufacturer's recommended procedures. Plastic pavement marking materials sha ll only be applied to surfaces with temperatures within the range specified by the ma nufacturer for optimum adhesion. Adhesive, activators or special coatings for various types of pavement surfaces shall be provided with the preformed plas tic material. Detailed info rmation must be supplied with the material outlining required application procedures for such adhesives, activators, or special coating. Preformed plastics shall be capable of being applied to new as phalt pavement immediately prior to the final rolling of the new surface and o f being rolled into place with conventional pavement and highway rollers. The plastic materia l and adhesives used in
such applications shall be of the type that water used on the r oller to prevent asphalt pickup shall not be harmful to the successful application of the plast ic. Special equipment necessary for the successful installation of any preformed plastic material shall be available from the manufacturer of the plasti c material on a lease, loan, or purchase basis. Longitudinal lines shall be offset at least 2 inches from cons truction joints of Portland cement concrete pavement. When directed by the Reside nt, opening of 6 inch lengths shall be left at 20 foot intervals in edge lines not in laid into the pavement surface that are placed on the inside of superelevated curves so as to prevent the ponding of water on the pavement surface.
712.06Precast Concrete Units Precast concrete units shall con form to the plan
dimensions and shall meet the requirements of AASHTO M 199 exc ept as modified below. Approved structural fibers may be used as a replacement of 6 x 6 #10 gauge welded wire fabric when used at an approved dosage rate for the constr uction of manhole and catch basin units. The material used shall be one of the products lis ted on the Maine Department of Transportation’s Qualified Products List of Macro Synthetic Fibers for Concrete Reinforcement. . Cement shall conform to Section 701. An approved air-entraini ng admixture shall be added to obtain the required air content. Aggregates shall meet the quality requirements of Section 703. 01 - Fine Aggregate for Concrete and Section 703.02 - Coarse Aggregate for Concrete except that limitations on grading and the fineness modulus may be omitted. The concrete mix design shall be approved by the Department. C oncrete shall contain 6.0 percent air content, plus or minus 1.5 percent tole rance when tested according to AASHTO T 152. All concrete shall develop a minimum compressive strength of 4000 psi in 28 days when tested according to AASHTO T 22. The absorption of a specimen, when tested according to AASHTO T 280, Test Method “A”, shall not ex ceed 9.0 percent of the dry mass.
1 Structural Precast Concrete Units Structural precast concrete units shall
conform to the dimensions show n on the Plans, the requirements of this Specification and with the reviewed Working Drawings. Materials Materials for concrete shall conform to the requirem ents of Standard Specification Section 502.03, Materials. Cement shall be Type I, Type II, or Type III. Coarse aggregate for concrete shall conform to Class A, A A or Latex. The maximum water cement ratio shall be 0.40. For the purpose of calculati ng water cement ratios, one U.S. gallon of water shall be considered to weigh 8.34 pounds. Concrete shall contain a
minimum of 3 gallons per cubic yard of calcium nitrite solution . The minimum 28 day compressive strength shall be 5,000 psi, unless otherwise state d in the Contract. Material for reinforcing shall meet the requirements of Standar d Specification Section
709.01Reinforcing Steel or Section 709.02 - Welded Steel Wir e Fabric
Only one mat of steel is required for concrete member thicknesses of seven inches or less; two mats of steel, one at each face, are required for con crete member thicknesses greater than seven inches. Grout materials, rapid setting concrete patching materials, and geotextiles shall be one of the products listed on the Department's Qualified Products List (QPL). Quality Control and Quality Assura nce Quality Control (QC) is the responsibility of the Contractor. The Quality Control Inspector (QCI) shall inspect all aspects of the work. The Contractor shall generate a nonconformance report (NCR) for materials and/or workmanship that is nonconforming. The NCR shall describe the nonconformance and the proposed corrective action. Copies of the NCR shall be provide d to the Department’s Quality Assurance Inspector (QAI) and the Fabrication Engineer for review. Nonconforming material and/or workmanship shall be corrected or replaced. In the event that an item fabricated under this Specification d oes not meet the Contract requirements but is deemed suitable for use by the Department, it may be accepted in accordance with Section 106.8, Non-Conforming Work, of the Stan dard Specifications. Acceptance is the prerogative of the Department. The Departmen t will conduct Quality Assurance (QA) in accordance with Standard Specification Subsection 106.5. Testing deemed necessary by the Department that is in addition to the m inimum testing requirements will be scheduled to minimize interference with th e production schedule. The QAI will perform acceptance sampling and testing and will witne ss or review documentation, workmanship and testing to assure the Work is be ing performed in accordance with the Contract Documents.
The QAI has the authority to reject materials and products that do not meet the Contract requirements, including Work rejected due to denial of access o r the lack of adequate notice of the beginning of production. The acceptance of material or workmanship by the QAI will not prevent subsequent rejection, if the Work is later found to be unacceptable. The Contractor shall provide a private office at the fabricatio n plant for the QAI in accordance with the Facilities for Inspection requirements in S tandard Specification Section 535. Construction The precast units shall be manufactured at a faci lity that has had a minimum of five years of experience in producing similar type p roducts. The plant shall meet the requirements of AASHTO M-157. Facilities that are cer tified by the Precast/Prestressed Concrete Institute (PCI) or the National Pr ecast Concrete Association
The Contractor shall notify the Department of the planned start of production date of the precast units a minimum of two weeks prior to beginning production for in-Maine work and a minimum of three weeks prior to beginning production for out- of-Maine work. If the production schedule changes, notify the Fabrication Engineer no less than three Working Days prior to the initial production start-up date. Any Work d one without the QAI present will be rejected. Advise the F abrication Engineer of the produ ction schedule and any