5-150
524.06 Basis of Payment Temporary structural supports will be paid for at the contract
unit price each, which price shall be full compensation for all materials, equipment, labor and incidentals necessary for the design, erection, maintenance , and dismantling of such supports in accordance with these specifications. Payment will be made under: P a y I t e m P a y U n i t
524.30 Temporary Structural Support Each
SECTION 525 - GRANITE MASONRY
525.01 Description This work shall consist of furnishing and p lacing granite pier facing
in accordance with these specifications and as shown on the Pla ns.
525.02 Materials The granite shall be obtained from a quarry a pproved by the
Department and be free from materials which, by weathering, wou ld cause discoloration or deterioration. The granite for the entire Project shall be uni form in color and free from seams, cracks and other structural defects. Caulking of joints shall be accomplished with a two-component, epoxy-resin system designed for the intended use. A quartzite aggregate shall be added in accordance with the manufacturer's recommendations. The material shall be moisture insensitive, of low modulus of elasticity, and of a gel-like non-sag viscosity. Co lor shall be gray. The materials shall be subject to the approval of the Resident. Anchors shall be of either ASTM A36 steel, galvanized in accord ance with AASHTO M111 (ASTM A123), or ASTM A276 Type 304 stainless steel, ¾ inch diameter, as indicated on the Plans. Other types of anchors may be used wit h prior approval of the Resident. Joint mortar shall comply with Section 705.02, Joint Mortar, ex cept that it shall contain an additive to insure water-tightness. The additive shall not contain a retarding agent or hydrated lime and shall be approved by the Resident.
525.03 General Granite masonry shall have all stones dressed a nd cut to exact
dimensions and laid up in joint mor tar, with joints 1-½ inch +/ - ⅛ inch in thickness. A complete setting plan shall be submitted to the Department fo r approval, before ordering any stone. The arrangement and the length of the stones shall be approved by the Department. 5-151
525.04 Stones The finish on exposed surfaces of the stones sha ll be free from tool
marks. Irregular projections shall be limited to a maximum of 3 inches for any one stone measured from the pitch line. Irregular depressions shall be l imited to a maximum of 1 inch for any one stone measured from the pitch line. Stones shall have their edges pitched to a true line with tops and bottom parallel and cut to lie on their natural beds. The top and bottom beds shall be the full size of the stone, and hollow beds shall not be permitted. The beds of stone shall be sawn or fine finished, full depth. The vertical face joints shall be sawn or fine finished for a depth of not less than 4 inches, with the balance not to fall away more than 4 inches. The top layer of granite shall have a 1-½ inch wide chisel draf t line along the top face adjacent to concrete. All stones shall be so finished that no holes or portions of ho les shall show on surfaces that will be exposed in the finished work. The depth of the stone shall be not less than 8 inches and not more than 12 inches, measured from the back face of the stone to the pitch line. Th e Contractor shall use extreme care when placing the concrete within the boundaries of the sto ne facing to avoid causing air pockets due to overhanging stones. Stone heights shall be a mi nimum of 15 inches.
525.05 Anchors Holes for anchors shall be drilled in the stone s before they are placed.
There shall be a minimum of 2 anchors at a maximum spacing of 4 8 inches in the top and bottom beds of each piece and grooves shall be cut from the anchor holes to the back of the stones. Stones greater than 48 inches in height shall have additional a nchors located in the back face of the pieces such that there will be a maximum spacing, b oth vertical and horizontal, of 48 inches between anchors. Anchors in the top and bottom beds of each stone shall be locat ed such that an anchor will be not greater than 18 inches from each end of the piece. Anchors in the back face of each stone shall be located such that an anchor will be not gre ater than 18 inches from each end of the piece.
525.06 Mortar Joint mortar shall be machine mixed for not less than 1-½ minutes after
all ingredients are in the mixer. Mortar shall be used within 30 minutes after mixing and the retempering of mortar will not be permitted. The mixing and pl acing of mortar shall be discontinued when the atmospheric temperature is below 40 degre es Fahrenheit in the shade, and dropping, and shall not be resumed until the atmospheric te mperature is as high as 35 degrees Fahrenheit in the shade, and rising, unless otherwise a uthorized by the Resident.
525.07 Setting Stones Stones shall be thoroughly cleaned befor e being set and the bed
to receive the stones shall be well cleaned. The thickness of all joints and beds shall be 5-152 uniform throughout. Spalls shall not be used as pinners in mor tar beds or joints. When any stone is disturbed or mortar joint broken, the stone shall be t aken up, and after all mortar has been cleaned from the stone, bed and joints, the stone shall be reset in fresh mortar. All stones shall be well bedded with the face joints properly raked before the mortar has set. The masonry shall be kept w et during the pointing, and in hot o r dry weather shall be protected from the sun and kept wet for a period of 3 days afte r completion of setting, unless otherwise permitted or directed. Face surfaces of stone shall not be smeared with mortar and after pointing has been compl eted and set, the masonry shal l be thoroughly cleaned to the satisfaction of the Resident. Stones shall not be set when the stones contain frost or during freezing weather, unless otherwise permitted. Concrete backing shall be of the class shown on the Plans. The concrete shall be so worked and compacted that all spaces around stones are complete ly filled and an adequate bond with the stone is secured. Construction joints in the con crete, required by intermittent placing, shall be located not less than 6 inches below the top bed of any course of the stone facing. The stones shall be secured and the concrete so placed , as approved by the Resident, to prevent movement of the stones during placement of the concr ete.
525.08 Joints All joints shall be raked 1-½ inches deep and ca ulked with an approved
two-component epoxy-resin system. All caulking shall be done i n such a manner as to produce a tight, durable and impervious seal at all joints. Al l caulking shall be accomplished as soon as possible to avoid exposure at joints to salt water. The two-component epoxy-resin system shall be proportioned, mix ed, and applied in accordance with the manufacturer's recommendations. The joint below the bottom layer of granite shall be 1 inch ±½ inch in thickness.
525.09 Method of Measurement Granite masonry will be measured for payment by the
number of square feet of exposed granite masonry, including joi nts, in the completed work and measured from the pitch lines as shown on the plans.
525.10 Basis of Payment Granite masonry will be paid for at th e contract unit price per
square foot complete in place and accepted. This price shall i nclude all materials, equipment, labor and incidentals necessary to complete the work . The cost of the anchors, completed and in place, shall be included in the Contract unit price of this item. Payment will be made under: P a y I t e m P a y U n i t
525.30 Granite Masonry Square Foot
SECTION 526 - CONCRETE BARRIER 5-153
526.01 Description This work shall consist of the furnishing, constructing, erecting,
setting, resetting, and removal of concrete barrier and associa ted elements in accordance with these specifications, the Standard Details and the lines a nd grades shown on the Plans or established by the Resident. The types of concrete barrier are designated as follows: Temporary Concrete Barrier Type I Double faced removable concr ete barrier of the shape shown on the Plans. Permanent Concrete Barrier Type II Double face barrier of a sh ape shown on the Plans. Permanent Concrete Barrier Type IIIa Single face barrier 32 in ches high of a shape shown on the Plans. Permanent Concrete Barrier Type IIIb Single face barrier 42 in ches high of a shape shown on the Plans. Permanent Concrete Transition Barrier Barrier of various heigh ts joining steel bridge rail to steel guardrail. Permanent Texas Classic Rail Barrier, either traffic rail or s idewalk rail, as shown on the Plans.
526.02 Materials a. Concrete Concrete shall meet the provisions of Section 502, Structural Concrete, and
Portland cement shall conform to the requirements of AASHTO M85 , Type I, II, or III. Concrete for permanent barriers shall be Class LP, in accordanc e with Section 502.05, Composition and Proportioning. Concrete for temporary barriers shall be Portland cement concre te with a minimum compressive strength of 2,500 psi. The Department reserves the right to take test core samples from the barriers in accordance with ASTM C42. Average compressive test strengths below 2,500 psi will result in rejection of the barri ers.
b.Reinforcing Steel Reinforcing s teel shall meet the requirem ents of Section 503, Reinforcing Steel.
c.Structural Steel Plate steel shall meet the requirements s pecified in Section 713.01, Structural Steel. Hot dipped galvanizing of plate steel shall be in accordance with AASHTO M111 (ASTM A123).
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 442–445 of 817.