CATEGORY 400 STRUCTURES SECTION 463 — BRICK MASONRY
463.01 Description
Construct brick masonry as specified.
463.02 Materials
Curing Compound 902.07.03 Brick Section 903 Mortar 903.06 Fusion Bonded Epoxy Powdered Coatings 917.02 Water 921.01 Dove Tail Anchors As specified Sample Panel. When specified, prepare and deliver a sample panel measuring at least 24 in. x 24 in. to the construction site for approval prior to beginning work. Provide a panel that is typical of the brickwork to be used on the project. Receive the Administration’s approval of the panel before beginning the brickwork on the project. Keep the sample panel on the project site. Construct all subsequent brickwork to equal the appearance of this approved panel.
463.03 Construction
Unless otherwise specified, lay all brick masonry in level courses with faces plumb, square, and true to the dimensions specified. Ensure that all exposed surfaces are smooth. Lay brick masonry for parapets and end posts parallel to the roadway or barrier. Construct brick facing as specified. 463.03.01 Bond. Unless otherwise specified, lay brick masonry in running bond. Lay adjoining courses to break joints by half brick as nearly as practical. 463.03.02 Bricklaying. Spray all brick with water to dampen the surface prior to laying. Only use fresh plastic mortar that is soft and workable when placed on the wall. Spread a layer of mortar on the beds and make not more than a shallow furrow in it that can be readily closed by the laying of the brick. Solidly fill all bed and head joints with mortar. Fully butter end joints of stretchers and side or cross joints of headers with mortar and make a shoved joint so that mortar is squeezed out at the top of the joint. Ensure that no brick is jarred or moved after it has been fully bedded in 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS the mortar. Remove and clean bricks loosened after the mortar has taken its set. Relay bricks with fresh mortar. Do not use broken or chipped bricks in the face. Do not use spalls or bats except where necessary to shape around irregular openings or edges. Place full bricks at ends or corners where possible. Use the bats in the interior of the course. In making closures, do not use bricks shorter than the width of a whole brick. Use only whole brick as headers.
463.03.03 Joints. Slush all joints with mortar at every course, slushing alone will not be
considered adequate for making an acceptable joint. Lay exterior faces in advance of backing. Back plaster or parge exterior faces with a coat of mortar at least 3/8 in. thick before the backing is laid up. Prior to parging, cut flush all joints on the back of face courses. Joints shall be 1/4 in. to 1/2 in. wide. Uniformly maintain whatever width is adopted throughout the work.
463.03.04 Pointing. Tool all exterior head and bed joints with a round tool, slightly larger than
the joint, pressed tight against the plastic mortar for a concave finish. When nails or line pins are used, plug the holes with mortar and point them immediately upon removal.
463.03.05 Cleaning. Upon completion of the work, clean all exterior surfaces by scrubbing and
washing down with water. If necessary, clean with a 5 percent solution of muriatic acid, then rinse off with liberal quantities of clean fresh water.
463.03.06 Curing. After the work has been laid up and pointed, cure the exposed surfaces using
one of the following methods:
a.Cover with two layers of burlap and keep wet for three days. (b) Apply a non-asphalt colorless liquid curing compound using an approved hand or motor driven spray operated at a pressure of 40 psi to 60 psi. Apply uniformly at a rate of 27 yd 2/gal. Ensure that the surface is completely coated and sealed in one application. Where there is evidence of insufficient coating, apply additional material as directed.
463.03.07 Cold Weather Protection. Do not perform brick masonry work and pointing when
there is frost in the brick or when the air temperature is below 50 F, unless suitable housing and heating devices are provided as necessary to keep the atmosphere surrounding the masonry at a temperature of at least 50 F for the curing period.
463.03.08 Backfill. Do not backfill before seven days after completion of the section.
463.04 Measurement and Payment
The payment will be full compensation for all sample panels, dove tail anchors, curing, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.
463.04.01 Brick Masonry for Structures will be measured and paid for at the Contract unit price
per square foot. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
463.04.02 Brick Masonry for Structures will be measured and paid for at the Contract unit price
per cubic yard.
463.04.03 Brick Masonry for Structures will not be measured but will be paid for at the Contract
lump sum price.
463.04.04 Brick Masonry Facing will be measured and paid for at the Contract unit price per
square foot.
463.04.05 Brick Masonry Facing will not be measured but will be paid for at the Contract lump
sum price. 464 — EPOXY PROTECTIVE COATINGS FOR CONCRETE CATEGORY 400 STRUCTURES SECTION 464 — EPOXY PROTECTIVE COATINGS FOR CONCRETE
464.01 Description
Furnish and apply epoxy protective coatings to concrete surfaces.
464.02 Materials
Sand 901.01 Epoxy Protective Coatings 917.01
464.03 Construction
Coatings shall not be applied until 30 days after removal of the forms. Abrade all surfaces to be coated by abrasive blasting, water blasting, or other mechanical means to provide a surface profile for improved adhesion. Ensure that the surface is sound, clean, thoroughly dry, and free of oil, grease, curing compound, and other foreign matter before applying the first epoxy protective coating. Apply two coats to the specified areas of the structure. Each application shall follow a dry weather period of at least two consecutive days and be within the time frame recommended by the manufacturer. Mask adjacent areas not to be coated or otherwise protect to prevent staining.
464.03.01 Mixing and Application. Mix and apply according to the manufacturer’s
recommendations. Apply by brush or roller. Do not apply to piers and abutments until the structural steel masonry plates are in place.
464.03.02 Coating Requirements. Sprinkle an excess of sand on the second epoxy coating on
the top surfaces of the piers and abutment bridge seat areas between beams pads while it is still wet. When it has hardened sufficiently to resist marring, remove sand not adhering to the coatings. Coat the following areas:
a.For abutments under a transverse joint, apply the coatings to the entire horizontal surface of the bridge seat areas (between and around the beam pads) and all exposed surfaces of the beam pads, and the entire contiguous vertical faces of the backwalls and cheek walls. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 583–585 of 1,113.