463 BRICK MASONRY
From MDOT Policy Manual
- Construct brick masonry as specified.
Curing Compound 902.07.03 Brick 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 x 24 in. to the construction site for approval prior to beginning work. The panel shall be typical of the brickwork to be used on the project. Receive the AdministrationShall mean any one of the Administrations within the Maryland Department of Transportation, as listed in GP 1.02.’s approval of the panel before beginning the brickwork on the project. Keep the sample panel on the project site. All subsequent brickwork shall be equal in appearance to this approved panel.
- 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 the mortar. Bricks loosened after the mortar has taken its set shall be removed, cleaned, and relaid 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, but 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 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, which shall be rinsed 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 nonasphalt colorless liquid curing compound using an approved hand or motor driven spray operated at a pressure of 40 to 60 psi. Apply uniformly at a rate of 27 yd2/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 StructuresBridges, culverts, catch basins, drop inlets, retaining walls, cribbing, manholes, end walls, buildings, sewers, service pipes, underdrains, foundation drains, steps, fences, and other features that may be encountered in the work and not otherwise classified. will be measured and paid for at the Contract unit price per square foot.
- 463.04.02 Brick Masonry for StructuresBridges, culverts, catch basins, drop inlets, retaining walls, cribbing, manholes, end walls, buildings, sewers, service pipes, underdrains, foundation drains, steps, fences, and other features that may be encountered in the work and not otherwise classified. will be measured and paid for at the Contract unit price per cubic yard.
- 463.04.03 Brick Masonry for StructuresBridges, culverts, catch basins, drop inlets, retaining walls, cribbing, manholes, end walls, buildings, sewers, service pipes, underdrains, foundation drains, steps, fences, and other features that may be encountered in the work and not otherwise classified. 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 be measured and paid for at the Contract lump sum price.