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2102.1 General.
The following terms are defined in Chapter 2:
   AAC MASONRY.
   ARCHITECTURAL TERRA COTTA.
   AREA.
      Gross cross-sectional.
      Net cross-sectional.
   AUTOCLAVED AERATED CONCRETE (AAC).
   BED JOINT.
   BRICK.
      Calcium silicate (sand lime brick).
      Clay or shale.
      Concrete.
   CAST STONE.
   CELL.
   CHIMNEY.
      Factory-built chimney.
      Masonry chimney.
      Metal chimney.
   CHIMNEY TYPES.
      High-heat appliance type.
      Low-heat appliance type.
      Medium-heat appliance type.
   COLLAR JOINT.
   DECORATIVE SHROUD.
   DIMENSIONS.
      Nominal.
      Specified.
   FIREPLACE.
   FIREPLACE THROAT.
   FLUE.
   FLUE, APPLIANCE.
   FLUE GASES.
   FLUE LINER (LINING).
   FOUNDATION PIER.
   GROUT.
   HEAD JOINT.
   MASONRY.
      Glass unit masonry.
      Plain masonry.
      Reinforced masonry.
      Solid masonry.
      Unreinforced (plain) masonry.
   MASONRY UNIT.
      Hollow.
      Solid.
   MORTAR.
   MORTAR, SURFACE-BONDING.
   PRESTRESSED MASONRY.
   RUNNING BOND.
   SPECIFIED COMPRESSIVE STRENGTH OF MASONRY, f 'm.
   STONE MASONRY.
   STRENGTH.
      Design strength.
      Nominal strength.
      Required strength.
   TIE, WALL.
   TILE, STRUCTURAL CLAY.
   WALL.
      Cavity wall.
      Dry-stacked, surface-bonded walls.
      Parapet wall.
   WYTHE.
NOTATIONS.
   db   =   Diameter of reinforcement, inches (mm).
   Fs   =   Allowable tensile or compressive stress in reinforcement, psi (MPa).
   fr   =   Modulus of rupture, psi (MPa).
   f 'AAC   =   Specified compressive strength of AAC masonry, the minimum compressive strength for a class of AAC masonry as specified in ASTM C 1386, psi (MPa).
   f 'm   =   Specified compressive strength of masonry at age of 28 days, psi (MPa).
   f 'mi   =   Specified compressive strength of masonry at the time of prestress transfer, psi (MPa).
   K   =   The lesser of the masonry cover, clear spacing between adjacent reinforcement, or five times d b , inches (mm).
   Ls   =   Distance between supports, inches (mm).
   ld   =   Required development length or lap length of reinforcement, inches (mm).
   P   =   The applied load at failure, pounds (N).
   St   =   Thickness of the test specimen measured parallel to the direction of load, inches (mm).
   Sw   =   Width of the test specimen measured parallel to the loading cylinder, inches (mm).
Section BC 2103: Masonry Construction Materials
2103.1 Masonry units.
Concrete masonry units, clay or shale masonry units, stone masonry units, glass unit masonry and AAC masonry units shall comply with Article 2.3 of TMS 602. Architectural cast stone shall conform to ASTM C1364 and TMS 504. Adhered manufactured stone masonry veneer units shall conform to ASTM C 1670.
   Exception: Structural clay tile for nonstructural use in fireproofing of structural members and in wall furring shall not be required to meet the compressive strength specifications. The fire-resistance rating shall be determined in accordance with ASTM E 119 or UL 263 and shall comply with the requirements of Table 602 of this code.
2103.1.1 Second-hand units.
Second-hand masonry units shall not be reused unless they conform to the requirements of new units. The units shall be of whole, sound materials and free from cracks and other defects that will interfere with proper laying or use. Old mortar shall be cleaned from the unit before reuse.
   Exception: Second-hand masonry units need not conform to the requirements for new units when their reuse is to comply with historic restoration standards or requirements of the New York City Landmarks Preservation Commission or the New York State Historic Preservation Office.
2103.2 Mortar.
Mortar for masonry construction shall comply with Section 2103.2.1, 2103.2.2, 2103.2.3 or 2103.2.4.
2103.2.1 Masonry mortar.
Mortar for use in masonry construction shall conform to Articles 2.1 and 2.6A of TMS 602.

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