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Masonry - PowerPoint PPT Presentation


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Masonry. Terms F 15-1 -> 15-5 Go thru all figures Joints between brick = ¼ inch. Brick. F 15-6 Go thru sizes for brick Compressive strength range 2500psi – 22,000psi T 15-1 shows mortar strength Brisk wall only as strong as weakest part. Brick. Pattern bonds How bricks are laid

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slide2
Terms
    • F 15-1 -> 15-5
    • Go thru all figures
    • Joints between brick = ¼ inch
brick
Brick
  • F 15-6
    • Go thru sizes for brick
    • Compressive strength range 2500psi – 22,000psi
    • T 15-1 shows mortar strength
    • Brisk wall only as strong as weakest part
brick4
Brick
  • Pattern bonds
    • How bricks are laid
      • Running bond – only stretcher courses with head joints centered over stretchers
      • Common bond – header course repeated at regular intervals – usually 5th,6th or 7th course
      • Flemish – bond – alternates stretchers and headers in each course headers are centered over stretchers
      • English bond - alternate courses of headers and stretchers
      • Stack – no interlocking – architectural effect
    • F 15-7
hollow masonry walls
Hollow Masonry Walls
  • Masonry Cavity Walls
      • Two masonry wythes separated by a 2” minimum airspace and held together with metal ties
      • Advantages over single masonry wall: greater resistance to moisture penetration, better thermal and acoustical insulation, excellent fire resistance
    • Utility wall – made from utility brick, two walls with brick used to bond walls together
hollow masonry walls6
Hollow Masonry Walls
  • Reinforced Brick Masonry Walls
      • Hollow walls are filled with grout and rebar to provide strength
      • Can be precast
      • Provides a strong wall with exterior finish – uses less concrete
bond beams and lintels
Bond Beams and Lintels
  • Bond Beam
    • Continually reinforced horizontal beam of concrete or masonry designed to provide additional strength and prevent cracking
      • Frequently placed in foundations and at roof levels
    • Lintel – short beam of wood, steel, or reinforced brick masonry to span opening in masonry wall
    • Masonry arch
    • F15-11
control joints
Control Joints
  • Expansion Joints
      • Used to permit differential movement due to movement of floor slabs, foundation
      • Separate walls into sections with vertical expansion joints

Joints at doors and windows, columns, pilasters, wall offsets, cross walls, under shelf anglesin multistory buildings

    • Control Joint – cut into masonry wall to control shrinkage cracking
control joints9
Control Joints
  • Structural bonding
      • Flexible ties extending across joint or interlocking construction
      • F 15-12
    • Flashing – layers of impervious material
      • Used above vertical joints, roof and wall junctions, window sills, other projections, chimneys
      • F15-13
concrete masonry
Concrete Masonry
  • Concrete Block
  • Concrete Tile
  • Solid load bearing concrete block
    • Over 75% concrete
  • Hollow load bearing concrete block
  • Hollow non- load bearing concrete block
    • Hollow block = at least 25% of core area is empty
concrete masonry11
Concrete Masonry
  • Either heavy weight or light weight concrete blocks
    • Blocks can either be laid using mortar or laid dry
    • If dry use parging to join block together
    • F 15-14
reinforced concrete masonry
Reinforced Concrete Masonry
  • Provides additional strength and prevents cracking
  • F15-15, 15-16 -> 18
pattern bond
Pattern Bond
  • Running bond most common
  • F 15-20
estimating quantity
Estimating Quantity
  • Bricks
    • 1. Calculate net surface area of wall
    • 2. calculate surface area of 1 brick including mortar
    • 3. divide wall area by brick area
    • 4. multiply by number of wythes in wall
    • 5. add an amount for waste
estimating quantity15
Estimating Quantity
  • Mortar
    • Volume per brick =(t)(W)(L+H+t)
    • t = mortar thickness
    • W = brick width/depth inches
    • L = length of bricj inches
    • H = height of brick inches
    • Add 25% waste
    • For double wall must add in for mortar in space
wind load on fresh masonry
Wind load on Fresh Masonry
  • Need to brace fresh wall until mortar has cured
    • F 15-24
    • Safe unbraced height = (Wt of wall / unit of surface x wall thickness)/wind force
    • T 15-3
slide17
Mortar
    • Must be well mixed
    • Must have correct mix of fines and coarse material
    • Must not be used more than 2.5 hours after initial mixing
slide18
Placing Masonry and Reinforcing
    • CMU and brick absorb water
    • Should be stored dry
    • Should be wetted before use and allowed to surface dry
    • Joints must be tooled for watertight joints