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Questions and Answers
Which type of mortar is typically used for reinforced masonry applications like foundations?
Which type of mortar is typically used for reinforced masonry applications like foundations?
What is the primary benefit of adding lime to cement mortar?
What is the primary benefit of adding lime to cement mortar?
Which type of mortar is characterized by a compressive strength of 750 psi?
Which type of mortar is characterized by a compressive strength of 750 psi?
What is the main component of masonry cement that distinguishes it from other mortar types?
What is the main component of masonry cement that distinguishes it from other mortar types?
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Which type of plaster is known for its good finish on the interior surfaces?
Which type of plaster is known for its good finish on the interior surfaces?
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What is a defining feature of Type O Mortar?
What is a defining feature of Type O Mortar?
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In the mortar mix proportions table, what ratio represents Class B mortar?
In the mortar mix proportions table, what ratio represents Class B mortar?
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What is the typical setting characteristic of lime mortar compared to cement mortar?
What is the typical setting characteristic of lime mortar compared to cement mortar?
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What is one characteristic of rubble stone?
What is one characteristic of rubble stone?
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Which type of stonework is characterized by fitting stones of different shapes together randomly?
Which type of stonework is characterized by fitting stones of different shapes together randomly?
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What differentiates dimension stone from rubble stone?
What differentiates dimension stone from rubble stone?
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Which of the following is a feature of Ashlar masonry?
Which of the following is a feature of Ashlar masonry?
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What is the primary purpose of the rustic or rock work stone face?
What is the primary purpose of the rustic or rock work stone face?
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Which of these types of stonework involves laying stones in courses that are not uninterrupted?
Which of these types of stonework involves laying stones in courses that are not uninterrupted?
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What is a common feature of Coursed Ashlar stonework?
What is a common feature of Coursed Ashlar stonework?
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Which type of rubble stone treatment only removes the most obvious irregularities?
Which type of rubble stone treatment only removes the most obvious irregularities?
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What key characteristic distinguishes sandstone from other types of building stones?
What key characteristic distinguishes sandstone from other types of building stones?
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Which type of stonework involves a combination of stones laid in regular courses but varying their size and placement?
Which type of stonework involves a combination of stones laid in regular courses but varying their size and placement?
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What is a primary characteristic of masonry walls?
What is a primary characteristic of masonry walls?
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Which type of masonry wall consists of two layers with an air space in between?
Which type of masonry wall consists of two layers with an air space in between?
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What is the purpose of bond stones in masonry walls?
What is the purpose of bond stones in masonry walls?
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Which of the following materials is primarily used to make Concrete Hollow Blocks (CHB)?
Which of the following materials is primarily used to make Concrete Hollow Blocks (CHB)?
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Which statement accurately describes reinforced masonry walls?
Which statement accurately describes reinforced masonry walls?
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What unique feature do weep holes provide in masonry walls?
What unique feature do weep holes provide in masonry walls?
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What is the primary function of flashing membranes in masonry walls?
What is the primary function of flashing membranes in masonry walls?
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What distinguishes a veneered wall from other masonry wall types?
What distinguishes a veneered wall from other masonry wall types?
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What is typically the preferred size of hollow blocks in the Philippines market?
What is typically the preferred size of hollow blocks in the Philippines market?
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What characteristic do unreinforced masonry walls lack that reinforced walls possess?
What characteristic do unreinforced masonry walls lack that reinforced walls possess?
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What is the primary characteristic of Lightweight Gypsum Plaster?
What is the primary characteristic of Lightweight Gypsum Plaster?
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Which type of plaster is primarily used for ornamental work and castings?
Which type of plaster is primarily used for ornamental work and castings?
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What is the minimum thickness of the finish coat in a three-coat plaster job?
What is the minimum thickness of the finish coat in a three-coat plaster job?
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Which plaster type is known for its increased adhesive strength?
Which plaster type is known for its increased adhesive strength?
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What is the role of the 'course' in masonry terms?
What is the role of the 'course' in masonry terms?
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Which term refers to a brick or block laid lengthwise in a wall?
Which term refers to a brick or block laid lengthwise in a wall?
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Which type of plaster is mixed with fine white sand for a smooth finish?
Which type of plaster is mixed with fine white sand for a smooth finish?
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In sgraffito, how are the different colored layers of plaster manipulated?
In sgraffito, how are the different colored layers of plaster manipulated?
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What distinguishes High-Strength Gypsum Plaster from standard Gypsum plaster?
What distinguishes High-Strength Gypsum Plaster from standard Gypsum plaster?
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What is a 'wythe' in masonry construction?
What is a 'wythe' in masonry construction?
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Which type of brick is specifically designed for exposed masonry applications?
Which type of brick is specifically designed for exposed masonry applications?
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What is the primary feature of Flemish Bond in brickwork?
What is the primary feature of Flemish Bond in brickwork?
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What is the typical size of a standard brick?
What is the typical size of a standard brick?
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Which type of brick is known for being fire-resistant and load-bearing?
Which type of brick is known for being fire-resistant and load-bearing?
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Which bond method features headers centered over stretchers?
Which bond method features headers centered over stretchers?
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What is a key characteristic of Glazed Bricks?
What is a key characteristic of Glazed Bricks?
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What distinguishes English Cross Bond from standard English Bond?
What distinguishes English Cross Bond from standard English Bond?
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Study Notes
Mortar
- Mortar is a mixture of siliceous materials (sand, crushed stone) and cement (lime, Portland) that hardens into a stone-like mass when mixed with water
- Mortar is used to bond masonry units together or to apply surfaces like tiles, bricks, and stones
- Cement Mortar: made with fine sand, requires more cement for strength, mixed by hand or mechanically
- Lime Mortar: mixture of lime, sand, and water, low setting and hardening rate, low compressive strength, rarely used
- Cement-Lime Mortar: Cement mortar with added lime for plasticity and water retention
- Masonry Cement: proprietary mixture of Portland Cement with hydrated lime, plasticizers, air-entraining agents, and gypsum, only needs sand and water
Mortar Strengths
- Type M Mortar: High strength for reinforced masonry used for foundations and retaining walls below ground
- Type S Mortar: Medium-high strength for applications where good bond and lateral strength are important
- Type N Mortar: Medium-strength for general use above grade, where high compression and lateral strength are not required
- Type O Mortar: Low-strength mortar, suitable for interior non-load-bearing walls
- Type K Mortar: Very low-strength mortar, suitable for interior non-load-bearing walls
Mortar Proportions
- Class AA: 1:1 Cement to Sand Ratio
- Class A: 1:2 Cement to Sand Ratio
- Class B: 1:3 Cement to Sand Ratio
- Class C: 1:4 Cement to Sand Ratio
- Class D: 1:5 Cement to Sand Ratio
Plaster
- Plaster is a mortar of cementitious materials (lime, gypsum, or cement), sand, and water applied in coats (layers) to provide a hard finish to interior or exterior walls and ceilings
- Lime Plaster: a mixture of lime putty (hydrated lime and water) mixed with sand and gypsum plaster for interior and exterior walls and ceilings
- Gypsum Plaster: Plaster of Paris with clay, lime, and other materials, covered by trademarks or patents
Plaster Types
- Exterior and Interior Walls/Ceilings: Mixed on the job with water, sand, and lime putty, sometimes including hair or fiber
- High-Strength Gypsum Plaster: Same as Gypsum plaster but mixed to meet established standards
- Fibered Gypsum Plaster: Gypsum plaster premixed with fibers
- Prepared Gypsum Plaster: Gypsum plaster mixed with fine white sand
- Bonding Plaster: Gypsum plaster mixed with more adhesive strength
- Lightweight Gypsum Plaster: Fire-resistant Gypsum plaster with perlite, vermiculite, or other mineral aggregate
- Keene's Cement: Plaster of Paris mixed with alum or borax, burned at 932°F
- Portland Cement Plaster: Mixed on the job with water, sand, and lime putty
- Plaster of Paris: Used for ornamental plaster work and castings
Plaster Thickness
- Metal lath: 5/8"
- Lathing board/gypsum block: ½"
- Three-coat plastering: scratch and brown coats are ¼" thick, finish coat is 1/8" with a minimum of 1/16" thickness
Sgraffito
- Highly decorative plaster technique developed in Italy during the Renaissance
- Two or three thin coats of plaster in different colors are applied and then cut away to create a 3D design
Unit Masonry
- Unit masonry is built up of building materials (clay, concrete, or stone) set in mortar or plain concrete
- Bed: Horizontal surfaces on which bricks or stones rest
- Course: A continuous layer of bricks, stones, or masonry units
- Wythe/Tier: A continuous vertical section of a wall, one masonry unit thick
- Bond: Connection between masonry units, preventing vertical joints from falling over each other (also called a breaking joint)
- Stretcher: A brick or block laid lengthwise of a wall
- Header: A brick or block extending over the thickness of the wall
- Heading course: All bricks/masonry units are headers
- Soldier: A unit laid on its end, with its face perpendicular to the wall
- Quoins: Corner stones at the angles of buildings, often rusticated
Masonry Walls
- Walls are made from modular building blocks or units bonded with mortar
- Solid Walls: Simple construction
- Cavity Walls: Two layers of masonry with an air space in between
- Veneered Walls: A wall structure with a thin layer of facing material over a core wall
Bonding Masonry Walls
- Bond Stones: Stones running through the wall thickness at right angles to bind it together
- Blocking Courses: A course of stones on top of the cornice or top to crown the wall
Concrete Hollow Block (CHB) Walls
- CHBs are made of concrete, portland cement, and aggregates (usually sand and fine gravel)
- Lower density blocks can use industrial wastes as an aggregate
- Lightweight blocks can use aerated concrete
- Dimension of CHB: 8" (200mm) high, 16" (400mm) width and depths vary from 4" to 8" with 2 or 3 holes
Concrete Block or Cement Block (CMU)
- A hollow or solid concrete masonry unit (CMU) made of Portland cement and suitable aggregates
Masonry Stress Types
- Unreinforced masonry walls: Plain masonry walls with horizontal joint reinforcement and metal wall ties
- Reinforced masonry walls: Walls utilize steel reinforcing bars embedded in grout-filled joints and cavities
Other Components
- WEEP HOLE: A hole at the bottom of the wall to allow water to drain
- GRADE: A level where the top of the wall is
- FLASHING MEMBRANES: Waterproof material used for protection from moisture
Stone Building Materials
- Stone is a fundamental building material commonly used for exterior and interior surfaces
- Granite
- Marble
- Travertine
- Limestone
- Sandstone
- Slate
Rubble Stone
- Rough and irregular shapes delivered from quarries
- Scrabbled Rubble: Only the most obvious irregularities are knocked off
- Range Rubble: Rough stones dressed and laid to a nearly uniform height.
Dimension Stone
- Cut into specific sizes, squared to dimensions and a specific thickness
Stonework Types
- Ashlar stones are squared and laid in regular courses
- Random Work uses stones of different shapes fitted together randomly
- Range Work or Coursed Ashlar:
- Coursed Ashlar: stones laid in uniform courses of uniform sizes
- Broken Range Ashlar: uniform size within courses, but course width and length of the stones is varied
- Random Coursed Ashlar: stones laid in courses but their horizontal beds are not uniform, varying size and placement between stones
Rustic or Rock Work
- The stone face is jagged or rough, achieved by leaving protruding or projecting stone or stone around the joint areas
Types of Bricks
- Common/Building Brick: Used for all purposes
- Facing Brick: Specially processed for a specific surface appearance, used for exposed masonry
- Glazed Brick: Smooth outer surface, with a dull or high-gloss finish
- Fire (Refractory) Brick: Used for furnace linings, fireplaces, and chimneys
Brickwork
- Common Bond: A course of headers is placed between every five or six courses of stretchers
- English Bond: Alternate courses of headers and stretchers
- English Cross Bond: A modified English bond, where the head joints in the stretching courses are offset
- Flemish Bond: Alternative headers and stretchers in each course
Standard Brick Size
- 3-3/4" x 2-1/4" x 8"
ATLAS-CDC Architecture Review
Brick Bonds
- Flemish Cross Bond: A modified Flemish bond where courses of alternate headers and stretchers alternate with stretching courses
- Flemish Diagonal Bond: A form of Flemish cross bond where courses are offset to create a diamond pattern
- Garden-Wall Bond: A brickwork bond suited for lightly loaded boundary walls
- Herring-bone: Bricks are laid diagonally to form a herringbone pattern
Brick Joints
- Joints between brick courses range from 4.5mm (3/16") to 12mm (1/2")
- Flush, keyed, strong, recessed, weathered, and raked out
Other Masonry Units
- "DURISOL" Block: Lightweight blocks made from fiber and cement
- Plaster Block: Also known as gypsum partition blocks, used for lightweight, fire-resistant interior partitions
- Structural Clay Tile: Hollow masonry units open at two ends with interior webs dividing into longitudinal cells
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Description
Module 1 - Materials of Construction - Building Technology (Atlas)