Types of Gypsum Plaster and Their Uses

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What are plaster blocks, also known as, according to the text?

Fiberglass insulation panels

Structural clay tiles

Concrete blocks

Gypsum partition blocks (correct)

What are the typical thicknesses of gypsum hollow blocks mentioned in the text?

100mm, 125mm, and 150mm

75mm, 100mm, and 150mm (correct)

50mm, 75mm, and 100mm

125mm, 150mm, and 200mm

What is the typical length of gypsum hollow blocks mentioned in the text?

800mm

500mm

600mm

700mm (correct)

What is the typical thickness of gypsum solid blocks mentioned in the text?

50mm (D) Signup and view all the answers

What is the purpose of structural clay tiles according to the text?

Load-bearing walls (C) Signup and view all the answers

What is the typical size of load-bearing structural clay tiles mentioned in the text?

300mm x 300mm x 300mm (C) Signup and view all the answers

What are the typical sizes of non-load bearing structural clay tiles mentioned in the text?

125mm x 200mm x 300mm (A) Signup and view all the answers

What is the typical interior web or partition thickness of structural clay tiles mentioned in the text?

25mm (B) Signup and view all the answers

How are the various shapes of structural clay tiles formed according to the text?

Extruded through a die (D) Signup and view all the answers

What is the surface finish of structural clay tiles mentioned in the text?

Both smooth and scored (D) Signup and view all the answers

What is the main difference between coursed ashlar and broken range ashlar?

Coursed ashlar has stones uniform in size, while broken range ashlar has stones of varied sizes. (D) Signup and view all the answers

What distinguishes rustic or rock work from random course work?

Rustic work presents a rough surface with jagged stone faces, while random course work continues horizontal beds. (D) Signup and view all the answers

What characterizes brick manufacturing according to the text?

Brick manufacturing involves screening, grinding, and burning at high temperatures after molding. (B) Signup and view all the answers

What is the purpose of rustication in stone masonry?

To emphasize heavier stones or areas that project from the wall face. (B) Signup and view all the answers

How do irregular stones combine in ashlar random course masonry?

They combine in a convenient manner without continuing horizontal beds. (C) Signup and view all the answers

What distinguishes ashlar masonry from rubble work?

Ashlar involves regular courses with squared stones, while rubble work uses irregular stones. (A) Signup and view all the answers

What is the purpose of adding water to mortar?

All of the above (D) Signup and view all the answers

Why should mortar never be retempered after it has begun to set?

It will lose its strength (B) Signup and view all the answers

What is the main difference between mortar and plaster?

Mortar is used for masonry, while plaster is applied in coats to surfaces (A) Signup and view all the answers

What is added to plaster to give it increased strength?

Fiber or hair (D) Signup and view all the answers

How many coats are typically applied in a three-coat plastering job?

3 (D) Signup and view all the answers

What is the purpose of the scratch coat in a three-coat plastering job?

To act as a binding coat (D) Signup and view all the answers

What is the definition of a 'bed' in masonry construction?

The horizontal surfaces on which stones or bricks lie in courses (D) Signup and view all the answers

Which of the following best describes a 'course' in masonry?

A continuous horizontal layer of masonry units (A) Signup and view all the answers

What is the meaning of 'wythe' or 'tier' in masonry construction?

Each continuous vertical section of the wall, one unit thick (C) Signup and view all the answers

Which of these best describes the term 'bond' in masonry?

The connection formed by lapping masonry units to prevent vertical joints from aligning (D) Signup and view all the answers

What is a 'stretcher' in masonry construction?

A brick or block laid with its length parallel to the wall face (B) Signup and view all the answers

Which term refers to masonry units laid on their ends, perpendicular to the wall face?

Soldier (C) Signup and view all the answers

What is the typical thickness range of gypsum hollow blocks mentioned in the text?

75mm (3") or 125mm (5") (A) Signup and view all the answers

What are structural clay tiles classified into according to the text?

Load-bearing and non-load bearing (C) Signup and view all the answers

What material is typically used as binders in plaster blocks?

Gypsum (A) Signup and view all the answers

What are the typical dimensions of a load-bearing structural clay tile mentioned in the text?

300mm x 300mm x 300mm (C) Signup and view all the answers

What is the purpose of gypsum hollow blocks as per the text?

Used for fire-resistant interior partitions (A) Signup and view all the answers

How are gypsum solid blocks different from gypsum hollow blocks as per the text?

Solid blocks have thicker dimensions (A) Signup and view all the answers

What is the ratio of lime putty to gypsum plaster in the hard finish mix?

1 part lime putty to 1 part gypsum plaster (B) Signup and view all the answers

What is the ratio of lime putty to gypsum plaster in the sand float mix?

1 part lime putty to 1/4 part gypsum plaster (D) Signup and view all the answers

What is the ratio of high-strength gypsum plaster to sand in the hard finish mix?

1 part high-strength gypsum plaster to 2 parts sand (D) Signup and view all the answers

What is the ratio of lime putty to high-strength gypsum plaster in the hard finish mix?

1/4 part lime putty to 1 part high-strength gypsum plaster (C) Signup and view all the answers

What is the key difference between gypsum plaster and high-strength gypsum plaster?

High-strength gypsum plaster meets established standards for strength. (D) Signup and view all the answers

What is the key difference between fibered gypsum plaster and prepared gypsum plaster?

Fibered gypsum plaster is premixed with fibers, while prepared gypsum plaster is mixed with fine white sand. (D) Signup and view all the answers

What is the primary purpose of acoustics plaster according to the text?

For acoustic treatment of interior walls and ceilings (C) Signup and view all the answers

How is acoustics plaster typically applied?

Applied on gypsum plaster base coats (B) Signup and view all the answers

For a three-coat plastering job using Portland cement plaster, what is the ratio of cement to lime putty in the scratch and brown coats?

1 cement, $\frac{1}{4}$ lime putty (D) Signup and view all the answers

What is the minimum thickness for the scratch and brown coats in a three-coat plastering job?

$\frac{1}{4}$ inch (C) Signup and view all the answers

What technique is "sgraffito" referring to?

A method of applying multiple colored plaster coats and cutting away areas to create a design (B) Signup and view all the answers

What are Plaster Blocks, also known as, used for according to the text?

Interior partition walls (B) Signup and view all the answers

What distinguishes Gypsum Hollow Blocks from Gypsum Solid Blocks as per the text?

Thickness availability (C) Signup and view all the answers

How are Structural Clay Tiles classified according to the text?

Purpose of use (C) Signup and view all the answers

What distinguishes Structural Clay Tiles from Plaster Blocks in terms of manufacturing?

Presence of interior webs (B) Signup and view all the answers

What is the typical thickness range of Gypsum Hollow Blocks mentioned in the text?

$75$mm (3") to $150$mm (6") (B) Signup and view all the answers

What is the primary purpose of Structural Clay Tiles mentioned in the text?

Furring and fireproofing (D) Signup and view all the answers

In what dimensions are Load-bearing Structural Clay Tiles typically available according to the text?

$100$mm x $200$mm x $300$mm (B) Signup and view all the answers