20 Questions
What are the three stages in a painting system?
Primer, Undercoat, Finishing coat
What is the main function of the primer in a painting system?
To grip the substrate, provide protection against corrosion/dampness, and provide a good key for remaining coats
What is the purpose of the undercoat in a painting system?
To provide good opacity (hiding power) and a smooth surface, and to contain large quantities of pigment for hiding power
What is the primary function of the finishing coat in a painting system?
To provide a durable layer of the required color and texture
What are the main components of paint?
Vehicle or binder, Pigment, Extender
What is the primary constituent responsible for the gloss and mechanical properties of the final coating?
Vehicle
What are the advantages of using emulsion paints for interior decorating?
Brushes can be washed out in water, suitable for new cement or plaster
What is the purpose of adding plasticizers to cellulose paint?
To give elasticity
Why are solvents often flammable in paints?
They need to be volatile
Why do primer and undercoats have large proportions of pigments?
To produce opacity
What are the properties of bricks?
The properties of bricks include strength, durability, fire resistance, and thermal insulation.
Explain the manufacturing process of clay bricks.
Clay bricks are made by pressing clay into a mold, extracting it into a formed unit, and then heating it to sinter the clay.
What are the harmful ingredients to bricks and their chemical compositions?
The harmful ingredients to bricks include lime, iron, and alkalies. Their chemical compositions can negatively impact the quality and durability of the bricks.
Describe the different types of bricks and their uses.
There are various types of bricks, including common bricks, facing bricks, and specially shaped clay bricks. They are used for different purposes in construction, such as load-bearing, decorative, and specialized applications.
What is the definition of a brick?
A brick is a building unit that is easily handled with one hand and has a standard metric size of 215 x 102.5 x 65 mm.
What is the purpose of lime and oxides in clay bricks?
Helping grains of sand to melt and bind clay particles together + impart red color
How does excessive lime affect the color of clay bricks?
It would give out a dark blue color
What are the harmful effects of pebbles of stones and gravel in clay bricks?
Weak, porous brick; cracks; inability to be readily cut or worked
How does alkaline-salts affect the appearance of clay bricks in damp conditions?
They absorb moisture from the atmosphere, resulting in a greyish white deposit (efflorescence) that spoils the building appearance
What is the purpose of tempering in the clay preparations for manufacturing clay bricks?
To increase the plasticity of clay
This quiz covers the different types and functions of paints, including their protective, decorative, and special effects properties. It also discusses the three stages of a painting system: primer, undercoat, and finishing coat.
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