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Properties which affect behaviour of Facing Brick (Coatings (Coating of…
Properties which affect behaviour of Facing Brick
Colour
Selection of raw material of blend
Produce buff & other light colours
Iron oxide & other iron compounds are major natural colourants
Colours is changeable by changing maturing temperature
Colour deepen as temperature and time increases.
Kiln atmosphere
Change brick red colours into black, brown & golden colours.
"Flashing" process
Create non-red colours by introducing reducing atmosphere
Colour assortment by controlling exposure time and firing time
Texture
Shaping Methods
Molding
Distinctive and prized texture
Water-struck brick texture
Pressing
Low water content
More regular shape and sharper outline
Die-slickened exterior surface
Extrusion
Die-slickened surface
Predominant process
Scratched, brushed or roughened
Coatings
Coating of mineral mixtures
Granular and uneven
continuous coating
Completely masks the base material colour
Engobes
Mature to semivitreous but non-glassy state
Glaze
Mature to glass-like substance
Efflorescence
A type of surface discoloration during storage
Discoloration
Deposit of soluble substances on surface
Durability
Method
50 cycles of freezing and thawing when saturated with water
Types of Failure
Spalling
Splitting away of a thin layer of the face of brick
Cooling cracks
Craze cracks
Crumbling and disintegration
Causes of Failure
Expansive force of water converting to ice
Salt crystallization
Poor design practice
Dimensional movement
Mismatch in movement
Prediction of Failure Probability
Percentage water absorption
Saturation coefficient
Moisture Expansion
0.02-0.09%
Non-reversible moisture expansion under drying treatment
Reversible thermal expansion
Chipping
Become noticeable when bricks coated with engobes
Allowable number of chips is specified in ASTM C216