Powerpoint 1 Flashcards
what forms can masonry come in?
Bricks and blocks
What is dependant on whether brick or block?
size and dimensions!
what are clay bricks
shaping plastic clay into brick forms
then firing between 900-1200 in a kiln
is fired clay porous?
YES.
What properties does a porous material define?
- Porosity
- Density
- Compressive strength
- Moisture expansion
- Frost resistance
- Fire resistance
How are volumes of pores determined?
mass of water they contain
If a brick is frogged, what does this mean it will contain?
Mortar.
As there is a big variation in strength , how is compressive strength tested?
Done over more than six bricks
Moisture content influences what?
Test strength due to liquid water within pores producing hydrostatic pressures- rupturing pore walls
does brickwork undergo creep?
yah
Does brick ceramics undergo creep?
nein
what is efflorescence?
discolouration of brickwork due to its salts brought to the surface by water
where can efflorescence come from
mortar
external
the brick itself
what is efflorescence dependant on?
- quantity of soluble salts
- composition
- pore structure
what happens when bricks are exposed to air
they eX PAND
What happens to bricks when they are exposed to temperature where water freezes
the water expands
and the brick cracks
are bricks made strong from firing?
yes. the bricks are strong, and rigid. meaning they are stable in fire conditions
what are the main properties of clay bricks?
- good in fire/ chemical situ’s.
