Fly ash brick – their size, weight and compressive strength | size of fly ash brick | weight of fly ash brick | compressive strength of fly ash brick.
Fly ash brick is a building material, specially manufacture for external and internal wall, it containing Class C or class F fly ash and water. Their main ingredient is coal dust, fly ash, water, quick lime, lime sludge, cement aluminium powder and Gypsum.
During the manufacturing process it is compressed at 28 MPa and cured for 24 hours in a 66 degree Celsius steam bath, then toughened with their air entrainment agent. And their manufacturing process reduce pollution in environment, reduce cost up to 20% less than traditional clay brick and due to uniform shape and size plaster cost will be reduced up to 50%.
Raw material of fly ash Brick in consist of fly is 60% by mass, sand/ stone dust is about 30% by mass and Portland cement or lime is about 10% by mass.
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High concentration of calcium oxide CaO in Class C fly ash brick describe “self cementing”. Their pozzolanic reactivity of fly ash is more due to calcium oxide, the greater the pozzolanic activity leads to higher the strength of fly ash brick.
Autoclaving increases the hardness of fly ash brick by promoting quicklime curing of the cement and Gypsum composition act as long-term strength gainer.
As per ASTM fly ash brick is classified into two types Class C contain more than 10% lime and class F fly ash contains less than 10% lime.
Fly ash brick – their size, weight and compressive strength
Construction of external and internal wall installed with fly ash brick reduces the dead load on a structure due to light weight (2.6kgs, 230 × 110 × 70 in mm or 9″ × 4″ ×3″ in inch). Due to high strength, practically no breakage during transport and use.
What is the size of fly ash brick
Size of fly ash brick:- rectangular solid fly ash brick, medium and light weight used in construction, their minimum, regular, normal size is 230 × 110 × 75 in mm or 9″ × 4″ × 3″ in inch and 230 × 110 × 100 in mm or 9″ × 4″ × 4″ in inch. This is ideal, best, perfect, nominal and standard size of fly ash brick for house construction. And it can be available in other suitable sizes depending on quality and consumer demand.
Size of fly ash brick measured in mm or inch, commonly used in India, US, UK, Philippines Australia, Canada, Ireland, New Zealand and other part of world are following:-
1) 400 × 200 × 200 in mm or 16″ × 8″ × 8″ in inch ( Length × width × height).
2) 400 × 150 × 200 in mm or 16″ × 6″ × 8″ in inch ( Length × width × height).
3) 400 × 100 × 200 in mm or 16″ × 4″ × 8″ in inch ( Length × width × height).
4) 300 × 150 × 150 in mm or 12″ × 6″ × 6″ in inch ( Length × width × height).
5) 300 × 230 × 150 in mm or 12″ × 9″ × 6″ in inch ( Length × width × height).
6) 230 × 110 × 75 in mm or 9″ × 4″ × 3″ in inch ( Length × width × height).
7) 230 × 110 × 100 in mm or 9″ × 4″ × 4″ in inch ( Length × width × height).
What is the weight of fly ash brick
Construction of external and internal wall will preferred light weight fly ash brick to reduces the dead load on a structure, generally, for light weight fly ash brick size of 230 × 110 × 70 in mm or 9″ × 4″ ×3″ in inch, their weight could be 2.6kgs. Due to high strength, practically no breakage during transport and use.
Density or Unit Weight of fly ash brick is vary between 1500kg/m3 to 1850kg/m3 or 94lbs/ft3 to 115lbs/ft3, it means 1 cubic metre of volume of fly ash brick weight is vary between 1500kg to 1850 kg or 1 cubic foot volume of fly ash brick their weight is vary between 94 pounds to 115 pounds.
Generally, normal, medium, weight of fly ash brick, used for construction, is vary between 2.75kgs to 3.25kgs or 6 ponds to 8.25 pounds for regular size 9″ × 4″ × 3″ and 9″ × 4″ × 4″ respectively.
Weight of other size of fly ash brick calculated as multiply its volume and density, we kept density of medium weight fly ash brick is about 1700kg/m3, for size 400mm × 200mm × 200mm fly ash brick, their weight could be 27kg/brick, for size 400mm × 150mm × 200mm fly ash brick, their weight could be 20kg/brick, for size 400mm × 100mm × 200mm fly ash brick, their weight could be 14kg/brick, for size 300mm × 150mm × 150mm fly ash brick, their weight could be 11kg/brick, for size 300mm × 230mm × 150mm fly ash brick, their weight could be 17kg/brick, for size 230mm × 110mm × 75mm fly ash brick, their weight could be 3.2kg/brick and for size 230mm × 110mm × 100mm fly ash brick, their weight could be 4.3kg/brick.
What is the compressive strength of fly ash brick
Compressive strength of fly ash brick testing on compressive testing machine commonly known as CTM machine, their strength is measured in some different unit like MPa, N/mm2 or kg/cm2, generally on average according to ASTM and IS code, compressive strength of fly ash brick should be range from 7.5 to 10 in N/mm2 or 7.5 to 10 in MPa or 75 to 100 in kg/cm2. This is minimum, normal, on average and standard compressive strength of fly ash brick used in construction.
How to increase compressive strength of fly ash brick
We can increase compressive strength of fly ash brick by applying higher concentration of calcium oxide and their pozzolanic reactivity and autoclaving process with gypsum and and quicklime.
High concentration of calcium oxide CaO in Class C fly ash brick describe “self cementing”. Their pozzolanic reactivity of fly ash is more due to calcium oxide, the greater the pozzolanic activity leads to higher the strength of fly ash brick.
Autoclaving increases the hardness of fly ash brick by promoting quicklime curing of the cement and Gypsum composition act as long-term strength gainer.
