Check Brick Quality Find good bricks in market. Bricks is one of the main blocks to construct a building. Failure in choosing bricks, it causes to serious damages in building construction. Better to choose good quality bricks wisely, Build your beautiful dream home with strong walls made of high quality bricks.
How To Check Brick Quality, Types, Tests Calculate Quantity
check quality of bricks with various type of factors. quality of brickwork directly depends upon the materials we used. Bricks impart strength and durability. Inferior quality bricks can affect the aesthetics of your home due to poor alignment. Brick is most extensively used materials of the building construction. How to choose right quality bricks.
The Standard size of brick is 190mm x 90mm x 90mm
Types of Tests for find good quality bricks
Uniform Size, Shape and Color test
Compressive strength test
Water Absorption test
Brick by Size, Color and Shape.
By looking, you can grade it. Good quality bricks should be well burnt and have good red to black colors. it almost copper color for all well made bricks. by size, it has all same uniform sizes. Brick should be uniform in size it shouldn’t have any bulks on edges. by Size, good quality of bricks should have an accurate dimension whereas +/- 3 tolerance is allowed. Noteout a good quality brick should have bright and uniform color throughout. Bricks are closely viewed to check if its edges are sharp and straight and uniform in shape. The shape of bricks should be purely rectangular with sharp edges. Standard brick size consists length x breadth x height as 19cm x 9cm x 9cm. Test method for confirm, To perform this test, select 20 bricks randomly from brick group and stack them along its length , breadth and height and compare. Good quality brick Should be free from cracks. The good quality of bricks is must for the long life of the structure and it also reduces the maintenance.
Compressive strength test
Two opposite sides forcing, apply force to brick two sides like crushing. Strength of bricks is determined by placing brick in the compression testing machine. the note breaking point, apply load slowly on it until brick breaks. Minimum crushing strength of brick is 3.50N/mm2. in case, brick failed to carry minimum load. if it is less than 3.50 N/mm2, it failed for construction purposes.
Compression testing machine or Universal testing machine is required for the compressive strength testing of bricks.
Good quality of bricks is always great hardness capacity. Good brick should not show any impression or scratch of a fingernail on the brick. Bricks should be no impression left when you try to make a scratch with your fingernails. simple test is brick should not break when you drop it from 1.2 meter – 1.5-meter height on the hard ground surface.
Brick quality checking by water absorption method. in this process bricks are weighed in dry conditions and let them immersed in freshwater for 24 hours. Note first weight of brick as W1. after 24hours of immersion, those are taken out of the water and wipe out with a cloth or paper sponge. Wet condition brick weighed noted as W2. The difference between W1-W2 is water absorbed by brick. For a good quality brick the amount of water absorption should not exceed 20% of weight of dry brick. If the brick absorbs more than the allowable limit. It absorbs water from cement mortar during its bonding. This eventually affects the brick bonding strength.
[ W1 – W2 ] / W1 = Water Absorption Percentage > 20% of W1
good quality brick should not contain any soluble salts in it. Presence of soluble salt in the bricks is dangerous. They produce a grey or white powder layer on the brick surface by absorbing moisture. White patches on bricks resemble presence of sodium and potassium salts on it which is not suitable for construction. To know the presence of soluble salts in a brick, placed it in a waterbath for 24 hours and dry it in shade. After drying, observe the brick surface thoroughly. If there is any white or grey color deposits in failure bricks. Bricks should be free from harmful salts (Sodium and Potassium). If we use these type of bricks in construction, the salt present in the bricks got dissolved while mixing with water and cause structural damage.
Simple method to test brick quality, Take two bricks one in each hand and stuck it, When two clay bricks are stuck together, a metallic ringing sound should come. If brick breaks without sound then it isn’t suitable for construction. If the bricks give clear metallic ringing sound and don’t break then those are good quality bricks.
By looking bricks should be healthy, homogeneous, compact and free from any defects such as holes, lumps. Broken bricks with low strength not use for building. If there are any flaws, cracks or holes present on that broken face then that isn’t a good quality brick.
Type of Bricks
First Class Brick: The brick which has a compressive strength of 10N/mm2 is called as a First class brick
Second Class Brick: The brick with compressive strength of 7N/mm2 is called as a Second class brick
Building brick: The brick which we use for building has a compressive strength of 3.5N/mm2
Sundried Brick: The sun dried brick has a compressive strength of 1.5N/mm2 to 2.5N/mm2
Brickwork Calculations, Estimate
Calculate the Volume of Single brick
Standard Size of Brick is 190mm x 90mmx 90mm.
Universal Brick Size 9″x 4″x 3″
Converting inch to m for ease in calculation.
Total Volume = 9″x4″x3″ = 0.2286m x 0.1016m x 0.0762m
Volume of Brick in Cu.m = 0.00176980 cu.m
Question : No. Of Bricks required for 1 Cubic Metre or 1m3
Volume required = 1m x 1m x 1m
Total Volume Required = 1Cu.m or 1m3
Volume of Each brick = 0.0017698m3
No. of Bricks in 1m3 = 1/0.0017698 = 565 Bricks
Answer: 565 Bricks required for 1Cubic metre
Question: How to Calculate No. of Bricks required in a wall 12*12
The standard thickness of Cement Masonry layer in Brickwork is 0.39″ or 10mm
Adding mortar thickness to brick
Add 0.39″ to all sides of brick (9″+0.39″, 4″+0.39″,3″+0.39″)
The size of brick with mortar thickness is 9.39″ x 4.39″ x 3.39″ in Inch
Inch converts into Fts.
9.39″ x 4.39″ x 3.39″ = 0.78ft x 0.36ft x 0.28ft
Area of brickwork = L x D
Area of Total wall (L x D) = 12′ x 12′ = 144Sft [Area]
Area of Each Brick (L x D) =0.78′ x 0.28′ = 0.218Sft (With Mortar thickness)
Depth or thickness of the bed 4 inch
The length and Depth of Bed is 12′ x 0.33′ = 3.6sqf
2 Beds in brickwork: 7sft
Deduct the area of RCC Bed from the above wall area for Brickwork calculation
Therefore, 144Sft – 7Sft = 137Sft
Font face area = 0.218 ft
Total No. of Bricks = 137/0.218 = 628 Bricks required (approx)
Brick Soaking Process
When good quality brick is soaked in water, the brick absorbs water and release air so that when it is used in masonry and placed over the wet mortar, it will no more absorb any water from the wet mortar. Water cement ratio is also important for the strength and bondage of mortar. Thus because of loss of water from mortar, hydration of cement will not take place and mortar will not gain strength. hus, it will fail to make a strong bond between bricks and mortar. Normally it is suggested to soak bricks for atleast 12 hours. Soaking of bricks should be continued till air bubbling ends.