Brick Manufacturing Process
Brick Manufacturing checking the quality
- It should have a rectangular shape regular surface red-colored appearance.
- It should confirm in size to the (320×110×55)mm as per Nepal standard.
- When two bricks are struck together they produce a metallic sound.
- A good building brick should not absorb water more than 20 % of its dry weight.
- The brick should hard enough so that it is not scratched by a fingernail.
- The density of good brick should have more than 35 KG/m³.
- A good brick has a uniform color and structure throughout its body.
- Brick should not break when falling from 2m height above ground.
Composition of good Brick Manufacturing
This topic discusses how to compose good brick for the building. What are constituents require to compose good brick? Friends this topic also important topics. Because we know about the composition of brick. What kind of material is used in the brick. What is the effect of which type of brick is better for the building?
- Oxide of iron
Oxide of iron
Molding of Bricks
- Hand molding
- Machine molding
- Stiff mud method
- Dry press method
Latest: Measuring Tape
Drying of brick
- After molding of the brick has to dry before burning. This is essential for at least three reasons.
- To make the brick strong enough to bear rough handling during stacking in the kilns for burning.
- To allows loss of moisture from the brick at a slow rate. If the green brick is straightway brought to the kiln for burning the loss of moisture will be fast enough to cause their disintegration.
- To save fuel during the burning stage.
Burning of Brick
The intermittent kiln
The continuous kiln
Test for brick.
Compressive Strength Test Brick Manufacturing
- Take five bricks randomly from a brick store for a brick sample and immersed them in water for 24 hr at room temperature.
- After 24 hr take them out allow them to drain and then clean surplus water.
- Now fill their void by larger of 1:1 mortar stone these brick under damp sacks for 24hr.
- Place the brick in water for seven days.
- Take the brick out of the water and drain surplus water.
- Place the brick flatwise between two plywood sheets.
- A brick so adjusted between the plywood sheet is placed on the bed of the testing machine and load apply axially and at a uniform rate of 140 kg/cm² per minute.
- Note down at which the brick fails.
- This load ‘p’ divided by cross-section area ‘A’ of brick gives the compressive strength of brick. C=P/A.
- The arithmetic mean of compressive strength of all five bricks shall take as the compressive strength of the store of brick.
Water Absorption Test Brick Manufacturing
- Take five bricks randomly from the store of brick.
- Dry those samples to constant weight by placing them in a ventilated oven at 5°-110°+5°. This takes 48 hr or more.
- The bricks are weight samples then immerse in water at room temperature for 24 hr.
- After 24 hr the sample takes out. Each sample is dry and weighs individually within three minutes after it takes out of water.
- Absorption value calculate by using simple relation
- Absorption =(w2-w1/w1)×100
- Where w1 is dry weight and w2 is the weight after being immersed in water for 24 hr.
- The average of five values for five samples shall take as the water absorption of that store of brick.
Classification of Brick Manufacturing
First Class Brick
- Well burnt having an even surface and perfectly rectangular shape.
- When two brick is strick each other a ringing sound produce.
- Its compressive strength shall not be less than 140 kg/cm².
- Water absorption does not exceed 20%.
- Excellent for all types of construct also suitable for flooring.
Second Class Brick
- Well burnt even slight over burnt accepted.
- Compressive strength shall not be less than 70 kg/cm².
- Water absorption between (20-22)%.
- For interior work when plastering is to do.
- For interior wall but Not for flooring.
Third Class Brick
- Poorly and unevenly burnt that it may over burnt or under burnt or under burnt.
- Compressive strength lies between (35-70)% kg/cm².
- Water absorption (22-25)%.
- Use mostly in ordinary and in a dry situations.
Fourth Class Brick
- Irregular in shape and dark in color. Which is due to overburning.
- Quite strong in compressive strength about 150 kg/cm² and low water absorption.
- Use in broken from in road construction.