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1. Government polytechnic ASTHAWAN, NALANDA Name - Rohit Kumar (2024 – CE – 107) Name - Harsh Kumar (2024 – CE – 082) Name - Rohit Kumar (2024 – CE – 037) Name - Shaurya Raj (2024 – CE – 302) Name - Rakesh Kumar (2024 – CE – 048)

2. Topic : strength of different types of bricks Branch : Civil Engineering Year : 2024 – 2027 Semester : Third Semester Subject : Building Construction & Material Subject code : 2415304 ( Term Work)

3. Introduction : Bricks : Bricks are a fundamental building material . Understanding the strength of different types of bricks is crucial for construction project . 2. What is strength : The strength of bricks is measured by its compressive strength , or it’s ability to withstand a crushing force .

4. Class designation Average compressive strength not less than (N/mm²) 25 25 N/mm² 20 20 N/mm² 17.5 17.5 N/mm² 15 15 N / mm² 12.5 12.5 N/mm² 10 10 N/mm² 7.5 7.5 N/mm² 5 5 N/ mm² 3.5 3.5 N/mm²

5. Types of Bricks First class bricks : Second class bricks : Third class bricks : Fourth class bricks :

6. First class bricks These are table mould and burnt in kiln . Smooth surface and rectangular in shape which parallel to shape strength edges With square corner . Water absorption shall not exceed 20% of immersed in water for 24 hours . Crushing strength >= 10.5 N/mm² . These bricks are recommended for pointing work exposed face work for masonry structure , flooring and rain force bricks work .

7. 2 . Second class bricks These are grounded mould and burnt in klin . Small cracks and distortion are permitted . Water absorption shall not exceed 22% of immersed in water for 24 hours . Crushing strength >= 7N/ mm² . These bricks are recommended for hidden masonry work and centering of reinforced bricks and reinforced cement concrete structure .

8. 3 . Third class bricks These are grounded mould and burnt in clamps . Soft and raddish yellow in colour . Water absorption shall not exceed 25% of immersion in water for 24 hours . Crushing strength >= 5N/mm² . These bricks are recommended for unimportant and temporary works where rainfall is not heavy .

9. 4 . Fourth class bricks These are overburnt bricks which are badly distored . Used as ballast in foundation and floors in lime concrete . Compressive strength more than 40 N/ mm² . The water absorption of this bricks is limited to 5% .

10. Thank you