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Why cracks appears in concrete slab | Why concrete cracks
https://www.btechmentor.in/2021/05/why-concrete-cracks-in-slab.html

🇮🇳important point of Bricks🇮🇳

1) Nominal Size of Brick (20x 10 x 10) cm)

2) Standard size of Modular size of Brick (19x9x9) cm

3)Dimensions of Frog = (100x40)mm And 10-20mm deep

4)Traditional size of brick (230×114×76 )mm

5)Water absorption of 1st class brick should not be greater than 20% of its dry weight

6)Crushing strength / Compressive strength of Brick Or First class brick should be greater or equal to 10.5N/mm²
7) water absorption of 2nd class brick not greater than 22% of its dry weight

8)Crushing strength / compressive strength of 2nd class brick should be greater or equal to 7 N/mm²