IoT-Based Intelligent System for Internal Crack Detection in Building Blocks

Table 3

28-day cube strength and detected crack sizes.

S. no.	Load in	28-day cube compressive strength in N/mm^2	Cracks in mm
1.	50	2.22	0.00
2.	100	4.42	0.00
3.	150	6.67	0.05
4.	200	8.89	0.10
5.	250	11.11	0.10
6.	300	13.33	0.15
7.	350	15.56	0.18
8.	400	17.78	0.26
9.	450	20.00	0.30
10.	500	22.22	0.53
11.	550	24.44	1.05
12.	600	26.67	1.53
13.	643	28.58	1.85