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

Table 1

Cube strength for 7 days and detected crack sizes.

S. no.	Load in	7-day cube compressive strength in N/mm^2	Cracks in mm
1.	50	2.22	0.00
2.	75	3.33	0.00
3.	100	4.44	0.15
4.	125	5.56	0.20
5.	150	6.67	0.30
6.	175	7.78	0.30
7.	200	8.89	0.75
8.	250	11.11	0.75
9.	275	12.22	1.00
10.	300	13.33	1.00
11.	325	14.44	1.75
12.	358	15.91	2.50