Research Article IoT-Based Intelligent System for Internal Crack Detection in Building Blocks J. Chinna Babu, 1 M. Sandeep Kumar, 2 Prabhu Jayagopal , 2 V. E. Sathishkumar , 3 Sukumar Rajendran, 2 Sanjeev Kumar, 4 Alagar Karthick , 5 and Akter Meem Mahseena 6 1 Department of Electronics and Communications Engineering, Annamacharya Institute of Technology and Sciences, Rajampet, 516126 Andhra Pradesh, India 2 School of Information Technology and Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu 632014, India 3 Department of Industrial Engineering, Hanyang University, Seoul, Republic of Korea 4 Department of Civil Engineering, Graphic Era (Deemed to Be University), Bell Road, Clement Town, 248002 Dehradun, Uttarakhand, India 5 Renewable Energy Lab, Department of Electrical and Electronics Engineering, KPR Institute of Engineering and Technology, Coimbatore, 641407 Tamil Nadu, India 6 Department of Electrical and Electronic Engineering, Daffodil International University, Ashulia, Savar, Dhaka 1207, Bangladesh Correspondence should be addressed to V. E. Sathishkumar; srisathishkumarve@gmail.com and Akter Meem Mahseena; aktermeem.m@yahoo.com Received 27 February 2022; Revised 20 April 2022; Accepted 24 May 2022; Published 13 June 2022 Academic Editor: Awais Ahmed Copyright © 2022 J. Chinna Babu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Cracks that are detected in concrete structures represent significant damage, and they can lead to a detrimental effect on the structure’s durability. Their identification in a timely manner can help ensure structural safety and guide in-depth maintenance operation. Automatic detection of such cracks has been proposed using internal crack detection utilizing ultrasonic sensors in concrete. Cracks within the concrete can be detected using ultrasonic sensors. In this investigation, we introduced an intelligent method that is aimed at developing a crack detection scheme using ultrasonic sensors. These ultrasonic sensors are used for the detection of cracks in buildings which cannot be seen with our naked eyes; they are capable of alerting authorities via SMS message and providing the cracks’ location via GSM and GPS modules. To monitor internal cracks in the concrete cubes and cylinders, the ultrasonic sensors can be fixed at the centre of the cube which will be used for interval crack monitoring based on crack detection technology. The grade of concrete used for testing is M 25 , and it is well mixed with the ingredients of cement, fine aggregate, coarse aggregate, and water. The concrete is placed in the cube moulds having the dimensions 150 mm × 150 mm × 150 mm. The cylinders used in the case of the experimental analysis are of the dimensions of 150 mm diameter and 300 mm height. These specimens are cast and kept in the curing tank for 28 days to attain the maximum strength. After completion of the curing period, the specimens were taken out from the tank and weighed. After this weighing process, the cubes and cylinders are about 8.884 kg and 13.399 kg, respectively. The information about the cracks can be displayed on the LCD, and also, the transmitted short message about the cracks can be exchanged between the devices using IoT. 1. Introduction Concrete is the most often utilized material in the world for numerous civil infrastructure projects such as bridges and buildings. They are safely constructed by superimposing the various loads to the foundation, but their structural integrity is compromised by a variety of operating environ- mental factors. As a result, their strength is critical in nature, maintaining a high level of safety structures and durability, and their efficiency factors are critical because civil Hindawi Journal of Nanomaterials Volume 2022, Article ID 3947760, 8 pages https://doi.org/10.1155/2022/3947760