Subsurface and Environmental Triggers of Crack Recurrence in RCC Buildings: A Hybrid Field Analysis

This study investigates the environmental and geotechnical causes behind recurrent cracking in reinforced cement concrete (RCC) structures. Drawing on field data from 40 case studies across Tamil Nadu and Karnataka, the paper explores the correlation between soil type, drainage provision, foundation systems, and crack recurrence. Using a hybrid methodology that combines statistical analysis with engineer-led field insights, the study identifies clayey soils and lack of drainage as key contributors to high-severity, recurring cracks. Chi-square tests and Cramér’s V validate the observed relationships. The findings advocate for integrating environmental variables into RCC diagnostic protocols, and propose a field-applicable Environmental Diagnostic Priority Matrix to guide structural monitoring and intervention strategies