What is Black Cotton Soil?
Black cotton soil (Regur soil) is an expansive clay found extensively in Madhya Pradesh, Maharashtra, Gujarat, and Rajasthan — precisely where major transmission and solar EPC projects are concentrated. It swells when wet and shrinks dramatically when dry.
Key Challenges
Volume changes cause heaving and settlement of foundations. High moisture absorption in monsoon weakens bearing capacity. Open excavations become unstable when saturated. Standard concrete mixes may crack due to differential movement.
Our Solutions
Sonil Buildcon's approach includes pile foundations extending below the active zone, lean mix PCC isolation below pads, granular sub-base backfilling, continuous dewatering during monsoon excavation, and fly ash or GGBS addition to concrete mix for improved durability.
Quality Checks Specific to BCS
Proctor density test for compaction control, swell index testing, daily water table monitoring during excavation, cube testing at higher frequency (every 10m³), and extended curing period (14+ days).