Engineering Solutions in Practice

A 22-year-old residential tower in Gurugram presented widespread concrete spalling, rebar corrosion, and active leakage across multiple floors. The Residents' Welfare Association required a comprehensive assessment and remediation plan that could be executed without relocating residents.

CFS conducted a full structural audit using rebound hammer testing, ultrasonic pulse velocity measurements, half-cell potential surveys, and carbonation depth profiling across all structural elements. The investigation confirmed advanced carbonation-induced corrosion in columns, beams, and slabs on floors 3 through 14, with chloride contamination in the basement car park.

A phased rehabilitation programme was designed and executed: (1) removal of all delaminated concrete and corrosion products, (2) application of corrosion inhibitor to exposed reinforcement, (3) reinstatement of concrete cover using polymer-modified repair mortar, (4) application of anti-carbonation coating to all external surfaces, and (5) crystalline waterproofing treatment to the basement. Works were sequenced floor by floor to maintain resident access throughout.

All structural elements were restored to their design capacity. Post-remediation NDT confirmed concrete strength compliance and negligible corrosion activity. The building received a clean structural health certificate from the local municipal authority. A five-year maintenance protocol was established and handed over to the RWA.

A school campus in Chennai comprising three blocks constructed in the 1980s required seismic assessment and retrofitting to comply with current IS 1893 seismic zone requirements. The school required all works to be completed without interrupting the academic calendar.

Structural drawings were obtained and verified against as-built conditions. A detailed seismic vulnerability assessment was conducted, including pushover analysis of the existing frame. The investigation identified soft-storey conditions in Block B and inadequate column-beam joint detailing across all three blocks.

The retrofitting strategy comprised: (1) RC jacketing of ground-floor columns in Block B to eliminate the soft-storey condition, (2) addition of shear walls at strategic locations in Blocks A and C, (3) strengthening of column-beam joints using carbon fibre reinforced polymer (CFRP) wrapping, and (4) improvement of foundation connections. All works were executed during school holidays and weekend shifts.

Post-retrofitting analysis confirmed compliance with IS 1893 Zone III requirements. The campus received structural clearance from the Tamil Nadu Education Department. The project was completed within the contracted timeline and budget, with zero disruption to the academic programme.

A multi-level basement car park in a commercial complex in Kochi experienced persistent water ingress through construction joints, floor slabs, and retaining walls, causing active corrosion of structural reinforcement and creating safety hazards for users.

A detailed investigation was conducted using half-cell potential mapping, chloride content profiling, and water pressure testing of all joints. The investigation identified the primary ingress points as failed waterstops at construction joints and inadequate concrete cover to reinforcement in the retaining walls.

The remediation programme included: (1) injection grouting of all active cracks and construction joints using polyurethane and cementitious grouts, (2) application of crystalline waterproofing slurry to all internal surfaces, (3) installation of drainage channels and sump pump system at B2 level, (4) corrosion inhibitor application and concrete repair to all areas of active corrosion, and (5) protective coating to all structural elements.

Water ingress was eliminated within the first monsoon season following completion. Post-treatment half-cell potential surveys confirmed a significant reduction in corrosion activity. The car park was returned to full operational use. A 36-month performance warranty was provided, backed by a scheduled maintenance programme.

A Grade II heritage-listed building in Thiruvananthapuram required comprehensive structural rehabilitation while preserving its architectural character and complying with heritage conservation guidelines. The owner required an independent project management consultant to oversee the specialist contractor.

CFS conducted a pre-intervention condition survey documenting all structural and architectural elements. A heritage impact assessment was prepared in consultation with the Kerala State Archaeology Department. The investigation identified critical structural deficiencies in the timber roof structure, masonry walls, and foundation.

CFS acted as Project Management Consultant, preparing the detailed scope of works, contractor tender documents, and quality assurance plan. During execution, CFS provided full-time site supervision, material testing oversight, and progress reporting to the owner. All interventions were designed to be reversible in accordance with heritage conservation principles.

The rehabilitation was completed within the approved scope, timeline, and budget. The building received a heritage compliance certificate from the Kerala State Archaeology Department. The owner received a comprehensive as-built documentation package and a long-term maintenance plan.