Industries
Infrastructure
Structural Audit and Subsurface Investigation
The Statue of Unity was tested through construction with L&T, and Mumbai's civic bridges are now surveyed by underwater robots. Between the two sit GPR and UPV subsurface mapping, pavement evaluation and statutory structural audit.
Request a QuoteIn brief
TCR tests, inspects and audits roads, bridges, tunnels and civic structures across India: more than 500 bridges assessed across India through robotic NDT, structural audit and rehabilitation engineering, and the Statue of Unity tested through construction with L&T.
Key takeaways
- 10 asset groups, from national highways and expressways to stadiums and public buildings, and 7 families of damage mechanism are covered below.
- Bridge inspection is reported against IRC SP 35, IRC SP 18 and IRC SP 40; the full standards matrix is below.
- 7 marquee engagements are documented on this page, among them the BMC robotic underwater inspection programme covering over 400 bridges from March 2026.
Overview
TCR investigates distress in bridges, flyovers, highway structures and ageing reinforced concrete, and delivers robotic and underwater bridge inspection with structural audit.
- Structures covered: bridge, flyover and highway-structure distress, foundation settlement, and corrosion in ageing reinforced concrete.
- Mechanisms: carbonation- and chloride-induced reinforcement corrosion, prestress-tendon stress corrosion cracking and grout voids, fatigue at steel connections, and bearing and expansion-joint failure.
- Governing practice: IRC SP 35 for inspection and maintenance of bridges, IRC SP 18 for inventory and condition survey, and IRC SP 40 for rehabilitation.
Industry Context
Infrastructure spending has reached a scale where asset condition is an investment-grade question. NHAI recorded its highest-ever capital expenditure in FY25 and monetised built assets through InvIT and toll-transfer structures in the same year.
- Why monetisation changes the brief: institutional investors buying twenty-year concessions demand independent, documented evidence of structural condition, not the builder's assurance.
- Pipeline: CRISIL projects sustained infrastructure spending across FY24 to FY30.
- Roads: the Ministry of Road Transport and Highways and NHAI capex, around 12,000 km of national-highway construction a year at peak, the Bharatmala Pariyojana programme, a steady backlog of bridge and ROB/RUB construction, and state highway and rural road work under the Pradhan Mantri Gram Sadak Yojana.
- Urban and monumental: municipal roads, water supply, sewerage and street lighting, Section 353B structural audit across Mumbai's ageing building stock, and the Statue of Unity and Statue of Oneness programmes.
- Emerging scope: structural-steel testing for solar-PV mounting structures on highway-corridor land, foundation and structural verification for electric-vehicle charging stations on national highways, hydrogen-storage and pressure-vessel work for hydrogen fuel stations on trucking corridors, and sub-water bridge-pier inspection driven by climate-resilience and scour-mitigation spending.
Independent evidence of condition is what TCR supplies: more than 500 bridges inspected, including underwater robotic scope, statutory structural audits, GPR and UPV subsurface mapping, pavement evaluation, and NABL-accredited materials testing behind every number reported.
Plant Sections We Inspect
| Cluster | Equipment / Material |
|---|---|
| National Highway and Expressway | Pavement (flexible bituminous, rigid concrete), embankment, sub-grade, cross-drainage works |
| State and District Road | Pavement, ROB / RUB, culvert, side drain |
| Bridges and Viaducts | Box girder (segmental and cast-in-place), composite girder, cable-stayed and arch, prestressed concrete sleepers and girders, bearings, expansion joints, deck slabs |
| Sub-water bridge | Bridge pier (concrete and steel tubular), abutment, intake structure, jetty pile; inspected by ROV under the BMC underwater programme of over 400 bridges |
| Tunnel | NATM and TBM, segmental lining, waterproofing membrane, drainage system |
| Monumental Construction | Reinforced-concrete shell, steel cladding, structural-steel core, foundation engineering |
| Structural Audit | Buildings older than 30 years (Section 353B), heritage structures, industrial sheds, gantry rails, plant buildings |
| Drainage and Civic Infrastructure | Manhole and gully top per BS EN 124-5 up to 900 mm; sewer; storm-water drain |
| Urban Civic Asset | Reinforced-concrete water tank, elevated service reservoir (ESR), ground service reservoir (GSR), pumping-station shell |
| Stadium and Public Building | Reinforced-concrete shell, steel canopy, foundation, post-tensioned slabs |
Damage Mechanisms We Investigate
| Category | Mechanisms |
|---|---|
| Pavement | Rutting, cracking, ravelling, pothole, shoving, longitudinal cracking, transverse cracking, alligator cracking |
| Bridge concrete | Reinforcement corrosion (carbonation-driven, chloride-driven), prestress loss, alkali-silica reaction (ASR), delayed ettringite formation (DEF), creep and shrinkage, freeze-thaw |
| Bridge steel | HAZ embrittlement, weld toe cracking, fatigue at riveted connections, corrosion under coating, thermal-cycling fatigue at expansion joints |
| Bearing | Wear, corrosion, frozen bearing, neoprene ageing, PTFE wear |
| Building structural audit | Reinforcement corrosion, concrete spalling, plaster delamination, settlement-induced cracking, slab punching shear, beam-column joint deterioration |
| Sub-water bridge | Splash-zone corrosion, submerged-zone corrosion, scour-induced settlement |
| Drainage | Manhole and gully top fatigue, sewer line corrosion, sub-grade settlement at trench reinstatement |
Standards Coverage Matrix
- Bridge
- IRC SP 35 (inspection and maintenance of bridges); IRC SP 18 (inventory and condition survey); IRC SP 40 (rehabilitation of bridges); IRC 6 (loads and load combinations on bridges); IRC 22 (composite construction); IRC 78 (foundations and substructures); BS 5400; AASHTO LRFD Bridge Design Specifications; Load Testing of Bridges, Eva Lantsoght (2019); FHWA Bridge Inspector's Reference Manual (2022).
- Pavement and Road
- IRC 37 (flexible pavement design); IRC 58 (rigid pavement design); IS 73 (paving bitumen); IS 1206 (penetration); IRC SP 53 (modified bitumen); MoRTH Specifications for Road and Bridge Works.
- Concrete
- IS 456; IS 1343 (prestressed); IS 516 (Part 5/Sec 1):2018 (UPV); IS 516 (Part 5/Sec 4):2020 (rebound hammer); ASTM C39, C496, C617, C876 (half-cell potential), C1383 (impulse-echo); ACI 318, ACI 224 (cracking).
- Reinforcement and HT Strand
- IS 1786; IS 14268; ASTM A615, A416; ACI 318.
- Structural Steel
- IS 800 (general construction in steel); IS 1893 (criteria for earthquake-resistant design); AISC 360; AWS D1.1 (structural welding); AWS D1.5 (bridge welding).
- Tunnel
- IS 4880 (criteria for design of tunnels conveying water); EN 1990 (Eurocode); FHWA Tunnel Design Guidelines.
- Drainage
- BS EN 124-5 (manhole and gully top fatigue); IS 1726 and IS 12592 (cast iron and precast concrete manhole covers).
- Structural Audit
- Structural audit under Section 353B of the Mumbai Municipal Corporation Act 1888; BIS guidance.
- Grout Fatigue
- CEB-FIP Model Code 1990 / 2010, for grout fatigue testing of post-tensioned and prestressed systems.
Service Applications Across the TCR Continuum
For infrastructure, TCR’s five-stage service model follows the life of a built asset: materials qualification, construction quality assurance, in-service condition assessment, repair and rehabilitation, and residual life engineering.
The recurring problems are chloride-induced reinforcement corrosion in coastal structures, alkali-aggregate and sulphate attack, carbonation of ageing concrete, foundation settlement, and the structural distress that accumulates silently until a Section 353B of the Mumbai Municipal Corporation Act 1888 structural audit forces the question. The rehabilitation window is the infrastructure equivalent of a plant turnaround: traffic diversions and occupancy constraints put a cost on every day. Procurement risk sits in cement, aggregate, reinforcement, coupler and bitumen quality across a fragmented supply base. TCR Engineering covers all five stages from its NABL-accredited civil testing laboratory at Mahape, Navi Mumbai.
- Stage One, Materials Qualification (Sourcing and Procurement)
- Construction materials are qualified at intake: cement per IS 4031, aggregates per IS 2386, concrete mix design support, TMT reinforcement per IS 1786, reinforcement couplers per IS 16172 under the BIS-accredited programme, structural steel, bitumen and road materials, soil and geotechnical investigation, and water quality for construction, with sampling by the TCR-branded pickup van across the Mumbai Metropolitan Region.
- Stage Two, Construction Quality Assurance (Construction and Commissioning)
- During construction, TCR provides cube and core testing per IS 516, non-destructive concrete evaluation by ultrasonic pulse velocity per IS 516 (Part 5/Sec 1):2018 and rebound hammer per IS 516 (Part 5/Sec 4):2020, welding inspection of structural steel per IS 800 and AWS D1.1, theodolite-based plumbness and straightness surveys on towers and piers, anchor and fastener pull-out testing, and pavement evaluation on road projects, building the baseline record for the asset.
- Stage Three, In-Service Condition Assessment
- On operating assets, TCR delivers structural audits under Section 353B of the Mumbai Municipal Corporation Act 1888, bridge inspection per Indian Roads Congress codes and the Federal Highway Administration Bridge Inspector's Reference Manual methodology, half-cell potential and carbonation surveys for reinforcement corrosion, ground penetrating radar and subsurface mapping, and thermography of building services, converting visual distress into measured condition.
- Stage Four, Repair and Rehabilitation (Shutdown and Turnaround Equivalent)
- In the rehabilitation window, TCR supports distress mapping and repair specification, cathodic protection of reinforced concrete (see Civil & Structural Testing), load testing of strengthened members, quality assurance on repair materials including micro-concrete and grouts, and post-repair verification by the same non-destructive methods that found the distress, so the intervention is proven, not assumed.
- Stage Five, Residual Life Engineering (Continuum)
- The engineering stage delivers residual life assessment of structures, structural integrity assessment, failure and collapse investigation, engineering design review of strengthening schemes, and the durability studies, chloride profiles, mix optimisation, and coating evaluation, that feed the specification for the next asset.
Named Clients
TCR’s infrastructure clients are government and public-sector bodies, Indian EPC contractors, real-estate developers, cement and concrete producers, metro operators, the owners of monumental structures, and international project references. Across them the scope covers structural audit, concrete and building-material testing, high-tensile strand and rebar-coupler qualification, and bridge NDT.
- India Government and PSU
- National Highways Authority of India (NHAI); Ministry of Road Transport and Highways (MoRTH); Public Works Department (Maharashtra PWD; a long-running robotic NDT programme); Brihanmumbai Municipal Corporation (BMC; Roads Department registration March 2026 onward, plus the AI-assisted underwater 400+ bridge programme); Mumbai Metropolitan Region Development Authority (MMRDA); CIDCO; Pune Municipal Corporation; State PWDs (Gujarat, Karnataka, Andhra Pradesh, Tamil Nadu, Kerala, Madhya Pradesh, Rajasthan, West Bengal, Odisha); U.P. State Bridge Corporation; Bridge and Roof; RITES (PSU consultancy).
- India EPC
- Larsen and Toubro Construction; Afcons Infrastructure; HCC; Patel Engineering; J. Kumar Infraprojects; Tata Projects; IL&FS Engineering; Reliance Infrastructure; Dilip Buildcon; PNC Infratech; KNR Constructions.
- India Real Estate
- Godrej Properties (3-year LRC, all Mumbai Zone, April 2026 onward), Kalpataru, Shapoorji Pallonji, Rustomjee, Lodha, Oberoi, K. Raheja, DLF, Prestige, Brigade.
- Cement and Concrete
- JSW Cement; UltraTech; Heidelberg Cement.
- Metro Operator
- Mumbai Metro One.
- India Monumental Construction
- Larsen and Toubro for Statue of Unity (Sardar Vallabhbhai Patel); Adi Shankaracharya Statue of Oneness (Madhya Pradesh); Antilia (Mumbai); Wankhede Stadium redevelopment.
- International
- Haramain High Speed Rail (Mecca-Medina, through the TCR Arabia joint venture; see Railways); Master Gas System bridges and crossings (Pipelines & City Gas).
Marquee Projects
The infrastructure record runs to more than 500 bridges across India, the BMC robotic underwater programme covering over 400 bridges from March 2026, and full mechanical, chemical, metallurgical and non-destructive verification through construction at the Statue of Unity. Project, service anchor and year follow.
| Project | Service Anchor | Year |
|---|---|---|
| 500+ bridges across India | Robotic NDT, structural audit, rehabilitation recommendation | Continuous |
| BMC March 2026 robotic underwater bridge programme | 400+ bridges, AI-assisted underwater inspection | March 2026 onward |
| Statue of Unity, Larsen and Toubro | Mechanical, chemical, metallurgical, NDT through construction | Construction era |
| Statue of Oneness, Adi Shankaracharya | Conventional NDT for structural fabrication | Multiple |
| Mumbai Coastal Road Project | Civil testing, sub-water bridge-pier and abutment inspection | Continuous |
| Godrej Properties 3-year LRC, all Mumbai Zone | Long-Term Rate Contract for materials testing across Godrej properties | April 2026 onward |
| Kalpataru, Shapoorji Pallonji, Rustomjee | Long-Term Rate Contracts for property-development testing | Continuous |
High-tensile strand for prestressed bridge decks, Mumbai and Pune flyovers and high-speed-rail viaducts is qualified for tensile, stress-relaxation and 2 million-cycle fatigue per IS 14268, ASTM A416 and ISO 15630-3.
Documents
Download the reference documents for this page. Every file is hosted on this domain and is also listed in the site document library.
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Frequently asked questions
How many bridges has TCR inspected?
More than 500 bridges have been assessed across India through robotic NDT, structural audit and rehabilitation engineering, and the BMC programme from March 2026 adds AI-assisted robotic underwater inspection across 400-plus bridges, with sub-water pier and abutment work continuing on the Mumbai Coastal Road Project.
What did TCR test at the Statue of Unity?
TCR carried the mechanical, chemical, metallurgical and non-destructive verification through construction of the Statue of Unity with Larsen and Toubro, a year-long onsite engagement, and delivered conventional NDT for structural fabrication at the Adi Shankaracharya Statue of Oneness.
Which bridge inspection codes does TCR follow?
Bridge work runs per IRC SP 35, IRC SP 18 and IRC SP 40, with loads per IRC 6, alongside BS 5400, AASHTO LRFD and the FHWA Bridge Inspector's Reference Manual methodology, converting visual distress into measured condition for owners and investors.
Can TCR test HT strand for bridges and viaducts?
Yes. High-tensile strand for prestressed bridge decks, Mumbai and Pune flyovers and high-speed-rail viaducts is qualified for tensile, stress-relaxation and 2 million-cycle fatigue per IS 14268, ASTM A416 and ISO 15630-3, with grout fatigue testing per CEB-FIP Model Code 1990 / 2010.
Does TCR perform structural audits on ageing buildings?
Yes. Structural audits run under Section 353B with half-cell potential and carbonation surveys, ground penetrating radar, ultrasonic pulse velocity and rebound hammer per IS 516 (Part 5), thermography, and residual life certification, producing the condition evidence municipal authorities and societies require.