+91 98335 30200  ·  sales@tcreng.com
The underside of a long concrete box-girder viaduct, piers marching into cold mist

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 Quote

Overview

500-plus bridges assessed for Maharashtra PWD through robotic NDT, structural audit, and rehabilitation engineering plus the Statue of Unity, the world’s tallest statue, tested through construction with L&T. Working from from National Highway and Expressway to Stadium and Public Building.

Key takeaways

  • 10 plant sections and 7 damage mechanisms covered on this page, from National Highway and Expressway to Stadium and Public Building.
  • Reported against Bridge. IRC SP 35 (inspection and maintenance of bridges); IRC SP 18 (inventory and condition survey); IRC SP 40 (rehabilitation of bridges); full standards coverage matrix below.
  • 7 marquee engagements documented on this page; 12 published technical insights tagged to this sector.

Overview

POTENTIAL FAILURES WE SERVICE: Bridge, flyover and highway-structure distress, foundation settlement, and corrosion in ageing reinforced concrete. TCR investigates carbonation- and chloride-induced reinforcement corrosion, prestress-tendon stress corrosion cracking and grout voids, fatigue at steel connections, bearing and expansion-joint failure, 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, and fatigue at steel details.
  • 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.

Working on Bridges as per IRC SP 35 (inspection and maintenance of bridges); IRC SP 18 (inventory and condition survey); IRC SP 40 (rehabilitation of bridges)

Industry Context

Infrastructure spending has reached a scale where asset condition is an investment-grade question. NHAI recorded its highest-ever capital expenditure of about Rs 2.5 lakh crore in FY25 and monetised Rs 28,724 crore of built assets through InvIT and toll-transfer structures in the same year.

  • Capex scale: NHAI recorded its highest-ever capital expenditure of about Rs 2.5 lakh crore in FY25 and monetised Rs 28,724 crore of built assets.
  • Why monetisation changes the brief: institutional investors buying twenty-year concessions demand independent, documented evidence of structural condition, not the builder's assurance.
  • Pipeline: approximately INR 1.7 trillion across FY24 to FY30 under the National Infrastructure Pipeline framework.
  • Roads: the Ministry of Road Transport and Highways and NHAI capex, around 12,000 km of national-highway construction a year at peak, plus the Bharatmala Pariyojana programme.
  • Urban and monumental: municipal roads, water supply, sewerage and street lighting, Clause 77 structural audit across Mumbai's 30,000-plus building stock, and the Statue of Unity and Statue of Oneness programmes.
  • Emerging scope: solar-PV mounting structures on highway-corridor land, and electric-vehicle charging infrastructure on national highways.

Monetisation changes the inspection equation: institutional investors buying twenty-year concessions demand independent, documented evidence of structural condition, not the builder's assurance. TCR provides that evidence layer, with more than 500 bridges inspected including underwater robotic scope, statutory structural audits, GPR and UPV subsurface mapping, pavement evaluation, and NABL-accredited materials testing that stands behind every number reported.

The Indian infrastructure capex programme runs to approximately INR 1.7 trillion across FY24-30 under the National Infrastructure Pipeline framework.

The Ministry of Road Transport and Highways carries the National Highways Authority of India (NHAI) capex (~12,000 km of national-highway construction per year at peak), the Bharatmala Pariyojana programme, and a steady backlog of bridge and ROB/RUB construction. The state highways and rural roads programme (Pradhan Mantri Gram Sadak Yojana) continues.

Urban infrastructure (metro rail covered under Section 11i; municipal roads, water supply, sewerage, street lighting; structural audit under Maharashtra Clause 77 with Mumbai's 30,000+ building stock as the headline scope) carries the city-government buyer pool.

The flagship monumental construction programme (Statue of Unity, Statue of Oneness) brings capex-grade materials and NDT testing scope.

Solar-PV mounting structures on highway-corridor land brings structural-steel testing for module-mounting structures (cross-vertical with Civil and Steel). Electric-vehicle charging-station infrastructure on national highways brings small-cell foundation engineering and electrical-asset structural verification (cross-vertical with Automotive). The Indian Government's hydrogen-fuel-station rollout for hydrogen-fuelled trucking on the highway corridor brings cross-vertical hydrogen-storage and pressure-vessel scope (cross-vertical with Pipelines and Refining). The shift from diesel-traction railway crossings to electrified crossings reduces ROB / RUB structural-load profiles. The growing climate-resilience capex (flood-resistant bridge design, scour-mitigation engineering) brings sub-water bridge-pier inspection volume.

The strategic positioning carries: TCR is the materials-testing, NDT, and structural-audit bench for the Indian infrastructure capex pipeline, with the 500+ bridge book of work as the proof point and the BMC March 2026 robotic underwater 400+ programme as the next-generation anchor.

Plant Sections We Inspect

ClusterEquipment / Material
National Highway and ExpresswayPavement (flexible bituminous, rigid concrete), embankment, sub-grade, cross-drainage works
State and District RoadPavement, ROB / RUB, culvert, side drain
Bridges and ViaductsBox girder (segmental and cast-in-place), composite girder, cable-stayed and arch, prestressed concrete sleepers and girders, bearings, expansion joints, deck slabs
Sub-water bridgeBridge pier (concrete and steel tubular), abutment, intake structure, jetty pile (cross-vertical with Marine Section 11f and the BMC robotic underwater 400+ programme)
TunnelNATM and TBM, segmental lining, waterproofing membrane, drainage system
Monumental ConstructionReinforced-concrete shell, steel cladding, structural-steel core, foundation engineering
Structural AuditBuildings older than 30 years (Maharashtra Clause 77), heritage structures, industrial sheds, gantry rails, plant buildings (cross-vertical with Civil Section 8)
Drainage and Civic InfrastructureManhole and gully top per BS EN 124-5 up to 900 mm; sewer; storm-water drain
Urban Civic AssetReinforced-concrete water tank, elevated service reservoir (ESR), ground service reservoir (GSR), pumping-station shell
Stadium and Public BuildingReinforced-concrete shell, steel canopy, foundation, post-tensioned slabs

Damage Mechanisms We Investigate

CategoryMechanisms
PavementRutting, cracking, raveling, pothole, shoving, longitudinal cracking, transverse cracking, alligator cracking
Bridge concreteReinforcement corrosion (carbonation-driven, chloride-driven), prestress loss, alkali-silica reaction (ASR), delayed ettringite formation (DEF), creep and shrinkage, freeze-thaw
Bridge steelHAZ embrittlement, weld toe cracking, fatigue at riveted connections, corrosion under coating, thermal-cycling fatigue at expansion joints
BearingWear, corrosion, frozen bearing, neoprene ageing, PTFE wear
Building structural auditReinforcement corrosion, concrete spalling, plaster delamination, settlement-induced cracking, slab punching shear, beam-column joint deterioration
Sub-water bridgeSplash-zone corrosion, submerged-zone corrosion, scour-induced settlement
DrainageManhole 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 (cross-vertical)
IS 456; IS 1343 (prestressed); IS 13311 Part 1 (UPV); IS 13311 Part 2 (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 3597 (manhole covers).
Structural Audit (cross-vertical with Civil Section 8.5)
Maharashtra Clause 77 framework; BIS guidance.
Grout Fatigue
CEB-FIP Model Code 1990 / 2010 (the first-in-India lab capability anchor).

Service Applications Across the TCR Continuum

For infrastructure, the Continuum adapts from the process-plant frame to the built-asset lifecycle: 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 Maharashtra Municipal Corporation Act Clause 77 structural audit forces the question. The rehabilitation window is this vertical's turnaround: traffic diversions and occupancy constraints price every day. Procurement risk sits in cement, aggregate, reinforcement, coupler, and bitumen quality across a fragmented supply base. TCR Engineering services all five adapted stages, anchored by one of the largest NABL-accredited civil testing operations in Western India.

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 free 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 13311 Part 1 and rebound hammer per IS 13311 Part 2, 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 Maharashtra Municipal Corporation Act Clause 77, 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 stability certification, 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

The infrastructure client base spans five groups: government and public-sector bodies, Indian EPC contractors, real-estate developers, the monumental-construction anchors, and international cross-vertical references. Construction majors, bridge and metro builders and the railways are all represented. Each group and its named organisations follow.

India Government and PSU
National Highways Authority of India (NHAI); Ministry of Road Transport and Highways (MoRTH); Public Works Department (Maharashtra PWD anchor; the 500+ bridge 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; Greater Mumbai Civic body framework; State PWDs (Gujarat, Karnataka, Andhra Pradesh, Tamil Nadu, Kerala, Madhya Pradesh, Rajasthan, West Bengal, Odisha); Indian Roads Congress (IRC) standards interface; 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 (cross-vertical with Construction)
Godrej Properties (3-year LRC, all Mumbai Zone, April 2026 onward), Kalpataru, Shapoorji Pallonji, Rustomjee, Lodha, Oberoi, K. Raheja, DLF, Prestige, Brigade.
India Monumental Construction Anchors
Larsen and Toubro for Statue of Unity (Sardar Vallabhbhai Patel); Adi Shankaracharya Statue of Oneness (Madhya Pradesh); Antilia (Mumbai); Wankhede Stadium redevelopment.
International (cross-vertical reference)
Haramain HSR (Mecca-Medina; Section 11i); Master Gas System bridges and crossings (Pipelines & City Gas).

Civil and infrastructure clients span construction majors, bridge and metro builders, and the railways: Afcons Infrastructure, Hindustan Construction Company, J. Kumar Infraprojects, Kalpataru, Shapoorji Pallonji, Patel Engineering, the U.P. State Bridge Corporation, and Bridge and Roof; on the cement and concrete side JSW Cement, UltraTech, and Heidelberg Cement; and on the railway side RITES, Mumbai Metro One, and the Municipal Corporation of Greater Mumbai. The scope covers structural audit, concrete and building-material testing, high-tensile strand and rebar-coupler qualification, and bridge NDT.

Marquee Projects

The infrastructure record runs to more than 500 bridges for Maharashtra PWD, 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.

ProjectService AnchorYear
500+ Bridges Maharashtra PWDRobotic NDT, structural audit, rehabilitation recommendationContinuous
BMC March 2026 robotic underwater bridge programme400+ bridges, AI-assisted underwater inspectionMarch 2026 onward
Statue of Unity, Larsen and ToubroMechanical, chemical, metallurgical, NDT through constructionConstruction era
Statue of Oneness, Adi ShankaracharyaConventional NDT for structural fabricationMultiple
Mumbai Coastal Road ProjectCivil testing, sub-water bridge-pier and abutment inspection (cross-vertical with Marine and Civil)Continuous
Godrej Properties 3-year LRC, all Mumbai ZoneLong-Term Rate Contract for materials testing across Godrej propertiesApril 2026 onward
Kalpataru, Shapoorji Pallonji, RustomjeeLong-Term Rate Contracts for property-development testingContinuous

At the Statue of Unity, TCR carried the mechanical, chemical, metallurgical, and non-destructive verification through construction. 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. The bridge record runs to more than 500 structures inspected across India.

Documents

Download the reference documents for this page. Every file is hosted on this domain and is also listed in the site document library.

  • BMC Roads Department Registration (March 2026)

    Client approval, Brihanmumbai Municipal Corporation

    PDF (498 KB)

  • CIDCO Approval Letter

    City and Industrial Development Corporation of Maharashtra approval for materials and civil testing

    PDF (2.4 MB)

  • RITES

    RITES Ltd Western Region enlists TCR's Mahape laboratory on its approved laboratory list. No. RITES/WR Lab/TCRE, 18 September 2020, signed by H. S. Prasad, Senior Deputy General Manager (Lab).

    PDF (487 KB)

  • L&T - Mumbai Metro

    L&T-STEC Joint Venture audit of TCR's Navi Mumbai materials testing laboratory under the project quality plan for Mumbai Metro Line 3, package UGC-01, contract MM3-CBS-UGC-01 for MMRC. Audit notification 8 March 2021, audit conducted 16 March 2021, with the audit summary report.

    PDF (3.0 MB)

  • Mumbai Coastal Road Project

    AECOM Asia Company Limited, General Consultants for the Mumbai Coastal Road Project, reviews TCR Engineering Services as third-party testing laboratory for Package II, the Baroda Palace to Worli end of the Bandra-Worli Sea Link. Ref MCR2/GCC/220/LL/201515, 31 May 2021.

    PDF (82 KB)

Related insights

13 published insights on this site carry the Infrastructure tag. The 6 most recent are below.

Read all 13 Infrastructure insights →

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 capability per CEB-FIP Model Code, a first-in-India laboratory capability.

Does TCR perform structural audits on ageing buildings?

Yes. Structural audits run under Maharashtra Clause 77 with half-cell potential and carbonation surveys, ground penetrating radar, ultrasonic pulse velocity and rebound hammer per IS 13311, thermography, and residual life certification, producing the condition evidence municipal authorities and societies require.

Inspect the structure before the load finds the flaw.

Request a Quote