Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANHECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Rive de Gier TunnelThe Tectoproof waterproofing system

Dr Catherine Larive (CETU)Tony Sichanh (ETANDEX)

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

StakeholdersOwner: French State

Project Managers: CETU & Ministry of Transport

Prime contractor: Etandex Main supplier

ECOMINT – TECTOPROOFCatherine LARIVE, Tony SICHANH

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Description of the tunnel

Located on the highway near Lyon70,000 vehicles per day13% trucks

Tunnel excavated in 1962 Top heading and bench method 82m long, 17m wide, 7.8m high No waterproofing membrane Highly reinforced concrete

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Tunnel deteriorations

Water leakages, damp areas Concrete leaching, calcite stalactites

In winter Icicles, black ice

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Tunnel deteriorations

Rebar corrosion Concrete spalling

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

On-site analysis

Core extraction Water analysis Surface strength analysis

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Laboratory tests

Compressivestrength

Carbonation test Chloride measurements

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Incubation

Destruction

Damagea

Final diagnosis

Rebar corrosion was related to carbonation(due to the change in the concrete pH).

Corrosion started from the inside out. The spread of deteriorated concrete areas

was accelerating.

Time

Corrosion

Initiation

Passivity

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Objectives of repair works

1. Improve user safety: Stop carbonation Repair concrete (no need to add reinforcements) Waterproof the entire tunnel

2. Improve the aesthetics of the side and external walls

… without reducing the height clearance…

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Operation during works

Limited traffic disruptions during works: Works for 7-hour periods during week nights Lanes reopened during the day and all weekend One direction closed during works Two lanes, sometimes one, open in the other direction

Tunnel arch and side wall Tunnel crown

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Repair method

Applying the Tectoproof waterproofing system:a vapour barrier epoxy primer that tolerates a dry, saturated surfacea glass fibre epoxy composite

(possible use of carbon instead of glass fibre for structural reinforcement)

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Repair method

Prior repair works required:Hydro-scrubbing (500 bars) and resurfacing of side wallsHydrodemolition (2500 bars) & scouring of corroded rebarsRepair of altered concrete areas (sprayed repair mortar)

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Repair method

Prior repair works required:treatment of concrete cracks and leakage areasbridging of transverse joints with draining polymeric strips

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

During works

After 5 months of works

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

Total amount = 1 055 626 € incl. Tax.1 619 889 $ (US)

Project Budget

Singapore – 11 November 2016ECOMINT – TECTOPROOF

Catherine LARIVE, Tony SICHANH

An innovativeultra-thin

solution for tunnelwaterproofing and

refurbishment

EfficientCost-effectiveDurableNo traffic disruptionEnvironment-friendlyPreserves initial dimensions

No more concrete spalling,rebar corrosion, leakages,stalactites, black ice…