WBPWDR/EE/BHD-I/ENIQ-4/26-27/1

Concrete Core Strength Extraction of concrete core (75 mm dia & up to 150 mm depth ) using Rebar locator, preparation of the sample with the necessary capping and conducting compressive strength test of the concrete core as per relevant IS Code from any NABL accredited laboratory and submission of test reports in 6(six) copies with making necessary arrangement of temporary barricading at the test location and clearing the site after test all complete including all incidental charges and taxes.

Chemical Analysis Determination of sulphate content of the concrete core as per relevant IS code from any NABL accredited laboratory and submission of the test reports in 6(six) copies all complete including all incidental charges and taxes

Determination chloride content of the concrete core as per relevant IS code from any NABLaccredited laboratory and submission of the test reports in 6(six) copies all complete including all incidental charges and taxes.

Removal of existing 80mm thick concrete wearing coat over bridge deck by manual means before extraction of concrete core.

Epoxy bonding of new concrete to old concre

Supplying preparing and placement of ready mix non shrink cementitious micro concrete having no metallic aggregate or chlorides for filling up the core location after extraction from bridge deck. The micro concrete should achieve compressive strength not less than 10 Mpa after 24 hours, 40 Mpa after 7 days and 50 Mpa after 28 days at 30degree Celcious. It should have unstrained expansion in between 1% to 4 %, flexural strength should not be less than 5 Mpa after 28 days. Micro Concrete should have a co-efficient of thermal expansion similar to that post concrete. The laying of micro concrete should be done with proper workmanship so that it matches with the adjacent formation level, complete in all respect including all incidental charges and taxes.

Extraction of concrete core (75 mm dia & up to 150 mm depth) using rebar locator, preparation of the sample and determination of carbonation depth as per relevant IS code from any NABL accredited laboratory and submission of test reports in 6(six) copies with making necessary arrangement of temporary barricading at the test location and clearing the site after test all complete including all incidental charges and taxes.

Conducting Concrete tomography (CT) from a single device using Enhanced Onsite Wireless 2D/3D Imaging Based on 24 Channel Pulse Echo Transducers Acquiring Concrete Scan In One Go with Wide Panoramic B-scan, Augmented Reality & 3D views, Al-Assisted Positioning, Feature Interpretation & Image stabilizer confirming to EN 12504-4. To carry out concrete diagnostics which can be used for improved quality assurance/ quality control during concrete structures construction and assist in rehabilitation decision making, complete in all respect including all incidental charges and taxes.

9. Galva Pulse: Advanced Reinforcement Corrosion Assessment of RCC Elements. Conducting residual life analysis of RCC structures by measuring rate of corrosion ICore value for the give RCC element by Conducting adequate Nos. of tests for the condition assessment of RCC elements by non electrical connection to rebar type, high precision sensor based, wireless testing tool for detail corrosion evaluation which will provide in situ details of:- 1) Measurement of corrosion rate in Reinforcement. 2) Measurement of Real in situ Electrical resistivity of Concrete. 3) Measurement of accurate in situ Corrosion potential of Rebar. 4) Clear cover of Concrete. 5) Residual Life analysis can done. 6) Rate of loss of cross section of steel rebars inside concrete. 7) Contours of corrosion potential in RCC Element (Mode of Measurement: Per point comprising of mapping of size max 1000 X 1000), complete in all respect including all incidental charges and taxes

Drone Videography of the Bridge: Site visits by qualified and experienced civil engineer for visual inspection by videography using X6 Plus Drones- Multi rotor (Quad Copter) and submission of videography of the structure including photographic evidence (in 6 copies) and Preparation of Distress drawings (in 6 copies) including structural crack- crack mapping using crack gauge, identifying delamination, spalling/ honeycombed areas, damp locations, discolorations etc. Marking damaged areas on drawing for record and future references, complete in all respect including all incidental charges and taxes.