Structural Condition Assessment and Non Destructive Testing NDT of Sanchar Bhawan 20 Ashoka Road New Delhi to Evaluate Structural Adequacy and Load Carrying Capacity for Safe Movement of Fire Tender Vehicles During Fire Emergencies

Phase-I: Visual Survey: Visual inspection for surface damages and damage classification. The visual inspection shall cover all areas of various distress patterns, such as corrosion, moisture, and leakage, including structural and non-structural issues and issues related to the durability of the structure. Visual inspection would be documented in the form of worksheets, photographic records, and distress marked over drawings (if provided by the client). Simple visual survey tools and instruments like cameras with flashlights, chisels, hammers, etc. will be used during the survey. Note: If any additional tools, like laser-based instruments or drones, a hydra, a crane, or any special ladder more than 6 meters, will be required for the visual survey, that needs to be paid separately, considering the extra scope of work. Quantity of distress for BOQ measurement will be also considered another scope of work

Rebound Hammer test for concrete: Uniformity of concrete in terms of surface hardness as per IS ASTM C 805-02, BS 6089:1 981 , BS 1 881 : Part 202, BS-EN:1 3791 , and NIDM reference guidelines or IS 51 6 Part 5 section 4 2020. Note: In the absence of the confirmatory test, estimated strength based on the rebound hammer number will be generated by using the basis of the empirical formula (obtained from the calibration chart or others), but those results will have a 25% variation as per IS 51 6 Part 5 Section 4 2020.

Ultrasonic Pulse Velocity Test for concrete: For ascertaining the quality of concrete, uniformity of concrete in terms of soundness and density of concrete as per ASTM: C597-83, BS 6089: 1 981 , BS 1 881 :Part 203, BSN: 1 3791 , IS 51 6 Part 5 Section 1 201 8.

Half-Cell Potential Test : Measuring the half-cell/surface potentials at selected locations on RCC members of the structures covered under the study to understand the extent of reinforcement corrosion in terms of probable risk of corrosion of steel bars as per ASTM C876, IS 51 6 Part 5, section 2, 2021 . The rate shall include surface preparation and moistening concrete surface

Cover Depth Contour Mapping by Rebar Locator: Conducting a cover meter test at selected locations on RCC members of the structures covered under the study to see the adequacy of concrete cover to rebar as per the relevant design code of the particular structure. An average reading of the cover meter in a 1 50 x 1 50 mm grid line will be considered a single point at one test location. Note:- Interpretation for structural elements follows the code IS 456 for the building, IRC 11 2 for the bridges, IS 3370 Part 1 , and IS 4651 Part 4 201 9 for jetty structure or is specified in the GFC drawing (provided by the client). limitation of machine scanning penetration up to 80 mm depth.

Carbonation or alkalinity test with cover test: Measurement of carbonation depth or alkalinity of concrete by phenolphthalein spray test at selected locations (drilled powder sample or concrete core sample as per site condition) on RCC members of the structures covered under the study to see the depth of carbonation as per IS 51 6 Part 5 section 3 2021 , BS EN 1 4630:2006, and BS EN

Chemical analysis of concrete powder collected from the structure or concrete core sample by drilling to understand the deterioration of the structure due to chemical attack and its effect on reinforcement corrosion with evaluation of the following parameters. a) Water Soluble Chloride Content % (by of mass of concrete) to check the risk of corrosion due to present chloride % as per IS: 1 4959 (Part 2) — 2001 , B.S. 5328 Part 1 , ACI 201 .2R-92, BS 1 881 Part 1 24:1 988, BS 811 0, IS 456:2000 b) pH Value (to check alkalinity of concrete) as per relevant B.S. 5328, ACI 201 .2R-92, ACI-31 8-99, IS 456:2000, BS 811 0 c) Acid Soluble Sulphate Content % (by of mass of cement) to check risk of column buckling (due to volume increment of concrete) as per relevant BS 5328 code, BS 1 881 Part 1 24:1 988, BS 811 0, and IS 456:2000 Note:- Chemical profile has not been included in this scope of work

Core Extraction, Sampling, and Testing: Extracting the concrete core samples following the codal provisions and evaluating the properties (fck value, grade of concrete) in the laboratory from the core samples selected. IS 456:2000; IS 51 6 Part 4 201 8; IS 11 99:2002; ASTM C-42, without encountering any steel reinforcement (by ferro-scanner) from the RCC members covered under the study at specified locations by the site in charge with portable power-driven core cutting equipment.

Report Submission with root cause analysis, interpretation, conclusion, and recommendation: Preparing and submitting a comprehensive report consisting of findings from visual inspection, test data, interpretation of results, conclusions, and final recommendations along with a sketch indicating the location of the test. Note 1 :- The recommendation part does not include the repair scheme/DPR or BOQ related to the project. Note 2:- Editable format of report The HD-quality site photographs and Video shall be provided to employer in a good quality of CD/DVD/USB hard disk along with a soft copy, but any data generated from the patented software can not be edited so those files can not be provided in the editable format like graphs, design output, backend algorithms, etc.

Tensile Strength Analysis/Yield Strength Analysis/Elongation of Steel Members:- To analyze the the tensile strength of existing steel members/steel bar and knowing the properties of steel members in terms strength, grade, ultimate strength, ductility and effect of ages on the properties of the steel section. Note:- Minimum 600 mm Sample size or following diagnosis codal requirement will be cut from the questionable portions/manufacturing lot of the steel members.