3001/JWO/01/E3

Scope of Work: Structural Audit to RCC Over Head Tank Bldg No. P-80 (ex-PCTC) and MH- 1/1 (3 TB, ASC South). Total = 02 Nos

Surveying the RCC Over Head Tank (OHT) visually to assess damage caused to the façade, members walling etc. Conduct Non Destructive Tests in staircase areas RCC walls/ beams, slabs, soffits and all such locations pointed by consultant record the data, assess and compile the structural status report of the listed structures comprising results of visual observations. ND Test methodology of trappers material specifications and approximate quantity of items etc.

Carbonation Test: To identity depth of carbonation of concrete.

Methodology: Chemical reaction of the concrete surface to a phenolpthalein based staining agent is recorded at varying depth at the same location. The first depths are test which shall be carried out in close proximity to the surface strength profile test locations to note the densification effect of carbonation on surface strength.

Half Cell Potential Test: To define the corrosion potential of RCC sections where steel bars are exposed.

Methodology: Continuity of steel is assumed/ checked prior to testing. One re-bar needs to be exposed to act as a one point. This is connected to the Copper Sulphate half-cell through a millimeter. The other point of the half cell is directly connected at various locations on the concrete surface, which is pre wet. Completions of circuit give a reading on the millimeter, which is the potential difference between the tested points. High negative difference indiates that the corrosion potential is maximum various readings are taken within a close grid at equal interval of 150 or 300mm centre. Contours are then drawn to indicate areas with varying corrosion potential.

Ultra Pulse Velocity Test: To evaluate integrity of the concrete.

Methodology: The test is based on measuring the time taken for an ultra sonic pulse for an ultra sonic pulse to travel through known length of concrete. Variation in the concrete such as honeycombing, lack of compaction cracks, voiding etc cause an increase in the transit time.The equipment comprises two piezoelectric transducer one an emitter the other a receiver. These are coupled to a signal generator and a recording device, which displays transit time. The probes are place against the structure to be examined in one of the three configurators and the transit time measured. The three configurations are direct method, indirect method and semi-direct method. The ultra pulse velocity is calculated from the formula below:-

UPV = Path Length / Transit Time

Rebound Hammer Test: To assess strength of concrete cover.

Methodology: Rebound Hammer is pressed against the concrete surface to take the reading coming of the instrument defecting strength of the surface to take prescribed pressure.

Core Test:

Distress Mapping: All distresses indentified are ascertained in tubulised form and remedial measures are given with items description, material specification, aprroximate quantity and market rates.

Consultation if required at the time on going execution whenever necessary.

ND Tests inclusive of preparation of surface, labour, machinery mobilisation & all taxes

Submit report for methodology and recommendation for carrying out rehabilitation work alongwith detailed eastimate in duplicate.

Cost quoted should be inclusive of scaffolding, men, machinery etc for carrying out the requisite test.

Structural report should be vetted by IISC/ IIT/ NIT/ State Govt Engineering College.

MRUDASHISH STRUCTURAL CONSULTANTS PVT LTD

BUREAU VERITAS (INDIA) PRIVATE LIMITED

VAARAAHEE STRUCTURAL REPAIRS AND WATERPROOFING CONTRACTORS

B J MEHTA ARCHITECTURAL AND STRUCTURAL CONSULTANTS PVT.LTD.

Shree Balaji Test House Pvt. Ltd.

Sushuma Consultancy Services LLP

KBP CIVIL ENGINEERING SERVISES

INERTIA ENGINEERING SOLUTIONS