With advent in technology, Non-Destructive Testing (NDT) has created a niche in structural health monitoring without damaging the serviceability of the structure. NDT are very useful in inspecting, testing, evaluating materials and components for determining the condition of the in-situ structure. Thereby, forming the basis for devising repair methodology.
We have an experienced team dedicated for carrying out NDT. We have following equipments:
We have an experienced team dedicated for carrying out NDT. We have following equipments:
These tests are carried out to ascertain:
UPV tests are carried out in accordance with Indian Standards: IS-13311 (Part I)
The tests are performed to measure the velocity of the ultrasonic pulse in the in-situ concrete using the instrument used to ascertain the concrete quality.
Interpretation of the result :
Pulse velocity | Concrete Quality |
---|---|
>4.0 km/s | Very good to excellent |
3.5 – 4.0 km/s | Good to very good, slight porosity may exist |
3.0 – 3.5 km/s | Satisfactory but loss of integrity is suspected |
<3.0 km/s | Poor and loss of integrity exist |
These tests are carried out to ascertain:
Rebound Hammer tests are carriedout in accordance with Indian Standards: IS-13311 (Part II)
The tests are performed by pressing the hammer against the concrete and released to get a reading. The reading is read against the curve to get the compressive strength of concrete.
Interpretation of the result:
Average Rebound | Quality of surface hardness/ Strength |
---|---|
>40 | Very good |
30 – 40 | Good |
20 – 30 | Fair |
<20 | Poor and / or delaminated |
0 | Very poor and/or delaminated |
These tests are carried out to ascertain:
Half-Cell Potential tests are carried out in accordance with ASTM C876 (1991) Standrad.
These tests include a voltameter used to measure the difference in potential between the reinforcing steel and a copper sulphate electrode in contact with the concrete surface. The value of potential difference provides with an indication of the presence or absence of active corrosion in the rebar.
Interpretation of the result:
Measured Potential (mV CSE) | Probability of active corrosion |
---|---|
> -200 | Less than 10% |
-200 to -350 | Uncertain |
< -350 | More than 90% |
These tests are carried out to ascertain:
The higher values of either pH or Chloride (Cl) or Sulphate (SO3) content than the permitted level as per the Indian Standard Code indicate the presence of environment where the probability of corrosion of rebar is higher than normal.
The results are compared with the permissible limits of Indian Standard: IS-456 (2000)
Premissible Limits as per IS 456 (2000):
pH | Not less than 8 |
---|---|
> Cl (kg/m3) | For PCC; maximum 2.0 kg/m3 of Cl For RCC; maximum 0.5 kg/m3 of Cl |
SO3 (mg/l) | Maximum 0.4 mg/l |
These tests are carried out to ascertain:
Core tests are carried out in accordance with Indian Standards: IS:1199 and IS:516
Core sample is extracted from the structural member using a core cutting machine. The sample is then tested in the laboratory post core surface preparation is complete. Before testing the sample in Compressive Testing Machine, the prepared core sample is cured. The result thus obtained is corrected using applicable correction factor and converted to equivalent cube strength as per the Indian Standards.
+91 8451072218
+91 9867790953
C1/107, Rajgad CHS Ltd., Sarova Complex, Samta Nagar, Kandivali (E)
Mumbai 400101.
sccepl@hotmail.com