A test is done to assess the quality of concrete by ultrasonic pulse velocity method as per IS: 13311 (Part 1)-1992. The Pulse Velocity by Cross Probing obtained is 4 km/sec Then in which concrete quality grading is it belongs to?

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JKSSB JE (Civil) Official Paper (Held On: 19 Nov, 2023)

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Answer 1

Explanation:

Pulse Velocity = 4.0 km/sec:
As per IS 13311 (Part 1): 1992, when the ultrasonic pulse velocity lies between 3.5 km/sec and 4.5 km/sec, the concrete is classified as of Good quality.
Cross Probing Method:
In this method, the transmitter and receiver are placed on opposite faces of the concrete, providing reliable internal condition assessment.

Additional InformationUltrasonic Pulse Velocity (UPV) Method

UPV is a non-destructive technique used to evaluate concrete's homogeneity, quality, and presence of internal flaws.
IS Code Reference:
The classification as per IS 13311 (Part 1):1992 is:
- > 4.5 km/sec → Excellent
- 3.5 – 4.5 km/sec → Good
- 3.0 – 3.5 km/sec → Doubtful
- < 3.0 km/sec → Poor
Applications:
UPV is used in assessing existing structures, checking uniformity, and detecting cracks, voids, and honeycombing.
Advantages:
- Non-destructive, quick, and simple to perform
- Helps in structural health monitoring without damaging the concrete
- Can be used for quality control during construction or investigation of deterioration in old structures