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Define Non-destructive inspection of Concrete Substructures?
If there is evidence of significant deterioration, then a Level III inspection, involving either non-destructive or destructive tests, may be required. Some of the NDT equipments that can be used for underwater examination of concrete are:
- Rebound Hammer
- Ultrasonic system
- Magnetic Rebar Locator
Each instrument consists of an underwater sensor connected to a topside deck unit through an umbilical cable. The deck unit contains the signal conditioning electronics and data acquisition system. To operate the instrument, the diver has to position the underwater sensor on a previously cleaned portion of the structure surface, and person topside operates the data acquisition system in order to collect and store the data.
Explain the Hydraulic Gradient A measurement of the movement of water over distances. Change in hydraulic head from one monitoring point to another. i = ΔH/L units are typ
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Q. Show the Silt curtain touching seabed? Silt curtains are impermeable vertical barriers extending from seawater surface to their designed depths. Curtains are held in a verti
State an expression for 'zero air-void line' and illustrate the line for a specific gravity of 2.65. What are the various factors that affect the compaction of soil in the field
Calculate the Horizontal Distance A surveyor's total station measured slope distance near station 3245+26.35 is recorded as 437.380-m with a zenith angle of 118º 48' 07" and a
Explain the AASHTO Classification System 1. Identify the percent passing the No.10, No. 40, and No. 200 sieves. Identify the LL and PI of the fraction passing the No. 40 sie
Explain briefly shallow foundation?
A rectangular concrete beam is subjected to a factored moment (Mu) of 345 kip*ft. The beam has the following properties: f'c = 5500 psi fy = 60,000 psi h = 39 in
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