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Problem 1:
a) Zinc is often used as a coating on steel reinforcement. Explain two ways in which the zinc coating can protect the reinforcement. What would happen if the coating was nicked.
b) Compare the effectiveness of the zinc coating with a typical epoxy coating on reinforcement. How does the epoxy coating protect reinforcement and what happens if the coating is nicked.
Problem 2:
Rank the following materials based on their ability to act as a sacrificial anode on iron. Should any of the materials not be used?
Potassium
Aluminum
Zinc
Lead
Platinum
The road is in good condition and is initially dry, but it becomes wet 160 ft before the stalled car (and stays wet until the car is reached). What is the minimum distance from the stalled car at which the driver could apply the brakes and still s..
An old wooden telephone pole with a single cross member was blown off center during a recent storm. To temporarily stabilize the telephone pole, a repair crew has attached a cable from the end of the cross member to an eye-ring stake anchored in t..
If a mass of 500kg is placed centrally on the top face of the buoy, find the maximum height of its centre of gravity above the bottom of the buoy so that the buoy may remain in stable equilibrium.
A fire hydrant is supplied through a 6 inch cast iron pipe of 16,000 feet length. The total drop in pressure is limited to 35 psi. What is the discharge through the pipe for a water temperature of 80°F ((kinematic viscosity) = 0.93 × 10-5 ft2/sec)
You are given a mohrs circle with 10 kPa (assume positve since geotech question) in compression for sigmaz and 2 kPa (+ counterclockwise) force for shear z. This force lies on a plane 15 degrees CW.
two cars, connected by a cable, are winched up an incline using a second cable. the incline makes an angle of 25 degrees with the horizontal, and the winch rises another 30 degrees above the incline.
Determine a composite SCS runoff curve number for a 600-acre basin that is totally within soil group C. The land use is 40 percent contoured row crops in poor hydrologic condition and 60 percent native parture in fair hydrologic condition.
A 100-ft steel tape of cross-sectional area 0.0025 in^2, weight 2.3 lb, and standardized at 68 degrees F is 99.992 ft between end marks when supported throughout under a 12-lb pull.
Water at a pressure of 13 atm, at street level, flows into a building at 3m/s through a 6 cm diameter pipe. The pipe tapers down to a 2 cm diameter by the top floor 50 m above.
A horizontal pre-stressing force of 500kN is applied to rectangler beam. the beam has a depth of 500mm and a width of 250mm. the force is applied at a distance of 80mm below the x-x axis.
The belt starts from rest at time t=0 and its speed increases at a constant rate of 150mm/s^2. Knowing that the coefficient of static friction between the pacakges..
what value for Fy are the two forces F1=4i+Fyj+20K(N) and F2=8i-5j+7k(N) perpendicular to each other
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