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What is Thermo-electric prestressing
We know that, stretched tendons are used in prestressed concrete. Stretching of tendons may be accomplished by using jacks or by other means. Thermo-electric prestressing is just another method of stretching the tendon wiers. We know that if we increase the temperature of a metal, it expands. As the name suggests, in Thermo-electric prestressing, temperature of tendon wires is increased by passing electric current for a short duration. This temperature increase, taking place within 3-5 minutes, may be of an order of 300-400°C. The bars, which may undergo an expansion of about 0.4-0.5% in length, try to shorten at cooling butare checked by fixed anchors at the two ends.
Maintenance of Water Bound Macadam Roads:
Softening Point Test: The temperature at which bitumen softens is determined by the "Ring and Ball" test (Figure). (a) Diagram of Apparatus at Beginning of Test (b
centroid of shaded area
After measuring the anticipated traffic for the bridge, cement/reinforced- with- rebar stanchions are spaced over the freeway to accommodate the bridge. An 'off-ramp' from the free
4. Calculate the loose volume of material needed to fill in the trench as sketched below. The following information is also known: [7] o Length of trench = 250 m o Trench
problems in estimating especially in reinforcement works
how to construct road in hilly areas
Explain briefly shallow foundation?
manufacture of cement by dry process
LOSS OF PRESTRESS DUE TO SHRINKAGE OF CONCRETE We know that concrete shrinks in volume when it dries up. This volume reduction takes place in the form of reduction of all dime
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