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Q. |
Sleepers (ties) are mostly made up of |
A. | wood |
B. | prestressed concrete |
C. | metal |
D. | steak |
Answer» B. prestressed concrete | |
Explanation: prestressed concrete is a form of concrete used in construction which is “pre-stressed” by being placed under compression prior to supporting any loads beyond its own dead weight. this compression is produced by the tensioning of high-strength “tendons” located within or adjacent to the concrete volume and is done to improve the performance of the concrete in service. |
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