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Determine about the Lee-McCall system
In the Lee-McCall system, high-tensile strength bars of diameter varying from 12 to 40 rnrn are used as tendons. These bars are threaded at the ends. After tensioning, each bar is anchored with the help of a nut and a washer held tightly against the end plates. An end plate or a bearing plate is a flat plate bearing directly against concrete. In this anchorage system, loss of prestress due to anchorage slip is eliminated as nuts are tightened well before the tendons are released. At the same time, one drawback is that curved tendons can not be used while adopting this anchorage system. This system of anchorage is shown in Figure.
Types of Pavements: On the basis of structural performance of pavements, there are basically two types of pavements: (a) Flexible, and (b) Rigid. A flexible pavement
Absolute pressure is measured from a vacuum (0 PSI) and atmospheric pressure is14.7PSIa or 14.7 PSI above a vacuum 1PSI on a tire pressure gauge is known as 1PSIg = 15.7PSIa 10PSIg
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How to use plaster cement in sand? Cement sand plaster is a layer of cement & sand mortar that is applied over walls made of brickwork, cement block work, RCC walls and RCC co
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Unsealed contraction joints in concrete pavement For unreinforced concrete pavement, contraction joint is an approximately 3mm wide groove with a depth of about one-third to o
An earthwork contract was awarded to excavate and backfill the foundation of a proposed 50-ft by 50-ft office building. The existing grade elevation is 437.5-ft while the sub-base
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