Exam 22: Concrete Construction-I Formwork, Reinforcement, and Slabs-On-Ground

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How does a vapor retarder under a concrete slab- on- ground affect the stresses caused by the shrinkage of the concrete slab?

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A vapor retarder, being a plastic sheet, provides a slip membrane, reducing the friction between the slab and the ground. Consequently, the slab is able to move more freely, reducing tensile stresses due to shrinkage.

In a typical site- cast reinforced- concrete structure, the cost of formwork and shores is

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C

Height adjustability in shores made of dimension lumber

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C

Scaffold- type shores are generally made from

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A reinforced concrete column has vertical bars, referred to as longitudinal bars. Does a column need any other form of steel?

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The tendons used for prestressing a PT concrete slab- on- ground generally consist of

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Explain what a construction joint is.

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Explain what a form- release agent is.

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Aluminum is commonly used as form and shore material because

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A PT concrete slab- on- ground may either be a ribbed slab or a constant- thickness slab.

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The strength of concrete in a residential concrete slab- on- ground is generally

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High- density overlay (HDO)on form plywood

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List various types of reinforced- concrete slabs as described in this text, and explain the essential differences between them.

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What are the advantages of prestressing?

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A doubly reinforced beam is one in which

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A construction joint in a concrete slab- on- ground is required if the concrete in the slab cannot be placed in one continuous operation.

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Stirrups are generally made of

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Name the items of the equipment used to pull the prestressing strands.

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Explain what reshoring is.

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What is the function of a drainage layer under a concrete slab- on- ground?

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