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By C. B. Wilby

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Additional resources for Structural Concrete. Materials; Mix Design; Plain, Reinforced and Prestressed Concrete; Design Tables

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23. 05 m 3 . 24. To obtain the weight of the oven-dry aggregates when aggregates are to be batched in an oven-dry condition for a trial mix, the weights of the saturated surface-dry aggregates derived from calculations C5 are multiplied by 100/(100 + A) 38 Properties of materials and mix design where A is the percentage by weight of water needed to bring the dry aggregates to a saturated surface-dry condition. The amount of mixing water should be increased by the weight of water absorbed by the aggregates to reach the saturated surface-dry condition.

Some are also available crimped or with indented surfaces. The wires usually need to be degreased before use either with carbon tetrachloride or by allowing them to rust very slightly and then removing any loose rust. Some favour the latter with plain wires (ones not provided with a mechanical bond) as the rust pitting can increase bond. The author consistently found both methods unsatisfactory for certain laboratory tests of beams with 2 mm diameter plain wires and reliably cured this trouble by using crimped wires.

Lightness and economy can be assisted by the use of precast concrete floor and roof units. Generally, they are less expensive than in-situ floors and roofs, but the supporting beams lose efficiency and generally the structure is less robust. The great advantage and economy of the continuity of beams and framing action of in-situ work is reduced. Prestressed concrete tends to be economic mainly when the depth allowed is inadequate for reinforced concrete construction. The weight problem when overcome in a design automatically gives other advantages in the final structure, such as high natural frequency, easily spread small point loads and damping of small vibrations.

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