Document - 2.pdf

Canadian Standards Association

Precast concrete — Materials and construction

November 2009

Quirk

— a reveal or false joint between two adjoining corner surfaces to mask mitred or cold joints.

Sandwich wall panel

— a wall element consisting of two wythes of concrete separated by a layer of

insulation.

Sealer (protective coating)

— a material for coating precast concrete elements to improve resistance

to water penetration or improve weathering qualities.

Set-up

— the preparation of forms or moulds for casting, including placing of materials before placing of

concrete.

Shop drawings

— all drawings prepared by the manufacturer for production.

Note:

See

Clause A.3.3

Smoothness

— the degree to which a surface is locally flat.

Strand

— a group of wires laid helically over a central core-wire.

Note:

A seven-wire strand consists of six outer wires laid over a single wire core.

Strand anchor

— a device for holding a strand under tension.

Note:

Sometimes called a “chuck” or “vice”.

Stress-resistant form

— a form provided with suitable end bulkheads and sufficient strength to resist

the total prestressing force.

Stripping

— removing a precast concrete element from the form in which it was cast.

Supplier

— the party supplying materials or components to the manufacturer.

Surface retarder

— a material used to retard or prevent hardening of the cement paste at a concrete

surface, thereby facilitating removal of the paste after curing.

Sweep

— a variation in horizontal alignment from a straight line parallel to centreline of a concrete

member.

Note:

Also called “horizontal bowing”.

Tendon

— a high-strength steel element consisting of one or more wires, strands, or bars or a bundle of

such elements, used to impart prestress to the concrete.

Tolerance

— the permissible variation from the specified requirements.

Transfer strength

— the minimum concrete strength specified for the individual concrete elements

before the prestressing force can be transferred to them.

Note:

Sometimes called “detensioning strength” or “release strength”.

Veneered construction

— the application of two different concrete mixes in one element.

Notes:

(1)

An example is a special architectural face mix and a standard backup mix.

(2)

This term can also refer to the attachment of other materials (e.g., cut stone pieces, to a concrete panel).

Warping

— the twisting of a concrete member, resulting in an overall out-of-plane curvature of surfaces,

characterized by non-parallel edges

Licensed for/Autorisé à Jed Friesen Sold by/vendu par CSA on/le June/18/2015.

~Single user license only. Storage, distribution or use on network prohibited. Permis d'utilisateur simple seulement.

Le stockage, la distribution ou l'utilisation sur le réseau est interdit.