Construct · 1 fields · 1 citations

laitance: a standalone construct

One name. One construct. A landmark on the map.

● anchor · one construct, one field Nearest construct by meaning·not indexed
laitance1 CONSTRUCTLaitanceNEVILLE · WEAK SKIN

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Concrete technology

A weak, dusty skin of fine particles brought to a concrete surface by bleed water

In concrete technology laitance is the thin, weak layer of cement and fine particles carried to the surface of fresh concrete by rising bleed water, which on hardening leaves a soft, dusty, porous skin. Neville's Properties of concrete explains that this layer is poorly bonded and low in strength, so it must be removed before a bonded topping, a new lift, or a surface treatment is applied, or the joint will fail there. The referent is a specific surface defect of the finished material, distinct from bleeding (the process that produces it) and from efflorescence (a salt deposit), and it does not carry a meaning in any other field.[1]

Unit
Thickness and strength of the fines-rich surface layer
Recovery means
Removed by scabbling, grinding, or acid etching before bonding further material; reduced by limiting bleeding
Measured by
Detected by surface pull-off or scratch tests and by visual inspection of the laitance skin before overlaying

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Nearby constructs

honeycomb2 fields · 2 citationsjingle · one word, two constructscarry1 fields · 1 citationsanchor · a standalone construct

References

  1. Neville, A. M. (2011). Properties of concrete (5th ed.). Pearson Education. ISBN 9780273755807

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