TERMIUM Plus®

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SHRINKAGE FACTOR [2 records]

Record 1 2008-11-12

English

Subject field(s)
  • Roofs (Building Elements)
  • Inspection for Defects (Materials Engineering)
DEF

Surface cracking due to oxidation and shrinkage stresses, which shows as repetitive mounding of an asphalt surface, resembling the hide of an alligator.

CONT

Although heat is also a factor in the deterioration of asphalt on a roof, the real source of decay is the energy carried by the ultra-violet(UV) light of the sun, combined with the ready supply of oxygen in ozone. The "links" in asphalt molecular chains are hydrogen. The molecular bond is overcome by the strong attraction of the oxygen, which pulls the hydrogen away from the asphalt molecules. This process is called photo-oxidation, and these breaks in the "aliphatic" chain results in the shrinkage cracking common to asphalt. This phenomenon is commonly called "alligatoring" in roofing parlance, a term which describes the similarity of aged asphalt surfaces to an alligator's back.

French

Domaine(s)
  • Toitures (Éléments du bâtiment)
  • Détection des défauts des matériaux
DEF

Durcissement et rétrécissement causés par l'oxydation des enduits bitumineux exposés, qui produisent de petits monticules entre des fissures profondes qui donnent l'aspect d'une peau de crocodile.

Spanish

Save record 1

Record 2 1990-11-30

English

Subject field(s)
  • Earthmoving
CONT

Grading is the process of moving soil to change the form of the land. Cutting is the removal of soil and filling is the addition of soil. Shrinkage factor is the volume of soil lost after cut material is placed as fill. It is usually desirable to balance the cut and fill at a site. Exporting or importing soil is a costly operation compared to moving soil on site. The cost of moving soil at the site is about 1/6 that of importing soil and about 1/3 that of exporting soil, unless of course the export material may be sold. Another reason to avoid importing soil is to avoid complications which may result from mixing different soil types.

French

Domaine(s)
  • Terrassement
CONT

Voici quelques conseils pratiques relatifs aux terrassements qui créent le relief : autant que possible, choisir le niveau d'un plan à 1/2 pente de la partie du terrain considéré. On équilibre ainsi déblais et remblais; (...) une fouille de 0,50 m de profondeur donne, compte tenu des remblais provenant des déblais, une dénivellation de 1 mètre.

Spanish

Save record 2

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