Sensitivity to frost

from Wikipedia, the free encyclopedia

The frost sensitivity describes the property of a soil or construction material by the action of frost to be damaged. Particularly in soils with a corresponding composition (fine grain fraction, grain distribution , mineral type), ice lenses and layers of ice can form when exposed to water and subsequent frost . This effect is undesirable in the construction of road and path pavements, because the ice lens formation leads to uplift and the road body is damaged on this path.

Frost sensitivity classes

For this reason, soil groups are divided into three classes with regard to their sensitivity to frost. The underlying set of rules are the Additional Technical Contractual Conditions and Guidelines for Earthworks (ZTVE).

class Sensitivity to frost Floor assembly according to DIN 18196 Floor designation
F1 not sensitive to frost GW, GI, GE, SW, SI, SE coarse-grained soils: sands and gravel
F2 slightly to medium sensitive to frost TA, OT, OH, OK, (ST, GT, SU, GU) 1 pronounced plastic clays , organogenic soils, (mixed-grain soils)
F3 very sensitive to frost TL, TM, UL, UM, UA, OU, ST *, GT *, SU *, GU * other fine-grained soils: clays and silts , mixed-grained soils with a high proportion of fine-grained soils

1 belong to F1 if grain size <0.063 mm of 5.0% by weight with a non-uniformity number ≥ 15.0 or 15.0% by weight with a non-uniformity number ≤ 6.0

See also

Norms and standards

  • Additional technical contract conditions and guidelines for earthworks in road construction (ZTVE-StB)

Individual evidence

  1. ↑ Research Society for Roads and Transport: Definitions, Part: Road Construction Technology, 2003, FGSV-Verlag, definition of "frost sensitivity"
  2. ^ Research Society for Roads and Transport: Additional technical contract conditions and guidelines for earthworks, 1997, FGSV-Verlag, page 24