Magnitude of frost grip as a function of water content, porosity, temperature and particle shape

The effect of water content on the magnitude of frost grip is investigated for two sands, an angular, uniform sand and a natural sand of better gradation. The influence of the material to which the frozen soil adheres is also checked.;The influence of the depth of the molds used in the laboratory work on the experimental results is investigated and analysed.;Using two soil mixes the influence of silt and clay size particles on the relationships previously deduced is investigated. A soil mix is also used to determine if the rate of freezing has any effect on the results.;The influence of porosity of the soil is investigated in the next stage of the work, and these results, in conjunction with the results of the initial stage, allow a mathematical analysis over the theoretical range and the development of a general equation in the practical range of porosity and water content.