Tag Archive for Tag: Freeze-thaw in concrete

Tag: Freeze-thaw in concrete Freeze-thaw in concrete Moisture state

The volume expansion occurring on conversion of water to ice and associated water movement cannot be accommodated in fully saturated concrete. The drier the concrete, the more capacity it has to absorb the pressures associated with ice formation and water flow under hydraulic and osmotic influences. Thus minimising the degree of saturation of the pore structure is an important controlling

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Tag: Freeze-thaw in concrete Freeze-thaw in concrete Porosity and permeability

Porosity and permeability are not proportionately linked. Although highly permeable concrete is generally frowned upon, it is interesting that high porosity concrete has the advantage of providing safety valves for ice to expand into, assuming that the concrete is not saturated. This is the basis of air entrainment as a control measure. However, low permeability concrete, derived from low water/cement

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Tag: Freeze-thaw in concrete Freeze-thaw in concrete Key factors

Four key factors of influence on deleterious freeze-thaw behaviour are the porosity/permeability, aggregate characteristics, moisture state and climatic conditions. In the case of highway structures, deicing agents will also be significant and this is discussed in the next section. The maturity of concrete when it first freezes is, of course, also an issue. In addition to the key factors discussed

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