Common questions

What is capillary porosity?

What is capillary porosity?

Capillarity Porosity represents the STORAGE CAPACITY of the geologic material and is the ratio of the volume of holes/openings to the total volume of the material.

What is capillary pores in cement?

In the initial stage of cement hydration, the capillary pores are all connected, and the cement matrix has a high permeability. With the increase of the degree of hydration, capillary pores decrease in volume and size and start to become disconnected; as a consequence, the permeability decreases as well.

How do you calculate capillary porosity?

Capillary porosity is determined by finding the volume of water retained in soil at 50 cm tension. The non capillary porosity is determined by subtracting the value of capillary porosity from the total porosity value.

What is the porosity of concrete?

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Porosity is a measure of the volume of voids in concrete. Permeability is the rate of flow of moisture through concrete under a pressure gradient. Voids through which moisture can move must be interconnected and of a certain size. Discontinuous pores and pores with narrow entrances retard flow of moisture.

What is non capillary porosity?

The non-capillary pore space was designated as those pores that would not hold water tightly through capillary forces but would permit the percolation of water and the ready entrance of air.

What are capillary voids?

Capillary voids are spaces formed by the shape of the hydrated cement gel structures and spaces left between the gel structures as water is used in the self-desiccation of the hydration process.

What is non-capillary porosity?

What is the size of capillary pores in concrete?

3.2. Pore Structure and Its Influence on Drying Shrinkage

Name Diameter Description
Capillary pores 50–10 nm Medium capillary pores (large capillary pores)
10–2.5 nm Small, independent capillary pores (small capillary pores)
Gel pores 2.5–0.5 nm Micropores
≤0.5 nm Mezzanine space

What is the size of the capillary pores in concrete?

Is porosity good for concrete?

The porosity of concrete has influence on the properties in many aspects. Composition of concrete, casting in practice, maturing and hardening, cement reactions and risks at freezing, all are influenced by porosity. The possibilities to influence the type of porosity are important.

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How do you find the porosity of concrete?

The ratio of mass difference divided by the concrete volume is considered as porosity.

What is the size of non-capillary pores?

As the water-filled, non-capillary pores (RDP) have diameters ≥28.8μm (r≥ 14.4 μm), so it is expected that rc divides the RDP into laminar (Re1 at r = 14.4 – 95 μm) and non-laminar (Re>1 at r> 95μm) water flow.

What are capillaries in concrete?

Capillaries are very minute holes and exist in concrete. Water rises into these holes, which is called capilarry porosity. The height of rise depends on the continuation this pores. That is why it is preferable to give 75 to 100 mm cover for substructure, depending on the deleterious materials in the soil and ground water.

What is meant by porosity of concrete?

Porosity is the number of pores in a material for instance pores in certain concrete. Porosity is usually expelled in volume percent. The porosity of concrete has influence on the properties in many aspects. Composition of concrete, casting in practice, maturing and hardening, cement reactions and risks at freezing, all are influenced by porosity.

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What is the difference between capillary action and porosity?

Porosity – It is defined as the phenomenon of seeping out of the fluid through the interconnected voids that the media carry. Capillary Action- It is the driving force that lead that seepage to occur coz of adhesive action. But, it is significant only if the pores are very tiny.

Is concrete porous or nonporous?

Concrete is a porous material, though the extent of those pores depends on the type of concrete. It’s impossible to create concrete that is not porous due to the materials it’s made of and evaporation, but the size of the pores can be controlled a bit. All concrete is porous, but some batches are more porous than others.