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In particular, air permeability is almost universally used in the cement industry as a gauge of product fineness which is directly related to such properties as speed of setting and rate of strength development. Other fields where air permeability has been used to determine specific surface area include: Paint and pigments; Pharmaceuticals
Although the Blaine air permeability method is often preferred, due to its simplicity and low cost, the nitrogen BET method is also used. When hydrated cement hardens, the calcium silicate hydrate (or C-S-H ), which is responsible for the hardening reaction, has a large specific surface area because of its high porosity .
Ground granulated blast furnace slag is a latent hydraulic binder forming calcium silicate hydrates (C-S-H) after contact with water. It is a strength-enhancing compound improving the durability of concrete. It is a component of metallurgic cement (CEM III in the European norm EN 197).
A standardised testing procedure is crucial for various fabrics as it uncovers fundamental qualities such as warmth in blankets and air resistance in parachute cloth. [30] The air permeability test method is for measuring the ability of air to pass through textile materials. [31] ASTM D737-96 alternative test method is; ISO 9237:1995
The pressure drop across the sample and the flow rate are measured and permeability is calculated using Darcy's law. Normally, either nitrogen or brine can be used as a fluid. When high rates of flow can be maintained, the results are comparable. At low rates, air permeability will be higher than brine permeability. This is because gas does not ...
Amid growing anxieties surrounding reported drone sightings, the FBI has issued a warning against a new trend of pointing lasers at aircrafts.
Vicat's cement is an artificial hydraulic lime, and is considered the "principal forerunner" [3] of portland cement. The name portland cement is recorded in a directory published in 1823 being associated with a William Lockwood and possibly others. [ 6 ]
The bird flu outbreak has taken concerning turns, with more than 60 human cases confirmed. Experts outlined four signs that the virus is going in the wrong direction.