Castle Fly Ash is a high quality product used as an additive in cement and concrete mixes to improve strength, decrease permeability, sulphate attack and shrinkage.

It will also increase workability, decrease bleeding and reduce the heat of hydration.

The spherical shape of ash partciles and their finess has a beneficial effect on the workability of concrete. The shape allows for concrete to move more freely and the fine particle size allows better filling of voids and less water is needed.

Fly Ash produces more cementitious paste. The greater the percentage of flyash particles in the paste, the better lubricated the aggregates are and the better the concrete flows. Fly Ash reduces the amount of water needed to produce a given slump. The spherical shape of fly ash particles provides water-reducing characteristics similar to a water reducing admixture.

Finishers notice the improved texture when working and also notice fewer holes and less segregation.

Fly ash improves corrosion protection. By decreasing concrete permeability, Fly Ash can reduce the rate of ingress of water and corrosive chemicals; therefore protecting steel reinforcements from corrosion.
Fly Ash increases sulphate resistance and alkali-silica reactivity. This reduces calcium hydroxide, which combines with sulfates to reduce gypsum, which in turn reacts with alkali hydroxides in Portland cement making them 'unavailable' for reaction with reactive silica in aggregates.

Many applications exist where rapid heat gain of cement increases the chances of thermal cracking, leading to reduced concrete strength and durability. Replacing large percentages of cement with Fly Ash can reduce the effects of thermal cracking.

Fly Ash is a recycled material that, when used, has a positive effect on the environment in two specific ways:

Fly Ash use decreases landfill disposal. Coal fired power plants are a major source of energy in this country. The Fly Ash that is not used in indusry and recycled is disaposed of in landfills, which has associated costs.

Fly Ash decreases emmisions. greenhouse gases are released into the atmosphere by many ways, one of which is the production of cement. The cumulative impact of producing one ton of cement is the release of one ton of CO2 into the atmosphere. Replacing cement in concrete applications with Fly Ash has the potential of reducing the CO2 that is released into the atmosphere through cement production.

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