Ultra Fine Micro Flyash Introduction

A Class F fly ash source produces processed fly ash, known as ultrafine fly ash. The classifier removes the coarse particles from the parent ash while collecting and storing the fines separately. Ultrafine fly ash has a peak size of 10 microns and an average particle size of 2 to 4 microns. In contrast, raw or unprocessed ash has an average particle size of roughly 20 to 30 microns and is the highest at 100 microns. This smaller size gives the concrete mix the reactive surface area, resulting in higher early strengths and lower permeabilities.

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It is not necessary to preload the ultrafine fly ash into the mixer when creating a concrete mix using it. To ensure that the concrete is homogeneous throughout the concrete mix, this material does not require any additional or special mixing techniques. Fly ash can be mixed with ultrafine fly ash and administered in addition to regular fly ash dosage.

Depending on the specific performance required, typical dosages of ultrafine fly ash vary from 8 to 12 percent of the total cementitious. The normal extra rate in a high-strength application is 8 to 9 percent. Depending on how low a permeability target is set for the project, dose rates for low permeabilities typically vary from 9 to 12 percent


Concrete that is resistant to salt intrusion, freeze-thaw abrasion, chemical assault, weathering, and other service conditions is said to be durable. The salts are what cause the reinforcing steel to corrode. The concrete cracks as the rusting reinforcing steel enlarge. The longer the salts can be kept away from the steel, the longer it can be used before cracks appear and maintenance becomes necessary.

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