What is LOI in fly ash?

LOI is a measurement of unburned carbon (coal) remaining in the ash and is a critical characteristic of fly ash, especially for concrete applications.

How do you reduce LOI in fly ash?

A thermal processor reduces the loss on ignition of fly ash. The unit heats fly ash, burns off the carbon, and then cools the ash to produce a high-quality product with a constant LOI.

How does fly ash affect compressive strength?

On the other hand, the addition of fly ash reduced the compressive strength of concrete. With the increment of class F fly ash volume, the lack of lime content in the mix led to a low compressive strength. Fly ash in concrete reduces the rate of hydration thus low early compressive strength is observed.

What does Loi measure?

PHYSIO CHEM: OM (LOI), Org. C (LOI) This method estimates soil organic matter based on gravimetric weight change associated with high temperature oxidation of organic matter. After initial oven drying at 105ºC, the samples are ignited in a muffle furnace for 2 hours at 360ºC.

What is Loi test?

From Wikipedia, the free encyclopedia. Loss on ignition (LOI) is a test used in inorganic analytical chemistry and soil science, particularly in the analysis of minerals and the chemical makeup of soil.

What is the maximum allowed LOI content in class N fly ash?

The fly ashes obtained from power plants in Taiwan often have high LOI values exceeding the maximum value of 6\% (which was originally set at 12\%) specified by American Standard Testing and Materials (ASTM) C 618 [24] for use in concrete.

What is LOI test?

How does fly ash enhance the strength and durability of concrete give your own opinion?

Properly cured concrete made with fly ash creates a denser product because the size of the pores are reduced. This increases strength and reduces permeability. Low-carbon fly ash or the use of a better air-entraining agent at a higher-than-usual addition rate can control the problem of freeze-thaw durability.

Does fly ash increases concrete strength?

Fly ash is a pozzolan, a substance containing aluminous and siliceous material that forms cement in the presence of water. When used in concrete mixes, fly ash improves the strength and segregation of the concrete and makes it easier to pump.

What is fly ash How is it harmful?

Fly ash particles (a major component of coal ash) can become lodged in the deepest part of your lungs, where they trigger asthma, inflammation and immunological reactions. Studies link these particulates to the four leading causes of death in the U.S.: heart disease, cancer, respiratory diseases and stroke.