The combustion of pulverised coal at high temperatures and pressures in power stations produces different types of ash.
The ‘fine’ ash fraction is carried upwards with the flue gases and captured before reaching the atmosphere by highly efficient electro static precipitators. This material is known as Pulverised Fuel Ash (PFA) or ‘fly ash’. It is composed mainly of extremely fine, glassy spheres and looks similar to cement.
The ‘coarse’ ash fraction falls into the grates below the boilers, where it is mixed with water and pumped to lagoons. This material, known as Furnace Bottom Ash (FBA) has a gritty, sand-like texture.
The use of PFA and FBA in construction has been established for decades. Applications range from providing the cementitious material in concrete, to use as a simple fill material or a lightweight aggregate in the manufacture of blocks.
Using PFA and FBA makes a positive contribution to the environment. PFA and FBA are used in many applications to replace OPC (Ordinary Portland Cement) & naturally occurring aggregates and minerals respectively, which can reduce significantly the demand for OPC & virgin aggregates.
Making Earth Greener
One of the greatest benefits of utilising fly ash is building a greener future.
Fly ash in itself is a waste product and it is a huge problem for disposal. From each power station, thousands of tons of fly ash are pumped into the ash lagoons every day. These fly ash lagoons are occupying millions of acres of agricultural land all over India.
Fly Ash : A Win – Win Solution
When we replace every single ton of cement with fly ash, we are not only eliminating waste from our planet but also we are reducing the emission of 0.85 tons of CO2 into our atmosphere.
This is a unique Win – Win solution offered by fly ash and it is no wonder that Fly Ash is at the forefront amongst the green technologies being now adopted all over the world by leading organisations.
Fly ash is a byproduct of power generation with coal. Sustainable ash utilization is one of the key concerns.
Fly ash is ideal for use in the manufacture of cement, concrete, concrete products, cellular concrete products, bricks/blocks/ tiles etc.