Abstract
ABSTRACT Huge amounts of fly ash - a substance that does not conform to the ASTM C618 classification due to its chemical properties - have been abandoned in landfills around the world, despite their self-cementing property. It has not been used in concrete making applications due to its large amounts of free lime and sulfate contents. The fly ash in these plants is dumped in landfills, causing serious environmental hazards. Fly ash is disposed to the landfills by belt conveyors after being humidified with water. Therefore, the fly ashes humidified in the landfill areas are hydrated in nature. This hydration is further intensified in landfills by rain and snow. Thus, the free lime content of fly ash decreases due to its long hydration process. In this work, the lightweight masonry blocks were produced by mixing normal and hydrated fly ashes or normal, hydrated fly ash and lime without Portland cement. The compressive strength, water absorption, sorptivity, density, porosity, and thermal conductivity values of the samples produced were determined. The results obtained from these tests showed that lightweight masonry blocks could be produced by using these waste materials in building applications.
Highlights
Electricity demand has increased in recent years due to the increase in the worldwide population and industrialization
Depending on the type of coal burned at the plant, different classes of fly ash (FA) are obtained as waste material
The normal fly ash (NFA) and the hydrated fly ash (HFA) from Kangal Power Plant were used as the main materials in the production of samples
Summary
Electricity demand has increased in recent years due to the increase in the worldwide population and industrialization. A large part of the electrical energy generated in the world is obtained from the burning of coal in thermal power plants (GUPTA, et al, 2020). Depending on the type of coal burned at the plant, different classes of fly ash (FA) are obtained as waste material. While FA with high SiO2 (S) amounts shows pozzolanic property, FA with CaO (C) higher than S amounts exhibit both pozzolanic and cementing properties. FA with pozzolanic properties effectively converts the calcium hydroxide (CH) formed by the hydration of Portland cement (PC) to the calcium silicate hydrate (C—S—H), thereby increasing both the strength and durability of the concrete. FA with both the pozzolanic and cementing properties is being used effectively in the concrete industry
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