What is Pozzolana Reaction?
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What is Pozzolana Reaction?
AdityaBhandakkar
The chemical reaction occurs in the Portland cement when pozzolans are added and react with water is called a pozzolanic reaction.
In this reaction is silica, its precursors, with the absence of cementing properties, converts into a calcium silicate with good cementing properties.
In chemical terms, the pozzolanic reaction occurs when calcium hydroxide, also is known as Portland. It reacts with silicic acid 248 calcium silicate hydrate. (C-S-H)
CA(OH2) + H4SiO4 ——-> CaH2SiO4.2H2O
The pozzolanic reaction is a long term reaction that includes silicic acid, water, and CaO. This may be irreversible. The high amount of free calcium and pH 12 or above must be needed to initiate the pozzolanic reaction.
mechanical test and the chemical test is performed to check the activity of pozzolanic reaction.
Himanshu joshi
Pozzolana is a waste of materials obtained from various manufacturing plants.
There are various types of pozzolana, such as Fly ash, Blast Furnace Slag, Silica Fume, Rice husk, etc.
Fly ash is a waste product obtained from coal-burning thermal power plant. Blast Furnace Slag is obtained from the manufacturing of pig iron and so on.
These pozzolanas are siliceous and aluminous material and not cementing material; it shows, when used in cement manufacturing and used as partial replacement of cement clinker it saves cost.so when water is added to such pozzolana cement, it shows cementing property by the formation of c-s-H gel which helps in strength gains. This action is pozzolanic action.
nikeetasharma
Pozzolanic reaction is the reaction which continue to occur as long as calcium hydroxide is present, there is sufficient water for the reaction to occur, and there is available space for the reaction products to reside.