What is pozzolanic reaction of fly ash?
It is known that the pozzolanic reaction of the fly ash cement paste is the chemical reaction between reactive silica or alumina in the fly ash particles and calcium hydroxide (Ca(OH)2–CH) formed from cement hydration in the presence of water at normal temperature [7].
What is pozzolanic action?
From Wikipedia, the free encyclopedia. The pozzolanic activity is a measure for the degree of reaction over time or the reaction rate between a pozzolan and Ca2+ or calcium hydroxide (Ca(OH)2) in the presence of water.
What are pozzolanic properties?
A pozzolan is a siliceous or siliceous and aluminous material that in itself possesses little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form compounds having cementitious properties.
Which of the following is a pozzolana material?
Explanation: Pozzolana is a material containing silica. PPC is formed by intergrinding ordinary Portland cement, clinker, gypsum and pozzolanic material. 2.
What is the meaning of pozzolanic materials?
Definition of pozzolana : finely divided siliceous or siliceous and aluminous material that reacts chemically with slaked lime at ordinary temperature and in the presence of moisture to form a strong slow-hardening cement.
Is wood ash pozzolanic?
The presence of essential pozzolanic compound (as required by the ASTM C618-15 standard), the content in small size particles, and the large surface area of the particles qualify the wood ash investigated in their study as a pozzolanic material.
What is an example of pozzolanic ash?
Natural pozzolana (pozzolanic ash), silica fume (from silicon smelting), fly ash, and rice husk ash are examples of pozzolans. Silica fume (microsilica) is an amorphous form of silicon dioxide (silica). It is in the form of spherical particles with an average particle diameter of 150 nm.
Is fly ash pozzolanic?
Fly ash is the ash precipitated from the exhaust fumes of coal-fired power stations. It consists mainly of active silica and alumina, with large amounts of glass. The aim of this work was to study the pozzolanic activity of fly ash with lime by means of DTA as a function of the lime content and the curing time.
What is a pozzolanic reaction?
The reaction is known as a pozzolanic reaction. The capacity for the reaction is higher when the pozzolan has a small particle size. Natural pozzolana (pozzolanic ash), silica fume (from silicon smelting), fly ash, and rice husk ash are examples of pozzolans. Silica fume (microsilica) is an amorphous form of silicon dioxide (silica).
Does lime content and curing time affect the pozzolanic activity of fly ash?
The aim of this work was to study the pozzolanic activity of fly ash with lime by means of DTA as a function of the lime content and the curing time. The curves revealed that the rate of hydration, as indicated by the residual lime and hydrated compounds, increases with increasing lime content and curing time.