Comparative Study of the Cementitious


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Title: Comparative Study of the Cementitious

Author(s): P.C. Aitcin, F. Autefage,A. Carles-Gibergues, and A. Vaquier

Publication: Special Publication

Volume: 91


Appears on pages(s): 91-114

Keywords: volume); fly ash; hydrationphysical properties; pozzoldiffraction; x-ray flourescbituminous coal; chemical analvsis:; lignite; particleans; specific surface;ence.density (mass/size distribution;sulfates; x-ray

Date: 2/1/1986

According to ASTM Standard C 618-84, fly ashes can be classified into two broad categories depending on their chemical composition. If Si02 + A1203 + Fe203 > 70%, the fly ash is said to be Class F; if 50% < Si02 + A1203 + Fe203 < 70%, it is said to be Class C. The physico-chemical properties of three Class F fly ashes - one French, one Canadian and one American - and of four Class C fly ashes - two American and two French - have been investigated. It has been found that fly ashes from one particular class can behave very differently. Two Class F fly ashes have been found to be pure1 Y Paz pozzolanic, whereas three others, one F and two C, were more or less hydrauli c at an early stage of hydration before behaving like a more or less pozzolanic material. One Class C French fly ash has been found to be hydraulic, then "auto-pozzolanic"; that is, in the presence of water, tis dissolution liberates enough lime to react with its own silica and alumina. Another Class C French fly ash was found to be hydraulic but non pozzolanic, its reactivity with the lime being directly associated to the formation of ettringite.these fly ashes has been explained In each case, the reactivity of by analyzing formation mechanisms of the different hydrates.