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JUFI-2F.-1992 n9:21 FROf1 R1901,1ESTAR IJOP.TH VALLEY TO 16 15104626283 P.05 <br /> EXERM <br /> Technical UM <br /> CHEMICAL COMPARISON OF FLY ASH Number 7 <br /> AND PORTLAND CEMENT <br /> The chemical composition of fly ash is amorphous (glassy) due to rapid cooling <br /> very similar to that of portland cement those of cement are crystalline formed by <br /> The table below shows typical com- slower cooling <br /> pound analyses for two fly ashes and a natural 2. The major difference between fly ash <br /> pozzolan(Class F Fly Ash Class C Fly Ash and and portland cement is the relative quantity of <br /> Class N - Nalural) and ordinary Portland each of the different compounds, Portland <br /> cement A glance at the table reveals: cement is rich in lime(CaO) while fly ash is <br /> 1. The :nine compounds exist in fly ash low, Fly ash is high in reactive silicates while <br /> and portland crme-nt Those of fly ash are portland cement has smaller amount& <br /> TYPICAL CHEMICAL COMPOUNDS <br /> IN POZZOLANS AND PORTLAND CEMENT <br /> CHEMICAL POZZOL4N T1.10 <br /> COMPOUND CLASS F CLASS CCEMENT <br /> Si0 54.90 39.9022.60 <br /> A120� '25.80 16.704.30 <br /> F'e,O,t 6.90 5.802.40 <br /> Cal) 9.70 24.3061.40 <br /> Mgl) 1.80 4.602.10 <br /> SO,, 0.60 3.302.30 <br /> NA2O k r2O 0.60 1.300.60 <br /> The tapir ilhiMmic: IIIc hasic chemical durable cementing compounds no different <br /> difference. Portland cement is manufactured from those formed during hydrationo(ordinary <br /> %vith CaO some of n'hich is released in n frrr portland cement. <br /> slate during hvdration.Asmuch a%20rionnd:: Antvicwnthe chcmistryofboth materials <br /> DI Irec lime is relcascd during the hydration of makes it quite apparent that a blend of the two <br /> 100 pounds of cement 'I his liberated lino• will MnhAnca the concrete product and effi- <br /> forms thr neec::nry ingredient for reaction cienlly utilize the properties of both. <br /> with fly ash silicates to form strong and <br /> ORDINARY <br /> PORTLAND CEMENT F AGGREGATES } WATFR CONCRETE <br /> VFF L.v.mlc+.u.w�lu m�.ln.ce InMm c,mvru1 <br /> FREE LIME <br /> QUALITY <br /> I ,r <br /> PORTLAND CEMENT IL CONCRETE <br /> f <br /> AGGREGATES I WATER + FREE LIME + FLT ASH ADDITIONAL <br /> CEMENTITIP, COMPOUNDS iiii� <br /> t <br /> US <br /> For further hilunna ion or specific questions about the chemistry of fly ash, contact your <br /> nearest Pozzolanic technical representative. <br /> Al Aavn . FRITIPH CCILUAIe1A - CALIFORNIA . COLORA00. IUANO. MONTANA <br /> NEVADA . OREGON . MUTH DAKOTA • WADIIINGTON . WYOMINn . UTAM <br /> TELEPHONELOCAL 232.8320. INF111F WASHINGTON Ie00!56P.5 194 <br />