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JUN-26-1992 09: 19 FROM OWHE9TAR IIORTH VALLEY TO * 15104626283 P.03 <br /> Technical o LI EMH <br /> WHAT IS FLY ASH? Number 3 <br /> TheAmerican Society ForTest- Type F <br /> Ing and Materials defines pozzolan 1. Most effectively moderates <br /> as "a siliceous or siliceous and heat gain during concrete curing <br /> aluminous material which in itself and is therefore considered an <br /> possesses little or no cementitious ideal replacement for some cement <br /> value, but will, in finely divided in mass concrete, and high strength <br /> form and in the presence of mois- mixes. For the same reason,Type F <br /> ture, chemicallymactwith calcium is the solution to a wide range of <br /> hydroxide at ordinary temperatures summer concreting problems. <br /> to form compounds possessing 2. Provides sulfide and sulfate <br /> cementitious properties". resistance equal or superior to <br /> Types F and C fly ash processed Type V cement. Type F is often <br /> and distributed by Pozzolanic are recommended for use where con- <br /> by-products of the combustion of crete. may be exposed to sulfate <br /> coal in large power plants. Pozzo- ions in soil and ground water. <br /> lanic fly ash is collected in electro- Type C <br /> .antic precipitators or bag houses, 1.Most useful in"performance" <br /> then classified by precise particle mixes, prestressed applications, <br /> size,thus assuring a uniform,qual- and other situations where higher <br /> ity product. early strengths are important. <br /> Type F flyash is available In the 2. Especially useful in soil <br /> largest quantities, Produced when stabilization since Type C may not <br /> either anthracite, bituminous or require the addition of lime. <br /> sub-bituminous coal is burned, For additional information or <br /> Type F is generally low in lime, specific questions about fly ash, <br /> usually under seven percent, and contact your nearest Pozzolanic <br /> contains a greater combination of technical representative. <br /> silica, alumina and iron (greater <br /> Ihxn 70 perc.(-.ld) t11an Type C fly <br /> ash. <br /> Type C fly ash normally comes <br /> from lignite sub bituminous <br /> coal. These types of coal may <br /> produce an ash with higher lime <br /> contents — generally more than 15 <br /> percent — often as high as 30 <br /> percent. This gives Type. C unique <br /> self-hardening characteristics. <br /> Where as both types of fly ash <br /> impart a wide range of qualities to <br /> many types of concrete, they differ <br /> chiefly in the following ways: <br /> ALASKA • BRITISH 601 IIMRIA . CALIFORNIA • COLORADO IDAHO . MONTANA <br /> NEVADA • OREGON • SOUTH DAY.UTA . WASHINCTON • WYOMING • UTAH <br /> TFI FFHONE LOCAL 2329320,INSIDE WASHINGTON 19001 RA2-AI oe <br />