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M ,:,,-> <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />TO: Dave Holm <br />b~.-~..e ,g-~6-oZ <br />FRc~w~•. ~mCr <br />~oc• N~w..~: Type V'e2~-eat ~>1~`n. <br />FAX COVER SHEET <br />CO./AGENCY: Water Quality Control Division <br />FAX NO.: 303/782-0390 <br />FROM: Allen Sorenson <br />MESSAGE TO RECIPIENT: <br />Dave, <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br />Bill Owens <br />Governor <br />Greg E Watcher <br />Executive Director <br />Ronald W. Cattany <br />Acting Division Director <br />Included with this fax are some pages that I pasted together from a number of sources <br />describing cement chemistry and concrete mixing as it relates to sulfate resistance. The <br />Executive Summary is that the cement ingredient susceptible to sulfate attack is <br />tricalcium aluminate. Type V cement specification is described in ASTM C150-02, which <br />limits the allowable percentage of tricalcium aluminate in the cement. Sulfate resistance <br />of concrete is further enhanced by using a low water/concrete ratio and by adding <br />pozzolan to the mix to reduce porosity and permeability of the concrete. <br />Thanks for the San Juan County update yesterday; let me know if DMG can do anything <br />to facilitate progress in the Animas Basin. <br />-Allen <br />DATE: 8!16/02 NUMBER OF PAGES TO FOLLOW: <br />PROGRAM: MINS. X <br />COAL AML <br />TIME TO BE SENT: ASAP X or NIGHT RATE <br />3 <br />M. SAFETY <br />c:\My Documents\cemev[ Eax. doc <br />