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7-74-04; 77:40 ;Lester Bulldin� ;3203955376 # 5/ 28 <br /> Article Request Page Page 3 of 26 <br /> General Approach <br /> Six galvanized steel tanks were filled with sand in the Agricultural Engineering Laboratory at the <br /> University of Wisconsin-Madison.Nine"footings"of dry concrete mix were buried in each tank. <br /> Each footing was appro7cimately 30 cm(12 in.)in diameter and 14 cm(S.5 in.)thick.The nine <br /> footings in each tank were located at three different depths.Tanks were paired,and each pair <br /> subje,cted to a different water treatment. Moisture was continuously monitored in one taak of each <br /> of the three pairs using ECHO probes.Three footings(one from each depth)were removed from <br /> each tank after being in place 4 weeks.An additional three footings were removed after 12 weeks <br /> and the last three footings removed after being in place 24 weeks.Immediately after being <br /> removed,the footings were cored,and the cores were immediately capped and tested to determine <br /> their compressive strength. <br /> For compressive strength comparison purposes,the same dry concrete mix was conventionally <br /> hydrated and cast into concrete cylinders.These cylinders w�re cured according to standard <br /> pmcedures and tested 4 weeks after fabrication. <br /> Concrete Mig ProperEies <br /> One pallet(36001bm in forty-five 801bm bags)of dry concrete mix was obtained direcdy from an <br /> American Materials Corporation(AMC) facility in Eau Claire,WI(www.americanmaterials.com). <br /> To help ensure bag-to-ba�uniformity,the 1630 kg(36001bm)of dry mix provided by AMC was <br /> all bagged from the middle of the same batch mix(i.e.,production run). Sold under the trade name <br /> EZ Crete, each 36.3 kg(801bm)bag contains appmximately 5.6 kg(12.41bm)of Portland cement, <br /> 7.6 kg(16.81bm)of'/a inch aggregate,and 23.0 kg(50.81bm)of sand. <br /> Both chy and wet sieve analyses were conducted on the dry concrete mix.Dry sieve analysis was <br /> done in accordance with ASTM D422-63.For the wet sieve analysis,matcrial was washed down <br /> through the stack of sieves after dry sieving.The sieves were then dried and reweighed.Results of <br /> both wet and dry sie�ving are compiled in Table 1. <br /> Table 1. Sieve Analysis Results for Concrete Mix and Washed Sand <br /> Sieve Size Percent Passing <br /> � Concrete Mix, Concrete Mix, Washed Sand, <br /> Dry Sieve Analysis Wet Sieve Analysis Dry Sieve Analysis <br /> 4.75 mm(No.4) 77.2 77.9 99.4 <br /> 2.00 mm(No.10) 61.6 61.8 �75.8 <br /> 600 µm(No.30) 29.9 29.5 46.8 <br /> 425 µm(No.40) 22.9 23.3 �r6.0 <br /> 300µm(No. 50) 16.3 �18.0 23.5 <br /> 250µm(No. 60) 15.0 16.9 17.9 <br /> 180 µm(No. 80) 12.7 15.4 ��7.8 <br /> 150µm(No. 100) 11.4 15.2 �6.1 <br /> 106 µm(No. 140) 10.2 15.1 3.1 <br /> 75 µm(No.200) 8.4 14.9 1.8 <br /> hrip://asae.frymulti.com/request2.asp?JID=S&AII�14082&CII.�1n�L003&v=&i=&T=1 6/4/2004 <br />