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7-i4-04; 17:40 ;Lester Bulldinp ;3203955376 � i3/ 28 <br /> Article Request Page Page 11 of 26 <br /> 0.85 19.2 <br /> Tank 6 (Treatment C) <br /> � 0.30 16.4 <br /> � � <br /> � 0.25 13.7 � <br /> � � <br /> a <br /> v 0.20 10.9 � <br /> � c <br /> � <br /> 0 0.15 8,2 � <br /> � U <br /> u �,t <br /> � 0.10 5.5 � <br /> � . • 49 an depth � <br /> j • —36 an depth � � <br /> 0.05 � —21 cm depth . . . 2.7 <br /> . , -- i7cm depth�.. <br /> 0.00 .. 0 <br /> 0 4 6 12 16 20 24 <br /> Time,weeks <br /> Figure 10.Volumetric moisture content of sand in tank 6.Points shown for 49 cm depth represent <br /> values recorded just prior to surface water being applied on those days.Dry bulk density of sand <br /> asaumed equal to 1826 kg/m3.Tanks 5 and 6 were subjected to water trea�nent C. <br /> Normally-Hydrated Specimen Preparation and Testfng <br /> As a control,water was added to the dry concrete mix obtained for this study and the wet mix <br /> blended to a uniform consistency before placement into 76-by 152-mm(3.0-by 6.0-inch)test <br /> cylinder molds.The resulting cylinders were cured and then capped and tested to failure at 28 days <br /> in accordance with ASTM C192/Ci92M-00. <br /> A total of 49 cylinders were cast: seven cylinders each at seven different water/ccment(WG7 ratios. <br /> Of the seven cylinders at each WC ratio,three were rodded with a 9.5 mm(3/8-inch)diameter md <br /> and two were vibrated on a Syntron vibrating table(Humboldt Manufacturing Company)in <br /> accordance with ASTM C 192/C 192M-00.The remaining two were rodded with a 15.9 mm(5/8- <br /> inch)diameter rod which is not in accordance with ASTM C192/C192M-00. <br /> Concrete Bulk Density <br /> Folluwing compressive tests,norrnally and in-situ hydrated concrete samples were allowed to air- <br /> dry for two months.Lazge pieces of these broken samples were randomly selected for bulk density <br /> determinations.These pieces were weighed,dipped in beeswax(speciSc gravity 09�,reweighed <br /> with the beeswax coating,and then weighed while submerged in water. <br /> Results <br /> In-Situ Hydrated Concrete <br /> Appendix A contains the compressive strengtha for all cores that could be properly tested. Core <br /> height to diameter(H/D)ratios ranged between 1.99 and 2.50.To account for the slight affect that <br /> http://asae.fiymulti.com/request2.asp?JID=S&AID=14082&CII�1nW1003&v=&i=&T=1 6/4/2004 <br />