CEMENT--RETARDED SETS. 522 Bonneville Improved Natural Cement. RETARDED SET SERIES, GROUTS. I Original quantities: Cement, 70.5 pounds; water, 43.5 pounds = 61.7 per cent. Mixed and allowed to remain over night, 16 hours, in the mixing bed. Five pounds surplus water removed in the morning, leaving 38.5 pounds = 54.6 per cent in the mixture. Worked over and put into molds. Lumpy at the time. Age when tested, 31 days. Num- ber. Dimensions. Sectional area. First crack. Compressive strength. Remarks. Height. Compressed surface. Total. Per square inch. Inches. Inches. Inches. So. inches. Pounds. Pounds. Pounds. 1 5.93 6.02 5.86 35.28 7,920 7.920 224 2 5.95 5.98 5.85 34.99 7,520 520־! 7 215 3 6.02 6.15 5.56 34.20 6,340 6,340 185 4 6.00 6.11 5.64 34.47 5,780 5,780 168 5 5.96 6.02 5.88 35.40 6,500 6,790 192 6 6.03 6.00 5.83 34. 99 6,510 6,510 186 7 6.00 6.05 5.82 35.21 7,160 7,160 203 8 6.01 6.01 5.92 35.58 6,950 6,950 195 3.99 3.99 3.82 15.24 3,220 3,220 211 1 1.93 1.99 1.98 3.94 570 965 245 2 1.98 1.91 1.97 3.77 650 1,010 268 3 ].91 2.00 1.99 3.98 1,050 1,050 264 Hoffman Natural Cement. RETARDED SET SERIES, GROUTS. Original quantities: Cement, 74 pounds; water, 47.5 pounds=64.2 per cent. Mixed and allowed to remain over night, 16 hours, in the mixing bed. Worked over in the morning and put into molds. No water needed. Age when tested, 31 days. Num- ber. r Height. intensions. Compressed surface. Sectional area. First crack. Compressive strength. Remarks. Total. Per square inch. Inches. Inches. Inches. Sq. inches. Pounds. Pounds. Pounds. 1 5.90 5.98 5.78 34.57 8,900 8,900 257 2 5.93 5.93 5.81 34.45 9,590 9,590 278 3 5.97 5.88 5.77 33.92 8,720 9,820 290 4 5.98 5.92 5.86 34.69 9,450 9,780 282 5 5.93 5.96 5.84 34.80 9,730 9,730 280 6 5.95 5.92 5.88 35.10 9,670 9,670 275 7 5.90 5.94 5.80 34.45 9,020 9,020 262 8 6.01 5.96 5.77 34.39 8,900 8,900 259 3.97 3.97 3.85 15.29 4,280 4,280 280 1 1.99 1.91 1.97 3.77 980 1,145 304 2 1.90 1.98 1.98 3.92 450 1,030 263 3 1.90 1.98 1.98 3.92 1,420 1,420 362