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BURNCO Colorado, LLC <br /> BURMCD 301 Centennial Drive <br /> Milliken, CO 80543 <br /> Mix : 45C2N1 C4C <br /> Period : 01/07/2020 to 04/01/2020 <br /> Specified Strength 4500 Strength Type Compressive Test 28 Day <br /> Number of Tests 30 Over Design Type ACI 318>=30 Tests Within Test CofV Factor 1.147 <br /> Average Strength 5750 SD Correction Factor 1.000 Within Test SD 370 <br /> Standard Deviation 280 Corrected SD 280 Within Test CofV 6A3 <br /> Degree of Control EXCELLENT Corrected CofV 4.9 Batch-to-Batch SD <br /> Coefficient of Variation 4.9 Pc+1.34's 4880 Batch-to-Batch CofV <br /> Maximum Pc for Mix 5370 Vc+2.33*s-500 4650 Cem entitious Content 664 <br /> Safety Factor 870 Required Strength 4880 Cementitious Efficiency 8.7 <br /> Air Content Slump Concrete 3D Str 7D Str 28D Str <br /> % in deg F psi psi psi <br /> Count 30 30 29 28 29 30 <br /> Average 6.38 4.73 65 3680 4660 5750 <br /> ST DEV 0.78 0.64 3 550 400 280 <br /> COV% 12.2 13.6 4.8 14.9 8.6 4.8 <br /> Range Min 4.90 3.50 59 2220 3890 5060 <br /> Range Max 7.40 5.50 75 4780 5500 6150 <br /> Concrete <br /> Date Sam pie Air Content Slump Temp3D Str 7D Str 28D Str <br /> p % in deg F psi psi psi <br /> 716842 7.40 5.00 68 3460 4220 5710 <br /> 04/01/2020 <br /> 65116 5.00 5.50 1 63 3430 4320 5580 <br /> 03/18/2020 65088 6.00 5.50 65 3870 4130 5450 <br /> 03/16✓2020 40551 7.30 5.00 68 4010 4160 5340 <br /> 03/12/2020 716828 6.20 5.50 64 3730 4600 5930 <br /> 03/11/2020 22579 5.20 4.50 69 4780 5390 5370 <br /> 03/05/2020 65056 6.00 4.00 63 3320 4160 5410 <br /> 03/03/2020 910595 7.00 4.00 63 2930 3890 5840 <br /> 02/27/2020 50629 5.50 4.75 62 3430 4800 6050 <br /> 32748 6.10 5.50 62 4260 5500 5960 <br /> 02/24/2020 910589 7.40 4.50 62 3330 4420 5530 <br /> 02/22/2020 910588 7.00 5.50 63 3000 5030 5790 <br /> 02/19/2020 65017 5.70 5.50 75 3830 4380 5450 <br /> 50621 6.80 4.00 4070 5210 6010 <br /> 02/17/2020 <br /> 50620 5.80 4.00 59 4460 4980 5690 <br /> 02/14/2020 83055 7.00 5.50 63 2220 4530 5960 <br /> 01/30/2020 40526 7.10 4.50 62 4130 4760 5950 <br /> 01/29/2020 50612 5.20 5.00 68 3560 4360 5060 <br /> 01/28/2020 50605 4.90 4.25 64 3850 4830 5560 <br /> 22559 5.90 5.00 66 4140 4900 5930 <br /> 01/27/2020 40522 5.90 3.50 66 4090 5200 6120 <br /> 716792 6.50 4.00 61 3170 4770 5760 <br /> 01/252020 64974 7.00 5.00 65 4020 4630 5670 <br /> 01/21/2020 716785 1 7.10 4.50 64 3910 1 4820 5940 <br /> Date: 6/11/2020 Page 1 of 2 <br />