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Valley R Plaza 2-CS 98030503/05/97 10:00 BMH /ASBUILTUSA /CRIS 214 -358 -1600 A S - B U I L T U S A March 5, 1997 Ken Griffin Engineering Dept. 255 Parkway Blvd. CoppelI, TX Re: Valley Ranch Plaza 817 MacArthur Blvd. Dear Ken, PAGE 2 OF 6 The city requires concrete paving to be placed over lime stabilized soil. You indicated to us that we could eliminate the lime if either the thickness is increased or the strength is increased to 4000 P.S.I. We have elected to increase the strength of the concrete to 4000 P.S.I. and eliminate the lime stabilization. "Phis exceeds the recommendation in our soils report. Enclosed with this letter is the concrete design mix that we plan on using and have approved. I f you have any further concerns, please feel free to contact us. Sincerely, =7 a L Ross Floyd BMH Architects, Inc. 3237 W. Northwest Hwy., Ste. 101 Dallas, Texas 75220 cc: John L;vans N.C. Inc. 0 A Rt�f► �.p < �J► OF �l 3sA� r * ARCHITECTURE * INTERIORS " SPACE PLANNING * ENVIRONMENTAL * 3237 W, Northwest Highway - Suite 101 - Dallas, "Texas 75220 - (2 ]4} 350 -1200 - fax (214) 358 -1600 03/05/97 10:00 BMH /ASBUILTUSA /CRIS 214 -358 -1600 Mix #: 8273 Description: 5.50SK ADMIX /AEA 1 11 CS Strength: 4000 psi Q 28 Days PAVING Maximum Coarse Aggregate: 1 - Maximum Water /Cement Ratio: 5.64 Cement /Cementitious Content: 5.50 Maximum Placement Slump: 4.00 Air Entraining Agent: ASTM Admixture: ASTM PAGE 3 OF 6 #4 CRUSHED STONE gal /sack or 0.499 lbs /lb sacks (per cubic yard) inches C -260 C -494 Type A or D MATERIAL QUANTITIES PER 1.0 CUBIC YARD AT S.S.D 517 lbs. ASTM C 150 TYPE I CEMENT 1840 lbs. 1 - ##4 CRUSHED STONE 1312 lbs. CONCRETE SAND 258 lbs. or 31.0 Gallons of Water 2.0 to 4.0 oz /cwt of ASTM C -494 Type A Specified Air Content: 3.Ot - 6.Ot Placement Slump: 3.00 + or - 1.00 inches 'f DjtLe .fir 1� 03/05/97 10:01 BMH /ASBUILTUSA /CRIS 214 -358 -1600 PAGE 4 OF 6 PUMPING RECOMMENDATIONS 1. 5 minimum diameter lines with no reduction to smaller lines. 2. Keep rubber hose to absolute minimum length and plan pipe with as few 90 degree angles as possible. 3. Samples for slump and strength tests should be taken @ discharge end of hose for strength guarantee to be valid. 4. To prime pump lines, a minimum of 8.0 sack grout should be used for lubrication. In the case of strength concrete, equivalent strength grout should be used if the grout remains in the placement. 5.' Pump mixes are based on minimum cement content pumped at ground level. As pump line increases in length or height and /or layout configuration changes, additional cement may be required to assure strength and pumpability at additional cost to the contractor. 6. TXI cannot control, and is therefore not responsible for excessive loss of entrained air content when loss occurs as a result of boom configuration or free fall discharge from hose. To ensure minimum air loss when pumping, maintain a continuous flow of concrete through the entire length of pipe and do not subject concrete to free fall. We are enclosing all available back up data for the referenced mix design (s). If the strength information is not available, or is insufficient, confirmation tests may have to be conducted by your laboratory. Cement, aggregate, and admixture certification have already been submitted. 03/05/97 10:02 BMH /ASBUILTUSA /CRIS 214 -358 -1600 PAGE 5 OF 6 Tans n=Snals C0NC8SPH DESIGN WJUVATION Date: 02/14/97 •• Statistics Compiled from Independent Laboratory Test Specimens •• Mix Bhumberc 8277 Strength: 4000 pat 0 28 Days 78 Day Test Data Temperature Test Plant (Fahrenheit) Placement Percent --- - - - - -- 28 Day -- - - - - -- Cumulative Number Date Number Ambient Concrete Slump {in) of Air PSI Moving - - -- --- -- -- 1 - PSI 2 PSI Avg Average Avg of 3 Range 1 09/10/96 18 68 80 4.00 4.54 - - -- -- 4800 - -- -- -- 4590 - - ----- 4695 4695 2 09/10/96 18 68 81 4.50 4.24 4740 4720 4730 4713 210 3 09/17/96 18 74 64 5.50 5.24 4240 4400 4320 4582 4582 20 160 4 09/17/96 18 64 63 4.50 4 -84 5020 4700 4860 4651 4637 320 5 09/17/96 18 68 80 5.50 4.54 4480 4540 4510 4623 4563 60 6 09/17/96 18 67 80 5.50 5.04 4760 4560 4660 4629 7 09/23/96 31 73 83 4.75 4.94 4540 4340 4440 4602 4677 200 8 09/23/96 31 74 83 5.00 4.74 4537 200 4470 4360 4415 4579 4505 110 9 09/23/96 31 75 84 5.00 4.84 4400 4320 4360 4554 4405 80 10 09/23/96 31 75 84 4.75 4.84 4340 4220 4280 4527 4352 120 11 09/25/96 41 69 83 5.00 5.34 4760 4630 4695 4542 4445 130 12 09/25/96 41 71 84 5.00 5.24 4830 4580 4705 4556 4560 250 13 09/27/96 41 55 74 4.75 5.04 4670 4540 4605 4560 4668 130 14 09/27/96 41 57 73 5.00 4.94 4600 4730 4665 4567 4658 130 15 10/24/96 31 71 5.50 5.64 4040 4060 4050 4533 4440 20 16 10/24/96 31 74 5.50 5.54 4190 4060 4125 4507 4280 130 17 10/24/96 31 72 5.00 5.94 4300 4290 4295 4495 4157 10 18 10/31/96 31 64 77 4.50 3.14 4820 4910 4865 4515 4428 90 19 10/31/96 31 63 77 5.00 3.24 5080 5120 5100 4546 4753 40 20 10/31/96 18 60 75 5.00 4.34 5090 4980 5035 4571 5000 110 21 10/31/96 18 63 74 5.25 3.14 5120 5150 5135 4597 5090 30 22 10/31/96 18 62 73 4 -50 4.04 4750 4800 4775 4605 4982 50 23 10/31/96 18 61 74 6.00 3.7% 4490 4410 4450 4599 4787 80 24 10/31/96 18 62 71 4.50 4.5% 5010 5070 5040 4617 4755 60 25 11/01/96 31 73 5.00 4.6t 4670 4590 4630 4618 4707 80 26 11/12/96 18 76 73 4.75 5.3V 4480 4250 4365 4608 46'8 230 27 11/13/96 31 78 75 4.00 N/A 4710 4S40 4625 4609 4540 170 28 11/13/96 18 66 64 5.00 2.54 4260 4120 4190 4594 4393 140 29 11/13/96 18 66 S9 4.75 2.84 4640 43SO 4495 4590 4437 290 30 11/22/96 18 61 - - ---- 13 ---- -- 4.50 --- ------ 4.54 --- 4680 4520 4600 4591 4428 160 '"' Averages '•• 67 76 4.92 --- 4.5% 03/05/97 10:03 BMH /ASBUILTUSA /CRIS 214 -358 -1600 PAGE 6 OF 6 COMMENTARY OF STATISTICAL EVALUATION OF CONCRETE DESIGN RESULTS Mix Nun: 8273 Strength: 4000 psi 0 28 Days Paragraph 5.5 of ACI 318 -89 provides that as data becomes available during construction, the amount by which (F'cr) must exceed the specified value of (F'c) may be reduced, provided: (a) 30 or more test results are available and average of test results exceeds that required by Section 5.3.2.1, using a standard deviation calculated in accordance with Section 5.3.1.1, or (b) 15 to 29 test results are available and average of test results exceeds that required by Section 5.3.2.1, using a standard deviation calculated in accordance with Section 5.3.1.2. The required average compressive strength has been calculated using a standard deviation calculated in accordance with ACI 318 -89 Section 5.3.1.1 or Section 5.3.1.2 and is the larger value of these calculations: F'cr = F' c + 1. 34 (SD) 4000 + 1.34( 283.1) 4379 F'cr = F'c + 2.33(SD) - 500 = 4000 + 2.33( 283.1) - 500 = 4160 SUMMARY OF STATISTICAL ANALYSIS 28 Day Test Data Number of Tests .......................... 30 Maximum Value ............................ 5135 psi Minimum Value ............................ 4050 psi Range ..... ............................... 1085 psi Average Strength ......................... 4591 psi Standard Deviation ....................... 283 psi Required Average Strength to satisfy minimum probability conditions of ACI 318 -89 Section 5.3.2.1 ............... 4379 psi Design excess beyond code requirements... 212 psi