Valley R Plaza 2-LR 970305 03/05/97 10: 00 BMH/ASBUILTUSA/CRIS 214-358-1600 PAGE 2 OF 6
I 1 'It T
A S - B U I L T U S A
March 5, 1997
Ken Griffin
Engineering Dept.
255 Parkway Blvd.
Coppell, TX
\11
Re: Valley Ranch Plaza
817 MacArthur Blvd.
Dear Ken,
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. This exceeds the recommendation in our soils
report. Enclosed with this letter is the concrete design mix that we plan on using and
have approved.
If you have any further concerns, please feel free to contact us.
Sincerely,
to
ARC‘%
Ross Floyd ;.4) •09 °4 /004
BMH Architects, Inc. ;w cf , ��, op n1,;
3237 W. Northwest Hwy., Ste. 101 ; °c ^." .4
Dallas, Texas 75220 h
3444 r
cc: John Evans �k rF OF
N.C. Inc,
* ARCHITECTURE * INTERIORS R SPACE PLANNING k ENVIRONMENTAL *
3237 W. Northwest Highway - Suite 101 - Dallas, Texas 75220 -(214) 350-1200 - fax (214) 358-1600
03/05/97 10 : 00 BMA/ASBUILTUSA/CRIS 214-358-1600 PAGE 3 OF 6
Mix # : 8273
Description: 5 . 50SK ADMIX/AEA 1"CS
Strength: 4000 psi @ 28 Days
PAVING
Maximum Coarse Aggregate : 1" - #4 CRUSHED STONE
Maximum Water/Cement Ratio: 5 . 64 gal/sack or 0 . 499 lbs/lb
Cement/Cementitious Content : 5 . 50 sacks (per cubic yard)
Maximum Placement Slump : 4 .00 inches
Air Entraining Agent : ASTM C-260
Admixture : ASTM 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 . 096 - 6 . 0%
Placement Slump: 3 .00 + or - 1 . 00 inches
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Du e : 2 1,.i -97 L:;; _4..
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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
TEXAS INDUSTRIES
CONCRETE DESIGTN EVALUATION
Date: 02/14/97 ** Statistics Compiled Trom Independent Laboratory Test Specimens **
Mix Number: 8273 Strength: 4000 psi • 28 Day.
28 Day Teat Data
Temperature
Test Plant (Fahrenheit) Placement Percent
28 Day Cumulative Moving
Number Date Number Ambient Concrete Slump(in) of Air PSI 1 PSI 2 PSI Avg Average Avg of 3 Range
1 09/10/96 18 68 80 4.00 4.5% 4800 4590 4695 4655
2 09/10/96 18 68 81 210
4.50 4.24 4740 4720 4730 4713 20
3 09/17/96 18 74 84 5.50 5.2% 4240 4400 4320 4582 4582 160
4 09/17/96 18 64 B3 4.50 4.8% 5020 4700 4860 4651 4637 320
5 09/17/96 18 68 80 5.50 4.5% 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 4537 200
4.75 9.94 4540 4340 4440 4602 4537 200
8 09/23/96 31 74 83 5.00 4.7% 4470 4360 4415 4579 4505 1.0
9 09/23/96 31 75 84 5.00 4.8% 4400 4320 4360 4554 4405 80
10 09/23/96 31 75 84 4.75 4.8% 4340 4220 4280 4527
11 09/25/96 41 69 83 4352 122
5.00 5.3% 4760 4630 4695 4542 4445 130
12 09/25/96 41 71 84 5.00 5.2% 4830 4580 4705 4556 4560 250
13 09/27/96 41 55 74 4.75 5.0% 4670 4540 4605 4560 4668 130
14 09/27/96 41 57 73 5.00 4.9% 4600 4730 4665 4567 4658 130
15 10/24/96 31 71 5.50 5.6% 4040 4060 4050 4533 4440 20
16 10/24/96 31 74 5.50 5.5% 4190 4060 4125 4507 4280 130
17 10/24/96 31 72 5.00 5.9% 4300 4290 4295 4495 4157 10
18 10/31/96 31 64 77 4.50 3.1% 4820 4910 4865 4515 4428 90
19 10/31/96 31 63 77 5.00 3.2% 5080 5120 5100 4546 4753 40
20 10/31/96 18 60 75 5.00 4.3% 5090 4980 5035 4571
21 10/31/96 18 63 74 5000 110
5.25 3.1% 5120 5150 5135 4597 5090 30
22 10/31/96 18 62 73 4.50 4.0% 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 4.8% 4670 4590 4630 4618
4707 80
26 11/12/96 18 76 73 4.75 5.3% 4480 4250 4365 4608 4678 230
27 11/13/96 31 78 75 4.00 N/A 4710 4540 4625 4609 4540 170
28 11/13/96 18 66 64 5.00 2.5% 4260 4120 4190 4594 4393 140
29 11/13/96 18 66 59 4.75 2.8% 4640 4350 4495 4590 4437 290
30 11/22/96 18 61 73 4,50 4.5% 4680 4520 4600 4591 4428 160
*" Averages ... 67 76 4.92 4.58
03/05/97 10: 03 BMH/ASBUILTUSA/CRIS 214-358-1600 PAGE 6 OF 6
COMMENTARY OF STATISTICAL EVALUATION OF CONCRETE DESIGN RESULTS
Mix Num: 8273 Strength: 4000 psi @ 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 requirements212 psi