Fountain Park 1-LR 931028October 28, 1993
TEXAS INDUSTRIES, INC.
7610 STEMMONS FREEWAY · DALLAS, TEXAS 75247 · (214)647-6700
Austin Bridge & Road
11143 Goodnight Lane
Dallas, Tx 75229
Attention Mr. Mike Ducote'
RE: Fountain Park
8274
Gentlemen:
The attached concrete mix design utilizing the appropriate ASTM C-33 or
ASTM C-330 aggregate is proposed for use on the above referenced project
for ready mix concrete to be furnished by TXI.
To ensure that the correct mix is delivered to your project, please
order by the mix design number which appears in the upper left hand
corner of the mix design.
Texas Industries certifies that the above mix design, when ordered by
specified design identity, will meet or exceed the ~ndicated design
strength at a designated age when tested in accordance with the
applicable and current ASTM Standards C 31, C 39, C 78, C 172, C 293,
applicable provisions of C 94, and evaluated in accordance with
applicable provisions of the ACI 318 Building Code.
TXI would like to be included on your mailing list to receive all test
reports. ASTM C 94-86a Section 14.4 entitles a manufacturer to receive
copies of all test reports when strength of concrete is used as a basis
for acceptance.
Contact us if you have any questions or require any additional
information. Please notify TXI of approval of the proposed mix design
prior to its use. To ensure that the proper mix design is ordered,
please send a copy of this letter, after approval, to the above
referenced project to be used by the person ordering the concrete for
this job.
Sincerely,
TEXAS INDUSTRIES, INC.
Dana L. Link
Customer Service Representative
MIX # 8274
6.00SK ADMIX/AEA 1"CS
4000 PSI @ 28 Days
AS REQUIRED
Maximum Coarse Aggregate Size: ASTM C 33 1''- #4 Crushed Stone
Maximum Water/Cement Ratio: 5.33 gal/sk .472 lb/lb
Minimum Cement Content per Cubic Yard: 6.00 sacks
Maximum Placement Slump: 5.0 inches
Admixture ASTM C-494: Type A or D
Air Entraining Agent ASTM C-260: 3% - 6%
MATERIAL QUANTITIES PER i CUBIC YARD AT S.S.D.
564 lbs. or 6.00 sacks ASTM C 150 Type I Cement
1840 lbs. ASTM C 33 1"- #4 Crushed Stone
1273 lbs. ASTM C 33 Concrete Sand 267 lbs. or 32.0 gallons of Water
2.0 to 4.0 oz/cwt of ASTM C-494 Type A
Specified Air Content: 3% - 6%
Placement Slump: 4.0 + or - i inches
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 go degree angles as possible.
3. Slumps and test cylinders 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.
We are enclosing all available back up data for the above referenced mix
design. If the strength information is not available or is not
sufficient, conformation cylinders may have to be made by your testing
laboratory.
Date: 10/28/93
TEXAS INDUSTRIES, INC.
CONCRETE DESIGN EVALUATION
Statistics Compiled From Independent Laboratory Test Specimens **
Mix No. K8274
Strength 4000 psi ~ 28 Days
28 Day Test Data
Page: I
Test Plant
No. Date No.
1 02/24/93 47
2 02/26/93 47
3 03/08/93 31
4 03/16/93 31
5 03/25/93 31
6 03/26/93 31
7 03/29/93 31
8 03/30/93 31
9 03/31/93 31
10 04/01/93 31
11 04/02/93 31
12 04/05/93 31
13 04/21/93 31
14 04/21/93 31
15 04/26/93 18
16 04/27/93 18
17 04/28/93 18
18 07/23/93 32
19 07/26/93 32
20 07/26/93 32
*** Averages
Temperature Placement Percent
Amb Con Slump of Air
....... 28 Day ....... Cum Moving
PSI 1 PSI 2 PSI Avg Avg Avg of 3 Range
66 72 4.6 4.3
N/A 65 5.2 4.2 5390 5590 5490 5490 5490 200
N/A 63 4.2 3.8 5090 5040 5065 5278 5278 50
62 70 5.5 3.6 4760 4660 4710 5088 5088 100
59 62 5.0 4.0 4570 4460 4515 4945 4763 110
77 70 5.7 N/A 5300 5890 5595 5075 4940 590
75 7D 5.0 N/A 6010 5940 5975 5225 5362 70
75 70 5.5 N/A 4740 4920 4830 5169 5467 180
70 75 7.0 N/A 5450 5660 5555 5217 5453 21D
65 65 6.0 N/A 5730 5840 5785 5280 5390 110
60 65 4.5 N/A 4410 4820 4615 5214 5318 410
58 69 3.5 N/A 5040 4810 4925 5187 5108 230
60 65 4.5 N/A 5620 5760 5690 5229 5077 140
45 60 4.5 4.0 5230 4850 5040 5215 5218 380
48 62 5.5 4.0 4950 4880 4915 5193 5215 70
81 80 3.0 N/A 4560 4390 4475 5145 4810 170
80 85 3.0 4.8 4970 4700 4835 5126 4742 270
74 75 3.0 N/A 4650 4520 4585 5094 4632 130
N/A 89 2.2 5.0 5450 5240 5345 5108 4922 210
N/A 89 3.5 4.5 4790 5090 4940 5099 4957 300
N/A 94 4.7 4.8 4410 4640 4525 5071 4937 230
COMMENTARY OF STATISTICAL EVALUATION OF CONCRETE DESIGN RESULTS
Mix No. K8274
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' = f' + 1.34(SD)
cr c
= 4000 + 1.34(00507)
: 4679
f' : f' + 2.33(SD) - 500
cr c
4000 + 2.33(00507) - 500
4681
The standard deviation has been modified according to ACI 318 Table 5.3.1.2
SUMMARY OF STATISTICAL ANALYSIS
28 Day Test Data
Number of Tests .......................... 20
Maximum Value ............................ 5975 psi
Minimum Value ............................ 4475 psi
Range .................................... 1500 psi
Average Strength ......................... 5071 psi
Standard Deviation ....................... 507 psi
Required Average Strength to satisfy
minimum probability conditions of
ACI 318-89 Section 5.3.2.1 ............... 4681 psi
Design excess beyond code requirements.. 390 psi