Park West CC(7)-LR 980810 I J
·
1341 West Mock[ngblcd Lane · Dallas, Texas 7S247 · 972.647.6700 · wwW. t'Xi.com
Au~st ~0, 1998
McFadden & Miller, Inc.
P..O. Box 59882
Dallas, TX 75229
Attn: Mr. Jon Jacobson
RE: Parkwest 1 & 2
Wrangler & Enterprise - Coppell
0045 0046 0047 9643
IHE ACTION NOTED BELOW DOES NOl
RELIEVE THE CONTRACTOR OR STEEL
SUPPLIER oF ANY RESPONSIBILITY
FOR DISCREPANCIES BETWEEN THE
SHOP DRAWINGS & THE AUTHORIZED
CONTRACT DOCUMENTS.
[] NO EXCEPTIONS TAKEN
EXCEPTIONS AS NOTED
[] RESUBMIT
TECHNISTRUCTURES
ST.UCTU A, ENG,NE R
The attached concrete mix designs utilizing the appropriate ASTM
C-33 or ASTM C-330 aggre'gate are proposed for use on the above
referenced project for ready-mixed 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 ~n the upper
left hand corner of the mix design.
Texas Industries Certifies that the above mix designs, when
ordered by specified design identity, and delivered by ~XI, will
meet or. exceed the indicated de?~n strengt~ at the deszgnat~d
age when tested in accordance wlth the applzcable and current
ASTM Standards C 3~,. C 39, C 78, C.172, c 293, ap?licable.
provisions of C 94, and evaluated zn accordance wzth applzcable
provisions of ACI Building Code.
TXI would like to be included ono r mailing list to receive all
test reports. ASTM C 94 entitlesYaUmanufacturer to receive
copies of all test reports when strength of concrete is used as a
basis for acceptance.
Please contact us if you have any quemtlons or require any
additional information. Please notify TXI of approval of the
proposed mix designs prior to their use. Failure to notify us
prior to first placemen~ shall constitute acceptance~ To ensure'
that the p~oper mix designs are 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
Michael A. Caldarone, P.E.
Manager - Q.A. / Q.C.
Mix ~: 0045
Description: 4.50SK ADMIX
Strength: 3000 psi @ 28 Days
PIERS
1 "CS
Maximum Coarse Aggregate' 1" - ~4 CRUS~rED STONE
Maximum Water,/Cem~nt--Ratio: 7.11 ~al/sack or O. 63'1 lbs/lb
Cement/Cementltious Content.' 4.50 sacks (per cubic yard)
Maximum Placm. m~.,nt Slump; S. 00 inches
Admixture: ASTM C-494 Type A or D
MATERIAL QU/LNTITIES PER 1,0 CUBIC YARD AT S,S.D
423 lbs. ASTM C i$0 TYPE I CEMENT
1840. lbs. 1" - #4 CRUSHED STONE
1501 lb~. CONCRETE ~ARD
267 lbs. or 32.0 Gallons of Water
2.0 to 4.0 oz/cwt of ASTM C-4~4 Type D
Placement Slump: 4.00 + or - 1.00 inches
Mix ~: 0046
Description: 5.00SKADMIX
Strength: 3500 psi @ 28 Days
1" CS
TOPPING SL~B, TILT WALL PANELS
Maximum Coarse Aggregate: 1" - %4 CRUSHED STONE
Maximum Watar~Ccment Ratio; 6.40 ~al/~duk or 0.§68 lbs/lb
Cement/Cementltious Content: S.00 sacks (per cubic yard)
Ma×{~lm Placement Slump: 5.00 inches
Admixture: ASTM C-494 Type.A or D
MATERIAL QU.~NTITIES PER 1.0 CUBIC YARD AT $.S.D
470 lbs. ASTM C 150 TYPE I CEMENT
1840 .lbs. 1" - #4 CRUSHED STONE
1462 lbs. UON~'I'E SAND
267 lbs. or 32,0 Gallons of water
2.0 to 4.0 uz/uwL of O2~rTM C-494,Type D
Placement SlUmp: 4.00 + - 1.00 inches
Mix ~: 0047
Description: 5.50SK ADMIX
Strength: 4000 psi ~ 28 Days
1"CS
SLAB - ON- GRADE
Maximum Coarse Aggregate: 1" - #4 CRUSHED STONE~.
Maximum Water/Cement Ratlo~ ~.S2 gal/sack or U.516 lbs/lb
Cement/Cementitious Content: 5.50 sacks (per cubic yard)
Maximum Placement Slump: 5.00 inches
Admixture: ASTM C-494 Type A or D
MATRRIAL QUANTITIES PER 1.0 CUBIC YARD AT S.$.D
b17 IDs. ASTM C 150 TYPE I CEMENT
1840 lbs. 1" - 94 CRUSHED STONE
1422 lbs. CONCRET~ SAND
267 lb~. or 32.0 Gallons of Water
2.0 to 4.0 oz/cwt ~£ A=~TM C-~94 ~pe D
Placement Slump: 4.00 + or - 1.00 inches
Mix #: 9643
Description: 5.50SK TYPE A ADMIX/AEA i"CS
Strength: 4000 psi ~ 28 Days
Maximum Coarse Aggregate: 1" - $4 CRUSHED STONE.
Msximum Water/Cemant Ratio: 5.82 9al/~ack or 0.516 lbs/lb
Cement/Cementi=ious Content: 5.50 sacks (pst cubic yard)
M~w~mum placement slump: 4.00 inchc~
Air Entraining Agent: ASTM C~260
Admixture: ASTM C-494 Type k or D
MATERIAL QUAntITIES PER 1.0 CUBIC YARD AT S.S.D
517 lbs. ASTM C 150 TYPE I CEME~F~
1840 lbs. 1" - ~4 CRUSHED STONE
1288 lbs. CONCRETE SAND
267 lbs. oz' 32.0 Gallons of Wa~er
2.0 to 4.0 oz/cwt of ASTM C-494 Type A
Dpecifie~ Air Contcnt: 3.0% - 6.0%
Placement Slump: 3.00 + or - 1.00 inches
PUMPING ~'OTF.$ / R~UOMMENDATIONS
3.
4.
5" minimum dia,uu~=r lines with no reduction to smaller
lines, ii
K~ep rubber hosc to absolute minlmu(~ length and plan pipe
with as few 90 degree angles as possible.
SamDles ~ ~lump and ~tren~th toots ~hou!d be take~ ~
discharge end of .hose for strength 'guarantee to be valid.
To prime Dump lln~s, a minimum of 8.0 sack Stout chould b~
used for lubrication. In the case of strength concrete,
equivalent strength grout should be used if th~ grout
remains in the placement.
Pump mixes are based on minimum cement content pumped at
ground level. AS pump line increases in length or height
and/or layout confi~uratlon changes, addz~onal cement may
be requircd ~o assure sti'~n~'~h and pumpability at additional
cost to the contractor.
T~I cannot control, and is tharcfor~ not ~=~ponslble for
excessive loss of entrained air content when loss occurs as
a result of boom co~f~lration or fr~e fall discharge.from
hose. To ensure minimum air loss when pumping, maintain a
continuous flow of concrete through th, entire length of
pipe and do not shtbject concrete to free fall.
W~ are enclosing all available back up d~ta' ~or the referenced
mix.design(s). If the Strength inform~t~'6n i~ not avai~=~12 ~w
is zn~ufficlent, coz~£irmation tesus may have to be con~~ '~
your laboratory.
Cement, aggregate, and admixture certification have already been
submitted.
Unles.s otherwise indicated, when the concrete temperature at
point of placement exceeds 90 degrees, TXI will guarantee
s[ren$~h perIormance of the mix design(s) herein submitted up to
a maxlmum placement temperature of 100 degrees usinc an ASTM C
494 Typu D retarding water-reducer as.lon~ as the c~ncrete is
placed within 75 minutes from batch t~me.
JLix }lumber~ 004,S IIt,~-en~e.bt 't000 ~i( · 21
Da~= Numl~
i o~/0~/~8
3 0~/~3/99
0;/27/~8
s 03/c~/9~ 16
6 o3/03/~o
? o~/~/9~
s 03/26/o8
9
lo
o4/oz/~o
12 o¢/oe/98
1¢ o4/2~/9~
15 o4/1]/95
X~ o¢/1]/98 i8
x7 04/~4/~8
la
xO 04/:5/90
20 04/25/~6
2!
aZ
~3 o4/20/9;
o(
2S 04/23/98
26 05/09/9;
2? 05/12/9i
2~ 0S/13/98 44
29 0S/13/98 44
30 0S/13/95 44
*** Average9
Temperature
( r"a~;enJ*ml~; Placement Pe~cen~ ......... 28 Day
~l~c ~ncreCe S!~(ln) of Air P8~ I PS~ 2
55 6~ 4.50 N/A 4010 ~050
4R 94 ;.~S ~/A 4~ag 4040
4~ 58 B. 00 N/A 4;40 4290
6~ 4,00 N/x 3g~C ~SSO
4~ 70 S,S0 N/A 37~0 3790
44 70 5.50 N/A 3760 3700
70 ?l 5.50 ~/A 3?90
60 ~ S.O0 ~/X 43~0
96 79 5.00 N/A 3710 3630
76 79 5.00 ~A 4100 1~60
42 7~ ~.~0 ~/A 3760 3780
74 ~ 4.50 ~/A 3~2o ~66o
99 7S G. o0 N/A J~UU J~UU
7~ 6 ,S0 ~/A 3330 3170
67 5.50 N/A 3200
eo 81 5.00 N/A 3320 3470,
74 76 S ,00 N/A 3870 362P
81 84 ; ,00 N/A 3430 · 32~0
~9 64 4.50 N/A 4120 4090
b7 7~ ~.2S N/A 4490 4700
;9 77 7.00 N/A 3900 39~0
~3 7~ 7.00 N/A ~63o ;18o
81 4.S0 N/A 3~10 3760
76 80 5.50 N/~ ~ n
&? 72 5,2S ~/A 36S0 3770
73 78 S ,50 N/A 3490 3620
68 74 S. 18
Oamula:i~
PSi Avcj ([ Aveca~e
4030 &030
~u~b 4063
4415 4180
~0~0
3980 4030
~T~ 3980
3930 3944
~275 3956
3;70 3951
4330 3989
3770 3969
3640
3G50 3934
3250 3885
3750 )876
3545 3~56
3395 3817
3q45 3~13
3355
41oo 350S
4590 38~2
392O 3~44
4385 3867
~655 3866
3910 3139
3555 3630
AW of ) Range
~0
~0
4180 250
· liJ 40
4008 20
3900 GO
3747 ~2D
3~13 qn
~892 80
4092 460'
3923 20
3~13 80
3753 100
358O 160
35~5 gg0
3S30 1~0
35~0
34~8
3933 40
40LS 220
4203 40
42~8 10
4053 650
~Y33 120
3717 $0
3~? 1~0
3707 120
3;4?
CQ~MENTARY ~F STATIETICAL EVALUATION OF CONC~TE DESIreR ~LT~
Mix Num.- 0045
Strength, 3000 pg~. ~ 2g Days
Paragraph b.b of ACI 318-89 provides that as data becomes
available durin~ uu~sCruc~lon, ~he a~ount Dy which (F'cr) must
exceed the speclficd value of (F'c) ,,,aY be reduCed,~iprovided:
fa) 30 ~ more te~t resul=s are ~vailable and avu~'=9~ of
test results exceeds that required by Section 5.3.2.1,
using a standard deviation caloulated 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.%, using
~ ~tandard deviasion calculated in accordance w~th
Section 5.3.1.2.
Th? required average compressive strength has been calculated
q~ng a ~tandard deviatzon calculated in accoz'dance wish
ACI 318-89 Section 5.3.1.1 or Section S.3.1.2 and is the lar~er
value of these calculations:
F'cr = F'c
3000
343~
F'cr = F'c
3000
= 3255
+ 1.34 (SD)
+ 1.34( 323.9)
+ 2.33 (SD) - 500
+ 2.33 ( 323.9) - 500
SUMMARY OF STATISTICAL ANALYSIS
28 Day Test Data
Number of Tests .......................... 30
Maximum Value ............................ ~590 psi
Minimum Value ............................ 3250 psi
Range& ................................... 1340 psi
Average Strengt~ ........................ . 3830 psi
Standard Dmv{~tlon ....................... 32~ poi
Requi'ged Average Strength to satisfy
minimum Drobability conditions of
ACI 318-89 Section 5.3.2.1 ............... 3434 psi
Desiq~ excess beyond code requirements... 396 psi
5t~'am:j't.h~ 3500 pm:L
Nu~,*~er* D~Ce .Numbe~ A~bteflt Conole~.e
2 os/~4/~e so 7~ ~ s.oo
) 05/14/90 50 75 O~ 8.OO ~/A
~ 06/01/9~ 42 ~4 9~ 5,00 ~/A
6 oG/o3/90 9~ s.~s
/ 06/03/98 42 82 8~ 5.0C
8 o(/04/90 9o ~.~ ~/A
2o 06/05/98 02 5.so ~/A
22 06/08/98 ~3 ?o 74 5.0o ~/A
13 06/0g/98 ¢3 e~ ~ s.oo ~/A
~4 06/08/98 ~o 89 8~ 4,oo ~/A
2S 06/09/98 91 ;.~n
l& 06/09/9i 4~ 93 94 3.00
27 o;/~o/98 86 5,ec
18 06/12/90 ~; ;.~0
29 0;/15/98 85 5.~ ~/A
~0 Ub/l~/~ 43 95 90 · S.00 N/A
21 06/22/9~ 43 97 84 5.00 N/A
~ o6/22/9~ ~ ~00 91 ~.00
23 06/23/98 43 9~ 95 6,OC N/A
2~ 06/24/9~ 43 79 78 5.00 N/A
2~ 06/24/96 4~ 78 77 ~.OO
as 06/24/98 ~3 78 7e 5.00 N/A
29 06/24/98 43 70 ~t 5.00
Place~t. nt Percent ......... 26 Day ........ Cu~mulattve ,"',loving
5020 4980 5000 5000 40
~60 3700 3630 CJib 140
35;0 3660 3610 4080 40~0 100
47~ 5o9o S01O ~313 40~
3960 38~0 3920 4234 4180 ao
4520 4680 4600 ~9~ 4GXO :CO
3500 36~0 3745 4218 408B 110
5360 5220 5290 4351 4545
4350 %560 4455 436~ 449? 210
4330 4120 42~5 434~ 4657
3&~0 3250 3350 425~ 4010 200
3840 3800 3820 422~ 3798 40
43O0 %7~0 4b'/b 4~48 3915 ~30
4600 0470 453~ 4209 4310 130
4910 (860 %885 4274 4385 50
4270 4360 4315 426~ 4438 ~0
3~20 3680 3650 4235 402?
3620 3720 3670 420q 3878
4150 4290 ¢~10 420? 3843 120
3G60 4010 3~35 4L95 3~)8 ~0
4020 3960 1990 4156 4045 50
4~zO 4~MU 4295 4190 4073
4070 4100 4085 4186 4123 ~0
4550 4520 4535 4199 42~3 30
~17o ~n~n go~s 4331 &¢~0 150
4860 4740 ~G00 4251 4B10 120
3570 3620 3595 4229 4499 ~n
*'* Ave;r.'ag¢,e '** 84 84 9.06
COMMENTAry O~ ~TATISTICAL EVALUATION OF UO~R~TE DESZ~N ~SULT~
M~x Num: 0046
Strength: 3500 psi @ 28 Daya
Paragraph 5.5 oX AC£ 318-89 provides that as data becomes
available durin~ uun~ruction, the amount by which (F'cr) must
exceed ~he speclflcd value of (~'c) may bc r~duu.~,"prov~ded:
(a) 30 or mo~, t~st reaul~ are available and avera~¢ of
test results exceeds that required by Section 5.3.2.1,
using a standard deviation calcu].~t,d .~.n a~cordmnce
with'section 5.3.1.1, or
(b) lb to 29 test results are available and average of test
results exceeds that required by Section 5.3.2.1, usinq
a ~Landard deviaslon calculated in accordance with
Section 5.3.1.2.
The required average compressive strength has been calculated
using a ~.h~n.dar~ deviation calculated in accordance with
ACI 318-89 Section 5.3.1.1 or Section 5.3.1.2 and is the lar~er
value of these calculations:
F'cr = F'c + !.34(SD)
= 350U · 1.34( 519.5)
= 4196
F'cr = F'c + 2.33(SD) - 500
= 3500 + 2.33( 519.5) - 500
SUMMARY OF STATISTICAL ANALYSIS
28 Day Test Data
Number of Tests .......................... 30
M~ximum Value ............................ ~290 psi
Minimum Value ............................ 3350 psi
Range~ ................................... 1940 psi
Average Strength ......................... 4229 psi
Standard Deviation ....................... 520 p~i
Requi~ed Average Strengt~ to satisfy
minimum probability conditions of
ACI 318-89 Section 5.3.2.1 ............... 4210 psi
Design excess beyond code requirements... 19 psi
28 Day TOI~ DIt~
Dace
1 03/30/90
2 03/20/S8
3 03/30/98
4 o2/2o/~8
5
8 04~02/98
U
o4/o3/98
o4/oa/se
14 04/0~/98
o4/07/9;
o4/17/28
05/06/28
;?
~8 os/~¢/95
3a 05/~1/98
L~abe= Ambien~ Corte~cCe $1u~(/~
31 70 76 5.~0 ~/A
3~ 84 e0 6,0o
31 70 78 5.25
~o ~8 ~6 ~.00 ~/A
35 73 82 6,00 N/A
31 63 ~7 s.oo ~/A
31 61 66 5.25 N/A
31 ~2 6~ 4,75
70 5.00 N/A
xe ~P v3 G.oo
90 s.oo N/A
50 81 69 ~ nn
78 S.00 ~/A
~B 56 71 ? oo N/A
13 s6 68 5.~5 ~/A
~2 4.~5 ;/A
~ 7~ 82 5.0~ N/A
38 ~7 75 6.S0 ~/A
76 ~.25
~9 g.;0
9o 5.0o ~/A
84 ~.~D
31 78 84 4.S0 ~/A
38 s1 80 4.00 N/A
Peree~t ......... 2~ Day ........ Cumulative
of A/r
PSt I PSI a PST AY; -:< Average Avg of 3 Raage
4920 4890 4895 4895 50
4850 4670 4?$0 4780 4~B~
~990 g~?O ~130 ~O?t ~7 2eO
4000 4110 A05S 4710 4~48 110
4120 4020 4070 4~n~ 44xm ~00
4S8~ 45;0 4620 4606 4~48 120
4880 4520 4?00 4615 44;3
4960 4720 4840 4642 4720 ~40
4430 ~160 429f 4608 46~2 270
4380 4100 41~0 4570 4442
4450 4430 A4AO 4559 4~08 20
45~0 ~bJu 4610 4563 4413 40
4900 ~leg 5040 459~ 4&g? 280
4420 4550 4485 AS7G 4;33 130
4610 4790 4~0 ese] cs~? :Go
4610 4560 4535 4580 4570 ~0
5480 5170 $3~S 4619 ~830
~50 4370 4310 4604 4733 120
4560 4640 4650 460~ 47~2 20
5220 5350 ~290 4S3q 4750 140
4180 4220 4200 4518 4713 ¢0
¢800 4990 45~5 4;30 ¢79£ 190
4530 4330 4430 4622 4508 290
4070 4ZgO ~l~m 46~3 44~0 150
4130 3999 4060 4583 4212 140
4230 4350 4290 (SiS 4167 120
4370 4460 441~ 4553 4~A~
COMMENTARy OF ~TATIETICAL EVALUATIO~
Mix Num~ 0047
SEren~th: 4000 pRt · 28 Day=
Paragraph 5.§ of ACI $18-89 provides that as data becomes
available during ¢onstruuLion, the amount by which (F'cr) must
ewe,ed the specified value of (P'c) may b~ reduced, provided:
(a) 30 or more t,~t result~ are available euid aver~9~ of
test results exceeds that required by Section 5.3.2.1,
usi~ a standard deviation c~]cul~ted ~n
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.%, usin~
a ~tandard d~viation calculated i~ accordance w~th
Section 5.3.1.2.
Th? required average compressive strength has been calculated
using a stands~d deviation calculated in accordallc~ 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
= 4000
~ 448~
F'cr = F'C
.= 4000
4336
+ 1.34( 359.0)
+ 2.33(SD) - 500
+ 2.33( 359.0) ~ 500
SUMMARY OF STATISTICAL ANALYSIS
28 DaY Test Data
Number of Tests .......................... 30
Maximum Value ............................ 5325 psi
Minimum Value ............................ 4055 psi
Range.~ ................................... 1270 psi
Average Strength ......................... 4553 psi
Standard Deviation ....................... 359 p~i
R~quir~d Average Strength to satisfy
m~nimum probability conditions of
ACI 318-89 Section 5.3.2.1 ............... 4481
Design excess beyond code requirements... 72 ps~
Te,q~rature
Tas~ Plane (F~e~eie) Pl&cc~cnC percen= ......... 2~ DaM ........ Cu~u'la~Xve /.~ovI. Lng
~ ~te N~r ~en~ C~re~e ' Sl~p(~n) ~f ~r PSI ~ Psi 2 P~X ~ :A~rage A~ of ~ X~ge
1 0%/01/98 43 T2 B~ 2.S0 3,04 ~280 5220 S200 5200 160
2 O~/OX/~U ~3 ~ n3 2.75 4.~ 4~U 4~v~ 4160 AEBG 180
3 04/01/98 43 70 BO 2.50 4.04 4520 4310 4A15 4592 4592 210
S 04/02/9e 4~ ~S ~ 3.~ 4.0% 4400 4360 4380 442z 42,8
G 04/0~/g9 42 ~4 R~ ~.~ ).~ 4390 4210 42S0 (393 ~x93 280
7 OA/O2/gB 43 ~9 ~0 2.75 %.Or 43~0 412G 4240 4372 4290 240
O 04/02/08 43 70 70 ~.SO 2..2~ 4890 47~ 4828 44~e 4438
9 04/02/20 .43 ~0 70 2.50 3.0~ 4370 4190 4280 4A~Z 4440 ~80
10 04/03/98 43 G4 79 4.75 4.0~ 4310 4260 428~ 4)~ 446]
12 04/03/96 43 60 72 4.50 4.0% 4400 4SS0 4480 4380 429~ 160
24 ~4/03/98 40 63 7~ S.OO 3,74 4870 4900 A88~ 4423 4615 30
XS ~4/0~/~8 &O 62 Se 5.00 4.~ 4600 47~ *'/~U G44~ 4~
16 D~/03/9~ ~o Ss 65 5.2s 5,04 4480 4520 4~0 4i49 4716
~g OA/O3/g8 AG T4 7S 4.7S 4,3% 4500 4430 4495 4464 4~S2 10
19 0i/03/90 40 G2 S9 5.00 3.7~ 4360 4AGO 442~ .4~ A~A
2G ~4/03/ff8 AO t2 ~5 ' 5,00 4,6~ 4330 q280 430S 44~4 4407 5D
2Z 04/03/~6 31 ~8 70 5.00 s.o% 4~SO 4490 4520 4tS~ 441S
~ 04/0~/~a ~0 S~ S4 S,O0 ~/A 3SO0 4130 A05S 4~3~ 42~3 150
23 Q4/06/~8 ~0 56 S6 4.75 N/A 4430 4010 4220 4~29 42~S 420
24 04/06/98 ~0 S6 ' 64 S,00 N/A 4640 4320 44~0 4431 4252 320
2S 04/06/98 ~0 Se 63 5.00 N/A 4750 44~0 4580 442~ 4427 340
26 0%/O~/YU 31 7M 7U 4.bU 5.0q 4600 4370 4485 4439 4515 230
2~ 04/06/~0 31 S4 72 5.$0 4.~% A2S0 4360 4~05 4~34 A457 1L0
2s o4/o6/98 ~1 7o 72 S,o0 4.9% 4220 4180 4200 4(2~ 4~2
30 04/04/9~ 31 Gq ~8 ~.2~ t.7~ 4570 43~0 4465 4421 420G
~6 73 4.30 4 .l~r
~M~ENTA-RY OF gTATIgTICAL EVALUATION OF CONCI~ETE DEgI~N REgULTg
Mix Num.. Q~43
Strength: 4000 psi ~ 28 Days
Paragraph 5.5 of ACl 31~-~ provides that as data becomes
~vail~blu duri~W construction, 'the amo~t by which (F'cr) mus~
exceed the spccificd valuo of (F'c) may bc r~duced, Provld~d:
(a) 30 or more feet result~ are available and averaue of
test results exceeds.thgt required by Section 5.3.2.1,
using a standard dev~atxon.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.requ, ired by Section 5.3.2.1, using
'a standard deviation calculated in accordance with
Section 5.3.1.2.
The reqx/ired average.compressive strength ha~ been calculated
u~ing a otand~rd dev~ation calculate~ in accordance with '
ACI 318-89 Section 5.3.1.1 or Section 5.3.1.2 and is the larger
value of the~e calcu].atJon~:
F'cr = F'c + 1.34 (SD)
= 4000 + 1.34( 263.9)
= 4354
F'cr = F'c + 2.33(SD) - 500
~ 4000 + 2.33( 263.9) - 500
SUMMARY OF STATISTICAL ANALYSIS
28 Day Test Data
Number of Tests .......................... 30
Maxlmu~ V=lue ............................ 5200 psi
Minimum Value ............................ 3950 psi
Rangc; ................................... 1250 poi
Average Strength ......................... 4421 psi
$~andar~ Deviation ............. .......... 2~4 p~i
Required Average Strength to satisfy
minimum Drobability conditions of
ACI 318-89·Section 5.3.2.1 ............... 435A ps%
Design excess beyond code requirements... 67 psm