CF-Cozby Library-LR 940724E GEE Consultants, Inc.
2540 Glenda Lane · Suite 108 · Dallas, lexas 75229 · (214) 620-9701 · Fax (214) 620-9794
STATISTICAL ANALYSIS OF CONCRETE MIX DESIGN
Rcpo~ Date: July 24, 1994 Sample Date: July, 1994
Cliem: City of Coppell
Project: W.T. Cozby Public Library
Idemification: Statistical Analysis of Compressive Strength Test Results
Method of T~st: ACI 214-77, ACI-318
Mix No: 8203
Required Compressive Strength at 28 days: 3000PSI
Month ending: July, 1994
Test Cast Average 7 Day Average 28 Day 28 Day Moving Cumulative
No. Date Strength (PSI) Strength (PSI) Average of Last 3 (PSI) 28 Day Average {PSI) Remarks
%~'TC 06 4/19/94 3,555 4,530 --- 4,530
WTC 16 4/22/94 2,415 3,970 --- 4.250
WTC 21 4/25/94 4,600* 4,830 4,443 4,443 ~ 24 day break
w'rc 26 4/27/94 2,415 3,530 4.110 4,215
WTC 31 5/05/94 3,165 4,285 4.215 4,229
WTC 36 5/06/94 2,320 3,550 3.788 4.116
WTC 41 5/09/94 3,265 4,350 4,062 4,149
WTC 46 5/18/94 3-,260 3,875 3,925 4,115
~,'I'C 66 5/3 !/94 2,920 3,795 4,007 4.079
WTC 71 6/01 !94 2,745 3,625 3,765 4,034
WTC 76 6/03/94 2,610 3,360 3.593 3,973
WTC 81 6/07/94 2.640 3.725 3.570 3.952
Total number of completed 28 day tests:
28 day average compressive strength (PSi): 3.952
28 day standard deviation (PSlk 453
28 day coefficient of variation (%): 11.5 '~ //.~/z,,~'/
cc: Gary Sieb - City of Coppell Larry Davis - City of Coppell
Mike Sherpinskas - Diversified Construction Services, Inc.
Jim Bullock - F & S Partners
Russell Williams - Brochette Davis Drake, Inc.
All I~tmm ami ~orls am for tl~ ~tchasiv~ ~ of ~ client to w-hmzt ~ at~ addlz:aaod and ~nafl not I~ r~ ~xfthout th~ ~ ap~ of GEE Cou~uJtams. ln~. Th~ u~ of oua- r~rr~ mt~t ,~c~ivz:
mar prior ~,'ritt~n approval. Our i~tmra and ~ apply ,-naiy. to th~ samut,- ~.al~cl and:or ir~p~c~lod mid ate. n¢~ r~sarily indicatix~ of th~ quanti,.i~a of agrparenltly kl~ntical or similar prtxim.na.