STRUCTURAL CONCRETE SUBDIVISION
J~E
5000 PSI CONCRETE
PRELIMINARY INVESTIGATION OF MIX DESIGN
Introduction
This concrete investigation was initiated at the request of the Bridge
Design Division to provide basic information for design and construction of
cQst in place post-tensioned bridge members. The concrete proportions were
selected on the basis of strength, durability, and place~ability required for
this type of construction.
MATERIALS
Following are listed the materials used in this investigation and their
sources:
Cement:
Water Reduc
Air
3/4" Stone and Sand
Lebanon Crushed Stone, Inc. West Lebanon, New Hampshire
Type I
Glens Falls Portland Cement Co. Glens Falls, New York
Admixture:
Plastiment
Sika Chemical Corp. Passaic, Ne'v Jersey
Admixture:
NVX
Hercules Powder Co. Wilmington, Delmvare
used in
ACI Standard 211.1-70
Procedures
the mixes c
practice for selec
followed those outlined in
for normal
\veight The mix designs and data used in establishing them are noted in
the follo\ving table.
Mix Design #1 Mix Design :/f2
coarse Aggregate lbs/cu.yd. (dry) 1862 1947
Fine Aggregate lbs/cu.yd. (dry) 1147 1067
Ratio Fine Aggregate to Total Aggregate (%) 39.6 36.9
Cement 725 725
Water-Cement Ratio .40 .40
Slump (inches) 2-3 2-3
Air Content (percent) 6 6
Compressive Strength at 28 days, (psi) 5000 5000
Water Reducing-Retarding Admixture (oz/sk)
Three batches of each design were mixed in a Lancaster open pan mixer and the
concrete was tested for consistency, air content, relative yield, and compressive
strength. Standard 6xl2 inch cylinders, cast in treated cardboard molds, \vere con
tinuously moist cured and tested in compression at ages of 3, 7, 14, and 28 days.
Results
Consistency:
Air contents of all batches ranged from 5~ to 6 percent as measured by the Chace
Air Indicator. These results correlated closely with the Standard pressure meter
test which was occasionally used for confirmation.
Relative Yield:
The per cubic foot and relative
c with the following results being obtained:
Weight Per Cubic Foot (lbs)
Relative (%)
Compressive Strength:
Mix
150.58
99.9
of the two mix
150.30
100.2
Compressive strength results are shown in the accompanying tables.
r--
3 Days
Batch A 4368
Batch B 4483
Batch C 4112
Average 4321
3 Days
Batch A 3979
Batch B 4253
Batch C 4067
Average 4100
Mix Design 1/:l
_l_Days
5049
5438
4810
5099 ·-1-
Mix Design ffo2
7 Days
4855
4695
4828
4793
14 Days
5368
5739
5085
14 Days
5359
5385
5359
5368
28 Days
5854
5987
5597
5813
28 Days
5615
5730
5615
5653
concrete des for 5000 psi satisfac with results
exhibiting an average strength of 5733 psi.
Both the slump and air content were within anticipated tolerances.
Conclusions & Recommendations
The mix design used in this investigation is satisfactory for field use provided
rigid control be maintained relative to slump and air content. Due to the higher
strengths involved, it would not be detrimental to durability to lower the air content
to 5%. This would further increase compressive strength.
It should be noted that if variations in materials are anticipated, relative to
cement or aggregate sources and admixture manufacturers, further investigations should
be conducted in the laboratory. Also, if construction practices result in lower
strengths, provisions should be made in the specifications for necessary adjustments.
Although very stiff mixes are commonly used in both pre-stressed and post ten
sioned concrete, complete and thorough vibration in the forms is necessary to insure
proper consolidation.
Penetration Strength 4000 psi 28,Day
I f
·~--.· ~r,•- ('""'\
.• :......:~ ... ~v..::\ . ..1..
Cor.:.crete T'ests
~:Ba..:....;.c_;t_h_l'l_·o_.,'-+1 _P:J=-r-:-oc-c_·~_~o_r~P..-e_n-:e-:t-:r-:a_t_i_o_n_• -:I,_A_i_l_~ _c_o_n_. J_ce_=-n_t_--r!....,.:=.~.;;;;.e.;;;;;m=.:.:p-0 __ j;-s...:l:::-u-.i"'"""'P~J-__,I c oq~:.: ;; ssive Strength !K'I: p, "15_' I 500) psi Ll,OOO j~_si Percent Degrees .inches l 3 D2.y 17 Ja_y j28- Day w, · -R"'-"'---'--"'-'---'-_.:1--'-'---'--!!---=-r-r'--_1-A~ s ., I I-ter:: " 1 1 I
IAy_e.r2.ge -" I I I I
6
Ave~0&~~~--~--------~------~--~------------~----~---Water Content (Avg" ~o of· reduc-'Giom due to ~( !f ~), ~ru-.S±rength (Avg,, ~~ o:f ilncrease due to Reta.rder) Time o:f Scrtti1?P; (Avg@ % of Deyiat:ion 1 due to' Retarder) Time of Setting (Avg,. Increase in Hrsa due to .Retarder ),r
Notes::
-_.: e:·-~
__ l I / <' y
3 Day 7...::D;_a~y'-----,;-:-2-.--8-=-D,.a..::..y_ 1 tni.tb~ Final :
Fin.:-tl
r:•··.~~··rn ,·--.· .,.,.- ~"' ... ~...,J .1. ... ~ ... _:..,.,.-v..:.\.l
p~i;ng:t;J:t__(!L vv" 0o of iinc:rease due to Reta:cde:r Time of S~:tt:J='~'S {Avg 2 % of Deviatj.on • d.L-\e to, Hota~r.-de:r) Time of Settinp Avo Increase in Hrso due to.Retarder
Notes::
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Laboratory Calculated Concrete Design
Class_:_Concrete; Item----
For use on all projects in area using this source Concrete Nix from
-----~--~-------~-----~~--~------Aggregate from:
# l Stone...;;:;;;;;;.....';:;...-..--..:...-~~-----~--·_> Sp;c~ific Gravity-----
/1 2 Stone SPecific Gravity ___ ..L_
Sand SPecific Gravity "? --------~--------------------- ~~--~~~--
Design:
(, Bags of Cement Per Yard , ~_"'f7T""% Sand to total aggregate volume ~~-~s Air Entrainment (--% l?ea Stone to total stone volume =Gallons H
2o Per Sack Cement
Air Entrainment Cement
c ~ X . ' ""'"(;,4o--
J % X 27.000 -----_.J'o Air Entrainment
Sand (_if'% Sand to total aggregate volume )
II 2 Stone (j~ of total stone volume)
II 1 Stone
Dry Weights:
Santi. 7/ X62 .4"' . l/2 Stone 64=
Ill Stone "' X X62 .4= ------------- ---------Mix:
11 Stone "' Lbs. ----ff Stone ::: Lbs. ---
Sand ::::1 Lbs.
Cement e: Lbs.
""
~_?just for lvloisture -
lbse
L I (.) f) Lbso £,
Lbs.
Lbs.
6' {') r 0 :>
)
Laboratory Calculated Concrete Design
Class Concrete; Item ----For use on all projects ir.~ area using this source Concrete Hix from .
-------·--_;-.·~-------~~
Aggregate from:
# l Stone SPecific Gravity --~-~---....-,..------- ·--·----
Design:
·~ 1 Bags of Cement Per Yard .:/0 % Sand to total aggregate volume ~:~)% Air Entrainment ·~-% :Pea Stone to total stone volume -·;-;~Gallons H
2o Per Sack Cement
Air Entrainment Cement
--··Gallons H2o Per Bag Cement X -·r:4-rr--
(.. • 7b Air Entrainment % X 27 cOOO ._..__.__,~-
Sand C/{) J'v Sand to total aggregate volume )
II 2 Stone (/r) {J % of total stone volume)
II l Stone
Dry vJe·.i.ghts:
Sand "" X62.4:-l
X )j _ _Y:_62 .4a ...
Ill Stone "" X X62.4"" -------Nix:
11 Stone "' Lbs.
11 Stone :::: Lbs.
Sand "" Lbso
Cement ~J .. bs.
Gallons'H o· Per Yd - 2 0
Ad,just for lV!oisture -~----·~·----------~
Gals
·~------
"' :· I C,F.!...
L1 if t) Lbso
I ? / /U Lbs.
Lbs.
. )~ Jv<+. (;
/ )
Date
Labo:catory Calculated Concrete Design
Class Concrete; Item -k--.~ -------
For use on all projects in area using this source Concrete Hix .from
Aggregate from:
II l Stone~--·~-~~·--~--"' _____ SPecific Gravit;z ____ _
Design:
, Bags of Cement Per Yard ;-·-% Sand to total aggregate volume · -\?-·% Air Entrainment . / t-:-;:~··% Pea Stone to total stone volume
· ' ~~:_::Gallons H2o Per Sack Cement
Air Entrainment Cement
--··Gallons H2o Per Bag Cement
~, .·.. % Air Entrainment
Sanci C/!£.;% Sand to total aggregate volume. )
II 2 Stone ( ~ of total stone volume)
II 1 Stone
Dry vJeights:
Sand
112 Stone :::: X62.4"" ---...:.....--Ill Stone ;:: X X62.4~ ------------------ ---------
Hix:
II Stone "" Lbse ~
II Stone = Lbs. ---Sand "' Lbso
Cement t::: J..~bs. ~
Galloni.FH o· Per Yd. = . 2 -----------
Adjust for lvloisture -"""~·--·· -
SPecific
Gals
"' /, ~~--
"" " c.F, _._._, ....... _
I Lbs. ------
I
