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PAGE 20 — C-30HD — PARTS & OPERATION MANUAL — REV. #4 (03/06/01)
CONCRETE MIX INFORMATION
The following information has been extracted from actual testing laboratory reports. The purpose of this printing is only to help
create a better understanding of the importance of uniform gradation and proportioning of materials which affect pumpability of
concrete mixes. These weights and proportions illustrate that when the sieve analysis is ideal, the sand/rock ratio can be adjusted
(65% sand 35% rock) and pumpability should be excellent.
EXAMPLE #1 (A California Test Lab. Report)
JOB: Building Foundations (Water Project)
Sacks per cu./yd. 6.5 designed for 2,500 lbs. in 28 days
Gallons per sack 7.1
Washed Sand-#200 wash 1.3
Organic matter-OK
Specific gravity (SSD) Sand-2.58; Pea Gravel-2.60
Sieve analysis-percent passing
Material 1.5” 1” 3/4” 3/8” #4 #8 #16 #30 #50 #100 #200
W.C. Sand 100 99.7 79.1 60.4 36.5 14.3 4.0 1.1
Pea Gravel 100 3.0
% Comb. 100 66 51 39 23 9 3 1.0
DESIGN FOR ONE YARD OF CONCRETE (SATURATED & SURFACE DRY):
Absolute volume of aggregate in one cu. yard: 17.78 cu. ft.
Specific gravity of aggregates in one cu. yard: 2.58
Weight of aggregates in one cu. yard batch: 2850 lbs.
% BATCH SPEC. GRAVITY ABS. VOL.
W.C. Sand 65 1800 2.58 11.56
PEA GRAVEL 35 1000 2.60 6.22
WATER 46 gal. 1
CEMENT 6.5 sk. 611
TOTAL 27.00
ADMIXTURE: None
SLUMP 4”
REMARKS This mix designed for pumping
NOTE: Due to the availability of well-graded sand as shown in the above sieve analysis,
this mix pumped very successfully.