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PAGE 64 — MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04)
APPENDIX — ST-45HRM CE CONCRETE PUMPCONCRETE 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
Sacks per cu./meter. 8.5 designed for 1,134 kg. in 28 days
Liters/Gallons per sack 26.9/7.1
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
3.81 cm =1.5 in. 2.54 cm = 1.0 in. 1.90 cm = 0.75 in. .952 cm = 0.375
DESIGN FOR ONE YARD OF CONCRETE (SATURATED & SURFACE DRY):
Absolute volume of aggregate in one cu. yard: 503 liters (17.78 cu. ft.)
Specific gravity of aggregates in one cu. yard: 2.58
Weight of aggregates in one cu. yard batch: 1,293 kg. (2,850 lbs.)
% BATCH SPEC. GRAVITY ABS. VOL.
W.C. Sand 65 1800 2.58 327 liters (11.56 cu. ft)
PEA GRAVEL 35 1000 2.60 176 liters (6.22 cu ft.)
WATER 174 liters/46 gal. 1
CEMENT 6.5 Sack/cu yd 611
CEMENT 8.5 Sack/cu meter 611
TOTAL 27.00
ADMIXTURE: None
SLUMP 10.2 cm (4-inches)
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.