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Table 1. Compressive Strength and Variability for RCC Spillways – QA Control Cylinders
Structure
Batchplant Type 1
C+P Content
W/(C+P) Ratio
Compressive strength (lb/in2)
Standard deviation
Coefficient of variation
Ib/yd3
28 day
90 day
1 year
ib/in2
%
Cold Springs
CW-P
292+0
0.52
5670*
7280 3/
540 2/
9.5 2
Ochoco
CV-P
434+0
0.50
4930*
6230
1335*
27*
0.55
3936
3
733
19
0.45
6265
543
9
Pueblo
BW-C
120+180
0.47
2230
4830*
430
9
Many farms
BW-C
141+280
0.37
5480
6635*
7020
566*
8.5
1/ CW Continuous Weigh Plant; CV Continuous Volumetric Plant; BW Individual Batch Weigh Plant; P Pugmill Mixer; C Compulsory Mixer; D Drum Mixer 2/ * Standard deviation and coefficient of variation for the indicated design strength and test age. 3/ Cores tested two to three years after construction.