Computation of Required Average Strength (f 'cr) for a Specified Compressive Strength (f 'c)

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Title: Computation of Required Average Strength (f 'cr) for a Specified Compressive Strength (f 'c)

Author(s): P. Balaguru and Ahmed Ezeldin

Publication: Special Publication

Volume: 101

Issue:

Appears on pages(s): 65-80

Keywords: acceptability; compressive strength; computer programs; concretes; flow charting; microcomputers; specifications; standard deviation.

Date: 9/1/1987

Abstract:
This report presents a computer program for the computation of required average strength, f'cr, based on the field strength test data. Based on the recent Code (ACI 318-83), four different cases--available data more than or equal to 30, available data for two consecutive sets more than or equal to 30, available data more than or equal to 15 but less than 30, and no field data available for comparable concrete--are identified and solved. The necessary equations and flow chart are presented so the reader more clearly understands the sequence of operations. Input/output data are explained using sample problems that illustrate the capability of the program to handle the different cases. The steps presented are written for one particular brand of computer, but the specialized commands are kept to a minimum so that the user can easily modify the program to other types of similar widely used computers.