Development of Prediction Relations From Compression Test Data Using Regression Analysis

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Title: Development of Prediction Relations From Compression Test Data Using Regression Analysis

Author(s): Chetan G. Date and Russel H. Schnnormeier

Publication: Special Publication

Volume: 101

Issue:

Appears on pages(s): 81-98

Keywords: acceptability; compression tests; compressive strength; computer programs; concretes; cylinders; quality control; regression analysis; specifications; statistical analysis.

Date: 9/1/1987

Abstract:
The current trend of fast construction has necessitated the knowledge of the 28-day strength of the concrete cylinder at an early stage. This is achieved by using prediction relations to predict the 28-day strength based on the early test. This article presents a general method to develop the 28-day strength prediction models by analyzing the compression test data statistically and by using the linear regression analysis. A procedure is discussed to develop a computer program to perform the linear regression analysis. A method is also offered to obtain the nonlinear curves from the linear regression analysis program. Two applications of these prediction relations are discussed--prediction of 28-day strength and specification of early strength as an acceptance criterion. As an example, the prediction relations developed for the City of Phoenix are presented.