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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 8 Abstracts search results
Document:
SP101-02
Date:
September 1, 1987
Author(s):
R. L. Dilly, V. Beizai, and W. L. Vogt
Publication:
Symposium Papers
Volume:
101
Abstract:
Pullout testing provides a measurement of in-place strength of concrete, and maturity can be used to estimate strength development. Test statistics are useful tools for interpreting the significance of the data. Maturity may correlate to pullout strength by regression analysis. The simplest correlation would be linear using the logarithm of maturity. Linear relationships may be compared using test statistics to determine if slopes and/or intercepts are significantly different. Statistical analysis techniques are used to evaluate pullout strength and maturity data. Some limitations associated with these techniques are discussed. A programmable calculator was used to develop the programs to illustrate the application of these analysis techniques.
DOI:
10.14359/3832
SP101-06
Frances M. Kelsi
Using linear regression to analyze concrete strength data, the Corps of Engineers has developed two computer programs that help predict 90-day strengths from one-day accelerated cured-cylinder strengths. These programs use equations from ACI 214-77 and provide the user with standard deviations, predicted strengths, and graphs of the data for concrete that can be used for any design age.
10.14359/3826
SP101-05
Chetan G. Date and Russel H. Schnnormeier
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.
10.14359/3842
SP101-07
Bruce Suprenant and Kent Barnes
This paper is intended to show the application of ACI 214-77 and the use of computer-generated data in evaluating concrete data. A computer program written in FORTRAN 77 and utilizing a CALCOMP plotter is used to analyze concrete strength results in accordance with ACI 214-77. To facilitate interpretation of the results, the following information is plotted: average of individual tests, five-test moving average, average strength, and required strength; test range, ten-test moving average range, and average range; and a five- and ten-test moving coefficient of variation and the overall coefficient of variation. Besides providing the information required by ACI 214-77, other concrete data is provided. For instance, histograms of the strength test results are plotted. Slump and entrained air content are plotted if this information is available. The slump and air data may prove to be beneficial when interpreting individual strength tests. A case study is examined to determine the usefulness of the FORTRAN program and the benefits provided by computer plotting of concrete data.
10.14359/3828
SP101-01
Nicholas J. Carino and William C. Stone
In-place testing offers the contractor an alternative to testing field-cured cylinders for assessing concrete strength during critical phases of construction. A relationship between cylinder compressive strength and the quantity measured by in-place tests is needed to use these methods; this requires statistical analysis of test data. The personal computer and "electronic spreadsheet" software provide a cost-effective means of performing such analyses. Available spreadsheet software can be used to perform the required calculations automatically, thus providing the user with the benefits of automated computation without requiring knowledge of a scientific computing language. Data from a study of the pullout test method are used to illustrate the use of spreadsheet software to perform linear regression and determine the required correlation relationship. In addition, a simplified technique is proposed for using the results of in-place tests to make a reliable estimate of the characteristic strength of structural concrete. The in-place characteristic strength permits an evaluation of structural safety during construction.
10.14359/3823
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