ACI 214R 11:2011 Edition

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214R-11 Guide to Evaluation of Strength Test Results of Concrete

Published By	Publication Date	Number of Pages
ACI	2011	20

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Description

Statistical procedures provide valuable tools for evaluating the results of concrete strength tests. Information derived from such procedures is valuable in defining design criteria, specifications, and other parameters needed for structural evaluation and repair. This guide discusses variations that occur in concrete strength and presents statistical procedures useful in interpreting these variations with respect to specified testing and criteria. Keywords: coefficient of variation; concrete strength; normal distribution;required overdesign; quality control; standard deviation; statistical methods.

PDF Catalog

PDF Pages	PDF Title
3	CONTENTS
4	CHAPTER 1— INTRODUCTION 1.1— Introduction 1.2—Summary CHAPTER 2— NOTATION AND DEFINITIONS 2.1— Notation
5	2.2—Definitions CHAPTER 3— VARIATIONS IN STRENGTH 3.1— General 3.2—Influence of batch-to-batch variations on concrete strength
6	3.3—Influence of within-batch variations on concrete strength CHAPTER 4— ANALYSIS OF STRENGTH DATA 4.1— General 4.2—Statistical functions
7	4.2.1 Mean X 4.2.2 Sample standard deviation s 4.2.3 Additional statistics 4.2.3.1 Coefficient of variation V
8	4.2.3.2 Range R 4.3—Strength variations 4.3.1 Within-batch variation 4.3.2 Batch-to-batch variations 4.3.3 Overall variation 4.4—Interpretation of statistical parameters
9	4.5—Standards of control
10	CHAPTER 5— CRITERIA 5.1— General 5.2—Data used to establish minimum required average strength 5.3—Criteria for strength requirements
12	5.3.1 Criterion No. 1 5.3.1.1 Coefficient of variation method 5.3.1.2 Standard deviation method 5.3.2 Criterion No. 2 5.3.2.1 Coefficient of variation method 5.3.2.2 Standard deviation method 5.3.3 Criteria No. 3 and 4
13	5.3.3.1 Coefficient of variation method, fc′ ≤ 5000 psi(35 MPa) 5.3.3.2 Standard deviation method, fc′ ≤ 5000 psi(35 MPa) 5.3.3.3 Coefficient of variation method, fc′ > 5000 psi(35 MPa) 5.3.3.4 Standard deviation method, fc′ > 5000 psi (35MPa) 5.3.4 Multiple criteria CHAPTER 6— EVALUATION OF DATA 6.1— General
14	6.2—Numbers of tests 6.3—Rejection of doubtful specimens
15	6.4—Additional test requirements 6.5—Quality-control charts 6.5.1 Simple strength chart 6.5.2 Moving average strength
16	6.5.3 Testing variability 6.5.3.1 Purpose 6.5.3.2 Calculation of acceptable testing variation
17	6.5.4 Summary 6.6—Additional evaluation techniques 6.6.1 Overall variability and concrete supplier’s variability 6.6.2 Cumulative sum (CUSUM)
18	CHAPTER 7— REFERENCES 7.1— Referenced standards and reports 7.2—Cited references