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ACI 214 Evaluation of Strength Test Results of Concrete
Editorial Task Group
Monday March 19, 2012
1:00 to 2:00 PM
Meeting Room REVERCHON BHyatt Regency
Dallas, TX
Task Group Objective:
Provide recommendations to the 214 committee for the direction of the 214 documents so that the documents remain a relevant, consolidated resources used by the industry to correctly apply basic statistical concepts to various concrete tests, while providing guidance on interpretation and the limitations of statistical inference.
Meeting Objective:
Clarification and Consensus on Chapter content.
Assign Lead persons for each chapter.
Establish Timeline for milestones and completion.
Summary report for Main Committee
Call to order. Welcome members and guests.
Briefly review and discuss outline (attached).
Chapter Assignments
Chapter 1Introduction and Scope
Chapter 2Notation and Definitions
Chapter 3History of 214
Chapter 4Basis of Statistical Methods
Chapter 5Application of Statistical Methods to Strength Test Data
Chapter 6Application of Statistical Methods to ACI 318/ACI 301 Mix Design Criteria.
Chapter 7Evaluation of Strength Test Data
Chapter 8Applicability of Methods to other concrete tests.
Chapter 8Percent With Limits Pay Factors
Chapter 9Other Statistical Tools
Chapter 11References
Timeline
Rough Draft Toronto
Final Draft Minneapolis
Ballot Document Phoenix
Review summary report for presentation to full committee.
Outline Discussed in Tampa
Here is an outline for the next update to the 214R document. The envisioned outcome is a document that is a consolidated resource used by the industry to correctly apply basic statistical concepts to various concrete tests, provide guidance on proper interpretation and the limitations of inference.
If this is a vision shared by the committee, I hope that this outline can be a starting point for developing goals, task lists, and a timetable for completion. If it is not, perhaps the outline will provoke sufficient discussion in the committee to develop a shared vision for the next generation of the 214R document.
Guide to Evaluation of Strength Test Results of Concrete
Reported by ACI Committee 214
Chapter 1Introduction and Scope
Use current content. Perhaps expand to include stronger language regarding applicability of these statistical concepts to other types of concrete related tests.
Chapter 2Notation and Definitions
This chapter captures all notations and definitions in the document.
Chapter 3History of 214
Summarize the history of the committee and its documents over the years from the introduction of the use of statistical acceptance criteria, through the adoption by 318 to the current status of statistical methods.
Chapter 4Basis of Statistical Methods
General discussion of statistical methods used and why they apply to concrete strength testing. Use current chapter 3 as a starting point. Briefly explain Tchebysheffs Theorem, the normal distribution, population, sample, estimates of population standard deviation, mean, coefficient of variation, student t, necessity of random sampling, outlying observations, etc. Also include discussion of control charts, sources of variability, and anova?
Chapter 5Application of Statistical Methods to Strength Test Data
Use current chapter 3 as a guide.
Chapter 6Application of Statistical Methods to ACI 318/ACI 301 Mix Design Criteria.
Use chapter 4 as a guide.
Chapter 7Evaluation of Strength Test Data
Include discussion of variability. ANOVA? Why data are not normally distributed. Discuss control chart use and identifying trends. ACI 318/301 acceptance of strength criteria.
Chapter 8Applicability of Methods to other concrete tests.
Discuss other tests, slump, air, unit weight, aggregate grading, FM, flexural strength, coulomb testing.
Chapter 8Percent With Limits Pay Factors
Discuss basis for pay factors. Include how they are developed, owners risk, contractors risk, operating curves, etc. Currently used by FAA, FHWA, COE, and many state DOTs.
Chapter 9Other Statistical Tools
CuSum, Anova, Spread Sheet Tools.
Chapter 11References
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