Guidelines for Concrete Mixtures Containing Supplementary Cementitious Materials to Enhance Durability of Bridge Decks (2007) / Chapter Skim
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1Background Premature deterioration of our nation's concrete bridges has been a persistent and frustrating problem to those responsible for maintaining those bridges as well as to the traveling public. The deterioration typically consists of concrete delamination and spalling due to various mechanisms, including corrosion of embedded steel reinforcement, repeated freezing and thawing, deicing salt–induced scaling, or reactive aggregates.
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The methodology for designing concrete mixtures containing supplementary cementitious materials presented in these Guidelines is aimed at aiding the user in conducting an experimental study to select the optimum combination of locally available materials. It is intended for use in the development phase of concrete construction projects where durability is a main objective.
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is created for each test response. The type of SCMs and general ranges of SCM content that are expected to produce this performance are also identified.
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The term "factor" refers to the independent variable, or x-variable, to be varied in the experiment. There are several kinds of factors.
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mixture tested at 5000 psi (34.5 MPa) or higher after 7 days, it might be considered highly desirable and that mixture would be given a desirability for 7-day strength of 1.
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desirability functions. Because a mixture that receives a desirability of 0 on a single test will have an overall desirability of 0, the performance range assigned to 0 by the function will make that mixture unacceptable regardless of performance in all other categories.
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testing and the predicted performance difference between the BPC and the BTC. Application of Methodology Flowcharts, worksheets for summarizing information, background discussions of the issues relevant to decisions that need to be made, tables of experimental matrices, and an explanation of the statistical analyses are provided in these Guidelines to aid the user in the application of each of these steps.
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Computational Tool In parallel with these Guidelines, SEDOC -- a computational tool consisting of Microsoft® Excel–based worksheets -- was developed to automate several of these tasks. SEDOC is described in detail in the user's guide available on the TRB website (http://www.trb.org/news/blurb_detail.
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