United States Department of Transportation
i
Evaluating and Optimizing Recycled Concrete Fines in PCC Mixtures Containing Supplementary Cementitious Materials
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2010-08-01
[PDF-2.47 MB]
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Alternative Title:Evaluating and optimizing recycled concrete fines in Portland cement concrete mixtures containing supplementary cementitious materials
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TRIS Online Accession Number:01173909
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OCLC Number:660842549
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Edition:Final Research Report
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Materials
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Abstract:Portland cement concrete (PCC) is used throughout transportation infrastructure, for roads as well as bridges and other structures. One of the most effective ways of making PCC more “green” is to replace a portion of the portland cement (the portion of a PCC mixture with the greatest carbon footprint) with a supplementary cementitious material such as flash or ground granulated blast furnace slag (GGBFS). Since these supplementary cementitious are waste byproducts, they can significantly reduce the carbon footprint of PCC. A consequence of using these materials, however, is that they can reduce the rate of early PCC strength gain. This reduced rate of strength gain can cause problems, especially in urban areas where user costs from delayed construction must be considered when evaluating a project’s overall cost. Previous work (Janssen, et al., 2006) demonstrated that the use of recycled concrete fines could offset some or all of the delayed strength‐gain effects from cement‐GGBFS blends. Current work appears to indicate that the use of such fines could allow for increased cement replacement with no additional reduction in early strength gain. Unfortunately, recycled concrete fines can be quite variable from batch to batch. To effectively utilize recycled concrete fines to offset delayed strength gains associated with the use of supplementary cementitious materials, a procedure must be developed that: 1) evaluates the effectiveness of a specific recycled concrete fines source, and 2) determines PCC mixture proportions that utilize the recycled concrete fines to offset reduced strength‐gain effects associated with the use of supplementary cementitious materials as cement replacement. This procedure must be rapid and inexpensive so that ready‐mix concrete producers could easily perform the procedure whenever a new recycled concrete fines source is obtained.
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