Application of internal curing for mixtures containing high volumes of fly ash |
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| Authors: | Igor De la Varga Javier Castro Dale Bentz Jason Weiss |
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| Affiliation: | 1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Switzerland;2. Institute of Materials and Structures, Riga Technical University, Latvia;3. Department of Building Physics and Building Materials, Lodz University of Technology, Poland;4. Institute for Building Materials (IfB), ETH Zurich, Switzerland;1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland;2. Institute for Building Materials (IfB), ETH Zürich, Switzerland;3. Department of Building Physics and Building Materials, Lodz University of Technology, Poland;4. Siam Research and Innovation, SCG Cement–Building Materials, Saraburi, Thailand;5. Paul Scherrer Institut, 5232 Villigen PSI, Switzerland |
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| Abstract: | This paper focuses on testing performed on mixtures that would be consistent with the mortar portion of a concrete bridge deck mixture for many state departments of transportation. In this work a relatively large percentage of cement (40%, 60%, or 80% by volume) is replaced with Class C fly ash. To overcome concerns associated with slow set and early-age strength development that are often expressed with the high volume fly ash mixtures (HVFA), the water-to-cementitious materials ratio (w/cm) by mass has been reduced from a conventional value of 0.42 to 0.30. To overcome potential complications that the low w/cm may cause in terms of self-desiccation, internal curing (IC) with prewetted lightweight aggregate was used to reduce shrinkage and increase hydration. By adopting this approach (lowering the w/c and using IC) IC HVFA mixtures show additional benefits that should permit their broader application. |
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