Abstract
This investigation introduces the formulation of a new closed-form representation of the evolution of the relative compressive strength of a class of ultrahigh-performance concrete (UHPC) materials hydrated under saturated and adiabatic conditions. The Laplace transformation of the governing differential equation for the maturity leads to an accurate estimation of the sample equivalent age at the reference temperature. The maturity allows the estimation of the relative strength attained by means of a simple, previously experimentally verified, linear hyperbolic model expressed in the frame of the reference temperature. The evolution of the relative strength at the reference temperature provides a universal frame for the description of that evolution in samples hydrating under saturated and adiabatic conditions but starting at different temperatures. All required model parameters are identified through virtual tests. Parametric studies on the relative compressive strength evolution and their comparison with other semiempirical models in the literature revealed that the saturated and adiabatic hydration of low water-to-binder ratio silica-fume UHPC follows a proper version of the law of mass action in chemistry.
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Acknowledgments
Permission to publish was granted by the Director, Geotechnical and Structures Laboratory. This investigation was funded by the ERDC Military Engineering Research Program: Material Modeling for Force Protection under the work unit Micro-Structural Synthesis and Property Simulation. The study hinges on the results of the NIST VCCTL predictions on the properties of hydrated cementitious microstructures. The authors gratefully acknowledge this seminal research work.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 1 • January 2018
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©2017 American Society of Civil Engineers.
History
Received: Feb 7, 2017
Accepted: Jun 26, 2017
Published online: Nov 11, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 11, 2018
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