Multiscale Modeling and Simulation of Concrete and Its Constituent Materials

Released on by Weidong Wu
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  • Multiscale Modeling and Simulation of Concrete and Its Constituent Materials Book Detail

  • Author : Weidong Wu
  • Release Date : 2008
  • Publisher :
  • Genre :
  • Pages : 380
  • ISBN 13 :
  • File Size : 29,29 MB
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Multiscale Modeling and Simulation of Concrete and Its Constituent Materials by Weidong Wu PDF Summary

Book Description: Abstract: The main objective of this dissertation is to numerically simulate concrete using multiscale modeling technique. Namely, we first study the mechanical properties of individual concrete constituent materials (cement clinkers, hydrated cement products, sand, and aggregate mineral crystals), and then propose a micromechanics hydrated cement paste (HCP) model to predict properties of calcium-silicate-hydrate (C-S-H), cement paste, and concrete from nano to macro (continuum) scales. At nano and molecular scale, fundamental mechanical properties of constitutive mineral crystals of cement, hydrated cement paste, sand and aggregate are calculated by molecular dynamics (MD) simulation. The results of nano level are used as the input of at next level: sub micro scale. We study the mechanical properties of low density (LD) and high density (HD) C-S-H by the use of microporomechanics and micromechanics theories at this scale. At micro scale, effective properties of cement paste and mortar are predicted with the help of micromechanics of composite theory and our proposed microstructural model of HCP. Void effect is introduced by empirical porosity-elastic property relation. A novel nondestructive testing technique resonant ultrasonic spectroscopy (RUS) is applied successfully to measure the elastic constants of hydrated cement paste with water:cement ratio of 0.4. Our HCP simulation results match the RUS testing values quite well. Finally at macro (continuum) scale, we employ both lattice model and micromechanics generalized method of cells (GMC) to compute the effective properties of concrete. The two methods produce very similar effective elastic moduli which agree with the destructive experimental testing results. Effect of interfacial transition zone (ITZ) is included in the lattice model simulation. And stiffness of aggregate on the properties of concrete are assessed by both simulation methods. This research attempts to lay a solid foundation for multiscale modeling of cement based materials by the computation of mechanical properties of concrete individual constituent materials, and propose a method to predict the effective properties of concrete at different levels. In the end, we summarize methodologies which could be applied to the multiscale modeling of "future generation concrete and cement based composites."

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