Modeling of cement hydration in high performance concrete structures with hybrid finite elements

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Teixeira de Freitas, JAT (Autor) Outra; Cuong, PT (Autor) Outra; Rui Faria (Autor) FEUP

Revista

Título: International Journal for Numerical Methods in Engineering

Vol. 103

Páginas: 364-390

ISSN: 0029-5981

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 8 Citações

Outras Informações

ID Authenticus: P-00G-CQZ

DOI: 10.1002/nme.4895

Abstract (EN): A hybrid finite element formulation is used to model the hygro-thermo-chemical process of cement hydration in high performance concrete. The temperature and the relative humidity fields are directly approximated in the domain of the element using naturally hierarchical bases independent of the mapping used to define its geometry. This added flexibility in modeling implies the independent approximation of the heat and moisture flux fields on the boundary of the element, the typical feature of hybrid finite element formulations. The formulation can be implemented using coarse and, eventually, unstructured meshes, which may contain elements with high aspect ratios, an option that can be advantageously used in the simulation of the casting of concrete structural elements. The resulting solving system is sparse and well suited to adaptive refinement and parallelization. It is solved coupling a trapezoidal time integration rule with an adaptation of the Newton-Raphson method designed to preserve symmetry. The relative performance of the formulation is assessed using a set of testing problems supported by experimental data and results obtained with conventional (conform) finite elements. Copyright (c) 2015 John Wiley & Sons, Ltd.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 27