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

• Type: Article in International Scientific Journal
• Date: 2015

Authors

Teixeira de Freitas, JAT (Author) Other; Cuong, PT (Author) Other; Rui Faria (Author) FEUP

Journal

Title: International Journal for Numerical Methods in Engineering

Vol. 103

Pages: 364-390

ISSN: 0029-5981

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 8 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 27