Effect of pores on heat conduction in concrete: a meso-scale numerical study

Author(s): Liu JIN, Renbo ZHANG, Xiuli DU
Paper category: Proceedings
Book title: 1st International Conference on UHPC Materials and Structures
Editor(s): Caijun Shi and Dehui Wang
ISBN: 978-2-35158-164-3
e-ISBN: 978-2-35158-165-O
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 468-478
Total Pages: 11
Language: English

Abstract: To study the effect of pores on heat conduction behavior in concrete, taking the heterogeneity into account, a meso-scopic simulation method was developed in the present study. In the numerical simulation, concrete in a completely dry state was considered as a heterogeneous material consisting of two phases, i.e., the solid matrix without pores and the pores filled with air. A random structure model of dry concrete which is similar with the random aggregate model was established by assuming that the pores are distributed randomly in the solid matrix. The heat conduction equations were solved using the finite-element method, in which the two phases were meshed separately and the continuity in heat fluxes at interfaces between them was applied. Good agreement between the simulation results and the available test observations illustrates the accuracy and reasonability of the present approach. On the basis of the meso-scale numerical method, a 2D simulation of heat conduction were conducted. Moreover, the influences of some factors, including the shape (circular, squared and triangular), aspect ratio α (the ratio between the major axis and the minor axis of the elliptical pores), distribution patterns of pores and porosity, were explored.

Online publication: 2016
Publication type : full_text
Public price (Euros): 0.00