Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

A continuum coupled thermo-hygro mechanical time-dependent model for concrete

Jefferson, Anthony Duncan and Chitez, Adriana 2015. A continuum coupled thermo-hygro mechanical time-dependent model for concrete. Presented at: CONCREEP 10: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, Vienna, Austria, 21-23 September 2015. Proceedings: CONCREEP 10: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures. American Society of Civil Engineers, pp. 397-403. 10.1061/9780784479346.047

Full text not available from this repository.

Abstract

An overview of a recently developed thermo-hygro-mechanical-hydration model (THMH) model for concrete is presented. The coupled flow aspect of the model solves a mass balance equation for moisture and an enthalpy balance equation for heat transport. A key assumption used to simplify the moisture flow component of the model is that the gas pressure is assumed to remain constant at atmospheric pressure. The model simulates early age concrete behaviour and therefore a hydration component is included in the formulation. This uses the approach of Schindler & Folliard, which was based on a comprehensive range of data and gives good predictions for a range of cement types. The mechanical component of the model simulates the dependence of the strength and stiffness properties of the model on the degree of hydration. Furthermore, the plastic-damage-contact model of Jefferson and Mihai; which simulates cracking, crushing and crack closure; has been extended to include hydration dependent behaviour. The hydration sub-model is also linked to a new creep model. The paper includes an example of the analysis of beam RL1 from the Concrack benchmark programme. The focus of the work from this benchmark is the accurate prediction of crack widths in reinforced concrete elements and reference is made to a recent study that explored the accuracy of the present model in this context. A critique of the model is presented which concludes that the moisture flow component of the model would be greatly improved by including coupling between the flow parameters and mechanical damage.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: American Society of Civil Engineers
Last Modified: 04 Jun 2017 09:15
URI: http://orca.cf.ac.uk/id/eprint/92755

Actions (repository staff only)

Edit Item Edit Item