Next Article in Journal
Numerical Simulations of Laser and Hybrid S700MC T-Joint Welding
Next Article in Special Issue
Microstructural and Thermo-Physical Characterization of a Water Hyacinth Petiole for Thermal Insulation Particle Board Manufacture
Previous Article in Journal
Durability of the Bond between CFRP and Concrete Exposed to Thermal Cycles
Previous Article in Special Issue
Compression Strength Mechanisms of Low-Density Fibrous Materials
Article Menu
Issue 3 (February-1) cover image

Export Article

Open AccessArticle

Rate-Type Age-Dependent Constitutive Formulation of Concrete Loaded at an Early Age

Depertment of Civil and Environmental Engineering, Konkuk University, 120 Neungdong-ro Gwangjin-gu, Seoul 05029, Korea
*
Author to whom correspondence should be addressed.
Materials 2019, 12(3), 514; https://doi.org/10.3390/ma12030514
Received: 14 January 2019 / Revised: 31 January 2019 / Accepted: 5 February 2019 / Published: 8 February 2019
(This article belongs to the Special Issue Mechanical Characterization of Bio-Based Materials and Structures)
  |  
PDF [3242 KB, uploaded 11 February 2019]
  |  

Abstract

A general formulation framework for an age-dependent constitutive equation of concrete is presented to account for the development of the elastic modulus at an early age. This is achieved by expanding the total stress vs. strain relation with respect to the time-varying elastic modulus. Two types of constitutive formulation frameworks are derived depending on whether (or not) the time-varying effect of the elastic modulus was taken into account in the linearized series expansion. The causes for the age-dependent deformations under sustained loads are defined in the formulation based on the two internal mechanisms of delayed elasticity and the ageing phenomenon. The ageing phenomenon is incorporated in a conventional delayed strain concept in terms of the variable elastic modulus with time. Four cases of age-dependent constitutive equations are formulated within the presented formulation framework by employing different types of creep models. The mechanical characteristics of the terms that comprise the various constitutive equations are examined and compared. Numerical application of the time-dependent test results of cylindrical specimens indicate that the creep formulation that considered the elastic modulus development showed a good agreement with the experimental result while the formulation that did not consider the elastic modulus development underestimated the result by 15%. View Full-Text
Keywords: concrete; creep; shrinkage; time-varying elastic modulus; age-dependent constitutive model concrete; creep; shrinkage; time-varying elastic modulus; age-dependent constitutive model
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Kim, S.-G.; Park, Y.-S.; Lee, Y.-H. Rate-Type Age-Dependent Constitutive Formulation of Concrete Loaded at an Early Age. Materials 2019, 12, 514.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top