Age-Adjusted Effective Elastic Modulus of High-Performance Concrete at Early Age

Arosha Dabarera, Liang Li, Jiahang Li, Vishvendra Singh Jamwal, Qifan Yang, Vinh Dao

Research output: Chapter in Book/Report/Conference proceedingChapter


One of the key parameters governing the stresses due to restrained deformation, and thereby the associated risk of cracking, is the elastic modulus of concrete. The early-age evolution of the elastic modulus is intrinsically a function of the development of hydration degree. For concrete subjected to sustained loads, the elastic modulus evolves with creep and relaxation properties. Many design methods use the concept of effective elastic modulus or age-adjusted effective elastic modulus to account for such effects. The challenge with the existing approaches is the lack of in-depth knowledge and reliable test data to accurately determine creep and aging effects for predicting elastic modulus evolution under sustained loading conditions. This paper first provides a brief review of the current approaches to determine the elastic modulus evolution under sustained loading at early age. Second, a method is proposed to directly obtain the age-adjusted effective elastic modulus (Eaaef(t, t0)) evolution experimentally by utilizing an advanced Temperature Stress Testing Machine. Such evolution of Eaaef(t, t0) in a high-performance concrete subjected to a sustained tensile stress of 30% of the 3-day tensile strength is experimentally obtained. The test data are compared with the pure elastic modulus evolution. The creep and aging coefficients are derived based on the newly-measured test data. Differences between obtained early-age creep coefficients and that predicted by existing approaches are comparatively investigated. In addition, on the basis of newly-measured test data and analytical investigations, a convenient approach to determine Eaaef(t, t0) using time-dependent profiles of reduction factors is proposed.

Original languageEnglish
Title of host publicationRILEM Bookseries
PublisherSpringer Nature
Number of pages10
Publication statusPublished - 2021

Publication series

NameRILEM Bookseries
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852


  • Age-adjusted effective elastic modulus
  • Creep coefficient
  • Early age
  • High-performance concrete
  • Reduction factor


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