Modeling of volume changes of concrete mixed with expansive additives

Hyeonggil Choi, Heesup Choi, Myungkwan Lim, Takafumi Noguchi, Ryoma Kitagaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

This study modeled volume changes of concrete mixed with expansive additives, a countermeasure to shrinkage. Volume changes of expansive paste are determined from the balance between the shrinkage of cement and the expansion of the additives. Therefore, in this study, volume changes were modeled by applying a balance to the hydrates of cement and the expansive additives. The shrinkage of cement was modeled by assuming that it is caused by capillary tension. This modeling was based on the behavior of the moisture inside the cement's pore structure, by taking into account the pore size distribution and the thermodynamic equilibrium state of the moisture. Using the concept of effective radius factor, the expansion of the expansive additives was modeled by considering the volume expansion of the additive particles caused by an increase in the outermost radius of particles of the hydration products that were formed at an early age. The values predicted by the model were consistent with the measured values, which confirms the model's validity. Furthermore, the volume changes of concrete were estimated with sufficient accuracy by analyzing the behavior of the paste using a composite model of aggregate and paste.

Original languageEnglish
Pages (from-to)266-274
Number of pages9
JournalConstruction and Building Materials
Volume75
DOIs
Publication statusPublished - 2015 Jan 30

Keywords

  • Composite model
  • Expansion
  • Expansive additive
  • Modeling
  • Pore structure
  • Shrinkage

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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