Articles
  • Stress and strain behavior of cementitious composites with epoxy/urea-formaldehyde microcapsules under uniaxial tests

  • Tielin Hana,b, Xianfeng Wanga,*, Dawang Lia, Ningxu Hana, Dongfeng Lic and Feng Xinga


  • aGuangdong Key Laboratory of Durability in Coastal Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen, Guangdong 518060, P.R. China
    bSchool of Civil Engineering and Architecture, Xian University of Technology, Shaanxi Xi’an 710048, P.R. China.
    cSchool of Science, Harbin Institute of Technology (Shenzhen), The University Town of Shenzhen, Nanshan, Shenzhen, P.R. China

Abstract

The effects of different dosages of microcapsules, proportion of prepressing stress and curing days on the mechanical properties, pore structure and healing efficiency of the specimens were studied through uniaxial compression test and mercury intrusion porosimetry (MIP) test. The results indicate that the uniaxial strength of the specimens decreased to a certain extent with an increase of dosage of the microcapsules. Meanwhile, the pore structure parameters (pore volume; porosity; critical pore size; capillary porosity), as well as the self-healing rate and recovery rate of the mechanical properties increased with increasing the dosage of microcapsules. The microcapsules have a significant influence on the deformation characteristics of the specimens and may improve the brittleness characteristics and strengthen the ductility of the ordinary concrete.


Keywords: Microcapsules, Cementitious material, Mechanical properties, Deformation, Pore structure, Self-healing rate, Recovery rate

This Article

  • 2019; 20(S1): 46-55

  • Received on Dec 9, 2018
  • Revised on Jan 11, 2019
  • Accepted on Jan 11, 2019

Correspondence to

  • Xianfeng Wang

  • Guangdong Key Laboratory of Durability in Coastal Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen, Guangdong 518060, P.R. China
    Tel : +86-755-2673-2830
    Fax: +86-755-2653-4021

  • E-mail: xfw@szu.edu.cn