Medium-term self-healing evaluation of Engineered Cementitious Composites with varying amounts of fly ash and exposure durations

Chung Chan Hung, Yen Fang Su

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Extensive studies have shown that young Engineering Cementitious Composites (ECCs) have the potential to achieve effective self-healing. The present study investigates the medium-term self-healing performance of cracks in ECCs that are relevant in the medium and long-term stages of the material service life. For this purpose, the prepared ECC specimens are pre-cracked at an age of 180 days. The major experimental variables are the weight fraction of fly ash in ECCs (a fly ash to cement ratio of 1.2, 1.6, or 2.0) and the healing duration (7, 28, or 90 days). The medium-term self-healing performance is quantified using a resonant frequency test followed by a uniaxial tensile test. In addition, scanning electron microscopy and energy dispersive X-ray analyses are employed to observe the micro-structure of the healed crack and identify the medium-term healing product, respectively. The results suggest that as long as water is present in the environment, ECCs have moderate medium-term self-healing ability, and can partially recover their tensile mechanical properties. In particular, effective medium-term self-healing performance can be achieved within 90 days of conditioning for ECCs with a pre-strain of less than 1%.

Original languageEnglish
Pages (from-to)194-203
Number of pages10
JournalConstruction and Building Materials
Volume118
DOIs
Publication statusPublished - 2016 Aug 15

All Science Journal Classification (ASJC) codes

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

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