Enhancing mechanical properties of engineering cementitious composite by defoamer

Pu Zhang, Junmin Hu, Jixing Yu, Yiwei Weng, Dong Zhang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


The pores introduced by the inclusion of fibers affect the mechanical properties of engineering cementitious composite (ECC). In this paper, the effect of defoamer on the mechanical properties of ECC was investigated. Different contents (0.05 wt.%, 0.10 wt.%, 0.15 wt.%, and 0.20 wt.%) of defoamer were used for this purpose. The results showed that the inclusion of defoamer could significantly increase the compressive strength, first-crack strength, ultimate tensile strength, and tensile strain of ECC. A dosage of 0.15% was the optimal defoamer content for enhancing the mechanical properties of ECC, as further increasing defoamer content beyond 0.15% compromised the efficiency of the improvement. The inclusion of defoamer reduced the total number, size, and volume of pores in ECC, resulting in the increase in the fracture toughness of matrix and fiber/matrix interfacial bond. Based on the micromechanics theory, the inclusion of defoamer increased the pseudo strain hardening(PSH) indexes that govern the multi-cracking behavior. The results from micromechanics analysis well explained the trend of tensile properties of ECC with different defoamer contents.

Original languageEnglish
Article number127670
JournalConstruction and Building Materials
Publication statusPublished - 11 Jul 2022


  • Defoamer
  • Engineered cementitious composite
  • Polyethylene fiber
  • Strain hardening
  • Tensile capacity

ASJC Scopus subject areas

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


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