Computers and Concrete

  • 제19권4호
  • /
  • Pages.429-434
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  • 2017
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  • 1598-8198(pISSN)
  • /
  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Influence of nano-silica on the failure mechanism of concrete specimens

  • Nazerigivi, Amin (Rock Mechanics Division, School of Engineering, Tarbiat Modares University) ;
  • Nejati, Hamid Reza (Rock Mechanics Division, School of Engineering, Tarbiat Modares University) ;
  • Ghazvinian, Abdolhadi (Rock Mechanics Division, School of Engineering, Tarbiat Modares University) ;
  • Najigivi, Alireza (Institute for Nanoscience & Nanotechnology (INST), Sharif University of Technology)
  • 투고 : 2016.09.11
  • 심사 : 2017.01.13
  • 발행 : 2017.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Failure of basic structures material is usually accompanied by expansion of interior cracks due to stress concentration at the cracks tip. This phenomenon shows the importance of examination of the failure behavior of concrete structures. To this end, 4 types of mortar samples with different amounts of nano-silica (0%, 0.5%, 1%, and 1.5%) were made to prepare twelve $50{\times}50{\times}50mm$ cubic samples. The goal of this study was to describe the failure and micro-crack growth behavior of the cement mortars in presence of nano-silica particles and control mortars during different curing days. Failure of mortar samples under compressive strength were sensed with acoustic emission technique (AET) at different curing days. It was concluded that the addition of nano-silica particles could modify failure and micro-crack growth behavior of mortar samples. Also, monitoring of acoustic emission parameters exposed differences in failure behavior due to the addition of the nanoparticles. Mortar samples of nano-silica particles revealed stronger shear mode characteristics than those without nanoparticles, which revealed high acoustic activity due to heterogeneous matrix. It is worth mentioning that the highest compressive strength for 3 and 7 test ages obtained from samples with the addition of 1.5% nano-silica particles. On the other hand maximum compressive strength of 28 curing days obtained from samples with 1% combination of nano-silica particles.

키워드

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피인용 문헌

  1. Effect of thermal-induced microcracks on the failure mechanism of rock specimens vol.22, pp.1, 2018, https://doi.org/10.12989/cac.2018.22.1.093
  2. Monitoring of fracture propagation in brittle materials using acoustic emission techniques-A review vol.25, pp.1, 2020, https://doi.org/10.12989/cac.2020.25.1.015