Structural Engineering and Mechanics

  • 제82권4호
  • /
  • Pages.543-556
  • /
  • 2022
  • /
  • 1225-4568(pISSN)
  • /
  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Strength and microstructure of composites with cement matrixes modified by fly ash and active seeds of C-S-H phase

  • Golewski, Grzegorz Ludwik (Faculty of Civil Engineering and Architecture, Lublin University of Technology) ;
  • Szostak, Bartosz (Faculty of Civil Engineering and Architecture, Lublin University of Technology)
  • 투고 : 2021.10.02
  • 심사 : 2022.02.18
  • 발행 : 2022.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

Fly ash (FA) is the main additive to concretes currently produced. This substitute of ordinary Portland cement (OPC) have a positive effect on the structure and mechanical parameters of mature concrete. Unfortunately, the problem of using FA as the OPC replacement is that it significantly reduces the performance of concretes in the early stages of their curing. This limits the possibility of using this type of concrete, e.g., in the prefabrication, where it is required to obtain high strength composites after short periods of their curing. In order to minimize these negative effects, research has been undertaken to increase the early strength of the concretes with FA through the application of a specially dedicated chemical nanoadmixture (NA) in the form of seeds of the C-S-H phase. Therefore, this paper presents results of tests of modified concretes both with the addition of FA and with NA. The analyses were carried out based on the results of the macroscopic and microstructural tests in 5 time periods, i.e. after: 4, 8, 12, 24 and 72 hours. The greatest increase in mechanical strength parameters and rapid development of the basic matrix phases in composites in the first 12 hours of composites curing was observed.

키워드

과제정보

This work was financially supported by Ministry of Science and Higher Education within the statutory research number FD-22/IL-4/017.

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