Publication detail

Use of Lightweight Sintered Fly Ash Aggregates in Concrete at High Temperatures

KŘÍŽOVÁ, K. BUBENÍK, J. SEDLMAJER, M.

Original Title

Use of Lightweight Sintered Fly Ash Aggregates in Concrete at High Temperatures

Type

journal article in Web of Science

Language

English

Original Abstract

This study addresses the issue of the resistance to high temperatures of lightweight concrete lightweighted with sintered fly ash aggregate. Lightweight concretes with different amounts of lightweighting and their properties after loading temperatures of 600, 800 and 1000 °C were investigated. In particular, the effect of high temperature on the mechanical properties of the concrete was determined on the test specimens, and the effect on the microstructure was investigated by X-ray diffraction analysis and scanning electron microscopy. It was found that there is an increase in compressive strength between 0 and 21% up to 800 °C, where the increase in strength decreases with increasing degree of lightening. At 1000 °C, the internal structure of the lightweight concrete destabilized, and the compressive strength decreased in the range of 51–65%. After loading at 1000 °C, the scanning electron microscope showed the formation of spherical-shaped neoplasms, which significantly reduced the internal integrity of the cement matrix in the lightweight concrete due to the increase in their volume. It was found that the lightweight concretes with higher lightweighting showed significantly less degradation due to higher temperature.

Keywords

sintered fly ash; Agloporite; light weight concrete (LWC); compressive strength; high temperatures; fire resistance

Authors

KŘÍŽOVÁ, K.; BUBENÍK, J.; SEDLMAJER, M.

Released

29. 11. 2022

Publisher

MDPI

Location

Basel, Switzerland

ISBN

2075-5309

Periodical

Buildings

Year of study

12

Number

12

State

Swiss Confederation

Pages count

17

URL

https://www.mdpi.com/2075-5309/12/12/2090

Full text in the Digital Library

http://hdl.handle.net/11012/208569

BibTex

@article{BUT180218,
  author="Klára {Křížová} and Jan {Bubeník} and Martin {Sedlmajer}",
  title="Use of Lightweight Sintered Fly Ash Aggregates in Concrete at High Temperatures",
  journal="Buildings",
  year="2022",
  volume="12",
  number="12",
  pages="17",
  doi="10.3390/buildings12122090",
  issn="2075-5309",
  url="https://www.mdpi.com/2075-5309/12/12/2090"
}