Use of Lightweight Sintered Fly Ash Aggregates in Concrete at High Temperatures
Buildings, ISSN: 2075-5309, Vol: 12, Issue: 12
2022
- 5Citations
- 15Captures
- 2Mentions
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Most Recent News
Researchers from Brno University of Technology Report on Findings in Building Construction (Use of Lightweight Sintered Fly Ash Aggregates in Concrete at High Temperatures)
2023 JAN 11 (NewsRx) -- By a News Reporter-Staff News Editor at Daily Real Estate News -- Data detailed on building construction have been presented.
Article Description
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.
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