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. 2022 Jul 27;15(15):5204.
doi: 10.3390/ma15155204.

A Comparative Study of the Thermal Conductivities of CBA Porous Concretes

Seung-Tae Jeong  1 , Quang-The Bui  1 , In-Hwan Yang  1
Affiliations

A Comparative Study of the Thermal Conductivities of CBA Porous Concretes

Seung-Tae Jeong et al. Materials (Basel). .

Abstract

Porous concrete has recently gained increasing attention in the construction industry. To improve the properties of porous concrete, coal bottom ash (CBA) was used as the aggregate in the concrete mixtures studied herein. Hybrid CBA aggregates, including a 20% proportion of particles with sizes of 1.2~2.5 mm and an 80% proportion of particles with sizes of 2.5~5.0 mm, were used in the mixtures. Various water/cement ratios ranging from 0.25 to 0.35 were used in the mixtures. The effects of compaction at 0.5, 1.5, and 3.0 MPa on the properties of the porous concrete were also examined. The increase in the water/cement ratio reduced the unit weight and thermal conductivity while increasing the porosity of the porous concrete. Although the compaction had a significant impact on the other properties of the porous concrete, the thermal property was not significantly influenced. By using CBA in porous concrete, the mechanical and thermal properties of the concrete were significantly improved. Finally, the relationships between the thermal conductivity and other properties of the porous concrete were investigated.

Keywords: coal bottom ash aggregate; porosity; porous concrete; thermal conductivity; unit weight.

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Conflict of interest statement

The authors declare that they have no conflict of interest regarding the publication of this manuscript.

Figures

Figure 1
Figure 1
Full-scale test flowchart.
Figure 2
Figure 2
Results of sieve analyses for hybrid CBA.
Figure 3
Figure 3
Schematic drawing for compaction of a cylindrical concrete specimen.
Figure 4
Figure 4
Actual compaction of a cylindrical concrete specimen.
Figure 5
Figure 5
Unit weights of the porous concretes.
Figure 6
Figure 6
Total void ratios of the porous concrete samples.
Figure 7
Figure 7
Thermal conductivities of porous concretes.
Figure 8
Figure 8
Surfaces of porous concrete samples subjected to various compaction levels.
Figure 9
Figure 9
Extraction method. (a) Illustration of extraction method; (b) Extracted pieces.
Figure 10
Figure 10
SEM images of the CBA porous concrete at different positions. (a) Top position; (b) Quarter position; (c) Middle position.
Figure 11
Figure 11
Relationship between unit weight and total void ratio.
Figure 12
Figure 12
Relationship between thermal conductivity and unit weight.
Figure 13
Figure 13
Relationship between thermal conductivity and total void ratio.
See this image and copyright information in PMC

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