Experimental study on pore structure characteristics and thermal conductivity of fibers reinforced foamed concrete

The pore structure characteristics and thermal conductivity of foamed concrete (FC) reinforced with glass fibers (GF), polyvinyl alcohol fibers (PVAF) and polypropylene fibers (PPF) were investigated experimentally in this article. Firstly, GF, PVAF or PPF with different mass fractions (0%, 1%, 1.5%...

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Bibliographic Details
Published in:PloS one 2023-07, Vol.18 (7), p.e0287690-e0287690
Main Authors: Li, Lin, Wang, Wei, Wang, Yu, Li, Dongxu, Zhuang, Mei-Ling
Format: Article
Language:English
Subjects:
Cement
Computer and Information Sciences
Concrete
Concrete mixing
Digital imaging
Dry density
Electric properties
Energy efficiency
Engineering and Technology
Fibers
Fly ash
Foaming
Foaming agents
Glass fiber reinforced plastics
Heat conductivity
Heat transfer
Insulation
Mechanical properties
Optimization
Physical Sciences
Polypropylene
Polyvinyl alcohol
Pore size
Pore size distribution
Pores
Porosity
Portland cement
Portland cements
Research and Analysis Methods
Roundness
Shape
Shape factor
Size distribution
Software
Temperature
Thermal conductivity
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Summary:The pore structure characteristics and thermal conductivity of foamed concrete (FC) reinforced with glass fibers (GF), polyvinyl alcohol fibers (PVAF) and polypropylene fibers (PPF) were investigated experimentally in this article. Firstly, GF, PVAF or PPF with different mass fractions (0%, 1%, 1.5% and 2%) were added to the Portland cement, fly ash and plant protein foaming agent to prepare the FC. Then, SEM tests, dry density tests, porosity tests, and thermal conductivity tests were carried out on FRFC. Later, the adhesion of GF, PVAF and FFF with different mass fractions to the cementitious base was investigated by SEM images of FRFC. The pore size distribution, shape factor and porosity of FRFC were analyzed using Photoshop software and Image Pro Plus (IPP) software. Finally, the effects of different mass fractions and lengths of three types of fibers on the thermal conductivity of FRFC were discussed. The results indicated that proper fiber mass fraction can play a role of refining small pores and separating large pores, improving the structural compactness, reducing the pore collapse phenomenon and optimizing the pore structure of FRFC. The three types of fibers can promote the optimization of cellular roundness and increase the proportion of pores with diameters below 400 μm. The FC with larger porosity had smaller dry density. As the fiber mass fraction increased, the thermal conductivity performed a phenomenon of first decrease and then increase. The three types of fibers with 1% mass fraction achieved relatively low thermal conductivity. Compared with the FC without fibers, the thermal conductivities of GF reinforced FC, PVAF reinforced FC and PPF reinforced FC with 1% mass fraction were decreased by 20.73%, 18.23% and 7.00%, respectively.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0287690