Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 302, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.124207
Keywords
Cellulose fiber-reinforced concrete; Sulfate dry-wet attack; Fly ash; Pore distribution
Categories
Funding
- National Science Foun-dation of China [52079109, 51722907, 51922088, 51979224, 51679197, 52009110]
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The study found that fly ash (FA) has a negative effect on the initial mechanical properties of cellulose fiber-reinforced concrete (CFRC), but low-volume FA can significantly improve the mechanical properties of CFRC, while 30% FA may impact the durability of CFRC. In addition, micropores and mesopores are favorable for the sulfate resistance durability of CFRC.
In this work, the deterioration characteristics of the mechanical properties of cellulose fiber-reinforced concrete (CFRC) under sulfate dry-wet cycles were studied. The influence of 10%, 20%, and 30% cement replacement with fly ash (FA) on the durability of CFRC was also considered. After 180 dry-wet cycles, the CFRC soaked in sodium sulfate solution with 5% concentration was tested. The mechanical properties were evaluated, including mass loss, the uniaxial stress-strain relationship, and the splitting tensile strength. Results show that FA has a negative effect on the initial mechanical properties of CFRC. The sulfate resistance durability of CFRC is greatly affected by the FA content. Compared with CFRC without FA, low-volume FA can significantly improve the mechanical properties. However, 30% FA has a negative impact on the durability of CFRC. In addition, the pore information parameters obtained by nuclear magnetic resonance indicate that macropores have a negative effect on the sulfate resistance durability of CFRC, whereas micropores and mesopores are favorable. In contrast, 20% FA can refine the pores and improve the strength of the matrix, thus improving the durability of CFRC.
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