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Surface cracking and fractal characteristics of bending fractured polypropylene fiber‐reinforced geopolymer mortar
Li, Li1,2; Sun, Hai Xin1; Zhang, Yang3; Yu, Bo4
2021-12-01
Source PublicationFractal and Fractional
ISSN2504-3110
Volume5Issue:4
Abstract

Fiber is effective in restricting cracks and improving the toughness of geopolymer composites, but few studies have focused on the surface crack characteristics of fiber‐reinforced geopolymer composites. In this paper, after flexural tests of polypropylene fiber‐reinforced geopolymer mortar, the surface cracking image was collected by a digital camera and cracking information was extract by deep learning. Finally, the cracking and fractal characteristics were specifically discussed. The semantic segmentation network can accurately extract surface cracks for calculating various parameters. The results showed that the mean intersection over union (mIoU) and mean pixel accuracy (mPA) of the cracks are 0.8451 and 0.9213, respectively. Generally, the crack length, width, area, and fractal dimension of the specimen are all increased with the increase in the fiber volume fraction. These crack parameters grow rapidly when the fiber content is small, and the growth of the crack parameters gradually slows down as the fiber volume fraction increases to approximately 1.5%. The highest crack parameter values were found in the geopolymer mortar, with a 0.48 water–binder ratio and 12 mm fiber length. The variation of the bottom crack length and the side crack fractal dimension can be used to represent the overall crack variation patterns. Meanwhile, the crack parameters increase with the increased fiber factor in a quadratic function. Based on these crack parameters, the critical fiber factor and dense fiber factor of polypropylene fiber‐reinforced geopolymer mortar were 200 and 550, respectively. They are greater than those of fiber‐reinforced Portland cementitious composites. The influence of various crack parameters on the flexural strength is in the order of the crack area, width, length, and fractal dimension.

KeywordCracking Characteristics Flexural Behavior Fractal Geopolymer Polypropylene Fiber
DOI10.3390/fractalfract5040142
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaMathematics
WOS SubjectMathematics, Interdisciplinary Applications
WOS IDWOS:000737056600001
Scopus ID2-s2.0-85116433841
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Cited Times [WOS]:17   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorYu, Bo
Affiliation1.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, 712100, China
2.State Key Laboratory of Green Building Materials, Beijing, 100024, China
3.State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering, University of Macau, 999078, Macao
4.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety and College of Civil Engineering & Architecture, Guangxi University, Nanning, 530004, China
Recommended Citation
GB/T 7714
Li, Li,Sun, Hai Xin,Zhang, Yang,et al. Surface cracking and fractal characteristics of bending fractured polypropylene fiber‐reinforced geopolymer mortar[J]. Fractal and Fractional,2021,5(4).
APA Li, Li,Sun, Hai Xin,Zhang, Yang,&Yu, Bo.(2021).Surface cracking and fractal characteristics of bending fractured polypropylene fiber‐reinforced geopolymer mortar.Fractal and Fractional,5(4).
MLA Li, Li,et al."Surface cracking and fractal characteristics of bending fractured polypropylene fiber‐reinforced geopolymer mortar".Fractal and Fractional 5.4(2021).
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