Mechanical Properties and Microstructure Analysis of Reed Fiber-Reinforced Fluid Fly Ash

doi:10.16552/j.cnki.issn1001-1625.2025.1117

Abstract

Abstract:

In order to address the cracking problem caused by settlement and drying shrinkage of fluid fly ash materials used in the backfill of bridge and culvert abutments in soft soil areas， this paper investigated the mechanical properties of a reed fiber-reinforced fluid fly ash lightweight subgrade filler. Alkali-treated reed fibers with different content （0.2%~1.0%， mass fraction） were added into fluid fly ash， and the microstructural evolution mechanism of the material was analyzed using scanning electron microscopy. The results show that the optimum reed fiber content is 0.4%. Compared with the control group without reed fiber， the 90 d shrinkage value decreases by 25.8%， the 180 d compressive strength increases by 12.8%， and the 90 d splitting tensile strength increases by 21.2%. The water stability coefficients at 28 and 90 d increase to 0.938 and 0.969， respectively， and the 90 d freeze-thaw stability coefficient reaches 0.941. When the reed fiber content exceeds 0.6%， the overall performance of the composite material decreases. Microstructure analysis shows that the reed fibers form a dense gel-bridge structure with the matrix at the later curing stage， which enhances the crack resistance， strength， and long-term durability of the material.

Key words: fluid fly ash, reed fiber, road engineering, mix proportion design, mechanical property, microstructure analysis

CLC Number:

U414

XIAO Qingyi, ZHANG Ziteng, MA Mingxiao, JING Wenlong, LI Ziyi. Mechanical Properties and Microstructure Analysis of Reed Fiber-Reinforced Fluid Fly Ash[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(6): 2181-2190.

Figures/Tables 13

Fig.1 SEM images of reed fiber

Table 1 Basic properties of reed fiber before and after alkali treatment

Item	Density/（g·cm^-3）	Hemicellulose mass fraction/%	Lignin mass fraction/%	Cellulose mass fraction/%	Tensile strength/MPa	Elastic modulus/MPa
Untreated	0.57	26	22	44	24	476
Treated	0.64	15	11	62	32	713

Table 2 Test results of relationship between fluidity and reed fiber content

Reed fiber content/%	0	0.2	0.4	0.6	0.8	1.0
Fluidity/cm	12.4	12.5	12.2	11.6	11.1	10.7

Fig.2 Curve of fluidity versus reed fiber content

Fig.3 Curves of compressive strength versus reed fiber content

Fig.4 Curves of shrinkage value versus reed fiber content

Fig.5 Curves of splitting tensile strength versus reed fiber content

Fig.6 Curves of water stability coefficient versus reed fiber content

Fig.7 Curves of freeze-thaw stability coefficient versus reed fiber content

Fig.8 SEM images and EDS spectrum of 7 d reed fiber-reinforced fluid fly ash

Fig.9 SEM images and EDS spectrum of 28 d reed fiber-reinforced fluid fly ash

Fig.10 SEM images and EDS spectrum of 90 d reed fiber-reinforced fluid fly ash

Fig.11 SEM images of specimens with different reed fiber content

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