玄武岩纤维活性粉末混凝土与钢绞线粘结滑移过程声学特性表征

doi:10.13229/j.cnki.jdxbgxb.20230081

Abstract

Abstract:

To address the problem of high slope instability due to bonding failure of prestressed anchor cables， the application of prestressed anchor cables in combination with high performance materials was proposed to improve slope resilience. Firstly， the pull-out tests of prestressed steel strands and Basalt Fiber Reactive Powder Concrete （BFRPC） were carried out in the laboratory. The bonding properties of steel strands with a nominal diameter of 15.2 mm under two slurry materials （BFRPC， M40 ordinary cement mortar） were studied， and the failure modes were summarized. Then， based on the distribution law of characteristic parameters， the damage process of reinforced concrete materials under stress state was identified. Secondly， by comparing the RA-AF values， the damage mode of steel strand-concrete during drawing process was clarified. Finally， according to the Ib-value， the stages of crack development of steel strand concrete under different stress states were identified. The results show that： the energy and amplitude law of the three stages are closely related to the damage process such as the generation and expansion of cracks inside the specimen. Through RA-AF analysis， it is concluded that shear cracks mainly occur near the interface concrete， while the macroscopic manifestation of tensile cracks is cracks perpendicular to the loading direction. When the fluctuation difference of Ib-value reaches 0.25， it can be regarded as an early warning value to warn that the prestressed steel strand-concrete material is about to split.

Key words: geotechnical engineering, basalt fiber reactive powder concrete（BFRPC）, acoustic emission, bond-slip, damage analysis

CLC Number:

U417.1

Ya-feng GONG,Shu-zheng WU,Hai-peng BI,Dong-ming ZHOU,Guo-jin TAN,Xiao-ming HUANG. Acoustic characterization of bond⁃slip process between basalt fiber reactive powder concrete and steel strand[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(6): 1819-1832.

Figures/Tables 14

Fig.1

Fig.2

Fig.3

Table 1

Fig.4

Fig.5

Table 2

Statistical of bond strength of each specimen"

试件编号	破坏形式	极限荷载/kN	临界粘结应力 $τ c r$ /MPa	极限粘结应力 $τ u$ /MPa
BFRPC-1-1	拔出	65.29	10.79	15.58
BFRPC-1-1	拔出	62.59	10.21	14.93
BFRPC-1-3	拔出	59.32	10.15	14.15
BFRPC-2-1	拔出	58.23	10.96	13.89
BFRPC-2-3	拔出	57.96	9.26	13.83
BFRPC-2-3	拔出	59.20	9.85	14.12
BFRPC-3-1	拔出	61.22	10.61	14.60
BFRPC-3-1	拔出	62.73	10.64	14.96
BFRPC-3-1	拔出	60.58	10.12	14.45
OCM-1-1	拔出	44.30	7.61	10.57
OCM-1-2	拔出	46.52	7.82	11.10
OCM-1-3	拔出	42.03	6.95	10.03
OCM-2-1	劈裂	44.43	7.95	10.60
OCM-2-2	拔出	45.28	7.10	10.80
OCM-2-3	拔出	41.06	6.88	9.80
OCM-3-1	拔出	45.61	7.70	10.88
OCM-3-2	拔出	45.28	7.62	10.80
OCM-3-3	拔出	44.91	7.31	10.71

Table 2

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

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Acoustic characterization of bond⁃slip process between basalt fiber reactive powder concrete and steel strand

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