Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (3): 936-945.doi: 10.13229/j.cnki.jdxbgxb20200157

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Influence of surface treatment on basalt fiber reactive powder concrete mechanical properties and fracture characteristics

Han-bing LIU(),Xin GAO,Ya-feng GONG(),Shi-qi LIU,Wen-jun LI   

  1. College of Transportation，Jilin University，Changchun 130022，China
  • Received:2020-03-16 Online:2021-05-01 Published:2021-05-07
  • Contact: Ya-feng GONG E-mail:lhb@jlu.edu.cn;gongyf@jlu.edu.cn

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Abstract:

Coupling agent KH-550 and hydrochloric acid are used for basalt fiber surface treatment to investigate the effect of modification conditions on the mechanical properties and working performance indexes of basalt fiber-reactive powder concrete. The optimum modification conditions were selected as follows： 0.75wt% of coupling agent， 3 mol/L of hydrochloric acid， acid etching temperature of 20 ℃ and etching time of 60 min. By using acoustic emission （AE） technology， the damage characteristics of basalt fiber reactive powder concrete before and after modification were compared to determine the fracture stage and fracture mode of the sample in the fracture test. The results show that in AE parameters， the accumulative AE hit， accumulative energy and amplitude are related to the damage stage of basalt fiber reactive powder concrete， Fiber modification affects the final stage of concrete loading. In addition， during the loading process， the rise angle （RA） and the average frequency （AF） have opposite trends， and their changes are related to the fracture mode.

Key words: architecture material, surface treatment, basalt fiber, reactive powder concrete, mechanical properties, acoustic emission, fracture properties

CLC Number: 

  • TU528.5

Table 1

Basalt fiber performance index"

性 能规范要求取值指标
线密度/tex2400±1202392
断裂强度/（N·km·g-1）≥0.400.69
拉伸强度/MPa≥20002836
弹性模量/GPa≥8587
断裂伸长率/%≥2.53

Table 2

Mix ratio of BFRPC"

水泥石英砂硅灰石英粉玄武岩纤维水减水剂
835939209309416752.17

Table 3

Orthogonal experiment scheme"

组号盐酸浓度/(mol·L-1)刻蚀时间/min刻蚀温度/℃
113020
216040
319060
423040
526060
629020
733060
836020
939040

Fig.1

Schematic diagram of sensor layout"

Fig.2

Compressive strength of BFRPC withmass fraction of KH-550 solution"

Fig.3

Flexural strength of BFRPC with massfraction of KH-550 solution"

Fig.4

Fluidity of BFRPC with massfraction of KH-550 solution"

Fig.5

Range analysis of flexural strength"

Table 4

Variance analysis of flexural strength"

方差来源离差平方和F值临界值
误差0.67-9.0
盐酸浓度3.675.499.0
刻蚀时间1.131.699.0
刻蚀温度0.550.829.0

Fig.6

Range analysis of compressive strength"

Table 5

Variance analysis of compressive strength"

方差来源离差平方和F值临界值
误差47.91-9.0
盐酸浓度0.010.009.0
刻蚀时间10.240.219.0
刻蚀温度22.110.469.0

Fig.7

Range analysis of fluidity"

Table 6

Variance analysis of fluidity"

方差来源离差平方和F值临界值
误差0.83-9.0
盐酸浓度1.501.8149.0
刻蚀时间2.242.7059.0
刻蚀温度0.340.4169.0

Fig.8

History curves of load level versuscumulative AE features"

Fig.9

Relationship diagram of amplitude-load level"

Fig.10

Relationship diagram of moving averageof RA and AF-load level"

Fig.11

Relationship diagram of cumulative RA value,cumulative AF value-load level"

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