Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (4): 1287-1295.doi: 10.13229/j.cnki.jdxbgxb20200209

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Gas permeability and meso-structure of fiber reinforced concrete under carbonation based on different pore sizes

Yi LI(),Yue-qi SU   

  1. School of Resources and Civil Engineering，Northeastern University，Shenyang 110819，China
  • Received:2020-04-13 Online:2021-07-01 Published:2021-07-14

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Abstract:

In order to investigate the relationship between gas permeability and meso-structure of carbonated concrete, carbonation tests and gas permeability tests of ordinary concrete (OC) and polypropylene basalt fiber concrete (BP) with 0, 7, 14, 28, 56 and 80 days carbonation were performed respectively. The parameters of concrete meso-structure were obtained by RapidAir 457 concrete pore structure analyzer (Denmark). Based on the influence levels of different pore size ranges and calculation methods on the air content and fractal dimension of concrete, the pore size of concrete is divided into 0-160 μm, 160-300 μm, 300-4000 μm. The air content and fractal dimension were calculated respectively. The influences of carbonation age and materials on the macroscopic and microscopic properties were analyzed. The internal relationship among the gas permeability, fractal dimension and meso-structure of concrete was studied. Then, the sensitive pore size range was given. The results show that the gas diffusion coefficient and air content of BP are less than that of OC in general, which shows that hybrid can improve the carbonation resistance of concrete by improving the balance of three-dimensional distribution of fiber from different levels. With carbonization age increasing, for OC, the correlation between pore mass fractal dimension in small pore size range and gas diffusion coefficient is higher than other ranges. For BP, the correlation between solid mass fractal dimension in medium pore size range and gas diffusion coefficient is higher than other ranges. The solid mass fractal dimension is employed to characterize the concrete internal structure more accurately than pore mass fractal dimension. Based on the comprehensive analysis of air permeability, fractal dimension and meso-structure, it is identified that the sensitive pore size range of OC is the small pore size rang, and the sensitive pore size range of BP is the medium pore size range.

Key words: fiber concrete, carbonization, gas diffusion coefficient, meso-structure, fractal dimensi

CLC Number: 

  • TU528

Table 1

Physical performance index of fiber"

品种代号纤维种类纤维类型抗拉强度/MPa弹性模量/GPa长度/mm
A玄武岩束状单丝10503430
B聚丙烯束状单丝2763.819

Table 2

Concrete mix proportion"

编号水/kg水泥/kg砂子/kg碎石/kg减水剂/kg聚丙烯纤维/kg玄武岩纤维/kg
C18442871310713.42400
BP18442871310713.4240.92.5

Fig.1

Gas diffusion coefficient of carbonated concrete"

Fig.2

Chord length frequency and gas content of concrete"

Fig.3

Air content of concrete at different pore size stages"

Fig.4

Fractal dimension of concrete in smallpore size range"

Fig.5

Fractal dimension of concrete in medium pore size range"

Fig.6

Fractal dimension of concrete in large pore size range"

Fig.7

Relationship between concrete air content and fractal dimension"

Table 3

Fitting parameters of concrete air content and fractal dimension"

类别P斜率截距R2
C10.033 1－0.002 320.995 760.718 47
C20.000 3－0.018 971.002 010.972 64
C30.001 4－0.005 021.000 900.939 60
BP10.002 5－0.003 721.001 170.919 52
BP20.002 9－0.014 630.999 390.913 77
BP30.003 5－0.002 540.997 440.904 61
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