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

Previous Articles    

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

RICH HTML

 6   

PDF (PC)

190

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
1 Dong L F, Zhang S P. Effect of steel fiber on comprehensive performance of concrete materials[J]. Applied Mechanics and Materials, 2015, 723:440-444.
2 Liu J, Yao S, Ba M, et al. Effects of carbonation on micro structures of hardened cement paste[J]. Journal of Wuhan University of Technology (Mater Sci Ed), 2016, 31(1):146-150.
3 Lu Bao, Shi Cai-jun, Cao Zhi-jie, et al. Effect of carbonated coarse recycled concrete aggregate on the properties and microstructure of recycled concrete[J]. Journal of Cleaner Production,2019,233:421-428.
4 郭子麟. 单面冻融条件下玄武岩纤维混凝土孔结构及力学性能研究[D]. 包头:内蒙古工业大学土木工程学院, 2018.
Guo Zi-lin. Study on pore structure and mechanical properties of basalt fiber reinforced concrete under single-sided freeze-thaw condition[D]. Baotou: School of Civil Engineering,Inner Mongolia University of Technology, 2018.
5 Jin S, Zhang J, Han S. Fractal analysis of relation between strength and pore structure of hardened mortar[J]. Construction and Building Materials, 2017, 135:1-7.
6 张俊芝, 吕萌, 方赵峰, 等. 基于核磁共振的粉煤灰混凝土水和气体渗透性与孔结构的研究[J]. 南昌工程学院学报, 2018,37(6):63-70.
Zhang Jun-zhi, Lü Meng, Fang Zhao-feng, et al. Study on water and gas permeability and pore structure of fly ash concrete based on NMR[J]. Journal of Nanchang Institute of Technology, 2018, 37(6): 63-70.
7 Bu J, Tian Z. Relationship between pore structure and compressive strength of concrete: experiments and statistical modeling[J]. Sādhanā, 2016, 41(3):1-8.
8 郭明磊, 肖佳, 左胜浩. 水泥-石灰石粉胶凝材料孔结构多重分形特征以及与渗透性的关系[J]. 硅酸盐学报,2019,47(5):1-8.
Guo Ming-lei, Xiao Jia, Zuo Sheng-hao. Multifractal characteristics of pore structure of cement limestone cementitious materials and its relationship with permeability [J]. Journal of the Chinese Ceramic Society, 2019,47(5): 1-8.
9 宋凯强. 混杂纤维混凝土碳化性能与孔结构研究[D]. 沈阳:东北大学资源与土木工程学院,2017.
Song Kai-qiang. Study on carbonation performance and pore structure of hybrid fiber concrete[D]. Shenyang: School of Resources and Civil Engineering of Northeast University, 2017.
10 Perrier E M A, Bird N R A. Modelling soil fragmentation: the pore solid fractal approach[J]. Soil & Tillage Research,2002,64(1):91-99.
11 Vahab Naderi Zarnaghi, Fouroghi-Asl Ali, Nourani Vahid, et al. On the pore structures of lightweight self-compacting concrete containing silica fume[J]. Construction and Building Materials,2018,193:557-564.
12 Gao Yun, Wu Kai, Jiang Jin-yang. Examination and modeling of fractality for pore-solid structure in cement paste: starting from the mercury intrusion porosimetry test[J]. Construction and Building Materials,2016,124:237-243.
13 侯超群, 席瑶, 孙志彬, 等. 基于IPP图像处理的膨胀土微观结构定量研究[J].水文地质工程地质,2019,46(2):156-161.
Hou Chao-qun, Xi Yao, Sun Zhi-bin, et al. Quantitative study on microstructure of expansive soil based on IPP image processing[J]. Hydrogeology & Engineering Geology, 2019,46(2): 156-161.
14 张文生, 张建波, 李建勇, 等.混凝土孔隙面分形特征与测试方法研究[J]. 建筑材料学报,2012,15(3):312-316.
Zhang Wen-sheng, Zhang Jian-bo, Li Jian-yong, et al. Study on fractal characteristics and test methods of concrete pore surface[J]. Journal of Building Materials, 2012,15(3): 312-316.
15 丁一宁,马跃,郝晓卫.基于分形理论分析裂缝形态对纤维/混凝土渗透性的影响[J].复合材料学报:2020,37(11): 2908-2916.
Ding Yi-ning, Ma Yue, Hao Xiao-wei. Analysis of the influence of crack shape on the permeability of fiber / concrete based on fractal theory[J]. Acta Materiae Compositae Sinica, 2020, 37(11): 2908-2916.
16 Cui Shen-gai, Liu Pin, Cui En-qi, et al. Experimental study on mechanical property and pore structure of concrete for shotcrete use in a hot-dry environment of high geothermal tunnels[J]. Construction and Building Materials, 2018, 173:124-135.
17 Almeida A E F S, Tonoli G H D, Santos S F, et al. Improved durability of vegetable fiber reinforced cement composite subject to accelerated carbonation at early age[J]. Cement and Concrete Composites, 2013, 42:49-58.
18 Li Yang, Fu Teng-huan, Wang Rui-jun, et al. An assessment of microcracks in the interfacial transition zone of recycled concrete aggregates cured by CO2[J]. Construction and Building Materials, 2020, 236: 214-221.
19 Flores Medina N, Barluenga G, Hernández-Olivares F. Enhancement of durability of concrete composites containing natural pozzolans blended cement through the use of Polypropylene fibers[J]. Composites Part B, 2014,61:214-221.
20 赵燕茹, 郭子麟, 范晓奇, 等.玄武岩纤维混凝土应力应变关系及孔结构分析[J].硅酸盐通报,2017,36(12):4142-4150.
Zhao Yan-ru, Guo Zi-lin, Fan Xiao-qi, et al. Stress strain relationship and pore structure analysis of basalt fiber reinforced concrete[J]. Bulletin of the Chinese Ceramic Society, 2017, 36 (12): 4142-4150.
21 Qing Lü, Qiu Qing-li, Zheng Jun, et al. Fractal dimension of concrete incorporating silica fume and its correlations to pore structure, strength and permeability[J]. Construction and Building Materials,2019,No.228.
22 刘俊亮, 田长安, 曾燕伟, 等. 分形多孔介质孔隙微结构参数与渗透率的分维关系[J].水科学进展,2006(6):812-817.
Liu Jun-liang, Tian Chang-an, Zeng Yan-wei, et al. Fractal dimension relationship between pore microstructure parameters and permeability of fractal porous media [J]. Advance in Water Science, 2006(6): 812-817.
[1] ZHU Hong, ZHANG Hai, TANG Gao-di, LI Zhong-yun, LIU Yi-nong. Detection of presence of deception jamming based on information dimension [J]. 吉林大学学报(工学版), 2016, 46(2): 616-620.
[2] FU Shuang,LI Yi-bing,YE Fang,GAO Zhen-guo. Fast blind spectrum sensing using Sevcik fractal dimension in frequency domain [J]. 吉林大学学报(工学版), 2014, 44(3): 854-860.
[3] WU Xiao-xuan, NI Zhi-wei, NI Li-ping. Clustering ensembles algorithm based on fractal dimension [J]. 吉林大学学报(工学版), 2012, 42(增刊1): 364-367.
[4] YANG Dong-feng, MA Xiu-lian. Identification of egg shell crack based on fractal texture analysis [J]. 吉林大学学报(工学版), 2011, 41(增刊1): 348-352.
[5] HE Kai， YAN Lei. Improved Fractal Dimensional Algorithm of Romote Sensing Image Improved Fractal Dimensional Algorithm of Romote Sensing Image with Random Midpoint Replacement Method [J]. 吉林大学学报(工学版), 2005, 35(06): 617-0620.
[6] GAO Lun, LIAN Xiang-ming, LIU Xiang-yang, WANG Li-jiang. Fractal character of workpiece surface processed by cryogenic polishing without abrasive [J]. 吉林大学学报(工学版), 2004, (1): 7-11.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
No Suggested Reading articles found!
Copyright © Journal of Jilin University(Engineering and Technology Edition), All Rights Reserved.
Tel: +86-431-85095297　Fax: +86-431-85094074　E-mail: xbgxb@jlu.edu.cn
Powered by Beijing Magtech Co. Ltd