Study on the degradation of dynamic mechanical properties and the microstructure of concrete after acid attack

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (14) : 126-132.

NIE Liang-xue1, 2, XU Jin-yu1, 3，WANG Hong-wei4，LIU Zhiqun1,LUO Xin5

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Abstract

For the purpose of delve deep into the mechanism of dynamic mechanical properties degradation of concrete after acid attack, a comparative study is done between dynamic compressive strength ( ), impact toughness (IT) and scanning electron microscope (SEM) to understand the micro-level aspect of concrete specimens which have been immersed in acidic solution. Results of the experimental indicated that: After 60-days acid corrosion, the and IT both increase with the increasing of strain rate, and have a significant drop, too; The original structure of concrete has been destroyed, and the internal porosity has been increased, the unhydrated cement particles and products of hydration reaction such as crystal and gel are straggling and disordering. The acid environment has a significant effect of weaken the mechanical performance of concrete.

Key words

Acid corrosion / Dynamic compressive strength / Impact toughness / Strain rate / Scanning electron microscopy

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NIE Liang-xue1, 2, XU Jin-yu1, 3，WANG Hong-wei4，LIU Zhiqun1,LUO Xin5. Study on the degradation of dynamic mechanical properties and the microstructure of concrete after acid attack[J]. Journal of Vibration and Shock, 2017, 36(14): 126-132

References

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[1] 金祖权, 孙伟, 张云升, 等, 混凝土在硫酸盐氯盐溶液中的损伤过程[J]. 硅酸盐学报, 2006, 34(5): 630-635.
JIN Zu-quan, SUN Wei, ZHANG Yun-sheng, Damage of concrete in sulfate and chloride solution[J]. Journal of the Chinese Ceramic Society, 2006, 34(5): 630-635.
[2] Fan Y F, Hu Z Q, Zhang Y Z, et al. Deterioration of compressive property of concrete under simulated acid rain environment[J]. Construction and Building Materials, 2010, 24(10): 1975-1983.
[3] Gerengi H, Kocak Y, Jazdzewska A, et al. Electrochemical investigations on the corrosion behaviour of reinforcing steel in diatomite-and zeolite-containing concrete exposed to sulphuric acid[J]. Construction and Building Materials, 2013, 49: 471-477.
[4] Hekal E E, Kishar E, Mostafa H. Magnesium sulfate attack on hardened blended cement pastes under different circumstances[J]. Cement and Concrete Research, 2002, 32(9): 1421-1427.
[5] Song H, Chen J. Effect of damage evolution on poisson's ratio of concrete under sulfate attack[J]. Acta Mechanica Solida Sinica, 2011, 24(3): 209-215.
[6] Sun C, Chen J, Zhu J, et al. A new diffusion model of sulfate ions in concrete[J]. Construction and Building Materials, 2013, 39: 39-45.
[7] Gama B A. Split Hopkinson pressure bar technique: experiments, analyses and applications. United States: the Faculty of the University of Deevolutionare, Spring; 2004.
[8] 胡时胜, 王礼立, 宋力, 等. Hopkinson压杆技术在中国的发展回顾[J]. 爆炸与冲击, 2014, 34(6): 641-657.
Hu Shi-sheng, Wang Li-li, Song Li, et al, Review of the development of Hopkinson pressure bar technique in China[J]. Explosion and Shock Waves, 2014, 34(6): 641-657.
[9] Ravichandran G, Subhash G. Critical appraisal of limiting strain rates for compression testing of ceramics in a split Hopkinson pressure bar[J]. Journal of the American Ceramic Society, 1994, 77(1): 263-267.
[10] Yuan H, Dangla P, Chatellier P, et al. Degradation modeling of concrete submitted to biogenic acid attack[J]. Cement and Concrete Research, 2015, 70: 29-38.
[11] Bazle A G. Split Hopkinson pressure bar technique: experiments, analyses and applications. United States: the Faculty of the University of Delaware, Spring; 2004.
[12] 赵习金,卢芳云,王悟,等.入射波整形技术的实验和理论研究[J].高压物理学报,2004,18(3):231-236.
ZHAO Xi-jin, LU Fang-yun, WANG Wu, et al. The experimental and theoretical study on the incident pulse shaping technique [J]. Chinese Journal of High Pressure Physics, 2004, 18(3): 231-236.
[13] 李为民,许金余. 大直径分离式霍普金森压杆试验中的波形整形技术研究[J]. 兵工学报,2009,30(3):350-355.
LI Wei-min, XU Jin-yu. Pulse shaping techniques for large-diameter split Hopkinson pressure bar test [J]. Acta Armamentarii, 2009,30(3):350-355.
[14] 王海龙, 李庆斌. 饱和混凝土静动力抗压强度变化的细观力学机理[J]. 水利学报, 2006, 37(8): 958-968.
WANG Hai-long, LI Qing-bin. Micro-mechanism of static and dynamic strengths for saturated concrete[J]. Journal of Hydraulic Engineering, 2006, 37(8): 958-968.
[15] Luo X, Sun W, Chan S Y N. Effect of heating and cooling regimes on residual strength and microstructure of normal strength and high-performance concrete[J]. Cement and Concrete Research, 2000, 30(3): 379-383.
[16] Gregerová M, Všianský D. Identification of concrete deteriorating minerals by polarizing and scanning electron microscopy[J]. Materials Characterization, 2009, 60(7): 680-685.