[1] Zhao Yasong, Gao Jianming, Qi Bing, Liu Chuanbei, et al. Effect of flexural loading on degradation progress of recycledaggregate concrete subjected to sulfate attack and wetting-drying cycles [J]. Journal of Southeast University (English Edition), 2019, 35 (1): 83-88. [doi:10.3969/j.issn.1003-7985.2019.01.012]

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Effect of flexural loading on degradation progress of recycledaggregate concrete subjected to sulfate attack and wetting-drying cycles()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

35

Issue:

2019 1

Page:

83-88

Research Field:

Materials Sciences and Engineering

Publishing date:

2019-03-30

Info

Title:

Effect of flexural loading on degradation progress of recycledaggregate concrete subjected to sulfate attack and wetting-drying cycles

Author(s):

Zhao Yasong;  Gao Jianming;  Qi Bing;  Liu Chuanbei

School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China

Keywords:

recycled aggregate concrete;  degradation;  sulfate attack;  flexural loading;  wetting-drying cycles

PACS:

TU528

DOI:

10.3969/j.issn.1003-7985.2019.01.012

Abstract:

The degradation progress of recycled aggregate concrete(RAC)subjected to sulfate attack under wetting-drying cycles and flexural loading is studied. Three different stress ratios(0, 0.3 and 0.5)were applied in this test. The variations of relative dynamic elastic modulus E_rd and water-soluble SO^2-₄ contents in RAC were used to evaluate degradation progress. The changes in mineral products and microstructures of interior concrete were investigated by means of X-ray diffraction(XRD), the environmental scanning electron microscope(ESEM)and X-ray computed tomography(X-CT). The results indicate that flexural loading accelerates the degradation of RAC under sulfate attack and wetting-drying cycles by expediting the transmission of SO^2-₄ into interior concrete. Furthermore, the accelerated effect of flexural loading is more obvious with the increase of stress ratio, that is because higher stress ratios can accelerate the extension of microcracks and generate more channels for the transmission of SO^2-₄. Also, more expansive products(gypsum and ettringite)are generated by the reaction of Ca(OH)₂ with SO^2-₄, which can further accelerate the degradation of RAC.

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Memo

Memo:

Biographies: Zhao Yasong(1993—), male, Ph.D. candidate; Gao Jianming(corresponding author), male, doctor, professor, 101000879@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 51578141), the Major State Basic Research Development Program of China(No. 2015CB655102), China-Japanese Research Cooperative Program—Ministry of Science and Technology in China(No. 2016YFE0118200).
Citation: Zhao Yasong, Gao Jianming, Qi Bing, et. al.Effect of flexural loading on degradation progress of recycled aggregate concrete subjected to sulfate attack and wetting-drying cycles[J].Journal of Southeast University(English Edition), 2019, 35(1):83-88.DOI:10.3969/j.issn.1003-7985.2019.01.012.

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