[1] Da Bo, , Yu Hongfa, et al. Effect of carbonation-drying-wetting on durabilityof coral aggregate seawater concrete [J]. Journal of Southeast University (English Edition), 2021, 37 (1): 67-74. [doi:10.3969/j.issn.1003-7985.2021.01.009]

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Effect of carbonation-drying-wetting on durabilityof coral aggregate seawater concrete()

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

Volumn:

37

Issue:

2021 1

Page:

67-74

Research Field:

Materials Sciences and Engineering

Publishing date:

2021-03-20

Info

Title:

Effect of carbonation-drying-wetting on durabilityof coral aggregate seawater concrete

Author(s):

Da Bo¹;  2;  3;  4;  Yu Hongfa⁵;  Ma Haiyan⁵;  Dou Xuemei⁵;  Wu Zhangyu⁵;  Chen Yan¹

¹College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China
²Yangtze Institute for Conservation and Development, Hohai University, Nanjing 210098, China
³Nantong Institute of Marine and Offshore Engineering, Hohai University, Nantong 226300, China
⁴Key Laboratory of Coastal Disaster and Defence of Ministry of Education, Hohai University, Nanjing 210098, China
⁵Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Keywords:

coral aggregate seawater concrete;  drying-wetting cycles;  carbonation-drying-wetting cycles;  mass loss rate;  relative dynamic elastic modulus;  ultrasound wave velocity

PACS:

TU528

DOI:

10.3969/j.issn.1003-7985.2021.01.009

Abstract:

Based on the drying-wetting cycles experiment and the carbonation-drying-wetting cycles experiment for coral aggregate seawater concrete(CASC)with different strength grades, the effects of carbonation-drying-wetting on the durability of CASC are studied with the surface state, mass loss rate, relative dynamic elastic modulus, ultrasonic wave velocity and cube compressive strength as indices. Results show that the mass loss rate of CASC increases gradually with the increase in cycle times in the drying-wetting and carbonation-drying-wetting cycles. The mass loss rate increases relatively slowly at the initial stage but it increases remarkably after 10 cycles. The relative dynamic elastic modulus and ultrasonic wave velocity decrease gradually with the increase in cycle times. After 6 cycles, the decrease rate of the relative dynamic elastic modulus and ultrasonic wave velocity of CASC tends to be flat and the surface is slightly damaged. Compared with the initial 28 d cube compressive strength, the cube compressive strength of CASC decreases by 8.8% to 11.0%. Drying-wetting cycles and carbonation can accelerate seawater erosion on CASC, and drying-wetting cycles result in salting-out and accelerate the destruction of concrete. Therefore, the carbonation-drying-wetting accelerates the destruction of CASC.

References:

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Memo

Memo:

Biography: Da Bo(1988—), male, doctor, associate professor, dabo@hhu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No.11832013, 51878350), the Fundamental Research Funds for the Central Universities(No.B210202023), the Natural Science Foundation of Jiangsu Province(No.BK20180433), the Water Resources Science and Technology Project of Jiangsu Province(No.2020017), the Basic Science Research Project of Nantong(No.JC2020120), the Key Laboratory of Coastal Disaster and Defence of Ministry of Education(Hohai University)(No.202006).
Citation: Da Bo, Yu Hongfa, Ma Haiyan, et al.Effect of carbonation-drying-wetting on durability of coral aggregate seawater concrete[J].Journal of Southeast University(English Edition), 2021, 37(1):67-74.DOI:10.3969/j.issn.1003-7985.2021.01.009.

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