|Table of Contents|

[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, (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:
Issue:
2021年第1期
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.
Last Update: 2021-03-20