[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()

干湿-碳化耦合作用对全珊瑚海水混凝土耐久性的影响

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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

干湿-碳化耦合作用对全珊瑚海水混凝土耐久性的影响

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

达波¹;  2;  3;  4;  余红发⁵;  麻海燕⁵;  窦雪梅⁵;  吴彰钰⁵;  陈岩¹

¹河海大学港口海岸与近海工程学院, 南京 210098; ²河海大学长江保护与绿色发展研究院, 南京 210098; ³南通河海大学海洋与近海工程研究院, 南通 226300; ⁴河海大学海岸灾害及防护教育部重点实验室, 南京 210098; ⁵南京航空航天大学土木工程系, 南京 210016

Keywords:

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

全珊瑚海水混凝土;  干湿循环;  干湿-碳化耦合作用;  质量损失率;  动弹性模量;  超声波波速

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.

通过对不同强度等级的全珊瑚海水混凝土(CASC)进行海水干湿循环试验和海水干湿-碳化耦合循环试验, 以表面状态、质量损失率、动弹性模量、超声波波速、立方体抗压强度为评价指标, 研究干湿循环、碳化和干湿-碳化耦合作用对CASC耐久性的影响.结果表明:干湿循环、干湿-碳化耦合作用下, CASC的质量损失率均随着侵蚀时间的延长而逐渐增加, 先期比较平缓, 增长幅度不大, 经过10次循环后, 其质量损失率的增长幅度明显增大;而CASC的动弹性模量和超声波波速均随着循环次数的增加逐渐降低, 经过6次循环后, 其速率趋于平缓, 表面有微损伤;与初始28 d立方体抗压强度相比, CASC的立方体抗压强度下降幅度为8.8%~11.0%.干湿循环和碳化作用对CASC的海水侵蚀均有加速作用, 干湿循环促进盐析现象的产生, 加快混凝土的破坏.因此, 干湿-碳化耦合作用加速CASC的破坏.

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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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