摘要
泡沫混凝土在海岸工程等领域有良好的应用效果。通过对不同配比下的泡沫混凝土进行干湿循环试验,利用力学试验和X射线衍射仪分别从宏观尺度和微观化学角度探究了不同环境干湿循环作用下泡沫混凝土力学性能演变特征和矿物成分变化特点,构建了泡沫混凝土在不同环境干湿循环作用下的力学性能退化模型;揭示了泡沫混凝土在海洋环境下所发生的化学作用和力学性能劣化机理。结果表明:泡沫混凝土在淡、海水干湿循环作用下抗压强度均呈整体下降的大致趋势,干湿循环150次后,抗压强度较初始的衰减值分别为12.6%~22.4%和15.7%~27.3%,在海水环境下抗压强度衰减比在淡水环境下大1.7%~4.9%;泡沫混凝土在淡水环境下将发生碳化作用,而在海水环境下将受碳化作用和盐类恶性化学侵蚀耦合叠加影响,致使结构成分损伤且强度衰减。
Foam concrete has good application potential in coastal engineering and other fields.Dry-wet cycle tests were conducted on foam concrete with different mix proportions.Mechanical tests and an X-ray diffractometer were used to investigate the mechanical properties of foam concrete and the changes in mineral composition under different dry-wet cycle conditions from macroscopic and microscopic perspectives.Degradation models for the mechanical properties of foam concrete under these conditions were established.The mechanism of chemical reactions and mechanical property deterioration of foam concrete in the marine environment was revealed.The results show that the compressive strength of foam concrete shows a general trend of overall decline under the dry-wet cycle of fresh water and seawater.After 150 dry-wet cycles,the attenuation values of compressive strength compared with the initial compressive strength are 12.6%-22.4%and 15.7%-27.3%,respectively.The attenuation of compressive strength in the seawater environment is 1.7%-4.9%greater than that in the freshwater environment.Carbonization of foam concrete occurs in the fresh water environment,and the combined effects of carbonization and harmful salt chemical erosion cause structural damage and strength loss in the seawater environment.
作者
廖宏志
牛飞
刘宇昊
LIAO Hongzhi;NIU Fei;LIU Yuhao(The Second Engineering Company of CCCC Fourth Harbor Engineering Co.Ltd.,Guangzhou 510230,China;CCCC Fourth Harbor Engineering Institute Co.Ltd.,Guangzhou 510230,China;CCCC Key Lab of Environmental Protection and Safety in Foundation Engineering of Transportation,Guangzhou 510230,China)
出处
《水道港口》
2025年第4期581-589,共9页
Journal of Waterway and Harbor
基金
国家重点研发计划项目(2022YFB2603000)。
关键词
泡沫混凝土
海水干湿循环
抗压强度
矿物成分
碳化
性能劣化
foam concrete
seawater dry and wet cycles
compressive strength
mineral composition
carbonation
performance degradation
