海水珊瑚砂粉工程水泥基复合材料高温暴露后的性能研究

doi:10.16552/j.cnki.issn1001-1625.2025.0955

摘要/Abstract

摘要：

为提升珊瑚资源在海洋高温环境下混凝土工程中的应用可靠性，本文研究了不同珊瑚砂粉（CSP）体积替代率（0%、25%、50%、100%）对海水珊瑚砂粉工程水泥基复合材料（SCECC）高温暴露后残余抗压强度、剥落行为及微观结构的影响。试验结果表明，25%体积替代率下SCECC在400 ℃以内仍保持较好的承载能力和结构完整性，而100%体积替代率时，由于碳酸钙分解和界面结构破坏，材料强度大幅衰减并出现延迟性剥落。扫描电子显微镜分析表明，适量CSP引入可优化界面过渡区结构，但在高温下热分解效应会破坏基体连续性。本研究明确了CSP在SCECC中的高温损伤机制与界面响应特征，为近海高温服役环境下工程水泥基复合材料的设计与评估提供了实验依据。

关键词: 工程水泥基复合材料（ECC）, 珊瑚砂粉, 高温暴露, 残余抗压强度, 剥落行为, 微观结构

Abstract:

To enhance the application reliability of coral resources in marine concrete structures under high-temperature environments， this study investigated the effects of different coral sand powder （CSP） volume replacement ratios （0%， 25%， 50%， and 100%） on the residual compressive strength， spalling behavior， and microstructure of seawater coral sand powder engineered cementitious composites （SCECC） after high-temperature exposure. The test results show that SCECC with a 25% CSP volume replacement ratio maintains good load-bearing capacity and structural integrity below 400 ℃， whereas at a 100% volume replacement ratio， significant strength degradation and delayed spalling occur due to calcium carbonate decomposition and interfacial structure damage. Scanning electron microscopy analysis indicates that an appropriate amount of CSP can optimize the interfacial transition zone structure， while thermal decomposition at high temperatures disrupts the matrix continuity. This study elucidates the high-temperature damage mechanisms and interfacial response characteristics of CSP in SCECC， providing experimental evidence for the design and evaluation of engineered cementitious composites serving in high-temperature marine environments.

Key words: engineered cementitious composites （ECC）, coral sand powder, high-temperature exposure, residual compressive strength, spalling behavior, microstructure

中图分类号:

TU528

洪川海, 梁瑞庆, 梁振升, 张伯涛, 唐雪梅, 阮国威, 林嘉祥. 海水珊瑚砂粉工程水泥基复合材料高温暴露后的性能研究[J]. 硅酸盐通报, 2026, 45(4): 1151-1159.

HONG Chuanhai, LIANG Ruiqing, LIANG Zhensheng, ZHANG Botao, TANG Xuemei, RUAN Guowei, LIN Jiaxiang. Properties of Seawater Coral Sand Powder Engineered Cementitious Composites after High-Temperature Exposure[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(4): 1151-1159.

图/表 14

表1 主要原材料的化学成分

Table 1 Chemical composition of main raw materials

Material	Mass fraction/%
Material	CaO	SiO₂	Al₂O₃	SO₃	Fe₂O₃	MgO	Other
PC	67.81	16.48	3.94	4.55	4.51	1.04	1.67
FA	4.01	54.00	31.20	2.20	4.16	1.01	3.42

表2 PE纤维的物理力学性能

Table 2 Physical and mechanical properties of PE fiber

Density/

（g·cm^-3）

Elongation/%

Melting

temperature/℃

Decomposition

temperature/℃

表3 人工海水的化合物浓度

Table 3 Compound concentrations of artificial seawater

Chemical composition	NaCl	MgCl₂·6H₂O	Na₂SO₄	CaCl₂	KCl	NaHCO₃	KBr	H₃BO₃
Concentration/（g·L^-1）	24.53	5.20	4.09	1.16	0.69	0.20	0.10	0.03

表4 SCECC组别和混合比例

Table 4 Groups and mix proportion of SCECC

Group	Mix proportion/（kg·m^-3）
Group	PC	FA	QP	CSP	ASW	HRWR	DF	PE fiber
R-0	600.0	600.0	432.0	0	348.0	3.6	1.8	19.4
R-25	600.0	600.0	324.0	113.0	348.0	3.6	1.8	19.4
R-50	600.0	600.0	216.0	226.0	348.0	3.6	1.8	19.4
R-100	600.0	600.0	0	453.0	348.0	3.6	1.8	19.4

图1 残余抗压强度测试加热曲线

Fig.1 Heating curves for residual compressive strength test

图2 剥落行为测试加热曲线

Fig.2 Heating curves for spalling behavior test

图3 不同温度下SCECC的残余抗压强度

Fig.3 Residual compressive strength of SCECC at different temperatures

图4 不同温度下SCECC的强度损失

Fig.4 Strength loss of SCECC at different temperatures

图5 从炉中取出试件的剥落表现

Fig.5 Spalling behavior of specimens after removal from furnace

图6 在自然环境中放置 14 d后试件的剥落表现

Fig.6 Spalling behavior of specimens after 14 d of natural exposure

图7 SCECC的质量损失

Fig.7 Mass loss of SCECC

图8 SCECC的吸水率

Fig.8 Water absorption rate of SCECC

图9 常温时骨料与基体间ITZ的EDS分析

Fig.9 EDS analysis of ITZ between aggregate and matrix in ambient temperature

图10 不同温度和CSP替代率下SCECC的微观形貌

Fig.10 Micro-morphology of SCECC with different CSP replacement ratios at different temperatures

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