海水干湿循环下玄武岩纤维增强珊瑚混凝土耐久性

测试了海水干湿循环下玄武岩纤维增强珊瑚混凝土(BFRCC)的质量和强度变化,并分析了基体的水化产物和微观结构,研究了BFRCC的耐久性。结果表明:随着侵蚀次数的增加,各BFRCC质量都逐渐增大,而抗压强度则呈现先增长后降低的趋势;同时在不同干湿循环次数下,掺入1%BF的BFRCC试样质量和强度变化幅度最小,这说明1%体积分数的BF可显著提高基体的耐久性;热重分析与扫描电镜分析得出,基体性能的变化主要是外界侵蚀离子在内部形成C-S-H、AFt和Ca(OH)₂等产物。

Durability of Basalt Fiber Reinforced Coral Concrete under Seawater and Drying-Wetting Cycles

Durability of basalt fiber reinforced coral concrete(BFRCC) is investigated by testing the change of mass and compressive strength and analysing the hydration products and microstructure of matrix under seawater and drying-wetting cycles. The results show that with increase of drying-wetting cycles, mass of all matrix increase and compressive strength increase first and then decrease. Simultaneously, the BFRCC smaple with 1%BF exhibites the smallest change in mass and strength under different drying-wetting cycles, indicating dosage of 1% BF can significantly improve the durability of the matrix. TGA and SEM analysis indicate that the changes of properties are attributed to the fact that erosion ion in seawater result in hydration products in internal matrix such as C-S-H, Aft and Ca(OH)2.