高掺量粉煤灰对GFRC改性的可行性研究

FEASIBLE STUDY OF IMPROVEMENT OF GFRC’S PROPERTIES WITH HIGH CONTENT OF FLY ASH

采用 5 0℃恒温水浴加速老化的试验方法 (加速老化龄期分别为 3d、7d、14d、2 8d、6 0d和 90d) ,从宏观力学性能的角度研究了采用粉煤灰、纯硅酸盐水泥与耐碱玻纤复合取代低碱水泥与耐碱玻纤复合制备GFRC制品的可行性问题。研究结果表明 ,采用粉煤灰、纯硅酸盐水泥与耐碱玻纤复合的技术是可行的。根据粉煤灰试件的后期强度与试件老化后玻纤表面的形貌分析结果 ,粉煤灰的最佳掺量为 6 0 % ,粉煤灰掺量过高时 ,后期强度开始降低 ;粉煤灰掺量过低时 ,耐碱玻纤就存在化学腐蚀的可能。

Through an accelerated aging test in 50℃ hot water for 3,7,14,28,60 and 90 days,the feasibility of manufacturing GFRC,using the combination of a fly ash,portland cement and alkali resistance glass fiber (AR glass fiber) instead of that of a low alkali cement and AR glass fiber is studied.The experiment results reveal that it is feasible.According to the late strength of the specimens and AR glass fiber's SEM morphology of the specimens with the fly ash,the best content of the fly ash is 60%.If the content of the fly ash is too high,the late strength of specimens would decreases,if it is too low,the AR glass fiber would be eroded.