摘要
研究了矿物掺合料对混凝土钢筋保护性能的影响。结果显示,单掺矿粉、粉煤灰与矿粉复掺均能改善混凝土的钢筋保护性能。粉煤灰和矿粉复掺时,改善混凝土钢筋保护性能效果最为显著,复掺总量为20%时,比基准混凝土钢筋锈蚀率减少了24.37%。通过对各配合比混凝土试样进行压汞试验和Sirion场发射扫描电镜实验观察混凝土表面形貌特征发现,粉煤灰与矿粉复掺使胶凝材料水化完全,混凝土表面较为致密,从而大大提高了混凝土对钢筋的保护性能。
The influence of mineral admixtures on the property of concrete protecting steel bar against corrosion is studied. The results show that the slag powder and combined mixture of fly ash and slag powder can improve the property of concrete protecting steel bar against corrosion. The effect is particularly significant when the dosage ratio of combined mixture of fly ash and slag powder is 20%, and the concrete reinforcement corrosion rate decreases by 24.37% compared with the one not mixed admixtures. Through the mercury？test and sirion field emission scanning electron microscopy experiments to observe the microstructure of the concrete, it is found that the hydration of cementitious materials is more complete mixed with fly ash and slag powder, concrete surface is denser, the pore ratio is significantly reduced, which greatly improve the property of concrete protecting steel bar against corrosion.
出处
《混凝土与水泥制品》
北大核心
2012年第8期1-4,共4页
China Concrete and Cement Products
基金
铁道部科技计划重点项目(沪杭客运专线特大桥主梁混凝土收缩徐变控制与耐久性提升技术研究
2010g004-h)
关键词
混凝土
矿粉
复掺
钢筋锈蚀
压汞
扫描电镜
Concrete
Slag powder
Combined mixture
Steel bar corrosion
Mercury
Scanning electron microscopy （SEM）
