粉煤灰/硅灰对低标号混凝土性能的影响

Influence of fly ash /silica fume on the performance of low-grade concrete

研究了单掺粉煤灰、硅灰和双掺粉煤灰/硅灰对低标号混凝土的工作性、强度和干缩性的影响。结果表明,粉煤灰和硅灰能改善新拌低标号混凝土的工作性,硅灰使得低标号混凝土在短期内的干缩变化加大,造成早期裂缝,短期内双掺粉煤灰/硅灰能有效提高低标号混凝土的抗压强度。

The effects on the low-grade concrete workability,strength and shrinkage of single fly ash, double-doped silica fume fly ash/silica fume were studied,the results show that fly ash and silica fume can improve the workability of fresh low-grade concrete and silica fume can increasing changes of concrete shrinkage in short term,resulting in early cracks,double-doped fly ash/silica fume can effectively impro-ving the compressive strength of low-grade concrete in such a short term.