摘要
By analyzing the mechanical properties, composition of hydrates, content of Ca（OH）： and microstructure of the complex binder of silica fume-Portland cement, which cured at constant low temperatures（＋5--10 ℃）, the effect of different low temperatures on hydration performance of the complex binder at the age of 3, 7 days and 14 days was researched. Experimental results show that hydration processes of the complex binder can be restricted by low temperature. Reducing the curing temperature could cause compressive strength and flexural strength of the complex binder to decrease significantly. The gradient difference between strength diminishes, content of Ca（OH）2 in hydrates reduces, and compactness of the microstructure weakens. Therefore mixing with silica fume can modify various performance indicators of the complex blinder, but reducing the curing temperature restricts the pozzolanic activity of silicon fume.
By analyzing the mechanical properties, composition of hydrates, content of Ca（OH）： and microstructure of the complex binder of silica fume-Portland cement, which cured at constant low temperatures（＋5--10 ℃）, the effect of different low temperatures on hydration performance of the complex binder at the age of 3, 7 days and 14 days was researched. Experimental results show that hydration processes of the complex binder can be restricted by low temperature. Reducing the curing temperature could cause compressive strength and flexural strength of the complex binder to decrease significantly. The gradient difference between strength diminishes, content of Ca（OH）2 in hydrates reduces, and compactness of the microstructure weakens. Therefore mixing with silica fume can modify various performance indicators of the complex blinder, but reducing the curing temperature restricts the pozzolanic activity of silicon fume.
基金
Funded by the National Natural Foundation of China(No.51072122)
