The phenomenon of adding appropriate silicon metal powder to concrete
Introduction: silicon metal powder in concrete will play a filling material and volcanic ash material effect. According to the proportion of fill in the right amount of silicon powder, have abundant, fill in the space between cement particles, make the slurry more close, silicon metal powder ash activity index of up to 110, a useful alternative coefficient for 3-4, the dragon is generated after the cement hydration of Ca (OH) 2 has the strong absorbability, constitute the outstanding development of silicon metal powder calcium acid gel, Greatly improve the strength of concrete.
1, adding strength: when the incorporation amount is 5-10%, concrete compressive strength can be improved by 10-50%, flexural strength improved by more than 10%.
2. Add fine density: when 10% is added, the impermeability improves 5-8 times, and the carbonization resistance can improve more than 4 times.
3. Add frost resistance: the relative dynamic elastic modulus of concrete mixed with 10% silicon metal powder decreases by 1-2% after 300-500 cycles of freezing and thawing, while the relative dynamic elastic modulus of general concrete decreases by 36-73% after 25-50 cycles.
4. Adding early strength: the compressive strength of R1 and R3 in the control group improved by 30% and 40-50% respectively.
5, add anti wear, anti cavitation erosion: metal silica powder concrete than general concrete anti wear to progress 0.5-2.5 times, anti cavitation erosion to progress 3-16 times. Is the hydropower station, reservoir, dam for anti-wear repair and protection of the best information. However, although the early relative strength development of silica fume concrete is slower than that of pure cement concrete at the same water-binder ratio, the absolute strength of silica fume concrete is higher than that of pure cement concrete because the strength of silica fume concrete is greatly increased by adding silica fume. On the other hand, experience has shown that the early strength development of HPC is faster than that of NSC. Although the setting time of HPC may be slightly delayed, the hydration of HPC after setting is greatly accelerated due to the efficient water reducer and silica powder. The result is usually a very rapid development of strength after condensation.
