掺粉煤灰和硅粉的C90高强度自流平混凝土研究

STUDY ON C90 HIGH STRENGTH AND SELF-LEVELING CONCRETE WITH FLYASH AND SILICA FUME

研究了内掺粉煤灰和硅粉对自流平混凝土强度和流动性的影响 ;根据试验数据总结出高强度自流平混凝土的强度经验公式 ;分析了掺粉煤灰和硅粉的高强度自流平混凝土后期强度增长规律 ;采用 4 2 5普通硅酸盐水泥、中砂、5～ 2 5mm碎石 ,水胶比 0 2 6 7～ 0 2 85 ,内掺 10 %粉煤灰和 10 %～ 15 %硅粉 ,或水胶比0 2 6 6 ,内掺 2 0 %粉煤灰和 15 %硅粉 ,掺加适量的NF 2 6缓凝高效减水剂 ,能配制出C90高强度自流平混凝土。

It was studied that the effect of addition of fly ash and silica fume on self-leveling concrete strength and fluidity; according to the experimental data obtained, the strength empirical equation of high stren gth self-leveling concrete was summarized; it was also analyzed that the later strength increasing rule of high strength self-leveling concrete with flyash an d silica fume; C90 high strength self-leveling concrete can be prepared. By gra de 42.5 ordinary Portland cement, medium sand, 5～25mm broken stone, water/ceme ntitious materials ratio 0.267～0.285, addition of 10% flyash and 10%～15% sil ica fume, or water/cementitious materials ratio 0.266,addition of 20% flyash and 1 5% silica fume, proper quantity of NF-2-6 retarding high effect water-reducin g agent.