含凝灰岩粉复合胶凝材料抗压强度发展规律

Compressive Strength Development of Complex Binder Containing Tuff Powder

对比研究了掺加粉煤灰和(或)凝灰岩粉的复合胶凝材料的抗压强度发展规律.结果表明:在水化初期,粉煤灰与凝灰岩均以物理填充作用影响复合胶凝材料抗压强度的发展;与粉煤灰相比,具有特殊形貌的凝灰岩颗粒所引起的形态效应和微集料效应在水化初期更为显著;同等条件下,凝灰岩粉比表面积越大,复合胶凝材料的抗压强度就越大;粉煤灰的火山灰活性在水化后期逐渐显现,从而使得掺加粉煤灰的复合胶凝材料抗压强度较掺加凝灰岩粉复合胶凝材料抗压强度有所减小;相较于粉煤灰,凝灰岩粉对于复合胶凝材料抗压强度的贡献更多体现在水化初期.

Compressive strength development of complex binders containing fly ash and（or） tuff powder were investigated. The results show that the physical filling effect of fly ash and tuff has a more intense in- fluence on the compressive strength development of complex binders at an early hydration age. Compared with fly ash, the tuff particles with special morphology has more significant morphology effect and micro- aggregate effect at the beginning of the hydration. Under the same other condition, the bigger the specific surface area of tuff powder, the greater the compressive strength of complex binders containing tuff pow- der. The gap is gradually narrowing between the complex binders containing fly ash and the complex bind- ers containing tuff powder due to the pozzolanic activity of fly ash occurs at the late hydration age. Com- pared with fly ash, the contribution of the tuff powder to the compressive strength of complex binders is given mostly in the early hydration age.