关键词: 玻璃粉;纳米SiO2;水化机理;纳米改性;力学性能

Abstract: The hydration and hardened of glass powder cementitious materials containing nano-SiO2 were investigated by X-ray diffraction, scanning electron microscope and mechanical properties.The results show that nano-SiO2 can consume large amount of Ca(OH)2 due to its high pozzolanic activity, so that hydration of cement can be accelerated, the slow strength gain of glass powder cementitious materials at early age can be eliminated.Nano-SiO2 can promote early dissolution of cement and enhance alkalinity of complex system, which is in favor of internal energy-rich bond (Si-O, Al-O) broken within glass powder, improving early hydration degree of glass powder.With the addition of nano-SiO2, the slow strength gain of glass powder cementitious materials at early age can be eliminated as well.The micro-aggregate effect of nano-SiO2 can improve microstructure of glass powder cementitious materials and harden cement paste gets more dense.Nano-SiO2 can short setting time and enhance compressive strength of glass powder cementitious materials.An ultimate value may be found, it show that 5% nano-SiO2 is a best incorporation for mixture binder materials.

Key words: glass powder;nano-SiO2;hydration mechanism;nano-modification;mechanical property