关键词: 碱激发;粉煤灰;矿渣;偏硅酸钠

Abstract: The mechanical properties , and working ability of cementing material obtained by alkaline activation on the basis of fly ash ( FA ) and blast furnace slag ( BFS ) and analyses the micro-structure and hydrated products of the paste with XRD and SEM were investigated .This paper also analyzes the hydration process by calorimetric method .The results show that for fly ash-slag system , when sodium silicate is used as the activator , if the Na2O content is 8％, the mortar show the highest compressive stress.The fluidity will be enhanced with the increase of the Na2O content, but the setting time and dry shrinkage will be reduced .The main hydration products are C-S-H gels, with the increase of alkali equivalent , the degree of reaction of fly ash and slag becomes larger , and the amount of gel in hydration product increases .

Key words: alkali activated;fly ash;blast furnace slag;meta-sodium silicate