【摘要】 由养护90d硬化水泥浆体和不同灰砂比的水泥砂浆磨制再生水泥浆体粉和再生水泥砂浆粉,通过碱激发制得碱激发再生水泥砂浆粉胶凝材料,研究了原始水泥砂浆的灰砂比(c/s),激发剂种类以及矿渣粉取代再生水泥砂浆粉的含量对碱激发再生水泥砂浆粉胶凝材料强度、物相组成和显微结构的影响。结果表明,在碱的激发作用下,再生水泥砂浆粉中的水泥水化产物可以发生组成和结构重组,形成新的胶凝性产物。用水玻璃作为激发剂较用NaOH作为激发剂可以得到更好的激发效果,由原始砂浆灰砂比较高的砂浆粉制备的胶凝材料较灰砂比低的砂浆粉胶凝材料的强度更高,用部分矿渣粉代替水泥砂浆粉可以显著提高碱激发再生水泥砂浆粉胶凝材料的强度。更多还原

【Abstract】 Recycled hardened cement mortars with different cement/sand ratio(c/s)and cured for 90d were dried at 200℃ and ground to fine powders,and alkali activator was added to prepare alkali-activated recycled cement mortar powder cement(AARCMP).The Effect of the c/s of the original mortar,type of alkali activators,and the addition of slag powder on the mechanical strength and microstructure of AARCMP were studied.The results show that the hydration products of cement in the recycled cement paste can be activated by alkali to re-construct new cementitious substances.Water glass is more effective than NaOH to work as the activator.The recycled cement mortar which was originally prepared with higher c/s yielded higher strength than that with lower c/s,and the addition of slag powder can remarkably increase the mechanical strength of the materials.SEM observation revealed that there is great difference between the microstructures of the hardened paste of AARCMP and that of hardened ordinary cement paste.更多还原