激发剂种类对碱矿渣胶凝材料性能的影响研究

Studies on the Influence of the Properties of Alkali-activated Slag Cementitious Materials with Different Activator Types

为了研究激发剂种类对碱矿渣胶凝材料性能的影响规律,用高炉矿渣作为胶凝材料,氢氧化钠溶液、水玻璃溶液及碳酸钠溶液作为激发剂,在水胶比为0.3、碱当量为4%的条件下,研究3种激发剂对矿渣胶凝材料激发效果的影响,并采用微观测试手段分析了碱矿渣胶凝材料的微观形貌和水化产物.结果表明:不同的激发剂对胶凝材料的性能产生不同的影响,具体表现为碳酸钠作为激发剂,其凝结时间最长,且远远大于氢氧化钠和水玻璃作为激发剂制备的胶凝材料,但其制备的胶凝材料收缩率最小;水玻璃作为激发剂时,能够获得较高的强度,但其收缩率最大;而氢氧化钠作为激发剂,其制备的胶凝材料早期强度较高,但后期强度发展缓慢.微观分析显示,水玻璃和氢氧化钠作为激发剂时,水化产物主要为C-S-H凝胶和CaCO_(3),而碳酸钠作为激发剂时,水化产物主要为CaCO_(3).

In order to study on the influence of the properties of alkali-activated slag cementitious materials with different activator types,using blast furnace slag as cementing material,sodium hydroxide solution and sodium silicate solution as exciting agent,and sodium carbonate solution in water/cement ratio is 0.3,equivalent to 4%of the alkali conditions,three kinds of exciting agent excitation effects on slag cement materials were studied,and the microstructure and hydration products of alkali slag cement materials were analyzed by microscopic test means.The results showed that different initiators had different effects on the properties of the cementitious materials.Specifically,the setting time of sodium carbonate as the initiator was the longest,which was much longer than that of sodium hydroxide and sodium silicate as the initiator.When sodium silicate is used as an activator,it can obtain higher strength,but its shrinkage rate is the highest.As an initiator,the cementitious material prepared by sodium hydroxide had higher strength in the early stage,but the later stage of strength development is slow.Microanalysis shows that when sodium silicate and sodium hydroxide are used as the initiator,the hydration products are mainly C-S-H gel and CaCO_(3),while when sodium carbonate is used as the initiator,the hydration products are mainly CaCO_(3).