摘要
为更方便、高效、安全地激发煤矸石的活性,制造出满足建筑需要的地质聚合物,用氢氧化钠与碳酸钙混合制备的碱性干粉激发剂替代氢氧化钠,对煤矸石、粉煤灰和标准砂进行处理,研究影响干粉激发煤矸石地质聚合物性能的因素,并与传统碱性溶液激发聚合物的特性进行了对比。结果表明:(1)升高养护温度、提高干粉激发剂中氢氧化钠的用量会加快地质聚合物的凝结和硬化速度。(2)养护温度升高可使试件的吸水率和抗压强度上升。(3)干粉激发剂中碳酸钙用量的增加会使地质聚合物试件的吸水率上升、抗压强度下降。(4)干粉激发剂中氢氧化钠用量为3%时,地质聚合物试件的吸水率最低、抗压强度最高。(5)无论从吸水率的角度还是从抗压强度的角度看,干粉激发剂的激发效果均好于氢氧化钠溶液。因此,干粉激发剂比氢氧化钠溶液更适合于激发煤矸石制备煤矸石基地质聚合物。
For activating coal gangue in a more efficient and safer way to produce the qualified geopolymer for construction,alkaline dry powder activator made of sodium hydroxide and calcium carbonate powder is used to replace hydroxide solution to treat coal gangue,fly ash and sand. Factors affecting the characteristics of the geopolymer of coal gangue activated by alkaline dry powder were studied,which is contrasted with that of the traditional sodium hydroxide solution. The results showed that:(1)Elevating curing temperature and increasing the dosage of sodium hydroxide in dry powder accelerated the setting and hardening of the geopolymer.(2)Elevating curing temperature increased water absorption and compressive strength of the specimen.(3)The increase of calcium carbonate in dry powder raised water absorption rate and compressive strength of geopolymer specimen.(4)When sodium hydroxide amount in dry powder reached 3%,geopolymer specimen with lowest water absorption rate and highest compressive strength was obtained.(5) Whether from the viewpoints of water absorption rate or compressive strength,the effect of dry powder activator outperforms that of sodium hydroxide solution activator. Thus,dry powder activator is more suitable for preparing coal gangue-based geopolymer than sodium hydroxide solution activator.
出处
《金属矿山》
CAS
北大核心
2016年第11期193-196,共4页
Metal Mine
基金
"十二五"国家科技支撑计划项目(编号:2013BAB02B08)
国家自然科学基金重点项目(编号:50934006)
关键词
地质聚合物
碱性干粉激发剂
煤矸石
粉煤灰
养护温度
Geopolymer
Alkaline dry powder activator
Coal gangue
Fly ash
Curing temperature