抑制矿物聚合材料泛霜行为的试验研究

Experimental Study on Inhibiting the Efflorescence Behavior of Geopolymer

将某低活性高硅尾矿作为硅铝原料先进行活化预处理,再与铝校正料(铝酸钠)复合,制备矿物聚合材料;提出抑制矿物聚合材料泛霜行为的两种方式,并对抑制效果进行研究,通过SEM、FTIR和XRD对相关机理进行分析。结果表明:对试样在一定温度下进行煅烧预处理后可提高其结构致密化程度,降低试样结构中过剩Na+的迁移速率;对试样进行蒸压养护后可促进矿物聚合反应的进一步进行,形成的更为稳定的三维网络结构可对过剩Na+进行更好地束缚;利用这两种方式都能达到有效抑制矿物聚合材料试样泛霜行为的目的。

A low-reactive and silica-rich tailing was pretreated for activation, and then it was used as SiAl source material for geopolymer synthesis in combination with the Al-correcting material （i. e. sodium aluminate）. Two methods for inhibiting the efflorescence behavior of geopolymer sample were proposed. The inhibitory effect was investigated, and the inhibitory mechanism was also analyzed by SEM, FTIR and XRD. The results showed that, by means of calcination pretreatment under a certain temperature, the compactness of the sample can be improved and thus the migration rate of the surplus Na＋ can be decreased; By means of autoclaved curing, the geopolymeric reaction can be further promoted, and thus the surplus Na ＋ can be better bound by the more stable three-dimensional network structure; The goal of effectively inhibiting the efflorescence behavior of geopolymer sample can be achieved by both of the two methods.