- 目录
- 建筑石膏与胶凝材料
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粉煤灰地质聚合物多孔材料的制备及其性能研究
作者：曲阳威，韩凤兰，邢质冰，王亚光
（北方民族大学 材料科学与工程学院，宁夏 银川 750021）
摘要：以粉煤灰为主要原料，采用碱激发的方法制备地质聚合物多孔材料。研究碱激发剂、发泡剂和稳泡剂的用量对地质聚合物多孔材料体积密度和抗压强度的影响，并进行微观分析。试验结果表明，当碱激发剂用量为16.92%，发泡剂用量为1.23%，稳泡剂用量为0.46%时，样品性能最优，28 d抗压强度达到0.73 MPa，体积密度为0.46 g/cm3，且成孔分布相对均匀。SEM观察到粉煤灰的微观形貌发生变化，结合FTIR和XRD分析表明，在碱激发剂的作用下粉煤灰中的活性物质发生解聚-缩聚反应，生成N-A-S-H凝胶，结合抗压强度测试表明，此凝胶是增强地质聚合物多孔材料强度的主要来源。
关键词：粉煤灰；地质聚合物；多孔材料；碱激发；抗压强度
中图分类号：TU526 文献标识码：A 文章编号：1001-702X（2020）11-0144-04
Preparation and properties of fly ash geopolymer porous materials
QU Yangwei，HAN Fenglan，XING Zhibing，WANG Yaguang
（School of Materials Science and Engineering，North Minzu University，Yinchuan 750021，China）
Abstract：The porous materials of geopolymer were prepared by alkali excitation with fly ash as the main raw material. The effects of the dosage of alkali activator，foaming agent and foam stabilizer on the volume density and compressive strength of the porous materials of geopolymer were studied and analyzed. The test results showed that when the dosage of alkali activator was 16.92%，foaming agent was 1.23%，and foam stabilizer was 0.46%，the sample performance was the best，the compressive strength of 28 d reached 0.73 MPa，the volume density was 0.46 g/cm3，and the pore distribution was relatively uniform. SEM observed that the microstructure of fly ash changed，FTIR and XRD analysis show that the active substances in fly ash depolymerize and condense under the action of alkali activator to form N-A-S-H gel. Combined with compressive strength test，the gel is the main source to enhance the strength of geopolymer porous materials.
Key words：fly ash，geopolymer，porous material，alkali excitation，compressive strength