Study on water absorption and pore structure fractal characteristics of slag-based geopolymer
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摘要: 为了研究矿渣基地质聚合物多孔材料在不同孔隙率、孔径分布情况下的吸水性能及改善机理，以高炉矿渣、粉煤灰、水玻璃为主要原料，以过氧化氢为发泡剂进行矿渣基地质聚合物的吸水、释水性能实验，并结合图像分析软件和分形理论分析其微观形貌及孔结构分形特征。实验结果表明，随着发泡剂使用量的增加，多孔材料的孔隙率、最可几孔径和吸水率相应增大，而材料释去单位质量水所需时间和孔隙表面分形维数随之减少; 当发泡剂掺量为0.87 % 时，材料吸水率达到62 %，释去单位质量水仅需1.38 h，此时材料兼顾了吸水性能和释水性能。Abstract: To explore slag-based geopolymer porous material under the condition of different porosity, pore diameter distribution of performance and improve the mechanism of water absorption, the experiments on the water absorption, water release properties of the slag-bnsed geopolymer were Conducted, with blast furnace slag, fly ash, and sodium silicate as the main raw material, and hydrogen peroxide as foaming agent, Image analysis softwares and the fractal theory were adopted to analyze its microstructure and pore structure fractal characteristics.The results show that the porosity, maximum pore size and water absorption of the porous material increase with the increase of the foaming agent, while the time needed to release water per unit mass and fractal dimension of the pore surface decrease.When the dosage of foaming agent is 1.6 ml, the water absorption rate of the material reaches 62 %, and the time required to release water per unit mass is only 1.38 h.At this point, both water absorption and water release properties of the material are taken into account.
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Key words:
- porous materials /
- porosity /
- pore size distribution /
- image analysis /
- fractal theory /
- water absorption
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图 4 地质聚合物吸水率和释水时间与发泡剂用量关系
Figure 4. Relationship between water absorption and release time of geopolymer and amount of foaming agent
表 1 原材料主要化学成分
Table 1. Quality ratio of main chemical composition of raw materials
% 原材料 SiO2 Al2O3 Fe2O3 CaO TiO2 MgO 高炉矿渣 35.63 13.39 0.37 36.17 0.43 8.83 粉煤灰 54.46 15.84 10.16 9.26 0.94 1.95 石英砂 99.34 0.30 0.02 - - - 
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表 2 矿渣基地质聚合物多孔材料的原料配比
Table 2. Composition of raw materials of slag-based geopolymer porous materials
试样编号 高炉矿渣/g 粉煤灰/g 水玻璃/g SDS/g 石英砂/g 水/g 过氧化氢/% T1 65 35 50 0.6 5 35 0.50 T2 65 35 50 0.6 5 35 0.75 T3 65 35 50 0.6 5 35 1.0 T4 65 35 50 0.6 5 35 1.25 T5 65 35 50 0.6 5 35 1.50
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表 3 地质聚合物孔结构图像表征孔隙率数据
Table 3. Geological polymer pore structure image characterizes porosity data
% 试样编号 表征次数1 表征次数2 平均孔隙率 T1 79.6 81.3 80.45 T2 83.3 81.5 82.40 T3 82.6 83.2 82.90 T4 83.7 84.2 83.95 T5 96.3 84.9 85.60
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表 4 试样孔隙表面分形维数计算结果
Table 4. Calculation results of fractal dimension of sample pore surface
试样编号 计盒维数 相关系数 最大误差/% 吸水率/% T1 1.79 1 1.2 36.1 T2 1.77 1 0.7 52.7 T3 1.75 1 1.5 73.6 T4 1.74 1 1.3 96.3 T5 1.73 1 1.6 111.6
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