Study on compatibility of fresh cement paste mixed with modified coal gasification slag and superplasticizer
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摘要: 煤气化渣是一种富含铝硅酸盐矿物的煤化工固体废料，机械粉磨与化学激发改性后的煤气化渣可作为复合硅酸盐水泥的活性混合材使用，可以有效减少水泥建材生产制备过程中的碳足迹。为明确掺改性煤气化渣水泥新拌浆体的工作性能，本文通过研究煤气化渣-水泥复合浆体的流动度、ζ-电位和粒径分布，对煤气化渣-水泥二元体系与减水剂相容性进行了评价。结果表明：经二乙醇单异丙醇胺助磨改性后的煤气化渣是一种介孔材料，在掺量不超30 % 的情况下，具有较好的工作性；聚羧酸系减水剂对掺改性煤气化渣水泥新拌浆体的分散性和流动性有利，且表现出修正Bingham流体特征。实验结论对研究煤气化渣-水泥二元体系的工作性能以及与减水剂的相容性有较高的理论参考价值。Abstract: Coal gasification slag is a kind of solid coal chemical waste which mainly contains aluminosilicate minerals.The gasification slag modified by mechanical grinding and chemical excitation can be used as active admixture of composite Portland cement, which can effectively reduce the carbon footprint in the production and preparation of cement building materials.In order to clarify the working performance of modified gasification slag cement fresh paste, the compatibility of gasification slag-cement binary system with superplasticizer was evaluated by studying the fluidity, ζ-potential and particle size distribution of gasification slag-cement composite paste.The results show that the coal gas slag modified by diethyl alcohol monoisopropanolamine is a kind of mesoporous material, and it has good workability when the content is not more than 30 %.Polycarboxylic acid superplasticizer is beneficial to the dispersibility and fluidity of modified gas slag cement paste, and the fresh coal gas slag cement paste mixed with polycarboxylic acid superplasticizer shows modified Bingham fluid characteristics.The experimental results have high theoretical reference value for studying the workability of gas slag-cement binary system and its compatibility with superplasticizer.
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Key words:
- gasification slag /
- cement paste /
- superplasticizer /
- workability /
- compatibility /
- carbon footprint
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图 3 水泥及改性煤气化渣粉体粒径分布
Figure 3. Particle size distribution of cement and modified coal gasification slag powder
图 4 不同改性煤气化渣粉体的吸脱附等温曲线
Figure 4. Adsorption and desorption isotherms of different modified coal gasification slag powders
图 5 不同改性煤气化渣粉体的孔径分布曲线
Figure 5. Pore size distribution curve of different modified gasification slag powder
图 6 不同改性煤气化渣的各龄期抗压强度与活性指数
Figure 6. Compressive strength and active index of different ages of different modified gasification slags
图 7 改性煤气化渣掺量对水泥新拌浆体流动度的影响
Figure 7. Effect of modified gasification slag content on fluidity of fresh cement paste
图 8 减水剂掺量对水泥新拌浆体流动度的影响
Figure 8. Effect of the amount of superplasticizer on the fluidity of fresh cement paste
图 9 改性煤气化渣掺量对水泥新拌浆体ζ-电位的影响
Figure 9. Effect of modified coal gas slag content on Zeta-potential of cement paste
图 10 减水剂掺量对水泥新拌浆体ζ-电位的影响
Figure 10. Effect of the amount of superplasticizer on Zeta-potential of fresh cement paste
图 11 改性煤气化渣掺量对水泥新拌浆体粒径分布的影响
Figure 11. Effect of modified gasification slag content on particle size distribution of cement paste
图 12 减水剂掺量对水泥新拌浆体粒径分布的影响
Figure 12. Effect of the amount of superplasticizer on particle size distribution of cement paste
图 13 不同掺量的煤气化渣-水泥浆体流变拟合曲线
Figure 13. Rheological fitting curve of gasification slag-cement paste with different contents
表 1 基准水泥熟料化学分析结果及矿物组成质量分数
Table 1. Results of chemical analysis and mineral composition of benchmark cement clinker
组成 化学成分 矿物成分 SiO2 Al2O3 Fe2O3 CaO MgO SO3 R2O f-CaO C3S C2S C3A C4AF 质量分数/% 21.2 4.93 3.98 64.42 1.52 0.96 0.53 0.87 59.53 15.86 6.31 12.10 
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表 2 煤气化渣化学组成质量分数
Table 2. Results of chemical analysis of coal gasification slag
组成 SiO2 Al2O3 Fe2O3 CaO SO3 TiO2 K2O MgO Na2O P2O5 质量分数/% 48.398 30.792 8.016 6.147 2.563 1.304 1.043 0.579 0.489 0.179
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表 3 流变模型拟合结果
Table 3. Fitting results of rheological model
实验 编号 拟合结果 τ0/Pa η/Pa·s R2 Cement a τ=3.814 03+0.643 68γ 3.814 03 0.643 68 0.987 90%C+10%DGS b τ=1.620 04+0.320 47γ+0.001 39γ2 1.620 04 0.320 47 0.999 70%C+30%DGS c τ=3.664 43+0.305 39γ+0.001 29γ2 3.664 43 0.305 39 0.999 50%C+50%DGS d τ=4.318 48+0.190 07γ+0.001 24γ2 4.318 48 0.190 07 0.998
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