Study on activity characteristics of modified coal gasification coarse slag and its hydration hardening properties of blended cement paste
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摘要: 煤气化技术的规模化应用产生了大量难处理的煤气化灰渣。作为一种富含硅铝酸盐矿物的煤气化灰渣，具备火山灰活性和较低的碳含量特征，可作为辅助性胶凝材料使用。为探讨不同改性效果下煤气化粗渣的活性特征及其对水泥水化硬化性能的影响机制，本文从宏观和微观上对掺有改性气化粗渣的复合水泥浆体的水化放热、抗压强度、水化产物组成与结构进行分析比较。结果表明：添加二乙醇单异丙醇胺(DEIPA)改性，可明显地提升气化粗渣的粉磨效率和潜在水化活性，有效减少水化诱导期的延长，降低气化粗渣掺加对水泥水化的缓凝效果；添加DEIPA的顺序对复合水泥的水化硬化特性影响不大。经化学和物理协同改性后的煤气化粗渣可以用于硅酸盐水泥的混合材和混凝土的掺合料，在适当掺量(10 %)下可提升复合水泥的力学性能。Abstract: The large-scale application of coal gasification technology produces a large amount of coal gasification slag that is difficult to handle. As a kind of coal gasification ash rich in aluminosilicate minerals, coal gasification coarse slag has the characteristics of pozzolanic activity and low carbon content, and can be used as supplementary cementitious material. In order to explore the activity characteristics of coal gasification coarse slag under different modification effects and its influence mechanism on the hydration and hardening performance of cement, this paper analyzed the hydration exotherm, compressive strength, composition and structure of hydration products of the blended cement paste mixed with modified gasification slag, which were compared from macroscopic and microscopic perspectives. The results show that the addition and modification of diethanol monoisopropanolamine (DEIPA) can significantly improve the grinding efficiency and potential hydration activity of gasification coarse slag, effectively reduce the extension of hydration induction period and reduce the retarding effect of gasification coarse slag on cement hydration. The addition order of DEIPA has little effect on the hydration hardening properties of blended cement. The coal gasification coarse slag modified by chemical and physical coordination can be used as the admixture of Portland cement and concrete, and the mechanical properties of blended cement can be improved under the appropriate dosage (10 %).
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图 2 两种改性气化粗渣的颗粒形貌
Figure 2. Particle morphology of different modified gasification slag
图 3 不同改性气化粗渣在不同浓度NaOH溶液中Si、Al的溶出量
Figure 3. Dissolution of Si and Al from different modified gasification slags in different concentrations of NaOH solution
图 5 气化粗渣-水泥复合胶凝材料水化放热速率和放热总量曲线
Figure 5. Hydration heat release rate and total heat release curve of gasification coarse slag-cement blended cementitious material
图 6 不同掺量改性气化粗渣-水泥各龄期抗压强度的变化规律
Figure 6. Variation of compressive strength of modified gasification slag-cement at different ages
图 7 气化粗渣-水泥复合胶凝材料3d和28 d水化产物XRD
Figure 7. 3 d, 28 d hydration product XRD of gasification slag-cement blended cementitious material
图 8 3 d和28 d气化粗渣-水泥复合胶凝材料硬化浆体的扫描电镜
Figure 8. SEM of hardened paste of 3 d, 28 d gasification slag-cement blended cementitious material
表 1 水泥与气化粗渣化学成分
Table 1. Chemical composition of cement and GS
% 材料 SiO2 Al2O3 Fe2O3 CaO MgO SO3 Loss 水泥 20.78 5.01 3.50 63.93 2.01 2.21 1.80 气化粗渣 52.52 16.70 11.58 8.67 2.00 3.12 3.6 
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表 2 两种改性气化粗渣和水泥的筛余量及比表面积
Table 2. Sieve residue and specific surface area of different modified gasification slag and cement
参数 水泥 GS DGS 筛余量(0.045 μm)/% 3.6 3.4 3.1 比表面积/(m2·kg-1) 377 412 445
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