Na2SiO3/NaAlO2协同电石渣激发矿渣的增强机理

doi:10.13229/j.cnki.jdxbgxb.20241343

摘要/Abstract

摘要：

为解决工业固废电石渣制备碱激发矿渣胶凝材料时出现的强度低等问题，采用单纯形重心设计法探究硅酸钠/偏铝酸钠协同电石渣激发矿渣时流动度、凝结时间和抗压强度的变化规律，分析其增强机理。结果表明，优化后的激发剂最佳配比是硅酸钠含量为39%~59%，偏铝酸钠含量为5%~25%，电石渣含量大于26%且不超过47%。硅酸钠和偏铝酸钠均能增强体系碱度，加速硅铝质组分溶解，促进C-（A）-S-H等水化产物的生成。偏铝酸钠水解时的双重效应会加速铝氧四面体聚合，提高基体的早期强度；硅酸钠为体系提供了充足的硅氧四面体，保证了后期强度的持续发展；电石渣中的Ca²⁺与溶液中的CO₃^2-和［Al（OH）₄］^-结合形成了碳酸钙和水化碳铝酸钙，使结构更加密实。硅酸钠/偏铝酸钠协同电石渣激发矿渣时体系活性较高，力学强度和工作性能较好，微观结构也趋于凝胶化和致密化。

关键词: 道路工程, 单纯形重心设计法, 硅酸钠?偏铝酸钠?电石渣, 碱激发矿渣, 增强机理

Abstract:

In order to solve the problem of low strength in the preparation of alkali-activated slag cementitious materials from industrial solid waste carbide slag， this study used the simplex center of gravity design method to explore the changes of fluidity， setting time and compressive strength when sodium silicate/sodium metaaluminate cooperated with carbide slag to activate slag， and analyzed its enhancement mechanism. The results show that the optimum ratio of the optimized activator is that the content of sodium silicate is 39%~59%， the content of sodium aluminate is 5%~25%， and the content of carbide slag is more than 26% and less than 47%. Both sodium silicate and sodium aluminate can enhance the alkalinity of the system， accelerate the dissolution of aluminosilicate components， and promote the formation of hydration products such as C-（A）-S-H. The double effect of sodium aluminate hydrolysis will accelerate the polymerization of aluminum oxide tetrahedron and improve the early strength of the matrix. Sodium silicate provides sufficient silicon oxygen tetrahedron for the system， which ensures the sustainable development of the later strength. After the hydrolysis of carbide slag， it combines with CO₃^2- and ［Al（OH）₄］^- in the solution to form calcium carbonate and hydrated calcium carbonate， which makes the structure more dense. When sodium silicate/sodium aluminate cooperates with carbide slag to activate slag， the system has higher activity， better mechanical strength and working performance， and the microstructure tends to be gelled and densified.

Key words: road engineering, simplex center of gravity design method, sodium silicate-sodium aluminate-carbide slag, alkali-activated slag, strengthening mechanism

中图分类号:

TU526

高英力,刘伟祥,朱俊材,祝张煌,陈腾飞,熊浩宇. Na₂SiO₃/NaAlO₂协同电石渣激发矿渣的增强机理[J]. 吉林大学学报(工学版), 2026, 56(7): 1915-1925.

Ying-li GAO,Wei-xiang LIU,Jun-cai ZHU,Zhang-huang ZHU,Teng-fei CHEN,Hao-yu XIONG. Strengthening mechanism of Na₂SiO₃/NaAlO₂ synergistic carbide slag to activate slag[J]. Journal of Jilin University(Engineering and Technology Edition), 2026, 56(7): 1915-1925.

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材料	CaO	SiO₂	Al₂O₃	SO₃	Fe₂O₃	MgO
GGBS	34.00	34.20	17.60	1.62	1.01	6.21
CS	92.90	3.47	1.51	1.11	0.60	0.08

元素	物质的量比
元素	No.1	No.4	No.5	No.7
O	56.3	55.3	57.4	56.4
C	17.7	18.6	17.2	17.2
Ca	11.5	10.1	9.5	10
Si	7	6.5	7	7
Al	3.9	4.5	3.8	4.5
Mg	2.9	2.8	2.9	2.9
Na	0.2	1.5	1.6	1.4

Na₂SiO₃/NaAlO₂协同电石渣激发矿渣的增强机理

Strengthening mechanism of Na₂SiO₃/NaAlO₂ synergistic carbide slag to activate slag

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No.	CS	Na₂SiO₃	NaAlO₂
1	100	0	0
2	0	100	0
3	0	0	100
4	50	0	50
5	50	50	0
6	0	50	50
7	100/3	100/3	100/3