Journal of Jilin University(Engineering and Technology Edition) ›› 2026, Vol. 56 ›› Issue (7): 1915-1925.doi: 10.13229/j.cnki.jdxbgxb.20241343

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

Ying-li GAO1,2(),Wei-xiang LIU1,Jun-cai ZHU1,Zhang-huang ZHU2,Teng-fei CHEN2,Hao-yu XIONG2   

  1. 1.School of Transportation，Changsha University of Science & Technology，Changsha 410114，China
    2.Hunan Provincial Engineering Technology Research Center for Novel and Carbon Neutral Road Material，Changsha University of Science & Technology，Changsha 410114，China
  • Received:2024-11-23 Online:2026-07-01 Published:2026-08-12

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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 CO32- 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

CLC Number: 

  • TU526

Table 1

Chemical composition of raw materials"

材料CaOSiO2Al2O3SO3Fe2O3MgO
GGBS34.0034.2017.601.621.016.21
CS92.903.471.511.110.600.08

Table 2

Proportion of ternary activator"

No.CSNa2SiO3NaAlO2
110000
201000
300100
450050
550500
605050
7100/3100/3100/3

Fig.1

Design of ternary activator by simplex barycenter method"

Fig.2

Fluidity of AAS under ternary composite activated"

Fig.3

Setting time of AAS under ternary composite activated"

Fig.4

Compressive strength of AAS under ternary composite activated"

Fig.5

The best activator ratio of AAS in ternary composite activated"

Fig.6

FT-IR curve of AAS at 28 d age"

Fig.7

Deconvolution curve and relative area of Si-O band in FT-IR spectrum"

Fig.8

XRD phase analysis of AAS at 28 d age"

Fig.9

TG-DTG curve at 28 d age"

Fig.10

EDS images and element distribution results of No.7 specimen at 28 d age"

Table 3

Molar ratio of each element in the specimen"

元素物质的量比
No.1No.4No.5No.7
O56.355.357.456.4
C17.718.617.217.2
Ca11.510.19.510
Si76.577
Al3.94.53.84.5
Mg2.92.82.92.9
Na0.21.51.61.4

Fig.11

Schematic diagram of hydration process of slag activated by Na2SiO3/NaAlO2 combined with CS"

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