Journal of Shandong University(Engineering Science) ›› 2026, Vol. 56 ›› Issue (5): 92-101.doi: 10.6040/j.issn.1672-3961.0.2025.084

• Civil Engineering • Previous Articles    

Design and reaction mechanisms of blast furnace slag-carbide slag-desulfurization ash ternary solid waste cementitious material based on extreme vertices method

Chen Cong1, Wan Tiantao2, Shan Hongri1, Li Hui2,3, Zhang Yong4, Song Shuai2*, Ge Zhi2   

  1. Chen Cong1, Wan Tiantao2, Shan Hongri1, Li Hui2, 3, Zhang Yong4, Song Shuai2*, Ge Zhi2(1. Jiqing High-Speed Railway Company, Jinan 250108, Shandong, China;
    2. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China;
    3. Zhongke Zhiyan( Shandong )Technology Development Company, Linyi 277700, Shandong, China;
    4. China Railway Jinan Bureau Group Company, Jinan 250117, Shandong, China
  • Published:2026-10-19

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Abstract: To achieve efficient resource utilization of ground granulated blast-furnace slag(GGBS), carbide slag(CS), and desulfurization ash(DA), the mix proportions of a ternary solid waste-based cementitious material were designed and optimized using the extreme vertices method. The influence of raw material composition on the compressive strength was investigated. The hydration products and pore structure characteristics of the materials were characterized using X-ray diffraction, thermogravimetric analysis, and mercury intrusion porosimetry. It was indicated by the results that the optimal mix proportion of GGBS, CS, and DA was 70.0∶19.4∶10.6. A negative correlation with the compressive strength was exhibited by the GGBS content across all curing ages, while enhanced later-age strength was contributed by DA. The interaction between GGBS and DA showed the lowest contribution, whereas the CS-DA interaction demonstrated the highest contribution. Within the GGBS-CS-DA ternary system, CaSO3 from DA continuously reacted with GGBS in the alkaline environment provided by CS, forming ettringite and C—S—H gel. These hydration products densified the microstructure of the cementitious material through cementation and pore-filling effects, consequently improving its compressive strength.

Key words: solid waste-based cementitious materials, ground granulated blast-furnace slag, carbide slag, desulfurization ash, compressive strength, microstructure

CLC Number: 

  • TU526
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