Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (S1): 350-364.doi: 10.16285/j.rsm.2022.0737

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Static and dynamic mechanical properties of coarse-grained fillings stabilized with geopolymer binder

WANG Sheng-nian1, SU Jun1, GUO Shuang-feng1, GU Lei-lei2, CHEN Ze-wei1, ZHAO Kai1   

  1. 1. College of Transportation Science & Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816, China; 2. CCCC First Highway Engineering Bureau Co., Ltd., Beijing 100024, China
  • Received:2022-05-28 Accepted:2022-10-26 Online:2023-11-16 Published:2023-11-17
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41902282, 42330704, U1939209), the Science and Technology Planning Project of Jiangsu Province, China (BE2022605) and the Open Fund of State Key Laboratory of Frozen Soil Engineering, China (SKLFSE201809).

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Abstract: Geopolymer is characterized by high strength, denseness, low thermal conductivity, and resource conservation, and it meets the needs of coarse-grained fill improvement for high-speed railway roadbed engineering in terms of seismic safety and feasibility of resource acquisition. The unconfined compression strength tests of geopolymer-stabilized fine-grained fillings with different mixing ratios of metakaolin and alkali-activator and the dynamic triaxial tests of geopolymer-stabilized coarse-grained fillings with different rock block contents and confining pressures were carried out. The mixing ratio of raw material and alkali activator for composing metakaolin-based geopolymer and their optimum mixing ratio in fine-grained fillings were analyzed. The impacts of rock block content and confining pressure on the dynamic characteristics of the geopolymer-stabilized coarse-grained fillings were discussed. The results indicated that the optimum ratio of metakaolin and alkali activator for composing geopolymer was 2:1, and their optimum content in fine-grained fillings was 15%; the maximum dynamic shear modulus of geopolymer-stabilized coarse-grained fillings had an approximately linear relationship with the rock block content and a non-linear relationship with the confining pressure; when the shear strain was normalized, the dynamic shear modulus ratios of the geopolymer-stabilized coarse-grained fillings were distributed in a narrow band, while the damping ratio showed a relatively high dispersion in values. The results of this study can provide the design parameter basis for the application and popularization of geopolymer-stabilized coarse-grained fillings.

Key words: coarse-grained filling, geopolymer, optimum mixing ratio, dynamic shear modulus, damping ratio

CLC Number: 

  • TU 452
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