Properties of Geopolymer Grouting Material Considering Road Interlayer Hollowing Diseases

Abstract

Abstract: The shape of road interlayer hollowing diseases is relatively flat, and the consolidated body after grouting repair is prone to bending. Therefore, it is necessary to focus on improving the toughness and bending resistance of the grouting material. Currently, there is a lack of grouting repair material which target its disease characteristics. Therefore, slag and fly ash were used as the main raw materials, vinyl acetate-ethylene copolymer redispersible powder (VAE glue powder) was added to improve the brittleness and flexural strength of geopolymer grouting material, and conduct geopolymerization reaction under the excitation of water glass which modulus adjusted by NaOH. A new type of geopolymer grouting material was developed, and the influences of factors such as VAE glue powder content on the performance of geopolymer grouting material was explored. The experimental results show that the optimal mix ratio for the comprehensive performance of the new geopolymer grouting material is 40% slag powder, 60% fly ash, 2% VAE glue powder, 0.1% air entraining agent, 2% UEA expansive agent, 25% water glass, 1.6 water glass modulus and 0.35 water-cement ratio. The newly developed geopolymer grouting material increases to 10.8% in flexural strength and decreases to 17.4% in brittleness, making it suitable forroad interlayer hollowing diseases. The research conclusion has a certain promoting effect on promoting the development of road hidden disease repair technology and ensuring the long-term safety and stability of road operation.

Key words: grouting material, geopolymer, road rehabilitation, interlayer hollowing disease, VAE glue powder, flexural strength

CLC Number:

U414

ZHAO Honghao, LIU Xianming, LI Peng, ZHANG Wenliang, WANG Kai, DONG Kun, WANG Junjie, XU Yi. Properties of Geopolymer Grouting Material Considering Road Interlayer Hollowing Diseases[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4559-4571.

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