Abstract
To enhance the stabilization effect of microorganisms and metakaolin on red-bedded mudstone filler, an innovative approach was introduced by implementing a synergistic stabilization technology combining microorganisms and geopolymers. The performance of the proposed approach was evaluated using physical, mechanical, and microstructural properties. Under the synergistic stabilization effect of microbial-geopolymer, the presence of cementitious materials increased by 60.80 percent, and longitudinal velocity increased by 6.63 %. furthermore, the surface porosity decreased by 20.52–23.49 %, the unconfined compressive strength increased by 250.00 % (i.e., 1.26 MPa), and the level of disintegration improved from Garde I (strong) to Grade Ⅳ (no disintegration). The synergistic effect of microorganisms and geopolymer ultimately formed a composite cementing structure of calcium carbonate, hydration products, and polymers, effectively enhancing the density and bonding strength between soil particles. The findings of this paper can guide the stabilization of red-bedded mudstone filler in high-speed railway foundation construction.
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