Abstract: In view of the poor stability of aeolian sand slope and the problems such as difficult hole-forming and limited reinforcement in commonly used reinforcement technologies, the new sodium silicate-ester slurry with binary acid ester as curing agent is proposed to reinforce aeolian sand. The gel time and the time-varying behavior of viscosity of new sodium silicate-ester slurry are systematically tested by inverted cup method and rotational viscometer respectively. The influences of different slurry filling rates on the strength and permeability of grouted-sand are studied by triaxial test. The results show that the gel time is between 20 s and 60 min. The viscosity of the slurry increases exponentially with time and the viscosity is low before gelation. When the slurry filling rate increases from 0% to 100%, the cohesion of grouted-sand increases linearly from 0 kPa to 148.4 kPa, and the internal friction angle increases from 32.1° to 37.8° according to the parabolic law, and the permeability coefficient decreases from 3.42×10?5 cm/s to 8.74×10?7 cm/s. Comparing with sodium silicate-phosphoric acid slurry and sodium silicate-sulfuric acid slurry, the compressive strength of grouted-sand reinforced by new sodium silicate-ester slurry is higher. The research results of this paper provide a new method for the reinforcement of aeolian sand slope.

Key words: aeolian sand slope, new sodium silicate-ester slurry, gel time, time-varying behavior of viscosity, reinforcement effect