Improving the Anti-washout Property of Acrylate Grouting Material by Bentonite: Its Characterization, Improving Mechanism, and Practical Application

Acrylate is a popular polymer grouting material that has been widely used to control groundwater seepage. However, the vulnerability of acrylate slurry dynamic water washout restricts its application in environments characterized by high flow velocity and pressures. In this paper, lithium bentonite (Li-B) was modify traditional magnesium (AC) material. The influence Li-B AC ratios on modified materials’ resistance explored, modification mechanism analyzed using X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM). Finally, anti-washout ability verified through engineering applications. Results revealed LiB-AC grout had adjustable setting times (10.5 395.6 s), minimal bleeding (0.1%), higher viscosity (65 mPa·s) expansibility (350%), stronger anti-water dispersibility (24 pure slurry), mechanical strength (compressive 0.386 MPa, tensile 0.088 MPa), better impermeability (2.23 × 10−8 m/s). beneficial time, bleeding, viscosity, retention rate, impermeability, grout. it diminished At optimal content (20%), were highest. performance attributed formation more stable dense interlaced spatial network structure after Li-B. project metro shield tunnel segment achieved than cement-water glass slurry.