Research on the preparation and performance of water-resistant and high-flexible polyurethane grouting materials for bridge deck grouting treatment
MU Jianqing
LYU Weihong
WANG Nan
LI Lubin
SHANGGUAN Boqi
Abstract：For the cracking and bleeding problems on the bridge deck grouting of expressways,a water-resistant and highly flexible polyurethane grouting material was developed.Through indoor experiments,the main influencing factors on performance were optimized.When the mass ratio of sodium silicate to the composite polyol is 80∶20,the content of the toughening agent is 10%,the mass ratio of MDI to pre-PU is 60∶40,and the diluent content is 20%,the water-resistant and highly flexible polyurethane has the best performance,with a tensile strength of 3.9 MPa,an elongation of 139%,a compressive strength of 7.4 MPa,and a flexural tensile strength of 5.4 MPa.Comparison results show that the two-component hydrophobic polyurethane is sensitive to water,expands when exposed to water,and its performance deteriorates.The two-component micro-expanding and water-resistant highly flexible polyurethane are not sensitive to water and have good durability in humid environments.However,the two-component micro-expanding polyurethane has almost no flexibility.
Keywords：bridge deck groutinggrouting materialwater resistanceflexibility
Publication Date：2026-01-25
Online Publishing Date：2026-03-17(First online date of this platform, not the publication date of the document)
Pages：5( 11-15 )