Experimental study on the diffusion characteristics of polyurethane grout in a fracture

A Review of Research on the Effect of Temperature on the Properties of Polyurethane Foams

“…As early as the early 20th century, academician Wang Fuming of Zhengzhou University developed a complete set of technologies for the rapid inspection and repair of highways based on nondestructive testing and two-component foamed polyurethane foams grouting in combination with the structural characteristics and typical diseases of highways in China [ 21 , 22 ] and was widely used. In recent years, it has been widely used in water conservancy engineering grouting [ 23 , 24 ]. The compression [ 25 , 26 ], tensile [ 27 , 28 ], and shear properties [ 29 ] as well as the strain rate effect [ 27 ] and fracture properties [ 30 ] of polyurethane foams at different densities have been studied, laying the foundation for the study of the mechanical properties of polyurethane foams.…”

Preparation and Performance of Water-Active Polyurethane Grouting Material in Engineering: A Review

“…The experiment and simulation calculation of fracture grouting were applied to study the diffusion form of polyurethane in anhydrous rock. It was found that the polyurethane grout diffused concentrically, and the diffusion rate decreased continuously [ 45 , 46 ]. The diffusion form and range of polyurethane grout directly affect the strength of polyurethane foam after molding.…”

“…In the application of practical engineering, polyurethane grout was used in a complex service environment. The diffusion behavior of polyurethane grouting in water-bearing cracks was affected by groundwater pressure and groundwater temperature [ 45 ]. The research object of grout diffusion under the influence of dynamic water was constant density grout in several studies [ 47 , 48 , 49 , 50 , 51 ].…”

“…It was found that polyurethane diffused approximately circularly in the center of the grouting hole in fissure water with this test device ( Figure 4 ). The diffusion radius decreased with an increase in the water pressure when the grouting amount was constant [ 45 ]. Zhang [ 54 ] used a concrete slab to simulate dam cracks for a water penetration model test and established the relationship between grouting pressure, fracture characteristics and slurry diffusion radius.…”

“…( b ) The shape of grout diffusion for 10 s. ( c ) The shape of grout diffusion for 20 s. ( d ) The shape of grout diffusion for 30 s. Scale bar is 0.1 cm. Reproduced from [ 45 ], with permission from Elsevier, 2021.…”