Strength for Modified Polyurethane with Modified Sand

The Polyurethane grout is an effective method used for improving the soils stabilization without disturbing the original soil structure, which is workable for construction and enhances the performance of soil compressive strength. In order to study the effect temperature, acetone rate, sodium silicate rate, mass fractal dimension of particle, and particle shape on the compressive strength. In order to lighten the workload considerably, the central composite design under response surface methodology was utilized. In this study, different content percentages of PU were injected into the modified sand and the compressive strength of specimens from the modified sand injected was determined by conducting the unconfined compression test. The results indicated that the existence of temperature, beyond which the strength has no change with the increase of temperature. And the strength of specimen increases with the increase of acetone mass ratio, over a critical value, it decreases. And that the strength of the specimen increases with sodium silicate ratio until a critical value (6%), beyond which it decreases slightly. And also the comprehensive strength of specimen is well correlated to the fractal dimension and shape of particles.