Abstract
As a new antiseepage reinforcement material, polyurethane grouting material has been widely studied in terms of its static mechanical properties. However, research on its dynamic mechanical properties is relatively rare. In this research, considering the influence of the explosive charge weight, the air contact and close-in explosion experiments of polymer slabs were carried out. The failure mode and damage spatial distribution characteristics of polymer slabs were explored. Pressure time history curve of air shock wave was obtained using an air shock wave tester. The influence of polymer slabs on the propagation of air explosion shock wave was compared and analyzed. The results show that, under the air contact explosion, the polymer slab mainly suffers local damage, while under close-in explosion, overall damage is the main damage mode. With the increase of the explosive charge weight, the failure mode of the polymer slab transits from surface crack and slight spalling to local and whole crushing.
Highlights
Polyurethane is mainly composed of isocyanate and polyol polymerization, which has a series of advantages [1], such as rapid and adjustable reaction, high expansion rate, impermeability and waterproofness, and no environmental pollution
It can be seen from the figure that, under the action of contact explosion, the polymer slab is mainly characterized by local punching, collapse, and spalling on bottom surface
The polymer in the damage area peels off. e reason is that, under the action of contact explosion, the high-pressure shock wave generated by explosion directly acts on the top surface of the polymer slab, and the generated compressive stress is higher than the dynamic compressive strength of the polymer
Summary
Polyurethane is mainly composed of isocyanate and polyol polymerization, which has a series of advantages [1], such as rapid and adjustable reaction, high expansion rate, impermeability and waterproofness, and no environmental pollution. It has outstanding effect on solving specific complex engineering disaster problems, such as improving the properties of soft soil and increasing its strength [2]. Researchers have carried out relevant investigations on the static properties of polymer, such as compressive strength and shear properties They have carried out research on its properties of high expansion and diffusion, strong permeability resistance, rapid curing, durability, and environmental protection [9]. Shi et al [10] explored the effect of temperature on the compressive strength and volume change of polyurethane grouting materials through uniaxial compression test; Li et al [1] carried out uniaxial compression test on polyurethane grouting materials to study the influence of density and size of polyurethane samples on compressive strength
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