THE DEVELOPMENT OF CERAMIC FOAM SPHERICAL SHELL WITH HIGH VISCOELASTIC ASPHALT HOT PRESSING COMPOSITE PLATE AND RESEARCH ON ANTIKNOCK PERFORMANCE TEST

In multi-layer protective covers, a sand dispersion layer has low antiknock performance, and is prone to harden after water absorption. For this reason, a ceramic foam spherical shell and a high adhesion asphalt hot-pressing composite plate were developed, which can be used to a dispersion layer. The antiknock performance of this composite plate was studied through a group charge blasting experiment. Results show that: the composite plate has excellent antiknock performance; the ground shock attenuation coefficient of the composite plate is from 4.15 to 4.2, and it is far greater than the coefficient of sand (1.5 to 3.5). The composite plate has multiples shock wave attenuation mechanism, including viscoelastic intrinsic attenuation, foam material crushing energy dissipation, hole diffraction effect caused by damping, and interface damping attenuation. At the same time, the composite plate also has advantages in the aspect of waterproof and environment adaptability in underground engineering.