Experimental Study of Squeeze Behavior for a Kind of New Lightweight Foamed Concrete
一种新型轻质泡沫混凝土挤入行为的试验研究

Lightweight foamed concrete is a kind of new and important runway arresting material for airplanes and other vehicles. To understand its squeeze property, CSS4410 electric universal testing machine and Dynatup9250 drop-hammer testing machine were used. At different squeeze speed ranging from 2×10-5m/s to 7.8m/s, its squeeze mechanic characteristics, failure mode, deceleration property and anti-squeeze strength model were systematically studied respectively for lightweight foamed concrete with different relative densities. Results show that the anti-squeeze resistance of this material increases with squeeze speed and material relative density increase; material squeeze is a process of brittle material crushing/ solidification boundary moving in elastic region; crushing/ solidification volume during squeeze increases with squeeze depth increasing and its head shape becomes more sharp; anti-squeeze deceleration of this material has second power relationship with material relative density. So in order to ensure the safety of crew members, passenger and airplane, lower relative density lightweight foamed concrete should be adopted as far as possible.