Cast Concrete Panel

Echo Cast.

The heaviest-duty Echo panel. A cast concrete panel with Echo Cast Technology, cast to any thickness. The 6–7 in. panel here was the test size. Field-validated against 75 lb TNT at 3 ft with no rear-face spall, the concrete fragments a blast throws off the back of a panel.

Above 100 PSI

The only Echo panel rated above 100 psi peak overpressure against live TNT.

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Live Blast Testing

Watch the blast. See the panel.

Echo Cast is tested with live explosives, not bench estimates. Below is archival blast-test footage of the cast mix, followed by a side-by-side field test: two identical 6-inch panels shot with 75 lb of TNT at 3 ft, one cast with Echo Cast Technology and one without.

Blast-test footage75 lb TNT at 5 ft, then the same panel design retested at 3 ft standoff. Archival footage of the same cast mix.

Same panel, with and without

Panel without Echo Cast Technology, post 75 lb TNT, with rear-face spall — Without Echo Cast Technology
75 lb TNT @ 3 ft
6 in. precast panel, 5,000 psi, without Echo Cast Technology. Measurable rear-face spall.

Identical panel with Echo Cast Technology, no rear-face spall after 75 lb TNT — With Echo Cast Technology
75 lb TNT @ 3 ft
Identical 6 in. panel with Echo Cast Technology. No rear-face spall.

Pressure–Time History

The blast load behind the test.

The pressure–time loading for the charge class in these tests: roughly 75 lb of TNT at close standoff. Peak overpressure spikes to 1,136 psi in under a millisecond, then decays almost as fast. The area under that spike, the impulse, is what the panel actually has to absorb.

Pressure–time curve for a 74.99 lb TNT charge at 3.5 ft standoff: peak overpressure 1,136 psi, 67.49 psi-msec impulse, 0.62 ms positive-phase duration — Charge characterization
74.99 lb TNT at 3.5 ft: a 1,136 psi peak overpressure that decays inside a millisecond for a 67.49 psi-msec impulse. That is the loading a cast panel takes without rear-face spall.

Fort Bragg Breach Charge

A cast cube against a military breach charge.

A 4×4×4 ft solid cast cube of the same Echo Cast mix design, tested at Fort Bragg against a shaped military breach charge in an earlier program. Damage was limited to the contact area of the charge. The body of the cube remained intact.

Soldiers placing a shaped breach charge against a cast concrete column — Step 1
Applying the breaching charge.
Standard military shaped charge placed against the cast specimen.

Conventional concrete cube fully destroyed by the breach charge — Control
Conventional cube.
Conventional concrete cube reduced to rubble by the same charge.

Echo Cast cube, same mix design, intact after the breach charge with damage limited to the contact area — With Echo Cast Technology
Damage only where the charge was placed.
The cube with Echo Cast Technology survived. Spalling was confined to the contact point of the explosive.

Archival stills of the same cast mix design from an earlier test program.

Spec Echo Cast to your threat.

Tell us the charge size, the standoff, and the site. An engineer will scope the panel and the rating for your project and reply within one business day.

Talk to engineering (800) 935-6796

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