Blast Mitigation of structures using a Polyurea/Kevlar

composite.High Heat & Pressure Spray

Application

Explosive blast causes:

• Industrial Accidents.

• Severe weather incidents.

Industrial Accidents.

Severe weather incidents.

Polyurea/Kevlar composite.

• Polyurea is a two-component spray applied polymer that cures in seconds!

• Ballistic-grade Kevlar is a woven sheet that can withstand debris impact.

• Polyaspartic polyurea is a low viscosity liquid that “wets-out” the Kevlar, and bonds to the spray applied polyurea forming a composite.

A Polyurea spray application.

Ballistic grade, woven Kevlar.

Close-up of ballistic weave.

Testing the composite .

Government test site in New Mexico.

CMU block wall is primed.

First 1/8 inch layer of polyurea is white.

Laying up the Kevlar.

Second 1/8 inch layer of polyurea is gray.

Finished wall retrofit.

Blast charge is 220 # TNT.

Instrument configuration.

Before blast.

Post test. Control wall is gone.

Close-up of control wall.

Close-up of retrofitted wall.

Instrumentation results.

• Incidental pressure sensors.

• Reflected pressure sensors.

• High-speed video cameras.

• Wall deflection gauge.

Summary of test results.

• Control wall completely failed.• Outside surface of retrofitted wall failed.• All wall debris remained outside test room

of blast structure.• Polyurea/Kevlar had no tears, rips or

delamination from inside of wall.• Maximum peak wall deflection of 9.2

inches into test room, then rebounded back to a slight concave out of structure.