Concrete Breaching

Question 1

what are the rounding rules for N (number of charges)

Answer 1

if its less than 1.25 use 1 charge

if it’s 1.25 but less than 2.5 use 2 charges

if it’s 2.5 or greater round off to the nearest whole number

Question 2

what formula do you not divide by RE

Answer 2

do not divide by RE for Counter force charges, they will always be plastic explosives

Question 3

what is the formula for counter force charges

Answer 3

P = 1.5BR

1.5 x Breaching radius

Question 4

what are the key points to counterforce

Answer 4

effective against rectangular masonry or concrete up to 4’ thick

uses shockwave collision

round up to the nearest 1/2’, its still an external charge

Question 5

what are some factors of breaching charges

Answer 5

size, shape, placement and tamping are key to success

size and confinement are most critical

will not cut through rebar, must use the P = D formula

Question 6

what is the formula for external and internal breaching charges

Answer 6

P = R cubed x k x c

R= Breaching radius

Question 7

how do you round breaching radius for external and internal charges

Answer 7

round up to the nearest 1/2’ for external

round up to nearest 1/4’ for internal

Question 8

what is the formula to determine number of charges

Answer 8

N = W/2R

width / radius x 2