Flashcards in Chapter 11 Deck (14):

1

## What explosive effect do concrete breaching charges create?

### spalling

2

## What formula do you use on rebar reinforcement?

### P = D

3

## What are the rounding rules for breaching radius?

### External: Round Breaching Radius up to the nearest 1/2 foot. Internal: Find 1/2 the breaching radius then Round breaching radius up to the nearest 1/4 foot.

4

## What kind of target is a counter force charge effective against?

### Rectangular masonry or concrete columns 4' FT thick or less.

5

## When using a counterforce charge what must the target have?

### At least 3 faces or be freestanding

6

## How should you place counterforce charges?

### Diametrically opposed

7

## What does a counterforce charge rely on in order to destroy the target?

### shockwave collision

8

## What should you do with the breaching radius measurement for a counterforce charge?

### Round breaching radius up to the nearest 1/2 FT (its an external charge)

9

## What are the critical factors?

### size, shape, placememt, tamping

10

## What are the Charge thickness'es (breaching)?

### 0 LB - 4.99 LB (1"inch) 5 LB - 39.99 LB (2"inch) 40 LB - 299 LB (4"inch) 300 LB (8"inch)

11

## What is the breaching formula?

### P = R3KC

12

## What is the formula for number of charges?

### N = W / 2R

13

## Number of charges formula rules?

### N < 1.25 use 1 charge. N > 1.25 but < 2.5 use 2 charges. N = to or > 2.5 round off

14