B03 Practical Exercise Breach Charges

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Concorde Career Colleges, Memphis *

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12BALC

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Civil Engineering

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Feb 20, 2024

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Course 052-12B30-C45 (DL) - Phase 1 - COMBAT ENGINEER ALC - FY24 Test PE - B03: Calculate Breaching Charge Practical Exercise Started 12/3/23 2:52 PM Submitted 12/3/23 2:59 PM Status Completed Attempt Score 170 out of 180 points Time Elapsed 7 minutes Instruction s Overall Scenario: Your team is set to conduct a mobility mission. On this mission, your unit comes across a set of obstacles blocking the unit from proceeding any further. To pass the obstacles, you must perform a number of breaching demolitions. Calculate Breaching Charge Overview: Correct calculation of breaching charges is essential to move friendly forces through obstacles without being engaged and to maintain momentum during assault or a retrograde. Failure to properly calculate for breaching charges can slow or stop an assault, cause unnecessary collateral damage, injure or kill Soldiers and civilians. Strict attention to calculating breaching charges will also aid in maintaining economy of resources. Steel Cutting Charge Calculation Activities:  Apply the six-step problem-solving format to calculate the size of charges required to breach concrete, masonry, rock, or similar material using the following formula: P = R 3 KC.  Use the hasty method to determine the amount of explosives required for breaching reinforced concrete.  Use the hasty method to determine the amount of explosives required for breaching materials other than reinforced concrete targets.  Use the six-step problem-solving format and the appropriate formula to calculate counterforce charges for rectangular masonry or concrete columns 4 feet thick or less. References:  TM 3-34.82, Explosives and Demolitions, 07 March 2016  GTA 05-10-033, Demolitions Card, 03 Jan 1994 Results Displayed Submitted Answers, Feedback, Incorrectly Answered Questions  Question 1 10 out of 10 points Activity 1 (Questions 1-5): Your unit has received a mission directive to calculate the charge necessary to breach a concrete wall. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Using the six step formula and the structured steel cutting formula (P = R ^ 3 KC), determine how many packages of TNT it would take to breach concrete, masonry, and rock. Task : Before beginning to calculate the breaching charges, you need to demonstrate your understanding of the six step charge calculation process. Put the steps in the proper order and then select Submit. o Questi on Selected Match Step 1 a. Determine critical dimensions

Response Feedback: Correct. Nice work, SSG. You correctly identified the six step charge calculation process.  Question 2 10 out of 10 points Activity 1 (Questions 1-5): Your unit has received a mission directive to calculate the charge necessary to breach a concrete wall. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Using the six step formula and the structured steel cutting formula (P = R ^ 3 KC), determine how many packages of TNT it would take to breach concrete, masonry, and rock. Task : The formula required to breach concrete, masonry, rock, or similar material is P = R 3 KC . What does each component of that formula stand for? o Questi on Selected Match P d. Required explosive in pounds R b. Breaching radius K c. Material factor C a. Tamping factor Response Feedback: Correct. Nice work, SSG. You correctly identified what each component of the breaching formula represents.  Question 3 0 out of 10 points Activity 1 (Questions 1-5): Your unit has received a mission directive to calculate the charge necessary to breach a concrete wall. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Using the six step formula and the structured steel cutting formula (P = R ^ 3 KC), determine how many packages of TNT it would take to breach concrete, masonry, and rock. Task : For concrete, masonry and rock breaches, the breaching radius depends on the location of the charge. Match each location with its corresponding breaching radius. o Question Selected Match external a. the longest distance from the center of the charge to the outside surfaces of the target internal, centered c. one-half the thickness of the target internal, less than centered b. equal to the thickness of the target being breached Response Feedback: Incorrect. The correct answer is now displayed. It is recommended that you review the concrete, masonry, and rock breaching radius information to reinforce your knowledge of this area.

 Question 4 10 out of 10 points Activity 1 (Questions 1-5): Your unit has received a mission directive to calculate the charge necessary to breach a concrete wall. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Using the six step formula and the structured steel cutting formula (P = R ^ 3 KC), determine how many packages of TNT it would take to breach concrete, masonry, and rock. Task : What is the formula to determine the number of charges for a concrete breaching calculation? Selected Answer: b. N = W/2R Response Feedback: Correct. Nice work, SSG. The formula to determine the number of charges for a concrete breaching calculation is N = W/2R.  Question 5 10 out of 10 points Activity 1 (Questions 1-5): Your unit has received a mission directive to calculate the charge necessary to breach a concrete wall. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Using the six step formula and the structured steel cutting formula (P = R ^ 3 KC), determine how many packages of TNT it would take to breach concrete, masonry, and rock. Task : Calculate the weight of a single charge required to destroy this good masonry wall using an elevated, untamped charge (C=1.8). Remember to round your response to the next whole number. Material R K Good masonry, concrete block, and rock 0.3m (1ft) or less Over 0.3m (1ft) to less than 0.9m (3ft) 0.9m (3ft) to less than 1.5m (5ft) 1.5m (5ft) to less than 2.1m (7ft) 2.1m (7ft) or more 0.88 0.48 0.40 0.32 0.27 _____ pound(s) of TNT Selected Answer: 24 9

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Response Feedback: Correct. Nice work, SSG. The weight of a single charge required to destroy this good masonry wall an elevated, untamped charge is 248.83 lbs. P = R 3 KC P = 8 3 x .27 x 1.8 P = 248.83, rounded up to 249 pounds of TNT  Question 6 10 out of 10 points Activity 2 (Questions 6-9): Your unit has received a mission directive to calculate the charge necessary to breach reinforced concrete. Calculate a charge to breach reinforced concrete charge calculations use a hasty calculation method. Task : Using the hasty method, calculate the amount of C4 (M112) required to destroy a reinforced concrete falling block obstacle 8' square and 20' wide, using and elevated, untamped charge. Reinforced concrete thickness (ft) Placed in center of mass Tamped or stemmed Deep water, water depth >R Elevated, untamped Shallow water, depth <R Earth tamping Ground placed, untamped 8.0 31 166 166 298 331 331 595 _____ Blocks of C4 Selected Answer: 29 8 Response Feedback: Correct. Nice work, SSG. Using the hasty table, the explosives required for reinforced concrete 8 feet thick using an elevated untamped charge is 298 blocks of C4.  Question 7 10 out of 10 points Activity 2 (Questions 6-9): Your unit has received a mission directive to calculate the charge necessary to breach reinforced concrete. Calculate a charge to breach reinforced concrete charge calculations use a hasty calculation method. Task : How many charges are required to cut the same reinforced concrete falling block obstacle 8' square and 20' wide? Selected Answer: b. 2 Response Feedback: Correct. Nice work, SSG. Using the rule of thumb for determining the number of charges, N is between 1.25 and 2.5, so N = 2 charges.  Question 8 10 out of 10 points Activity 2 (Questions 6-9): Your unit has received a mission directive to calculate the charge necessary to breach reinforced concrete. Calculate a charge to breach reinforced concrete charge calculations use a hasty calculation method. Task : Using the hasty method, calculate the amount of C4 (M112) required to destroy this

reinforced concrete falling block obstacle, using a ground placed, untamped charge. Reinforced concrete thickness (ft) Placed in center of mass Tamped or stemmed Deep water, water depth >R Elevated, untamped Shallow water, depth <R Earth tamping Ground placed, untamped 3.0 2 13 13 24 26 26 47 _____ Blocks of C4 Selected Answer: 4 7 Response Feedback: Correct. Nice work, SSG. Using the hasty table, the explosives required for reinforced concrete 3 feet thick using a ground placed, untamped charge is 47 blocks of C4.  Question 9 10 out of 10 points Activity 2 (Questions 6-9): Your unit has received a mission directive to calculate the charge necessary to breach reinforced concrete. Calculate a charge to breach reinforced concrete charge calculations use a hasty calculation method. Task : How many charges are required to cut the same reinforced concrete falling block obstacle? Selected Answer: c. 3 Response Feedback: Correct. Nice work, SSG. Using the rule of thumb for determining the number of charges, N is greater than 2.5, so round to the nearest whole number, so N = 3 charges.  Question 10 10 out of 10 points Activity 3 (Questions 10-13): Your unit has received a mission directive to calculate the charge necessary to breach a concrete shale slab. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Calculate the amount of explosives required for breaching materials other than reinforced concrete targets. Task : You have determined that you would require 63 blocks of C4 to breach a reinforced concrete slab. How many blocks of C4 would you require to breach a similarly sized shale slab? Enter your answer in the space below. Submit your response in numerals. Material Conversion Factor Earth 0.1 Ordinary masonry Hardpan Shale Ordinary concrete Rock Good timber Earth construction 0.5

Dense concrete First-class masonry 0.7 _____ packages Selected Answer: 3 2 Response Feedback: Correct. Nice work, SSG. The conversion factor for shale is 0.5, so 63 blocks for reinforced concrete coverts to 32 blocks for shale: P x Conversion Factor = number of packages 63 x 0.5 /1 = 31.5 Round up to 32 packages of C4* *Remember, you will always round this figure up to the next highest number.  Question 11 10 out of 10 points Activity 3 (Questions 10-13): Your unit has received a mission directive to calculate the charge necessary to breach a concrete shale slab. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Calculate the amount of explosives required for breaching materials other than reinforced concrete targets. Task : You have determined that you would require 44 blocks of C4 to breach a reinforced concrete slab. How many blocks of C4 would you require to breach a similarly sized dense concrete slab? Enter your answer in the space below. Submit your response in numerals. Material Conversion Factor Earth 0.1 Ordinary masonry Hardpan Shale Ordinary concrete Rock Good timber Earth construction 0.5 Dense concrete First-class masonry 0.7 _____ packages Selected Answer: 3 1 Response Feedback: Correct. Nice work, SSG. The conversion factor for dense concrete is 0.7, so 44 blocks for reinforced concrete coverts to 31 blocks for

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shale: P x Conversion Factor = number of packages 44 x 0.7 = 30.8 Round up to 31 packages of C4* *Remember, you will always round this figure up to the next highest number.  Question 12 10 out of 10 points Activity 3 (Questions 10-13): Your unit has received a mission directive to calculate the charge necessary to breach a concrete shale slab. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Calculate the amount of explosives required for breaching materials other than reinforced concrete targets. Task : Using the Hasty Method, breaching a reinforced concrete block that is 5’ square and 20’ wide would require 170 blocks of C4 using a ground placed, untamped charge. How many packages are required to breach two similarly sized charges of dense concrete? Material Conversion Factor Earth 0.1 Ordinary masonry Hardpan Shale Ordinary concrete Rock Good timber Earth construction 0.5 Dense concrete First-class masonry 0.7 _____ packages Selected Answer: 23 8 Response Feedback: Correct. Nice work, SSG. You will require 238 packages of C4 (M112) to breach this dense concrete object: Step 1. R= 5’, W= 20’, dense concrete, ground placed, untamped, C4 Step 2. (hasty table) 170 pkgs C4 x .7 (conversion factor) = 119 pkgs of C4 Step 3. N/A Step 4. N/A Step 5. N = W/2R = 20/10 = 2 charges Step 6. 119 pkgs x 2 charges = 238 pkgs of C4 (M112)  Question 13 10 out of 10 points

Activity 3 (Questions 10-13): Your unit has received a mission directive to calculate the charge necessary to breach a concrete shale slab. It is your responsibility to make the correct calculations of demolition charges to ensure the desired demolition effect. Calculate the amount of explosives required for breaching materials other than reinforced concrete targets. Task : Using the Hasty Method, breaching a reinforced concrete block that is 4’ square and 28’ wide would require 56 blocks of C4 using an elevated, untamped charge. How many packages are required for four charges of a similar sized block if it is made of ordinary masonry? Material Conversion Factor Earth 0.1 Ordinary masonry Hardpan Shale Ordinary concrete Rock Good timber Earth construction 0.5 Dense concrete First-class masonry 0.7 _____ packages Selected Answer: 11 2 Response Feedback: Correct. Nice work, SSG. You will require 112 packages of C4 (M112) to breach this ordinary masonry object: Step 1. R= 4’, W= 28’, ordinary masonry, elevated untamped, C4 Step 2. (hasty table) 56 pkgs C4 x .5 (conversion factor) = 28 pkgs of C4 Step 3. N/A Step 4. N/A Step 5. N = W/2R = 20/10 = 3.5. rounded up to 4 charges Step 6. 28 pkgs x 4 charges = 112 pkgs of C4 (M112)  Question 14 10 out of 10 points Activity 4 (Questions 14-18): Your unit has received a mission directive to calculate the charge necessary to breach several masonry columns. Calculate counterforce charges for rectangular masonry or concrete columns 4 feet thick or less. Task : The effectiveness of a counterforce charge results from the simultaneous detonation of two charges placed __________. Selected Answer: b. directly opposite each other

Response Feedback: Correct. Nice work, SSG. The effectiveness results from the simultaneous detonation of two charges placed directly opposite each other.  Question 15 10 out of 10 points Activity 4 (Questions 14-18): Your unit has received a mission directive to calculate the charge necessary to breach several masonry columns. Calculate counterforce charges for rectangular masonry or concrete columns 4 feet thick or less. Task : In counterforce charges, the amount of plastic explosive equals _____ times the thickness of the target in feet. Selected Answer: b. 1.5 Response Feedback: Correct. Nice work, SSG. In counterforce charges, the amount of plastic explosive equals 1 1/2 times the thickness of the target in feet (or 1 1/2 pounds of explosive per foot).  Question 16 10 out of 10 points Activity 4 (Questions 14-18): Your unit has received a mission directive to calculate the charge necessary to breach several masonry columns. Calculate counterforce charges for rectangular masonry or concrete columns 4 feet thick or less. Task : Your next step is to calculate the explosives necessary to cut the steel rod within the reinforced concrete as shown here. Enter your answer in the space below. Submit your response in numerals. _____ pound(s) Selected Answer: 2 Response Feedback: Correct. Nice work, SSG. For materials between 1 and 2 inches in diameter or thickness, you’ll apply the rule of thumb method and use two pounds of explosives.  Question 17 10 out of 10 points Activity 4 (Questions 14-18): Your unit has received a mission directive to calculate the charge necessary to breach several masonry columns. Calculate counterforce charges for rectangular masonry or concrete columns 4 feet thick or less. Task : Calculate the minimum amount of C4 (M112) required to destroy 100 concrete cubes, 3’ thick using the counterforce charge method. _____ packages

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Selected Answer: 40 0 Response Feedback: Correct. Nice work, SSG. You will require 400 packages of C4 (M112) to destroy 100 3-foot cubes: Step 1. 100 cubes, 3 feet thick, counterforce charge, C4 (M112) Step 2. P = 1.5W, 1.5(3) = 4.5 lbs. of explosives Step 3. N/A Step 4. 4.5/1.25 = 3.6, rounded up to 4 packages of C4 Step 5. 100 cubes = 100 charges Step 6. 4 pkgs x 100 charges = 400 pkgs of C4 (M112)  Question 18 10 out of 10 points Activity 4 (Questions 14-18): Your unit has received a mission directive to calculate the charge necessary to breach several masonry columns. Calculate counterforce charges for rectangular masonry or concrete columns 4 feet thick or less. Task : Calculate the minimum amount of C4 (M112) required to rubble 80 concrete cylinders, 24” thick. _____ packages Selected Answer: 24 0 Response Feedback: Correct. Nice work, SSG. You will require 240 packages of C4 (M112) to destroy 80 2-foot cylinders: Step 1. 80 cylinders, 2 feet thick, counterforce charge, C4 (M112) Step 2. P = 1.5W, 1.5(2) = 3 lbs. of explosives Step 3. N/A Step 4. 4.5/1.25 = 2.4, rounded up to 3 packages of C4 Step 5. 80 cylinders = 80 charges Step 6. 3 pkgs x 80 charges = 240 pkgs of C4 (M112)

B03 Practical Exercise Breach Charges

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