1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
wariber [46]
3 years ago
8

(8 points) Consider casting a concrete driveway 40 feet long, 12 feet wide and 6 in. thick. The proportions of the mix by weight

are given as 1:2:3 for cement, sand, and gravel with w/c of 0.50. The specific gravities of sand and gravel are 2.60 and 2.70 respectively. Entrained air content is 7.5%. How many pounds of cement, water, sand, and gravel are needed for the driveway?
Engineering
1 answer:
FromTheMoon [43]3 years ago
8 0

Answer:

Weight of cement = 10909.08 pounds

Weight of sand = 18008.64 lb

Weight of gravel = 28051.92 lb

Weight of water = 5454.54 lb

Explanation:

given data

length = 40 feet

width = 12 feet

thickness = 6 in = 0.5 feet

mix proportion = 1:2:3

specific gravity of cement = 3.15

specific gravity of sand = 2.60

specific gravity of gravel = 2.70

water to cement ratio = 0.50

solution

first we get here total volume that is

volume = length × width × thickness    ...........1

volume = 40  × 12 × 0.5

volume = 240 feet³

and

now we get here dry volume of concrete that will be

Dry volume =  wet volume ×  1.54    .......................2

Dry volume = 240 × 1.54

Dry volume =  360 feet³

and

we have given air content entrained is = 7.5 %

so required volume will be as

required volume = Dry volume × ( 1 - 7% )    .............3

required volume = 360 × ( 1 - 7.5 % )

required volume = 333 feet³  

and

total ratio is

total ratio = 1+ 2+ 3

total ratio = 6

so volume of sand cement and gravel will be

volume of  cement = \frac{1}{6} \times 333  

volume of  cement = 55.5 feet³

volume of  sand  = \frac{2}{6} \times 333

volume of  sand  = 111 feet³

volume of  gravel = \frac{3}{6} \times 333  

volume of  gravel = 166.5 feet³

and

now we get here weight of sand cement and gravel as

weight = volume ×  specific gravity × density of water   .............4

and now put here value and we get

Weight of cement = 55.5 × 3.15 × 62.4

Weight of cement = 10909.08 pounds

and

Weight of sand = 111 × 2.60 × 62.4

Weight of sand = 18008.64 lb

and

Weight of gravel = 166.5 × 2.7 × 62.4

Weight of gravel = 28051.92 lb

and

Weight of water = 0.5 of weight of cement

Weight of water  = 0.5 ×  1090.9.08

Weight of water = 5454.54 lb

You might be interested in
Which of the following is NOT an example of a direct cost of workplace injuries?
hammer [34]

Answer:

Lost productivity

4 0
3 years ago
To compute the energy used by a motor, multiply the power that it draws by the time of operation. Con- sider a motor that draws
ehidna [41]

Answer:

E=52000Hp.h

E=38724920Wh

E=1.028x10^11 ftlb

Explanation:

To solve this problem you must multiply the engine power by the time factor expressed in h / year, to find this value you must perform the conventional unit conversion procedure.

Finally, when you have the result Hp h / year you convert it to Ftlb and Wh

E=(12.5hp)(\frac{16h}{day} )(\frac{5 days}{week} )(\frac{52week}{year} )\\

E=52000Hp.h

E=52000Hp.h(\frac{744.71Wh}{Hp.h} )\\

E=38724920Wh

E=52000Hph(\frac{1977378.4  ft lb}{1Hph}

E=1.028x10^11 ftlb

3 0
3 years ago
What size resistor would produce a current flow of 5 Amps with a battery voltage of 12.6 volts​
Debora [2.8K]

Answer:

resistance = 2.52 ohms

Explanation:

from the formula

V =IR

Voltage = (current)(resistance)

Resistance =

R=

R= 2.52 ohms

5 0
3 years ago
A 25-W compact fluorescent lightbulb (CFL) produces the light equivalent of a 100-W incandescent bulb. The population of North A
wariber [46]

Answer:

Coal required is 101 Teragram/year.

Coal saved is 25.25 Teragram/year.

Explanation:

1 Teragram is exactly 1000000000 kilograms.

8 0
3 years ago
What’s a pigtail when wiring
Levart [38]

Answer:

A pigtail when wiring is technique that is used in connecting a lot of wires together.

Explanation:

A pigtail is a wire that is short in length. It has two ends. One end has a connector while the other end has other wires connected to it.

Pigtail when wiring is the connection of more than one wire in a circuit to another device. Pigtail when wiring helps to extend the length of the wire in a circuit if the wire used it short).

Pigtail when wiring is a technique what helps to keep the circuit organised because it prevents the wires from getting tangled.

7 0
3 years ago
Other questions:
  • Air enters a compressor steadily at the ambient conditions of 100 kPa and 22°C and leaves at 800 kPa. Heat is lost from the comp
    11·1 answer
  • Two gases—neon and air—are expanded from P1 to P2 in a closed-system polytropic process with n = 1.2. _____ produces more work w
    7·1 answer
  • Block A is released from rest and slides down the frictionless ramp to the loop. The maximum height h of the loop is the same as
    6·1 answer
  • When you do a vehicle check, what do you NOT need to keep an eye on?
    9·1 answer
  • A wooden pallet carrying 540kg rests on a wooden floor. (a) a forklift driver decides to push it without lifting it.what force m
    8·1 answer
  • What was the most important thing you learned this school year in your engineering class and why did you choose this thing
    15·1 answer
  • Joey has a car that uses the hand crank to open the windows. Joey is wondering where the energy comes from to open the windows.T
    11·1 answer
  • Which of the following is NOT one of the 3 technology bets we have made?
    15·1 answer
  • Conclude from the scenario below which type of documentation Holly should use, and explain why this would be the best choice
    15·2 answers
  • A wheel spins at a constant angular speed of 24rad/s.How many revolutions will the dosk go through in 5minutes?​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!