 # How many cubic feet are in an 80-pound bag of concrete?

An 80-pound bag of concrete provides 0.60 cubic feet of wet concrete when combined with the appropriate amount of water. Concrete is made up of Portland cement, sand, stone, gravel, and additives that cause it to cure as it dries. An 80-pound bag requires around 6 quarts of water to thoroughly mix. The specific volume of a mixture of concrete ingredients will vary depending on how much water you include in the mix.

There are 16 square inches of surface area on a 508-cubic-foot box. How many boxes will be required to fill an 80-pound bag of concrete? You can calculate the number of boxes needed by using the formula: Number of boxes = (0.6 CF) / [specific volume of mixture]. Or, you can simply divide 0.60 by the specific volume of your mixture and then multiply by 100 to get the number of boxes needed.

The specific volume of a mixture depends on the proportion of water to cement by weight. For example, if the concrete mixture had a specific volume of 0.40, it would require 40 percent more boxes than what is calculated here to fully mix the concrete.

It's important to use a consistent amount of water when mixing concrete. Add too much water and the concrete will not harden properly; add too little water and it won't blend together smoothly. For accurate calculations, it's best to use the actual weight of the concrete rather than just its volume.

## How far does a bag of concrete go?

A 60-pound bag of hardened concrete yields 0.45 cubic feet. An 80-pound bag of hardened concrete yields 0.6 cubic feet. A 100-pound bag of hardened concrete yields 0.75 cubic feet.

The volume of concrete is the product of its weight and length. Concrete weighs approximately 2.7 pounds per cubic foot when it is fresh out of the mixer.

Concrete usually becomes less dense as it cures (ages), so it may increase in volume as it sets. The rate at which it expands depends on several factors such as the type of cement used, the ratio of water to cement, and the temperature. Cement begins to harden as soon as it comes into contact with water, so it is important to add sufficient water to produce a workable mixture. If it is not watered down enough, the mix will be too dry and hard to pour; if it is watered down too much, the mix will be too wet and likely to crack when exposed to heat or pressure during later stages of processing or use.

As concrete sets, it tends to shrink, especially if it is made with coarse aggregate. This is because the spaces between the grains of the aggregate can allow some of the water to drain out.

## How many bags of cement do I need for a flagpole?

For every 80-pound bag of concrete mix, add roughly 5 pounds of water. This will make a slurry that is easy to stir and pour.

For a 4-foot-high by 1-1/4-inch-diameter pole, you should use one 20-pound bag of concrete for your base, plus another two 10-pound bags for your top two feet. This makes a total of five 20-pound bags of concrete.

The pole itself should be at least 6 inches in diameter for optimal strength while still being able to pour a cap on top. This means that you should use a coarse aggregate like gravel or rock for your base, rather than the finer sand most often used for home projects. The coarser the better as far as durability is concerned; this will help prevent cracks from forming due to movement off site or over time.

As far as height goes, try to select a spot where it won't get blown over by wind. A location that gets full sun during part of the day will also give it time to dry out which helps prevent cracking. You should be able to find an area near some source of water if needed but not in its direct path.

## How do you calculate 1000 square feet of concrete?

Concrete's wet volume is equivalent to 1000 sq ft x 0.334 ft = 334 cu ft. To convert the wet volume of concrete to the dry volume of concrete, multiply the wet volume of concrete by 1.54. Answer: A 1000 sq ft slab of 4 inch thick m20 grade concrete requires -76 cement bags (3813 kgs).

The total weight of a 4000 lb (1800 kg) truck is 4400 lbs (2000 kg), so one truck can haul out 10000 sq ft (93 m2). That's about half a million dollars' worth of concrete!

One cubic yard (0.907 m3) of concrete has a density of 3200 pounds per cubic foot (ppcf), or 640 pounds per cubic meter (pccm). The average density of common concrete is 400-500 pccm, so it takes less than half as much concrete to make a given volume.

For a 10,000 sq ft (930 m2) house, you need 2.94 million pounds of concrete (1.8 million kg). That's almost a quarter of a million dollars!

The amount of concrete required for an average-size house varies greatly, depending on how much it is used up in walls and floors.

## What is the ratio of dry concrete to cement?

According to civil design professionals, it is necessary to include shrinkage in concrete, and hence a factor of safety ranging from 1.54 to 1.57 to counteract such shrinkage. As a result, the volume of dry concrete is 1.54 to 1.57 times more than the amount of wet concrete. 8.22 bags of cement will therefore yield 9 holes 3 inches deep.

Concrete has a specific weight that does not change regardless of what type of concrete you make. The weight of a cubic foot of concrete made with portland cement is 3150 pounds. Concrete weighs less as it dries out because water reduces its weight. Dried concrete can be as heavy as granite!

The ratio of dry concrete to cement depends on how much concrete you make and whether it is internal or external. If you make a single slab 7 feet by 10 feet, then it has an area of 70 square feet. This means that you need about 70/100 of a bag of cement per square foot of concrete. For example, if you use 45 pounds of cement per 100 square feet, then the concrete needs to be mixed with 20 percent extra water to ensure proper hydration and strength after it sets.

If you make a wall instead, then the total area available for cement is 4250 square feet. You would need 4250/100 of a bag of cement per square foot of concrete. 