When blended with 2.5 quarts of water, one 60-pound bag of concrete yields 45 cubic feet of concrete. When blended with 4 quarts of water, one 80-pound bag of concrete generates 60 cubic feet. To determine the number of bags needed for a given depth, divide the total volume by the percentage specified for each type of concrete.
For example, if you want to pour a foot of concrete that is 3 inches deep, you will need about 75 cubic feet of concrete, or 20 pounds. This means that you will need at least three 40-pound bags of concrete.
The amount of water required depends on the temperature and the type of concrete. The following chart shows the average percentages of water required by various types of concrete.
Type Of Concrete Percent Water Required By Volume Varying From As Low As 15% To As High As 35%
Ordinary concrete requires approximately 20 percent water by volume. Low-slump concretes require up to 10 percent less water and high-slump concretes require up to 25 percent more water than ordinary concrete. The type of aggregate used in the concrete also affects how much water it needs. For example, coarse aggregates such as crushed rock or gravel require more water than fine aggregates like sand.
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 weight of the bag times the height of the bag times the depth of the bag. For example, if you have a 50-foot length of pipe and need to fill it with concrete, then you would need two 20-pound bags of concrete to fill it up.
Concrete is heavy stuff! The volume of concrete needed depends on how deep you want the concrete to be. For example, if you wanted the concrete to be 10 inches deep, then you would need a volume of concrete equal to 10 x the weight of the bag times the height of the bag times the depth of the bag. In this case, that means you would need a volume of concrete equal to 10 x 100 pounds x 10 inches = 1000 square inches. If you were to pour this into a bucket, it would measure about 9 inches in diameter and 18 inches tall.
Here's where it gets tricky: The volume of concrete required will change depending on whether you are pouring a small hole or a large one.
60 bags A cubic yard of concrete requires 60 bags of concrete mix. A yard contains 27 cubic feet of concrete. This means that 1 yard of concrete requires about 3 quarts (1 gallon) of cement.
Concrete is a mixture of water and cement powder, which reacts with the water to form a solid material. For every two parts by weight of cement, one part by weight of water is required to produce a plastic mass. Concrete also includes aggregate, which provides strength and durability to the material when it's used in construction. The three main types of aggregates are sand, gravel, and crushed stone. Concrete can also include additives such as air-entraining agents to improve its workability or curing agents to speed up the hardening process.
The density of concrete is about 2000 kg/m3. This means that a cubic meter of concrete weighs about 2 tonnes.
There are approximately 2.5 million residential yards in the United States. This means that there are approximately 50 billion pounds of concrete per year being used in America. Concrete is used in houses, apartments, offices, schools, and other buildings. It is also used in roads, bridges, and parking structures.