Concrete is a building material made up of cement, aggregate (usually a coarse aggregate made from gravel or crushed rocks like limestone or granite, plus a fine aggregate like sand), water, and chemical admixtures. In this page, the definition of concrete density is presented, as well as concrete density values from various sources.
Concrete Definition:
Concrete, an artificial stone-like mass, is the composite material that is created by mixing binding material (cement or lime) along with the aggregate (sand, gravel, stone, brick chips, etc.), water, admixtures, etc in specific proportions. The strength and quality are dependent on the mixing proportions.
Concrete density is an important characteristic. Concrete density varies according on the amounts of the ingredients used to manufacture it. Cement, water, sand, and gravel are common ingredients in a concrete mix. Depending on the purpose of the concrete, the percentage of each constituent changes. A concrete mix used to make sidewalks, for example, would have a different percentage of materials than a mix used to make a building foundation.
Also Check : How much does a yard of concrete weigh?
High Density Concrete
High density concrete is a type of concrete that has a higher density than regular concrete. The increased density is usually achieved by adding weight to the concrete mix. The added weight can come from any number of materials, but the most common is to add a heavy aggregate such as gravel or sand. Other materials that can be used to increase the density of concrete include iron or steel fibers, and even plastic or glass fibers.
Bulk Density of Concrete
The bulk density or unit weight of concrete is the mass or weight of the concrete that is required to fill a container of a specified unit volume.
Key Features:
- If the volume is unit then, Bulk Density= Mass.
- Unit in kg/m3 or lb/ft3. lb/ft3 is also used as pcf. To convert between different density units,
- In this definition, the volume contains both the concrete and the voids between concrete particles.
- Here, the Standard test method for determining the bulk density of concrete is given in ASTM C138 / C138M (AASHTO T 121M/T 121). [1]
Standard Values of Concrete Density
We have found the following sources where the standard value of the density of concrete is provided.
The density of normal concrete is 2400 kg/m3 (150 pcf or lb/ft3) and the density of lightweight concrete is 1750 kg/m3(110 pcf or lb/ft3)
Dorf, Richard. Engineering Handbook.New York: CRC Press, 1996.
Typical density of concrete 2.3 g/cm3 (143.6 pcf or lb/ft3 / 2300 kg/m3)
Brooklyn Public Library Files; 1999
Volume generally assumed for the density of hardened concrete is 150 lb/ft3 (2400 kg/m3)
McGraw-Hill Encyclopedia of Science and Technology.
Density in Place: Density of normal CLSM in place typically ranges from 90 to 125 pounds per cubic foot (1840 to 2320 kg/cubic m)
Concrete Basics. Portland Cement Association..
Density Concrete 2242 kg/m³
Conversion Factors, Material Properties and Constants, Edward Boyden, MIT.
While conventional concrete has a density of about 2300 kg/m3, lightweight concrete has a density between 160 and 1920 kg/m3.
Material Notes. Faculty of the Built Environment, University of New South Wales.
The concrete must be of a lightweight nature, with a mass of not greater than 1.5 kg/100 mm cube or a density of 1500 kg/m3
Cube Competition. Concrete Society of Southern Africa.
Density (kg/m3) 1450–1850
Baldwin, Kelly. Electrically Conductive Concrete: Properties and Potential. Construction Canada. Vol. 98, №1 (January/February 1998): 28–29.
Typically, concrete has a density of 150 pounds per cubic foot, which means that a block of concrete that is one foot wide, one foot long, and one foot high would weigh 150 pounds. Water has the density of only 62.4 pounds per cubic foot.
Is anyone buried in Hoover Dam? Bureau of Reclamation, US Department of the Interior.
References : https://civiltoday.com/civil-engineering-materials/concrete/361-density-of-concrete
