SOLUTION: A certain mixture for concrete is in the amounts of 1:2:4; 1 cu. ft. of cement. 2 cu. ft. of sand. 4 cu. ft. of gravel / rock. Concrete contains spaces or "voids" tha

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Question 1193857: A certain mixture for concrete is in the amounts of 1:2:4;
1 cu. ft. of cement.
2 cu. ft. of sand.
4 cu. ft. of gravel / rock.

Concrete contains spaces or "voids" that is filled.

The 1:2:4 mixture doesn't make 7 cu. ft. of concrete, but less.

My question: How is the total calculated ?
Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.

The volumes of the mixtures are given in the post.

The components are not a concrete.
Even the sum of components is not concrete yet.

To get a concrete, water must added in some proportion and the mixture should be stirred carefully.

Then some physical and chemical processes take place in the mixture (like baking bread).

The result of this technological process is concrete.

Resulting volume of concrete is not equal the sum of volumes of components.


About physical and chemical processes of getting concrete read and learn from links below

https://www.britannica.com/technology/concrete-building-material

https://en.wikipedia.org/wiki/Concrete

https://www.concretenetwork.com/concrete.html


For your info: this site/forum is about Math.

Your question is far from the focus / (subject) of this site/forum.


The way to estimate the volume of the concrete having given the masses of components and water
is to divide the total mass of components (including water) by the density of concrete.