Calculating Concrete Materials for 1.68m³ Base

[matfive]

Homework Statement

hello I have to make a concrete base in metres cubed total 1.68 metres cubed.
The ratio to concrete is 1 part cement to 2 parts sand and 3 parts gravel.
how much cement,gravel, and sand in kilograms?

Homework Equations

?

The Attempt at a Solution

?

 

[jhicks]

You need to find rough numbers for the density of sand, cement and gravel to do this problem.

 

[matfive]

is it 1/6 times 1.68 metres for cement and how to convert it to kilograms.

 

[jhicks]

is it 1/6 times 1.68 metres for cement and how to convert it to kilograms.

Not necessarily. One part (molecule) of cement could take up twice the volume as 1 part (molecule) of sand. You need to know the molecular weight (kg / mol) by knowing the chemical composition as well as the density (in kg/m^3).