Calculating Concrete Materials for 1.68m³ Base

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Homework Help Overview

The original poster is tasked with calculating the quantities of cement, sand, and gravel needed for a concrete base totaling 1.68 cubic meters, using a specified ratio of materials.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the need to determine the densities of the materials involved and question how to convert volume measurements to weight in kilograms. There is also a consideration of the implications of the material ratios on volume and weight calculations.

Discussion Status

Some participants have suggested finding density values as a starting point, while others are exploring the relationship between volume and weight, indicating a productive exploration of the problem's requirements.

Contextual Notes

There is a lack of specific density values for the materials mentioned, which is crucial for progressing with the calculations. Additionally, the original poster's understanding of the ratios and their implications on volume and weight is being questioned.

matfive
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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



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The Attempt at a Solution


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You need to find rough numbers for the density of sand, cement and gravel to do this problem.
 
is it 1/6 times 1.68 metres for cement and how to convert it to kilograms.
 
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).
 
Last edited:

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