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10-15-2012, 09:42 AM   #1
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## Mathematical Challenge

If a cement additive calls for one pound per cubic yard, then how much is needed for a 60# bag?

10-15-2012, 09:46 AM   #2
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Quote:
 Originally Posted by jrepp44 If a cement additive calls for one pound per cubic yard, then how much is needed for a 60# bag?
How much crete does the 60# bag make?

Example:

If the 60# bag makes say 1/2 cubic yard crete then your ratio would be 1/2 lb(8 oz) of additive for 1/2 cubic yard of crete.

If the 60# bag makes say 3/8 cubic yard of crete then your ratio would be 3/8 lb(6 oz) of additive for 3/8 cubic yard of crete.

Appears to be a 1:1 ratio as long as you keep the units in pounds of additive per cubic yards of crete. Pretty simple

Last edited by hammerlane; 10-15-2012 at 11:02 AM.

10-15-2012, 10:32 AM   #3
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Quote:
 Originally Posted by jrepp44 If a cement additive calls for one pound per cubic yard, then how much is needed for a 60# bag?

A 60# bag is 0.45 cubic feet,and there's 27 cubic feet to a cubic yard,you do the math,and whatever you do don't let hammerlane do it.

Last edited by Canarywood1; 10-15-2012 at 10:37 AM.

 The Following 2 Users Say Thank You to Canarywood1 For This Useful Post: AndyGump (10-15-2012), tony.g (10-17-2012)

10-15-2012, 11:07 AM   #4
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Quote:
 Originally Posted by Canarywood1 whatever you do don't let hammerlane do it.

What??? Based on the poster's original statement of a cement additive that calls for one pound of additive per one cubic yard of crete if you get something different from what I have you best check your abacus.

0.45 cubic feet is 1/60 of a cubic yard.

So you need 1/60 of a lb of additive for 1/60 of a cubic yard of crete.

1/60 of a lb is about 1/4 oz

Whats wrong with the math?

Last edited by hammerlane; 10-15-2012 at 11:12 AM.

 10-15-2012, 12:52 PM #5 Member   Join Date: May 2012 Location: Sarasota,Florida Posts: 2,920 Rewards Points: 3,740 OOPS i reread the original post,my humble apologies to you hammerlane,you are right.
10-15-2012, 02:52 PM   #6
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Quote:
 Originally Posted by hammerlane What??? Based on the poster's original statement of a cement additive that calls for one pound of additive per one cubic yard of crete if you get something different from what I have you best check your abacus. 0.45 cubic feet is 1/60 of a cubic yard. So you need 1/60 of a lb of additive for 1/60 of a cubic yard of crete. 1/60 of a lb is about 1/4 oz Whats wrong with the math?
This is much easier to follow that the previous post.
Of course a 60# bag of crete will never equal 1/2 yard of crete. I understand the ratio you are trying to convey, it was just weird stating it that way.

Andy.
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 10-15-2012, 03:12 PM #7 Concrete & Masonry   Join Date: Nov 2008 Location: Wisconsin Posts: 3,480 Rewards Points: 620 .25 ounce per 60# bag............
10-15-2012, 08:15 PM   #8
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Quote:
 Originally Posted by AndyGump I understand the ratio you are trying to convey, it was just weird stating it that way.
Appears to be a 1:1 ratio as long as you keep the units in pounds of additive per cubic yards of crete. Pretty simple.

Don't know how this is a weird way of stating it.

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