Concrete: Difference between revisions
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=External Links= | =External Links= | ||
*[https://en.wikipedia.org/wiki/Concrete The Wikipedia Page on Concrete] | *[https://en.wikipedia.org/wiki/Concrete The Wikipedia Page on Concrete] | ||
*[https://www.youtube.com/channel/UCrvfiHNDS_QI-FgKQSmTITQ YouTube Channel of Professor Tyler Ley] | |||
[[Category: Composite Materials]] [[Category: Materials]] | [[Category: Composite Materials]] [[Category: Materials]] | ||
Revision as of 14:41, 10 December 2020
Formula
- 10% cement, 75% aggregate, 15% water [1]
- 150 kg/m3 of cement - with concrete at 4000 lb/cu yd [2] - was sufficient to get about 6000 psi concrete strength [3]. Does this mean abouut 8% of cement?
- 500 lb per yard of cement in concrete is recommended - read a thesis on it - [4]
- Lean or rich: 7-15% cement by volume -
- Lean concrete per california codes is 300 lb cement per yard of concrete, and is 700 PSI at 7 days. [5]
- Lean is used below foundations - and is 700 psi or 1100 psi [6]
Slab Requirements
Concrete Slump Testu
Measures inches of collapse, from 0-12", of a wad of concrete in a cone. 12" means it's complete water. 4" is very stiff.