Revision as of 19:46, 19 November 2025

Basics

The Combination of Aggregate and Cement
It takes 5 94 lb bags of cement to make a yard of concrete [1]. In other words, a 50kW Solar Concrete plant will make a yard of concrete daily. Or, 10 days to make a slab foundation for Rosebud models of the Seed Eco-Home

To make 1 yard - To make 1 cubic yard of concrete, you'd need seven 94-pound bags of cement, about 1/2 cubic yard of sand and just over 3/4 cubic yard of gravel. The amount of water you use depends on how wet the sand is.Oct 1, 2009 [2]
10% cement, 75% aggregate, 15% water [3]
150 kg/m3 of cement - with concrete at 4000 lb/cu yd [4] - was sufficient to get about 6000 psi concrete strength [5]. Does this mean abouut 8% of cement?
500 lb per yard of cement in concrete is recommended - read a thesis on it - [6]
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. [7]
Lean is used below foundations - and is 700 psi or 1100 psi [8]

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.

Unlike Metal or Plastic or Dimensional Lumber , A Concrete Mixtures FINAL qualities will only be known once it cures
The conditions in which the concrete cure also impact this

”Overbuild” such that even if a mix underperforms it still meets the required Concrete Specifications for that Concrete Mix
- Main Downside of this is Cost
Thorough Recordskeeping + Concrete Tests
Pre-Cast Concrete
- Rather than try and account for uncontrolled conditions…control the conditions
- Main downside is this takes away the advantage of not having to transport the giant Concrete Slab and just being able to move smaller bags or boxes or a Concrete Mixer etc
- If designed properly, such as in the widespread use of Precast Concrete in the USSR such as Plita Aerodromnaya Gladkaya or Brezhnevkas etc it CAN be done

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 =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.
+=Challenges Introduced by the Curing Process=
+*Unlike [[Metal]] or [[Plastic]] or [[Dimensional Lumber]] ,  A Concrete Mixtures FINAL qualities will only be known once it cures
+*The conditions in which the concrete cure also impact this
+==Potential Solutions==
+*”Overbuild” such that even if a mix underperforms it still meets the required [[Concrete Specifications]] for that [[Concrete Mix]]
+**Main Downside of this is Cost
+*Thorough [[Recordskeeping]] + [[Concrete Tests]]
+*[[Pre-Cast Concrete]]
+**Rather than try and account for uncontrolled conditions…control the conditions
+**Main downside is this takes away the advantage of not having to transport the giant [[Concrete Slab]] and just being able to move smaller bags or boxes or a [[Concrete Mixer]] etc
+**If designed properly, such as in the widespread use of Precast Concrete in the USSR such as [[Plita Aerodromnaya Gladkaya]] or [[Brezhnevkas]] etc it CAN be done
 =Internal Links=