Score Lines in S.O.G.

[CivilStructural07]

Does anyone know the maximum square footage for a slab-on-grade before score lines are needed to prevent cracking? The application is a foundation for 2 calcium nitrate tanks. A construction joint will be provided around the perimeter of the tanks. It's just around the outside of the tanks (beyond the construction joint) that's in question.

 

[civilperson]

20-25 times the thickness with a max ratio of 1.25 to 1.0 for long to short dimensions is recommended for pavement. I have used 4" x 4" woven wire fabric with heavy wires, 0.125 to 0.25" diameter, successfully with no joints or scoring for dimensions up to 40 times the thickness. Good cure, (submerged for 7 days), is recommended.

 

[dik]

Low slump, large aggregate and sawcutting time is critical.

Dik

 

[fattdad]

Nothing prevents cracking in slab-on-grade concrete. The "score lines" control the cracking to a regular position. If you REALLY want to control cracking, post-tension the slab.

f-d

¡papá gordo ain’t no madre flaca!