DCBII
Structural
- Apr 15, 2010
- 187
There have been several discussions related to this, but they seem to be targeted to very specific situations. I want to have a more general discussion with other engineers on this. Thanks for your thoughts in advance.
Q1: For conventionally reinforced slabs/mats (water-bearing - or not if you've never done water-bearing), what's the largest distance between control joints you're willing to go, assuming the reinforcement ratio is at least 0.005? Why?
Q2: How about at even higher ratios?
Q3: What types of joints do you use?
Q4: What's the largest single placement you've done? How did it go? What were the parameters (e.g. reinf. ratio)?
So we're all on the same page regarding definitions:
-Control joints: any of the joints described below.
-Movement joints: Expansion or contraction joints as described below.
-Expansion joints: no reinforcement continues through the joint - meant to allow for thermal expansion
-Full contraction joints: no reinforcement continues through the joint - meant to control shrinkage cracking
-Partial contraction joints: 50% or less reinforcement continues through the joint - meant to control shrinkage cracking
-Construction joints: all reinforcement continues through the joint - provided for the contractor's convenience and/or to limit placement size
Q1: For conventionally reinforced slabs/mats (water-bearing - or not if you've never done water-bearing), what's the largest distance between control joints you're willing to go, assuming the reinforcement ratio is at least 0.005? Why?
Q2: How about at even higher ratios?
Q3: What types of joints do you use?
Q4: What's the largest single placement you've done? How did it go? What were the parameters (e.g. reinf. ratio)?
So we're all on the same page regarding definitions:
-Control joints: any of the joints described below.
-Movement joints: Expansion or contraction joints as described below.
-Expansion joints: no reinforcement continues through the joint - meant to allow for thermal expansion
-Full contraction joints: no reinforcement continues through the joint - meant to control shrinkage cracking
-Partial contraction joints: 50% or less reinforcement continues through the joint - meant to control shrinkage cracking
-Construction joints: all reinforcement continues through the joint - provided for the contractor's convenience and/or to limit placement size
