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- 302. 1R-04 Guide for Concrete Floor and Slab Construction
This guide presents state-of-the-art information relative to the construction of slab-on-ground and suspended-slab floors for industrial, commercial, and institutional buildings It is applicable to the construction of normalweight and struc-tural lightweight concrete floors and slabs made with conven-tional portland and blended cements
- Acceptable concrete cracking
Acceptable concrete cracking Q What is considered as acceptable concrete cracking in cast-in-place foundation walls and slabs per ACI documents? My company is the concrete contractor on a large warehouse project, and I want to discuss the potential for cracking with the contractor and the owner A Concrete cracks are possible on any project, so it’s wise to set reasonable expectations for
- When should saw cuts be made on a concrete slab?
A Saw cuts, also called relief cuts, should be timed carefully to control cracking and maintain the integrity of the slab According to ACI 302 1R-15, saw-cutt
- Difference between a contraction joint, isolation joint, expansion . . .
Difference between a contraction joint, isolation joint, expansion joint, construction joint, and a cold joint Q What is the difference between a contraction joint, isolation joint, expansion joint, construction joint, and a cold joint? A A contraction joint is formed, sawed, or tooled groove in a concrete structure to create a weakened plane to regulate the location of cracking resulting
- ACI 347R-14: GUIDE TO FORMWORK FOR CONCRETE
The definitions provided herein complement that source backshores—shores left in place or shores placed snugly under a concrete slab or structural member after the original formwork and shores have been removed from a small area, without allowing the entire slab or member to deflect or support its self-weight and construction loads
- The Floor Flatness Report - American Concrete Institute
the slab surface is, demonstrating the quality of the initial strike off and finishing process The F-number system uses floor surface curvature calculated from elevation differences over 24 in (600 mm) increments as a measure of flatness (Fig 2)
- What nominal maximum sizes of aggregate are recommended?
What nominal maximum sizes of aggregate are recommended? Q What nominal maximum sizes of aggregate are recommended? A According to 26 4 2 1 (a) (5) of ACI 318-19, nominal maximum size of coarse aggregate shall not exceed the least of (i), (ii), and (iii): (i) one-fifth the narrowest dimension between sides of forms (ii) one-third the depth of slabs (iii) three-fourths the minimum specified
- 224R-01 Control of Cracking in Concrete Structures
The principal causes of cracking and recommended crack-control proce-dures are presented The current state of knowledge in microcracking and fracture of concrete is reviewed The control of cracking due to drying shrinkage and crack control in flexural members, overlays, and mass con-crete construction are covered in detail Long-term effects on cracking are considered and crack-control
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