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Matt Mettler, P.E. DOWL HKM. Isolation Joints Construction Joints Contraction Joints Expansion Joints.

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Presentation on theme: "Matt Mettler, P.E. DOWL HKM. Isolation Joints Construction Joints Contraction Joints Expansion Joints."— Presentation transcript:

1 Matt Mettler, P.E. DOWL HKM

2 Isolation Joints Construction Joints Contraction Joints Expansion Joints

3 Doweled Tied Keyed Tooled Insert (zip strips) Butt Joints

4 Type of control joint Allows for drying shrinkage and other movements Provides no vertical or horizontal restraint May act as an expansion joint if needed

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6 Can be constructed of multiple types of joints: Doweled Tied Keyed Butt Joint Are spaced and or located to facilitate construction Concrete quantity limitation Sequencing of construction tasks

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8 Also known as control joints Controls cracking due to drying shrinkage May be constructed from a variety of methods: Hand tooled Saw Cut (my preference) Inserts

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10 Used primarily in exterior conditions Can be doweled but not keyed or tied Allows for un-restrained movements due to temperature gradients Can be sealed

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12 Function of concrete thickness, coarse aggregate size and concrete slump PCA recommends the joint spacing be 2 to 3 times (in feet) the concrete thickness (inches) Example: a 5 inch slab would have joints spaced 10 to 15 feet It is good practice to maintain a square shape in so much as practical

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14 Structure geometry and other elements such as interior walls, columns and piers may dictate layout.

15 Contraction joints: Should be doweled or tied Saw cut floors Formed with chamfer strips for walls Try to maintain a square shape between joints May need waterstop and or joint sealant Construction joints: Should be doweled or tied and keyed Use chamfer strips for adequate consolidation May need special attention regarding drainage because of hydraulic loading.

16 Bureau of Reclamation, Concrete Manual, 8 th Edition Revised, 1981 Ringo & Anderson, Designing Floor Slabs on Grade, 1992 Spears & Panarese, Concrete Floors on Ground, EB075.2D, Portland Cement Association, Skokie, IL, second edition 1983; revised Young & Paxson, Undermining of Spillway Chutes, Safety of Dams Conference, Seattle, WA, Fall 2010.


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