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RE: Concrete Wall Shrinkage & Construction Joints[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Concrete Wall Shrinkage & Construction Joints
- From: "Sherman, William" <ShermanWC(--nospam--at)cdm.com>
- Date: Wed, 24 Aug 2005 14:36:28 -0400
ACI 350.4R-04 states that the spacing of construction joints "should usually not exceed 60-ft, with 30 to 50-ft being more common" and notes that "extra horizontal reinforcement may be desirable near the base of wall to assist in control of cracks near the base". Even at these spacings, the restraint at the base of wall due to attachment to the base slab relative to free movement at the top of wall tends to cause some vertical shrinkage cracks in the lower part of the wall. I generally like to limit construction joint spacing to 40-ft maximum, but this is always a matter of judgment.
Spacing of movement joints is addressed in ACI 350-01 Table 22.214.171.124. Increased area of reinforcement permits increased joint spacing. (Non-moving construction joints are not considered for these joint spacing limitations - I often provide the maximum steel percentage in the table and use large spacings for movement joints based on structure configuration.)
William C. Sherman, PE
CDM, Denver, CO
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