Precast Concrete Design & Detailing - StruEngineers - Truths

These connections can likewise enable for thermal growth and contraction of the structure or members. They can be created to yield, or offer, allowing the concrete tension relief, preventing splitting! Precast parts connected at their joints can create construction that either is monolithic at the important joint or supplies connections permit the precast components to act monolithically.

Type of Joints Figure 3: Single Phase Joint There are 3 basic precast wall system joint types: one-stage, two phase, and growth joints. The one-stage (face sealed) joint has a single line of caulking for weatherproofing.  Reference  is usually in the form of a gun-applied sealant near to the outside surface of the precast member.

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Water tightness of sealant joints can be enhanced by installing a 2nd line of sealant in each joint, the two-stage joint. This layer supplies redundancy in the system, as it is fully protected from weather condition and UV direct exposure by the external layer of the sealant. This technique might require the installation of weep openings in the exterior seal to enable water contained by the inner seal to leave the cavity in between joint seals.

Rules for Designing Contraction Joints - For Construction Pros - Questions

Failure to supply these weep openings may result in trapped water within the joint and ponding versus both seals. This speeds up wear and tear of the sealant product and its bond to the substrate. Figure 4 reveals two stage vertical joints. Figure 4: Two Stage Vertical Joint Growth joints are positioned in structures to restrict the magnitude of forces, which arise from volume-change contortions (temperature modifications, shrinkage, and creep), and to allow motions (volume change and seismic) of precast components.

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Box Culvert Standard Joint Detail - Columbia Precast Products

For growth joints to be effective, they are needed to be watertight, provide a full variety of motion, enhance the resilience of the deck or structure, and be low maintenance. They may be specifically required for non-rectangular structures and must be located at locations where the strategy or elevation measurements alter drastically.

The width of an expansion joints depends upon lots of variables like building sizes and shape, member sizes and shapes, as well as the spacing and number of multiple expansion joints that may be required. Expansion joints should accommodate both vertical and horizontal motions. Typical expansion joint sizes can vary from 2" to 12" relying on its usage, a might be required in building footprints from 250' to 350' or larger.