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Aci 303R 12 Guide To Cast In Place Architectural Concrete Practice 2012
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- American Concrete Institute Announces New Structural Concrete Specifications.
- Aci 303R 12 Guide To Cast In Place Architectural Concrete Practice 2012!
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American Concrete Institute Announces New Structural Concrete Specifications : Concrete Facts
Ask for rush delivery. Most backordered items can be rushed in from the publisher in as little as 24 hours. Some rush fees may apply. Add to Cart. Use the thinnest application that still provides the release function. Honeycombing is described as an area where greater than half of the coarse aggregate surface area is exposed and is not surrounded by mortar. Honeycombing is also linked to poor consolidation practices. However, poor concrete placement procedures, incorrect mixture proportions, or congested rebar sections can contribute to the phenomenon.
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Besides causing a poor concrete aesthetic, honeycombing can also pose a service risk due to reduced concrete strength, structural function and possible durability concerns. It is important to identify honeycombing characteristics, a repair remedy when appropriate and guidelines for when a repair remedy is not appropriate.
Shallow surface cracking typically does not appear readily along the formed surfaces of ordinary or SCC concrete.
If this occurs in a precast product, it is typically on the unformed exposed surface of the product, which will be discussed in more detail in the next article. Fins occur when fresh concrete squeezes out of ill-fitting form joints.
American Concrete Institute
Forms need to be modified to improve tolerances to eliminate fins. In some cases, concrete fins within the bell or spigot area can interfere with a good joint connection and fins can come off during truck transit. Concrete form bleed occurs with ill-fitting forms that have a gap at the pallet interface, jacket or core connections. This allows the concrete mix, primarily paste, to leak out.
The result is an excess amount of cement slurry on the production floor and a bleed out section on the product.
This area has an appearance similar to honeycombing in that it has exposed aggregate with missing cement paste. Typically, this occurs at the bottom of the form where the mix has been dropped through the form opening. Many form bleed areas, depending on the affected size and depth, will require some approved patching remedy. The long-term remedy is to seal the leaking areas prior to casting or correct the gap tolerance with maintenance on the problematic form parts.
Forms must be checked for dimensional tolerance prior to initial use, annually thereafter and each time the form is prepared for casting. A sand streak propagates with water along the form wall, removing the cement paste and small fine aggregate and leaving behind elongated veins of exposed aggregate without cementitious paste.
Layering marks are a visual anomaly showing where one concrete pour was cast on another and two batches have combined. Typically, these marks will dissipate with a consistent deep vibration technique to better blend the two pours along the form wall. If there is no issue regarding the visual effect and an explanation is needed for interested parties that the imperfection is not a cold joint, a layering mark provides no ill effects to the precast concrete product.
Similar to a layering mark, a cold joint is where two separate concrete batches are poured to complete a casting for a concrete component. However, unlike a layering mark, the two concrete batches have not become homogeneous. Typically, there is some delay in casting the second lift of concrete atop the first.
Consequently, the first section has had time to initiate its initial set. This can be very problematic for several reasons. A product with unanticipated cold joints is an indicator of poor production practices.