Curing by Moisture Retention without Supplemental Heat TM-101 4.11 - 4th Edition

Описание: This video provides an overview of concrete curing methods that focus on moisture retention without the use of supplemental heat. It explains that concrete undergoing this curing process must be kept covered, warm, and moist until it achieves the specified compressive strength required for the transfer of prestress or stripping.

The video details several acceptable methods for achieving proper moisture retention. These include leaving the concrete element in its form, maintaining continuous moisture on the top surfaces through techniques such as fogging, spraying, or covering with wet mats. Alternatively, covering the top surface with an impermeable cover or a membrane curing compound is also an acceptable method. Furthermore, once the side forms are removed, all exposed concrete surfaces should be cured using these applicable moisture retention methods.

A key aspect highlighted is the use of moisture retention enclosures. The video emphasizes that these enclosures are crucial for ensuring that free water is present on concrete surfaces at all times during the curing period. It also states that these enclosures must be resistant to tearing and must be securely fastened in place to prevent displacement by wind or other factors throughout the curing cycle. They are required to remain in place until the curing process is fully complete.

The overview also covers the use of membrane curing compounds as a method to retain moisture within the concrete. When using these compounds, the video advises that they must be applied as soon as the sheen from surface bleed water disappears. It is essential that the compound is applied at the recommended coverage rate, ensuring that the entire exposed surface is uniformly covered with a film. The membrane curing compound must remain in place until the curing cycle is complete. Compatibility with any future coatings or other materials to be applied to the product in later construction stages is another critical consideration. The video warns that some curing compounds can act as bond breakers, potentially interfering with the adhesion of repairs or other surface coverings like paint, fabric, insulation materials, or protective coatings. Therefore, membrane curing compounds should generally not be used in areas where joint sealants or other required adhesive materials will be applied, unless they are entirely removed after the curing period. Finally, the video points out that membrane curing compounds should only be utilized on surfaces where any potential discoloration or staining will not result in an unsatisfactory final product. This comprehensive overview aims to provide clear guidance on effective moisture retention strategies for concrete curing without supplemental heat.