Published in the fall of , the ACI R publication includes new equipment and tactics, based on updated field experience and new technologies introduced since the edition. Because of the combustion by-products generated by direct fired heaters, they are not suitable for cold-weather concreting applications without first protecting the concrete. These items are not eligible for return.
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For a listing of and access to all product errata, visit the Errata page. No contractor wants to receive that dreaded call-back to inspect failing concrete poured during the winter.
The use of air heat requires construction of costly enclosures, which must be heated in addition to protecting the concrete. Guide to Cold Weather Concreting: Because of the combustion by-products generated by direct fired heaters, they are not suitable for cold-weather concreting applications avi first protecting the concrete.
The heaters come standard with a digital temperature controller and push-button adjustment for easy control over fluid output temperature. Sci line includes 6 models offering curing capacities from 2, to 30, ft2. Concrete placed during cold weather will develop sufficient strength and durability to satisfy intended service requirements when it is properly produced, placed, and protected.
R Guide to Cold Weather Concreting
Insulating blankets are used to direct heat 360r-10 into the concrete. On the back end, ACI R recommends that the heat from external heating sources be reduced gradually to ambient temperatures before removing the protection. The revised ACI R specification recommends that temperatures throughout the concrete remain as uniform as possible. This guide provides information for the contractor to select the best methods to satisfy the minimum cold weather concreting requirements.
For this first time, the latest spec lists hydronic heating systems as an approach to protect concrete during cold weather. Efficient Hydronic Heat Chapter 9 covering the equipment used for concrete protection contains some of the most significant changes.
Errata are not included for collections or sets of documents such as the ACI Collection. The full and complete returned product wci be accepted if returned within 60 days of receipt and in salable condition.
Several factors affect this time period, including ambient temperature, the type of concrete, size of the pour and how soon the ack will be exposed to load conditions. As anticipated load increases and concrete is exposed to freeze-thaw cycles, the protection period can be as many as 6 days. Guides to temperature uniformity, refined cold-weather concreting definitions and more clearly defined approaches to temperature protection are but a few of the updates found in the revised spec.
With regards to external heating sources, it more clearly defines combustion heaters by breaking them into direct fired and indirect fired types.
306R-10 Guide to Cold Weather Concreting
The 3306r-10 specification advises against extreme temperature swings when placing concrete in cold weather. The newly added hydronic heating method offers contractors a much more efficient and cost-effective solution for cold-weather concreting. This allows contractors to adjust heating temperatures throughout the curing process to avoid temperature extremes. Chapter 7—Protection against freezing and protection for concrete not requiring construction supports. Fresh concrete under no load and not exposed to freeze-thaw cycles will have a minimum protection period of 2 306r-01.
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Hydronic Heat Now in ACI Specification | Wacker Neuson
BTUs are not wasted heating enclosures and, therefore, hydronic systems deliver high BTUs at very low temperature differentials between the transfer hose and concrete. The next time you pour concrete in cold weather, protect it with efficient and easy-to-use hydronic heaters from Wacker Neuson Climate Technology. The materials, processes, quality control measures, and inspections described in this document should be tested, monitored, or performed as applicable only by individuals holding the appropriate ACI Certifications or equivalent.
These items are not eligible for return. Hydronic system heat transfer fluids are times denser than and offer more than 6 times sci specific heat of air.
These flexible heaters also thaw frozen ground and warm forms prior to concrete placement. The objectives of cold weather concreting practices are to prevent damage to concrete due to freezing at early ages, ensure that the concrete develops the required strength for safe removal of forms, maintain curing conditions that 306f-10 normal strength development, limit rapid temperature changes, and provide protection consistent with the intended serviceability of the structure.
Any applicable errata are included with 306r-1 documents at the time of purchase. Published in the fall ofthe ACI R publication includes new equipment and tactics, based on updated field experience and new technologies introduced since the edition.