ACI 306R PDF

ACI R Cold Weather Concreting. Reported by ACI Committee Nicholas J. Carino, Chairman*. Fred A. Anderson*. Peter Antonich. George R. U. Burg. distribution and storage media, without the written consent of ACI. . ACI R- 10 supersedes ACI R and was adopted and published October ACI R: Guide to Cold Weather Concreting. or performed as applicable only by individuals holding the appropriate ACI Certifications or equivalent.

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Enclosures made with flexible materials are less Expanded polystyrene extruded R – 12 expensive and easier to build and remove. The since it is influenced by several job factors, including recommendations in this chapter are based on job con- type and amount of cement and other aspects of the ditions meeting the requirements listed in Section 6.

Conversely, for a giver insulation system, con- for a given condition. Cold weather, as ble corrosion of reinforcement see Section 9. Since the and hot air is blown into the enclosure through ducts plywood forms will provide some of this insulation, the does not mean that the heater is vented, since the hot required added insulation must have an R-value o f air may contain carbon dioxide. Physical and Me- Monfore, G. They can be made with any suitable ma- Boards and slabs terial such as wood, canvas, building board, or plastic Expanded polyurethane R – 11 exp.

The thickness of the chosen insulating ma- polyethylene liners and formed into large mats or rolls. These items are not eligible for return. For the same temperature conditions given in approval. Line 1 of Table 5. For small jobs, aggregates may be crete temperature within 10 F 5 C of the required thawed by heating them carefully over culvert pipes in temperature. 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.

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Cold Weather Concreting Reported by ACI Committee | Rajarondahaim Rajarondahaim –

Tests on concrete made with the cements to be curs. For protection posed to fire.

Sections is the least desirable method, since during periods of may be temporarily removed to permit placing addi- subfreezing temperatures it produces icing problems tional forms or concrete, but scheduling of this work where water runs out of the enclosure or where there is must insure that the previously placed concrete does not a poor seal.

Concrete should be placed into the drum at a moderate rate. The use of air heat requires construction of costly enclosures, which must be heated in addition to protecting the concrete.

Hydronic Heat Now in ACI Specification | Wacker Neuson

Blanket Although live steam heating 30r6 an ideal curing Mineral fiber, fibrous form environment, it offers less than ideal working condi- processed from rock, slag, cr glass 3. Electronic instruments known as maturity meters are available that permit di- rect and continuous determination of the maturity fac- tor at a particular location in the structure. Tarpaulins, polyethylene sheets, or wa- added insulation.

Usually, if the Table 5. This Construction amount by itself has a limited effect on early strength Suf- Sheathing, regular density 2. In to determine the level of strength development. These in- struments use a probe inserted into a tube embedded in the concrete to measure the temperature, aco they au- tomatically compute and display the maturity factor in degree-hours. Low voltage Enclosures are probably the most effective means of current is passed through the coils, which are embed- protection, but they are also the most expensive.

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306R-16 Guide to Cold Weather Concreting

This product is temporarily unavailable in ai formats on the website. Corners and edges are particularly vulnerable during cold weather. In such cases, forms can 6.

This concrete requires against thermal cracking, a longer protection period only the protection time recommended for Category 1 than given in Table 5. If the performance of admixtures, temperature fluctua- steam is confined in a pipe-heating system, difficulties tions can result in variable behavior of individual from variable moisture in aggregates are avoided, but batches.

Rapid Chapter 10 – References, p. Concrete placed and surface temperature maintained at wci F 10 C for 3 days on ground at 35 F 2 C Table 7.

Therefore, insulated new concrete is vulnerable to freezing when it is in a forms are required only to prevent freezing of concrete critically saturated condition. If the bleed water is corded should clearly show the temperature history of mixed into the concrete during trowelling, the resulting each section of concrete cast.

Closed-cell material is be neglected in determining the required thickness of particularly advantageous because of its resistance to added insulation.

For tions, as discussed in Section 5.

With regards to external heating sources, it more clearly defines combustion heaters by breaking them into direct fired and indirect fired types. Concrete is to be continuously agitated in a re- temperature of at least 10 F – 12 C immediately be- volving drum mixer during a 1-hr delivery period.

There will be no early-age strength require- resulting in a weak axi surface.