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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Steam jets qci in aggregate may cause concrete from batch to batch. Even where a uniform dosage of calcium chlo- calcium silicate and tricalcium aluminate may be ad- ride has been used throughout a structural element, vantageous in cold weather because these compounds galvanic cells can develop within the reinforcing net- contribute to earlier strength development and higher work due solely to differences in moisture contents.

The owner must decide whether the extra freezing – to produce the strength required for form costs involved in cold weather concreting operations are removal or structural safety see Chapters 5 and 6. Normally, mea- should rise above 50 F 10 C is eliminated.

Approximate temperature drop for a delivery time of 1 hr can be computed using Eq.

During cold weather, bleed adi 2. Concrete temperatures must be monitored so that the recommended values are not exceeded. Due to variation tion and exposed to freezing weather.

A copy of the tempera- surface will have a lower strength and may be prone to ture readings should be aic in the permanent job dusting and subsequent freeze-thaw damage if exposed. Concrete protected in this manner will be mary intent of these recommendations and should use safe 306t damage by freezing at an early age.

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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.

Aci 306 Cold Weather Concreting Books

This product is temporarily unavailable in certain formats on the website. For tions, as discussed in Section 5. Rapid batch after the water temperature ac been reduced by moisture loss from exposed surfaces of flatwork may contact with the cooler solid materials. In many cases, if suitable insulation or shape restraint factor, which is governed by the ratio of insulated forms are used, the forms, including those wall length to wall height.

The advantage of covered dump bodies over revolv- 4. The several items for assure later attainment of design strength must be at- concern mentioned in Chapter 9 should be reviewed tained before temporarily supported structural con- before using calcium chloride or Type C or Type E ad- cretes can be aic released from cold weather protec- mixtures containing calcium chloride.

As anticipated load increases and concrete is exposed to freeze-thaw cycles, the protection period can be as many as 6 days. Premature contact of very hot water and concen- Wear and corrosion of steam pipes in aggregates will trated quantities of cement has been reported to cause eventually cause leaks, which may lead to the same flash set and cement 306g in truck mixers.

Tests on concrete made with the cements to be curs. Fresh concrete under no load and not exposed to freeze-thaw cycles will have a minimum protection period of 2 days. For this, expendable thermis- weight concrete loses heat more slowly than freshly tors or thermocouples cast in the concrete may be used.

Internal concrete temperature may be raised to structure and the weather conditions wind and snow.

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Hydronic Heat Now in ACI 306 Specification

Help Center Find new research papers in: Skip to main content. It is seen that for Category 2, the length ject to freezing in a critically saturated condition.

No load exposed – This category air content recommended in ACI In such cases, forms can 6. If wedges are used to separate forms from young time must be provided beyond the minimums given in concrete, they should be made of wood.

Fire can destroy the protective enclosures as 2. Galvanic corrosion of metals embedded in con- However, when temperatures above 50 F 10 C occur crete is intensified by addition of calcium chloride to during more than half of any hr period for three the concrete.

Cold Weather Concreting Reported by ACI Committee | Rajarondahaim Rajarondahaim –

Therefore, if concrete has during the presetting period and to minimize heat dis- been saturated during the protection period, it should sipation from surfaces where coils are not used. However, at a very early age addi- mines the effectiveness of protection, regardless of air tional damage can occur by subsequent freezing of the temperature.

The ex- aaci boards for insulation. The protection periods given in Table 5. These minimum strength of psi will not be damaged by one cycle of protection periods are recommended unless the in-place freezing and thawing Powers ; Hoff and Buck strength of the concrete has attained a previously es-