SPECIFICATION CHECKLIST FOR COLD WEATHER CONCRETING
Paragraph nos. refer to ACI 306.1 "Standard Specification for Cold Weather Concreting"

Section 1 — General Requirements
1.4 Review applicability of the cited references and delete those not required.
1.5.1 Although it is not recommended practice to include language from a reference cited in the specs, Ithere may be instances where it might be good to include the submittal part of ACI 306.1, or a version of it to suit the job:
Detailed procedures for the production, transportation, placement, protection, curing and temperature monitoring of concrete during cold weather shall be submitted to the Architect/Engineer. The submittal shall include procedures to be implemented upon abrupt changes in weather conditions or equipment failures. Cold weather concreting shall not begin until these procedures have been accepted.

See ACI 306R "Cold Weather Concreting" for minimum procedures. The details should include but not be limited to:
a. procedures for protecting the subgrade from frost and the accumulation of ice or snow on reinforcement or forms prior to placement;
b. methods for temperature protection during placement;
c. types of covering, insulation, housing or heating to be provided;
d. curing methods to be used during and following the protection period;
e. use of strength accelerating admixtures;
f. methods for verification on in–place strength; and
g. procedures for measuring and recording concrete temperatures.

Section 2 — Materials and Construction

2.3.1 If the temperature of massive metallic embedments, such as heavy steel guide rails or channels and steel grate frames or ducts, is lower than 32°F, concrete cast around them will be damaged by freezing.

2.3.2.2 Determine the frequency for recording the temperature but not less than twice per 24–hr. period.

2.3.4.5 Any changes in the concrete mixture proportions for reducing the duration of the protection period to prevent freezing should be submitted for approval, review, or acceptance. The protection period against freezing may also be reduced if after 24 hr. it can be verified that the compressive strength of the in place concrete is at least 5000psi and the structure has no early strength requirements. The minimum protection temperature specified in Table 2.3.2.1 may be reduced provided the protection period is extended until the compressive strength of the in place concrete is at least 500 psi.

2.3.4.6 Indicate in the Specifications the concrete strength required each structural member before form removal or continued construction, or both. Approve the method selected for demonstrating strength development.

COLD-WEATHER CONCRETE NOTES #
courtesy of Design Coalition, Architects. , Madison, Wisconsin, USA ~~ www.designcoalition.org