ACI 306R-10 defines cold weather as: “Cold weather exists when the air tempera-ture has fallen to, or is expected to fall below 40°F (4°C) during the protection period. The protection period is defined as the time required to prevent concrete from being affected by exposure to cold weather.” Concrete placed during cold weather will
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A. Cold-Weather Shotcreting: Protect shotcrete work from physical damage or reduced strength caused by frost, freezing, or low temperatures according to ACI 306.1 and as follows: 1. Discontinue shotcreting when ambient temperature is 40 deg. F and falling. Uniformly heat water and
Shotcrete Repair in Sea Water in Cold Climate| Concrete ...
We are considering shotcrete for repair of a badly deteriorated dock face exposed to salt tidal waters in a cold climate where freeze-thaw is a major consideration. We are interested in shotcreting because it can be done much more easily and economically than alternative methods.
Protecting Shotcrete from Freezing| Concrete Construction ...
A.: Although shotcrete typically has a higher heat of hydration because of its higher cement content, the fact that it is placed in thin layers usually offsets the heat of hydration benefits in cold weather. Therefore, protection requirements for shotcrete in cold weather are generally the same as those for normal concrete. According to ACI 506, "Guide to Shotcrete," a minimum strength of 500 psi is required to protect shotcrete from freezing the same as that required for normal concrete.
Cold joints in shotcrete walls are similar to cold joints in formed walls. Depending on the designer’s requirements, a key may be required at cold joint locations. Similar to formed walls, exposed reinforcing steel that is not being cast in concrete must be kept clean or cleaned following concrete placement. 7.
506.2-95 Specification for Shotcrete - World Archi
3.9—Hot weather shotcreting 3.10—Cold weather shotcreting 3.11—Protection 3.12—Tolerances Specification for Shotcrete (ACI 506.2-95) Reported by ACI Committee 506 Steven H. Gebl er Chairman Lars Balck, Jr. Secretary Jon B. Ardahl Bruce K. Langson Ernest K. Schrader Seymour A. Bortz Albert Litvin Vern Schultheis
Finding the Cure | Professional Watershaping | Watershapes
Proper protection of freshly placed concrete must occur during cold-weather shotcreting as well as hot-weather shotcreting and is paramount to providing quality control and assurance. The American Concrete Institute’s Specification for Shotcrete (ACI 506.2-95) is clear on this point: “Cure immediately after finishing,” it says.
e. Method of ensuring cold weather protection measures are maintained and effective when work requiring adjustment to the protective measure is being performed. 931.04.05 Hot Weather Shotcreting One (1) week prior to the application of shotcrete in hot weather, a description of the method to be used in the
Be Sure to Cure a Shotcrete Pool| Concrete Construction Magazine
To ensure that all that hard work isn't wasted, pool builders should pay close attention to two steps that are sometimes overlooked--curing and, during hot or cold weather, protecting the shotcrete. CURING METHODS Section 3.8 of the American Concrete Institute's "Specification for Shotcrete" (ACI 506.2-95) gives curing requirements that are ...
2.Before proceeding with additional shotcrete work, thoroughly clean joint and adjacent shotcrete, then wet and scour surfaces with air jet. G.Warm Weather Application: Prevent dryout resulting in cracking and separation by keeping surfaces continuously moist and/or covered with continuously moistened burlap for 7 days after shotcreting.