New Hampshire · answered by Verika · verified against sources
What are the rules for placing concrete in cold weather on New Hampshire DOT projects?
"3.7.4.4 Forms, reinforcing steel, existing concrete and all other materials which will be in contact with the fresh concrete shall be brought to a temperature of 50 ° F and all frost shall be removed within the limits of the foundation prior to placing concrete." [1] "3.7.4.6 Finishing shall be completed as rapidly as possible. On areas where Item 534.3 is not used, liquid curing compound shall be applied to exposed surfaces immediately after finishing. After the concrete has set, plastic shall be placed over the exposed areas. When insulation is used, a covering of approved insulation or a layer of hay and a tarpaulin shall be placed over the plastic and secured in place." [1] "3.11.1.1 Cold Weather. When the average daily temperature falls below 35 °F for more than 1 day, protective measures shall be taken to prevent damage to the concrete by freezing. The protective measures shall be included on the shop drawings as required." [3]
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