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The Slow Season Winter is the most difficult time for construction. It is cold, and sometimes there is snow and ice. The ground can freeze. When the ground is frozen, it is very hard to dig. Snow can cover the site and stop work. Ice is dangerous for workers to walk on. Concrete is difficult to pour in winter because it can freeze before it gets hard. If concrete freezes, it becomes weak. Sometimes work stops completely for weeks. Workers use heaters and special covers to protect materials from