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aggregate boiler bottom bridge building built caissons calcium chloride camp canvas cent chute cofferdam cold weather cold-weather Construction Company contractor cost covered crete curtains cylinder enclosure engineer equipment excavation exterior column falsework fire forms frost crust frozen ground Gatineau River grill Gulf Island handling hardening hauling hazard heated by steam heaters holes housing insulation keep labor live steam loads lubrication materials methods motor overground pavement pier pipe line placed concrete plant portland cement poured practice prevent freezing protection pump Quebec railway records removed road roof Saguenay River salamanders sand shelter shovel shown by Fig snow space steam jets steam pipe steam shovel steel stoves structure subgrade summer supply surface tank tar paper tarpaulin temperature thawing thermometer tion Toltec torch tractor trench truck Turner Construction walls warm winter concreting winter construction winter operations wood York zero