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aggregate alumina cement concrete Androscoggin River boiler bottom bridge building caissons calcium chloride camp canvas cent chute cofferdam cold weather cold-weather Construction Company contractor cost covered crete curtains cylinder direct winter expenses enclosure engineer equipment excavation exterior column falsework fire forms frost crust frozen ground Gatineau River grill Gulf Island hardening hauling hazard heated by steam heaters holes housing insulation keep labor live steam loads lubrication materials methods mixing water motor pavement pier pipe line 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 tarpaulin temperature thawing thermometer tion Toltec torch tractor trench truck Turner Construction walls warm winter concreting winter construction wood York zero