An Unbiased View of Prestressed Concrete
Steaming is mostly used for Southern Pine poles, nonetheless Douglas Fir poles addressed with waterborne preservatives also might be steamed. Douglas Fir is typically Boultonized, exactly where the retort is pressurized as well as the preservative is heated to 180 levels to 220 levels F.Concrete which has been hardened on to imbedded metallic (ordi