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This preservative is also used for remedial treatments to in-service poles including internal/external surfaces at ground or below ground level via brush/trowel, mechanical injection, or bandage wrap. Wood treated with copper naphthenate is specified for exterior above ground, ground contact, below ground and fresh water contact use applications.
Copper azole treated wood is marketed widely under the Preserve CA and Wolmanized brands in North America, and the Tanalith brand across Europe and other international markets. The AWPA standard retention for CA-B is 0.10 lb/cu ft (1.6 kg/m 3) for above ground applications and 0.21 lb/cu ft (3.4 kg/m 3) for ground contact applications. Type C ...
Copper and lead cannot be used in contact with or even above aluminium, zinc, or coated steel without an increased risk of premature corrosion. Also, aluminium and zinc flashing cannot be used in contact with pressure treated wood due to rapid corrosion. Aluminium is also damaged by wet mortar and wet plaster.
The copper in ACQ treated wood accelerates corrosion of galvanized steel fasteners (such as nails and screws) 10 times or more in comparison with CCA-treated wood. Stainless steel (AISI 316) is not affected. [7] Aluminium and Galvalum fasteners should be avoided. [8] One should use fasteners made of hot-dipped galvanized steel, copper, or ...
This process is similar to the Les Bois Perdure treatment in that it uses a steam environment at atmospheric pressure to treat the wood. However, this process can also be used on "green" wood and was the most widely used commercial process as of 2004. [5] [10] Genuine industrial scale ThermoWood process was developed in Finland in 1990's.
Non-pressure methods are the application of preservatives by brushing, spraying, or dipping the piece to be treated. Deeper, more thorough penetration is achieved by driving the preservative into the wood cells with pressure. Various combinations of pressure and vacuum are used to force adequate levels of chemical into the wood.
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The bearing capacity of soil is the maximum average contact pressure between the foundation and the soil which should not produce shear failure in the soil. Ultimate bearing capacity is the theoretical maximum pressure which can be supported without failure; allowable bearing capacity is the ultimate bearing capacity divided by a factor of safety.
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