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Posts and poles can be treated directly on endangered areas, but should be treated at least 30 cm (0.98 ft) above the future ground level. The depth obtained during regular steeping periods varies from 5 to 10 mm (0.20 to 0.39 in) up to 30 mm (1.2 in) by sap pine.
The mixture is infused into wood at high pressure. [ 4 ] In the treated wood, arsenic is believed to be in the form of chromium (III) arsenate CrAsO 4 and/or copper(II) arsenate Cu 3 (AsO 4 ) 2 , or fairly stable chromium dimer-arsenic clusters.
Forces on post-tensioned concrete with profiled (curved) tendon Post-tensioned tendon anchorage; four-piece "lock-off" wedges are visible holding each strand. Post-tensioned concrete is a variant of prestressed concrete where the tendons are tensioned after the surrounding concrete structure has been cast. [1]: 25
post only vs. with additional single-circle ring [15] In a classic case one of the best designs for a post to decrease the risk of failure is the narrowest and longest smooth, parallel post that one can fit into the post space. Utilizing the longest possible post ensures that the forces transmitted from the crown are distributed over as much of ...