PLNI - Game Over Message Board

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Microcap & Penny Stocks : PLNI - Game Over

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To: tonto who wrote (5951)	8/14/2006 2:55:18 PM
From: rrm_bcnu	Read Replies (1) of 12518

So this analysis is flawed? Metal chairs and rebar supports do not make any difference as far as spalling once the concrete has set? Spalling: Surface concrete loss in pieces of various sizes is called spalling and is caused when expansive forces inside and near the surface of concrete act along a weak plane or create a weakened plane. The expansive force can be caused by the stress of corrosion of reinforcing steel or imbedded metal items. Corrosive oxidation (rust) causes expansion which in turn creates additional stress. Internal expansion can also be caused by moisture absorbed by porous aggregate that expands and contracts in thermal cycles. Moisture may be trapped inside the matrix of the concrete by paints or sealants that do not allow moisture to migrate and escape at the surface. Spalling can occur due to a condition called laitance where concrete, during placement, was mixed too wet and cement rich paste rises to the surface of the concrete thereby depriving other portions of the mix of cement-related cohesion and consolidation. nps.gov

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