How Do I Fix Crumbling Mortar in Brick Columns?

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BRANO
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Q:

My house was built in 1900.  The porch deck and the portion of the house above it are supported by a column of bricks.  My problem is, the cement between the bricks is crumbling. The bricks are still in place, but I'm nervous that the columns aren't structurally sound.  Can I perhaps put a form around the columns, then fill a 2-inch or so space around the brick with new concrete?  Or should I support the structure, remove the bricks, dig below the frost line and do a Sonotube column?  Thanks for any advice.  I like your radio show. 

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