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Message: <blockquote data-quote="TriHonu" data-source="post: 30122" data-attributes="member: 897">Blocks with rebar can be really tough. I would start on a corner and try to break pieces off by angling the bit from the top toward one of the sides.  Don't try to break too much at a time.  Concrete is strong in compression.  Pounding straight down on the top probably won't get a lot done in a hurry.  Tracks won't be of much help, but won't hurt you either.  You are supposed to have the special Lexan door on your loader when using a breaker.  Pieces of broken concrete can shoot off at high velocity.  You need more than a good pair of safety glasses, especially if the bit is up on a pier.  Keep the bit in contact with the cement and don't "dry fire" it without the bit firmly pressed on the target.There is another way to break up piers.  Check out <a href="http://www.dexpan.com/nonexplosivesblastingdemolition/product_dexpandemolitionagent.html" target="_blank">Dexpan </a>.  It is a product that when mixed with water expands and can create up to 18000 lbs of force.  You drill holes in the pier, pour in Dexpan and wait.  See page 4 in their <a href="http://www.dexpan.com/nonexplosivesblastingdemolition/dexpanpdfmanuals/DEXPAN_Catalog_English.pdf" target="_blank">Product Brochure</a> for an example of a post foundation demolition.</blockquote>