Mix Chapter gives concrete contractors, estimators and chapter members a free concrete takeoff from their own plans. Send a vector PDF, DWG or DXF plan set and get concrete by element, rebar, and block and grout counts back, each shown on your drawing, plus a material cost estimate (an estimate, not a bid). Most takeoffs are ready within a few hours. Also offers free ACI practice exams in English and Spanish. Not affiliated with the American Concrete Institute (ACI).