ACI Certification Ch 7-Procedures for finishing slabs-on-ground questions with correct answers

Rigid supports for a straightedge used to stick off concrete can be: a. temporary pipes or rails b. edge forms c. the top of the edge of adjacent hardened concrete d. all of the above Answer d. all of the above How can workers avoid low spots when using hand operated straightedges? Answer Make sure there is always enough concrete ahead of the straightedge. Hand-held vibrating screeds are often useful when striking off concrete with ________ ________. Answer wet screeds true or false vibrating screeds should be moved forward as fast as proper consolidation allows to avoid bringing too much mortar to the surface. Answer true On slabs with many protruding pipes, a ________ works better than a ________ ________ for smoothing the surface. Answer darby ; bull float Bull floating is done: a. before screeding b. immediately after screeding