ACI Concrete Strength Technician Questions and Answers Already Passed

ACI Concrete Strength Technician Questions and Answers Already Passed What is ASTM C1231? Standard Practice for use of Unbonded Caps in determination of compressive strength of hardened cylindrical concrete specimens (C1231) The height (cavity) of the metal retaining ring must be (25 +/- 3mm) (C1231) If the retaining ring is greater than 4in (100mm) it must be at least __ thick. If it is less than 4in, it must be at least __ thick. .47 in (12mm) and .35in (9mm) (C1231) Bearing surfaces of the retaining ring must not have gauges greater than .01 inches (.25mm) deep or .05in (32mm) surface area (C1231) For specimen ends, depressions under a straightedge must not exceed .2 inches (5mm) measured across any diameter using a round wire edge (C1231) Depressions on ends of specimens that exceed ___ must be corrected by sawing or grinding .2in (5mm) Procedures for capping enable concrete cylinders and cores to meet C617's practice requirements for___ and___. perpendicularity and planeness Capping plates can be made of what material? (C617) glass, machined metal, polished granite, or diabase (c1231) The inside diameter of the retaining rings shall not be less than _____% or greater than _____% of the diameter of the cylinder. 102% and 107% (c1231) Pad thickness must be (13 +/- 2mm) (C1231) The diameter of the pad shall not be more than __ smaller than the inside diameter of the retaining ring 1/16 in (2mm) (C1231) Neither end of the cylinder shall depart from perpendicularity by more than __ degrees .5 (C1231) Depressions on ends of specimens that exceed .2in (5mm) must be corrected by ___ or ___ sawing or grinding (C1231) Tolerance on Shore A durometer hardness is +/- __ +/- 5 (C1231) The surface of the base plate that contacts the bearing block must be plane to within ___ in. .002 in (.05mm) Unbonded caps can be used for ASTM C__, C___, and C___ C31, C192, and C42 After application of the load, but before reaching 10% of the anticipated specimen strength, check to see that the axis of the cylinder does not depart from vertical by more than _____ degrees. .5 degrees Qualification tests on an unbonded capping system must be repeated when ever there are changes in _____ (3) -The design or dimensions of the retaining rings -Pad composition or thickness -The Shore A hardness by more than 5 units After application of the load, but before reaching _____ of the anticipated specimen strength, check to see that the axis of the cylinder does not depart from vertical by more than .5 degrees 10% What is ASTM C617 Standard Practice for Capping Cylindrical Concrete Specimens What is ASTM C78 Standard test method for Flexural strength of concrete (C78) When measuring the width and