ACI - Concrete Strength Technician Training Exam Questions with 100% Correct Answers | Verified & Updated 2024

ACI - Concrete Strength Technician Training Exam Questions with 100% Correct Answers | Verified & Updated 2024 Standard Practice for Capping Cylindrical Concrete Specimens - Answer ️️ -ASTM C617 Procedures for capping enable concrete cylinders and cores to meet C617's practice requirements for___ and___. - Answer ️️ -Perpendicularity, Planeness ___ can be made of glass, machined metal, polished granite, or diabase. (C617) - Answer ️️ - Capping plates Sulfur caps can be formed against ___ or___ plates. - Answer ️️ -Metal, stone The working surface of a capping plate shall not depart from plane by more than___ mm. - Answer ️️ -0.05 Device used in conjunction with a capping plate to ensure perpendicularity. - Answer ️️ - Alignment device Perpendicularity requirement of the axis of a cylindrical specimen. (degrees) - Answer ️️ -0.5 The element of a melting pot that ensures against accidents during reheating of cooled sulfur. - Answer ️️ -Peripheral Heating Temperature of the sulfur mortar pot/materials. - Answer ️️ -265-290 F Capping material to be used on freshly molded cylinders. - Answer ️️ -Neat Portland Cement paste Remove this from the end of cylinders before capping. - Answer ️️ -Oily or Waxy materials Materials that can be used to cap hardened cement concrete cylinders. - Answer ️️ -Neat Portland Cement, Gypsum Cement, Sulfur T/F Plaster of paris is an example of a high-strength plaster - Answer ️️ -False Sulfur and gypsum cubes much show this compressive strength or the cylinder strength, whichever is greater. - Answer ️️ -5000 psi Strength of the paste depends on___, ___, and___. - Answer ️️ -Water cement ratio, time, type of cement These are avoided when a slight twisting motion is applied while capping. - Answer ️️ -Air voids and excess paste Sulfur material should not be used more than ___ times. - Answer ️️ -5 T/F When capping concrete cylinders with a compressive strength of 5000 psi or greater, it is permitted to reuse compound recovered from the capping operation of old caps. - Answer ️️ - False Sulfur mortar should be kept away from this while heating. - Answer ️️ -Water Sulfur mortar should be kept under a ___ with an___ for venting. - Answer ️️ -Hood, exhaust Standard Practice for use of unbonded caps in determination of compressive strength of hardened concrete cylinders. - Answer ️️ -ASTM C1231 Thickness of pads (C1231) in Inches - Answer ️️ -1/2 Durometer used in C1231 with a tolerance of +/-5. - Answer ️️ -Shore A Type of pad with classifications in C1231. - Answer ️️ -Neoprene Height of the retaining ring used in unbonded capping. in inches - Answer ️️ -1 The inside diameter of the retaining ring shall be within ___ of the diameter of the cylinder. - Answer ️️ -102-107% Thickness of the retaining ring for 6 in and 4 in specimens respectively. - Answer ️️ -12 mm, 9 mm The bearing surfaces shall not have gouges or grooves greater than this depth. (mm) - Answer ️️ -0.25 Cylinders should be made in accordance with one of these procedures. - Answer ️️ -C31 or C192 Depressions in the concrete cylinder shall not exceed___in., with grinding, sawing or capping being the correction. - Answer ️️ -0.20 When tests are made to establish a permissible number of reuses, the tests within ___ of the highest strength level will be included in the reuse count. - Answer ️️ -2000 psi Qualification tests of unbonded caps are to be performed by___. - Answer ️️ -Supplier/tester T/F C1231 establishes a maximum number of pad reuses that may not be exceeded under any circumstances. - Answer ️️ -False Psi range in which unbonded caps can be used. - Answer ️️ -1500-12,00