ACI Strength Exam Study Guide Questions with Certified Solutions

ACI Strength Exam Study Guide Questions with Certified Solutions Name the two allowable materials with with concrete cylinders may be capped with. I. High- strength gypsum II. Sulfur mortar III. Neat cement paste Name the three materials with with cylinders may be capped against. I. Glass II. Metal III. Granite Prior to beginning the capping procedure, what must the metal plate be inspected for? I. Grooves II. Gouches III. Indentations What is the maximum allowable size of any indentation on the base plate? 0.010 in [0.25 mm] Upon receipt of the caping material, for how long can it be kept in intervals? 3 months When must the neat cement paste be applied it to the cylinder? Immediately For how long must the concrete settle in the mold prior to applying the neat cement paste? 2 to 4 hours Prior to capping, name the three tasks that must be performed on the cylinder. I. Inspect for any bumps greater than 1/8" II. Remove foreign debris. III. Remove any excess water or laitence. What is the required position of the concrete cylinder? 90° ± 0.5° Name the required temperature range of the heated sulfar mortar mixture. 265°F to 290 °F [130 °C to 145 °C] What is the maximum number of times that the heated sulfur may be used per cylinder capping procedure? 5 times These procedures for capping enable concrete cylinders and cores to meet the standard practice's requirements for _____ and _____. perpendicularity ... planeness ... perpendicularity Equipment needed for the capping process includes capping ____ ____ devices and _____ pots. plates ... alignment ... melting Plates for neat cement and high-strength gypsum plaster caps should be made of ____, _____, or _____. metal ... glass .... granite Sulfar mortar cap plates should be formed against _____ or _____ plates. marble ... stone True or false? The purpose of the guide bar or bull's eye level is to ensure that caps remain perpendicular to the axi of the cylinder within 0.5 degrees. True To avoid accidents during reheating of cooled sulfur, use melting pots that have _____. Metal covers The technician should use a stiff layer of _____ to cap fresh concrete cylinders. Burlap Hardened concrete cylinders should be capped with ________, ______, or _______. cement paste ... gypsum .... mortar sulfur