Cns 220 Exam 2 Questions & Answers Solved 100% Correct!!

Steps to Quality Concrete - CORRECT ANSWER-1. proper mixing and proportions 2. proper transport and handling 45-90 minutes 3. proper placement 4. proper finishing 5. proper curing and protection ACI - CORRECT ANSWER-American Concrete Institute Finish Options of Concrete - CORRECT ANSWER-1. broom finish - exterior 2. smooth - hard travel interiors 3. stamped - brick looking 4. colored - exposed aggregate 5. acid finish What is curing for concrete? - CORRECT ANSWER-keeping moisture in as long as possible Types of Curing Concrete - CORRECT ANSWER-- chemical - visqueen (plastic film) laid on top - wet burlap - create dam and flood it Problems of Concrete - CORRECT ANSWER-- dusting: finishing too soon - crazing: by improper curing - chipping of concrete/scaling/flaking/spalling: too much surface water or too much air - cracking Control Joints - CORRECT ANSWER-cut the concrete (saw) Construction Joints - CORRECT ANSWER-pour concrete different days Types of Joints - CORRECT ANSWER-- hand tooled - sawn - inserts: metal in concrete Sidewalks - CORRECT ANSWER-cannot excede 1 and 1/2 width for the length Grade of Reinforcing Steel - CORRECT ANSWER-- 40 most residential - 60 most commercial - 75 special situations AISC - CORRECT ANSWER-American Institute of Steel ConstructionAdvantages of Steel - CORRECT ANSWER-1. lighter weight ratio compared to concrete masonry 2. uniformity of properties/performance 3. good in tension 4. good in compression 5. span long distances 6. easy to install with competent workers 7. good ductility 8. can be fire protected