Concrete Final Exam 2024 with complete solution;(Actual test questions and answers)

Concrete Final Exam 2024 with complete solution;(Actual test questions and answers) Prior to placing concrete for pavements or slabs on grade, what should be done? - Answer ️️ - Subgrade should be compacted, trimmed, and moistened; forms should be erected; and the reinforcing steel members should be securely in place. In hot weather, what is important to do to the subgrade? - Answer ️️ -It needs to be moistened to prevent the dry ground from sucking water out of the concrete. What is true about forms for concrete? - Answer ️️ -Wood forms should be moistened to prevent water loss from the concrete, all forms should be able to be removed from the concrete without damaging it. Steel should be clean and free of rust, steel forms can be below freezing when concrete is poured. How should concrete be deposited? - Answer ️️ -Continuously as near as possible to its final position. How do you deposit concrete on a slab pour? - Answer ️️ -It should be started along the perimeter at one end of the slab, the concrete should not be dumped in separate areas and spread out. How should concrete be placed in walls, thick slabs, or foundations? - Answer ️️ -In horizontal layers of uniform thickness, each layer should be consolidated before the next layer is added. How rapidly should concrete be placed when pouring in layers? - Answer ️️ -Fast enough to not let the previous layer set. How is concrete moved to lower elevations? - Answer ️️ -Chutes and drop chutes are used to prevent segregation of the concrete. How far can you drop concrete without segregation? - Answer ️️ -50 feet