A - Fresh Concrete 1. Define the following: - Workability - Consistency - Mobility - Compactability - Segregation - Bleeding 2- Why there is no direct test that could measure concrete workability? State the different tests used as a measure for concrete workability and the concrete mixes each test is suitable for. 3. Sketch the different slump shapes observed in a slump test and the concrete consistency for each 4- What are the different types of concrete segregation? State the adverse effect of segregation 5. How could we increase the concrete mixture resistance to segregation? How could you adjust very dry or very wet mixtures? 6. What is meant by yield of concrete mixtures? The mix proportions for 1 cubic meter of a concrete mix is as follows: Cement Sand Coarse Aggregate Wic 350 kg/m 720 kg/m3 1100 kg/m 0.58 The actual density of the freshly mixed concrete is 2410 kg/m3. Calculate the yield and the adjusted mix proportions 7. What are the disadvantages of prolonged mixing? 8- How can we judge the uniformity of mixing or the mixing efficiency of a mixer? 9. What is meant by re-tempering a concrete mixture? 10- How could you order ready mixed concrete? 11- State the ASTM C94 recommendations for truck mixed concrete. 12- State different methods used in transporting and handling concrete mixtures. 13- Why consolidation of concrete is important? State different methods to consolidate concrete 14- What are the requirements for adequate curing? List the different curing methods. State the ACI 309 minimum moist curing periods. 15- Sketch a typical atmospheric pressure steam curing cycle identifying the main steps and requirements for each step