UNIVERSITY OF CALIFORNIA AT BERKELEY CEE SPRING SEMESTER, 2002 Instructor: P.J. M. Monteiro Name:_____________________ CE 165 - EXAMINATION Please justify your answer in all the questions Question 1(20 points) I) Define hydraulic cement and give one example of a non-hydraulic cement. II) Give two advantages and two disadvantages of having cements with high C3A content. III) In the older times the cement raw materials were transported by water (“wet-process”). Explain why this method is not used anymore. IV) What are the advantages and disadvantages of using calcium aluminate cements?Question 2 (15 points) a) As a contractor, you have to cast an air-entrained concrete slab. Should you use cement Type IA or cement Type I and an air-entraining admixture. Explain your reason. b) What are cements Type I-P and I-S? c) You are a contractor who does not want to use fly-ash in your concrete. Write a short technical memo justifying your reasons.Question 3 (15 points) I) Do the cement particles become hydrophilic or hydrophobic when air-entraining agents are used? Describe the following finishing operations: II) III)Question 4 (20 points) I) Explain why some salts can act as a retarder when used in small dosages and as an accelerator when used in large amounts. II) Water-reducing admixtures can lower the cement content and increase the consistency and strength of a reference concrete mixture. Explain why all three benefits may not be available at the same time. III) If you add more water to a fresh concrete can you significantly increase (a) the slump, and (b) the slump loss? IV) What is the difference between false and flash set?Question 5 (14 points) I) List four causes of bleeding and segregation. II) Explain how warping develops in concrete pavements. III) List the advantages and potential problems of using chutes to transport concrete.Question 6 (18 points) I) Can you use municipal waste as aggregate for concrete? Explain your reason. II) List four potential problems of using recycled aggregate. III) Explain what is the bulking caused by moisture to the fine
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